Changed display

.gitignore

@@ -14,6 +14,7 @@ bin/
 # Gradle
 .gradle
 **/build/
+**/out/
 !eco-api/src/**/build/
 .gradletasknamecache
 !gradle-wrapper.jar

README.md

@@ -99,7 +99,7 @@ Here's a list of some (not all) of the features of eco:
     - ArmorEquipEvent
     - EntityDeathByEntityEvent
     - NaturalExpGainEvent
-- Plugin extensions (Plugins for plugins)
+- Plugin extensions (com.willfp.eco.internal.Plugins for plugins)
 - GUI System
 - Integration system for external plugins
     - Anticheat support

build.gradle

@@ -7,7 +7,11 @@ plugins {
 
 dependencies {
     implementation project(":eco-api")
-    implementation project(":eco-core").getSubprojects()
+    implementation project(":eco-core:core-plugin")
+    implementation project(":eco-core:core-proxy")
+    implementation project(":eco-core:core-backend")
+    implementation project(":eco-core:core-nms:v1_16_R3")
+    implementation project(path: ":eco-core:core-nms:v1_17_R1", configuration: 'mapped')
 }
 
 allprojects {
@@ -57,6 +61,10 @@ allprojects {
         annotationProcessor 'org.projectlombok:lombok:1.18.20'
         testCompileOnly 'org.projectlombok:lombok:1.18.20'
         testAnnotationProcessor 'org.projectlombok:lombok:1.18.20'
+
+        // Test
+        testImplementation 'org.junit.jupiter:junit-jupiter-api:5.3.1'
+        testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.3.1'
     }
 
     tasks.withType(JavaCompile) {
@@ -75,7 +83,7 @@ allprojects {
     }
 
     shadowJar {
-        relocate('org.bstats.bukkit', 'com.willfp.eco.shaded.bstats')
+        relocate('org.bstats', 'com.willfp.eco.shaded.bstats')
     }
 
     jar {
@@ -92,6 +100,18 @@ allprojects {
         withSourcesJar()
     }
 
+    test {
+        useJUnitPlatform()
+
+        // Always run tests, even when nothing changed.
+        dependsOn cleanTest
+
+        // Show test results.
+        testLogging {
+            events "passed", "skipped", "failed"
+        }
+    }
+
     compileJava.options.encoding = 'UTF-8'
     compileJava.dependsOn clean
 

config/checkstyle/checkstyle.xml

@@ -45,7 +45,7 @@
     -->
     <property name="severity" value="error"/>
 
-    <property name="fileExtensions" value="java, properties, xml"/>
+    <property name="fileExtensions" value="java, properties, xml, kt"/>
 
     <!-- Excludes all 'module-info.java' files              -->
     <!-- See https://checkstyle.org/config_filefilters.html -->
@@ -66,6 +66,7 @@
     <module name="FileLength"/>
     <module name="LineLength">
         <property name="fileExtensions" value="java"/>
+        <property name="fileExtensions" value="kt"/>
         <property name="max" value="200"/>
     </module>
 

eco-api/build.gradle

@@ -8,17 +8,16 @@ version rootProject.version
 dependencies {
     compileOnly 'org.spigotmc:spigot-api:1.17-R0.1-SNAPSHOT'
     compileOnly 'org.apache.maven:maven-artifact:3.0.3'
-    compileOnly 'org.bstats:bstats-bukkit:1.7'
     compileOnly 'com.comphenix.protocol:ProtocolLib:4.6.0-SNAPSHOT'
     compileOnly 'com.google.code.gson:gson:2.8.7'
+    compileOnly 'net.kyori:adventure-text-serializer-gson:4.8.1'
+    compileOnly 'net.kyori:adventure-text-serializer-legacy:4.8.1'
 }
 
 java {
     withJavadocJar()
 }
 
-compileJava.options.encoding = 'UTF-8'
-compileJava.dependsOn clean
 
 build.dependsOn publishToMavenLocal
 

eco-api/src/main/java/com/willfp/eco/core/EcoPlugin.java

@@ -20,7 +20,6 @@ import com.willfp.eco.core.web.UpdateChecker;
 import lombok.Getter;
 import org.apache.commons.lang.Validate;
 import org.apache.maven.artifact.versioning.DefaultArtifactVersion;
-import org.bstats.bukkit.Metrics;
 import org.bukkit.Bukkit;
 import org.bukkit.configuration.file.FileConfiguration;
 import org.bukkit.event.Listener;
@@ -348,7 +347,7 @@ public abstract class EcoPlugin extends JavaPlugin {
         }
 
         if (this.getBStatsId() != 0) {
-            new Metrics(this, this.getBStatsId());
+            Eco.getHandler().registerBStats(this);
         }
 
         Set<String> enabledPlugins = Arrays.stream(Bukkit.getPluginManager().getPlugins()).map(Plugin::getName).collect(Collectors.toSet());
@@ -406,7 +405,6 @@ public abstract class EcoPlugin extends JavaPlugin {
 
         this.getEventManager().unregisterAllListeners();
         this.getScheduler().cancelAll();
-        this.getConfigHandler().saveAllConfigs();
 
         this.handleDisable();
 
@@ -615,7 +613,7 @@ public abstract class EcoPlugin extends JavaPlugin {
      * @param <T>        The proxy type.
      * @return The proxy.
      */
-    public <T extends AbstractProxy> T getProxy(@NotNull final Class<T> proxyClass) {
+    public final <T extends AbstractProxy> T getProxy(@NotNull final Class<T> proxyClass) {
         Validate.notNull(proxyFactory, "Plugin does not support proxy!");
 
         return proxyFactory.getProxy(proxyClass);

eco-api/src/main/java/com/willfp/eco/core/Handler.java

@@ -8,11 +8,13 @@ import com.willfp.eco.core.extensions.ExtensionLoader;
 import com.willfp.eco.core.factory.MetadataValueFactory;
 import com.willfp.eco.core.factory.NamespacedKeyFactory;
 import com.willfp.eco.core.factory.RunnableFactory;
+import com.willfp.eco.core.fast.FastItemStack;
 import com.willfp.eco.core.gui.GUIFactory;
 import com.willfp.eco.core.integrations.placeholder.PlaceholderIntegration;
 import com.willfp.eco.core.proxy.Cleaner;
 import com.willfp.eco.core.proxy.ProxyFactory;
 import com.willfp.eco.core.scheduling.Scheduler;
+import org.bukkit.inventory.ItemStack;
 import org.jetbrains.annotations.NotNull;
 
 import java.util.List;
@@ -158,4 +160,19 @@ public interface Handler {
      * @return A list of plugin names in lowercase.
      */
     List<String> getLoadedPlugins();
+
+    /**
+     * Create a FastItemStack.
+     *
+     * @param itemStack The base ItemStack.
+     * @return The FastItemStack.
+     */
+    FastItemStack createFastItemStack(@NotNull ItemStack itemStack);
+
+    /**
+     * Register bStats metrics.
+     *
+     * @param plugin The plugin.
+     */
+    void registerBStats(@NotNull EcoPlugin plugin);
 }

eco-api/src/main/java/com/willfp/eco/core/Prerequisite.java

@@ -30,6 +30,14 @@ public class Prerequisite {
             "Requires server to be running paper (or a fork)"
     );
 
+    /**
+     * Requires the server to be running an implementation of paper.
+     */
+    public static final Prerequisite HAS_VAULT = new Prerequisite(
+            () -> ClassUtils.exists("net.milkbowl.vault.economy.Economy"),
+            "Requires server to have vault"
+    );
+
     /**
      * Requires the server to be running 1.17.
      */

eco-api/src/main/java/com/willfp/eco/core/display/Display.java

@@ -71,10 +71,6 @@ public class Display {
      */
     public ItemStack display(@NotNull final ItemStack itemStack,
                              @Nullable final Player player) {
-        if (!itemStack.hasItemMeta()) {
-            return itemStack; // return early if there's no customization of the item
-        }
-
         Map<String, Object[]> pluginVarArgs = new HashMap<>();
 
         for (DisplayPriority priority : DisplayPriority.values()) {
@@ -139,10 +135,6 @@ public class Display {
             unfinalize(itemStack);
         }
 
-        if (!itemStack.hasItemMeta()) {
-            return itemStack;
-        }
-
         ItemMeta meta = itemStack.getItemMeta();
 
         if (meta == null) {

eco-api/src/main/java/com/willfp/eco/core/display/DisplayModule.java

@@ -6,6 +6,7 @@ import lombok.Getter;
 import org.bukkit.entity.Player;
 import org.bukkit.inventory.ItemStack;
 import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
 
 /**
  * Class for all plugin-specific client-side item display modules.
@@ -48,7 +49,7 @@ public abstract class DisplayModule extends PluginDependent<EcoPlugin> {
      * @param args      Optional args for display.
      */
     protected void display(@NotNull final ItemStack itemStack,
-                           @NotNull final Player player,
+                           @Nullable final Player player,
                            @NotNull final Object... args) {
         // Technically optional.
     }

eco-api/src/main/java/com/willfp/eco/core/events/ArmorEquipEvent.java

@@ -13,7 +13,10 @@ import org.jetbrains.annotations.NotNull;
  * <p>
  * The event is called before the player's inventory actually updates,
  * so you can check a tick later to see the new contents.
+ *
+ * @see ArmorChangeEvent
  */
+@Deprecated
 public class ArmorEquipEvent extends PlayerEvent {
     /**
      * Bukkit parity.

eco-api/src/main/java/com/willfp/eco/core/fast/FastItemStack.java

@@ -0,0 +1,81 @@
+package com.willfp.eco.core.fast;
+
+import com.willfp.eco.core.Eco;
+import org.bukkit.Material;
+import org.bukkit.enchantments.Enchantment;
+import org.bukkit.inventory.ItemStack;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.util.List;
+import java.util.Map;
+import java.util.Objects;
+
+/**
+ * FastItemStack contains methods to modify and read items faster than in default bukkit.
+ */
+public interface FastItemStack {
+    /**
+     * Get all enchantments on an item.
+     *
+     * @param checkStored If stored NBT should also be checked.
+     * @return A map of all enchantments.
+     */
+    Map<Enchantment, Integer> getEnchantmentsOnItem(boolean checkStored);
+
+    /**
+     * Get the level of an enchantment on an item.
+     *
+     * @param enchantment The enchantment.
+     * @param checkStored If the stored NBT should also be checked.
+     * @return The enchantment level, or 0 if not found.
+     */
+    int getLevelOnItem(@NotNull Enchantment enchantment,
+                       boolean checkStored);
+
+    /**
+     * Set the item lore.
+     *
+     * @param lore The lore.
+     */
+    void setLore(@Nullable List<String> lore);
+
+    /**
+     * Get the item lore.
+     *
+     * @return The lore.
+     */
+    List<String> getLore();
+
+
+    /**
+     * Set the rework penalty.
+     *
+     * @param cost      The rework penalty to set.
+     */
+    void setRepairCost(int cost);
+
+    /**
+     * Get the rework penalty.
+     *.
+     * @return The rework penalty found on the item.
+     */
+    int getRepairCost();
+
+    /**
+     * Get the Bukkit ItemStack again.
+     *
+     * @return The ItemStack.
+     */
+    ItemStack unwrap();
+
+    /**
+     * Wrap an ItemStack to create a FastItemStack.
+     *
+     * @param itemStack The ItemStack.
+     * @return The FastItemStack.
+     */
+    static FastItemStack wrap(final ItemStack itemStack) {
+        return Eco.getHandler().createFastItemStack(Objects.requireNonNullElseGet(itemStack, () -> new ItemStack(Material.AIR)));
+    }
+}

eco-api/src/main/java/com/willfp/eco/core/gui/GUIFactory.java

@@ -2,12 +2,10 @@ package com.willfp.eco.core.gui;
 
 import com.willfp.eco.core.gui.menu.MenuBuilder;
 import com.willfp.eco.core.gui.slot.SlotBuilder;
-import org.bukkit.entity.Player;
+import com.willfp.eco.core.gui.slot.functional.SlotProvider;
 import org.bukkit.inventory.ItemStack;
 import org.jetbrains.annotations.NotNull;
 
-import java.util.function.Function;
-
 /**
  * Internal component used by {@link com.willfp.eco.core.gui.menu.Menu#builder(int)}
  * and {@link com.willfp.eco.core.gui.slot.Slot#builder(ItemStack)}.
@@ -19,7 +17,7 @@ public interface GUIFactory {
      * @param provider The provider.
      * @return The builder.
      */
-    SlotBuilder createSlotBuilder(@NotNull Function<Player, ItemStack> provider);
+    SlotBuilder createSlotBuilder(@NotNull SlotProvider provider);
 
     /**
      * Create menu builder.

eco-api/src/main/java/com/willfp/eco/core/gui/menu/CloseHandler.java

@@ -0,0 +1,19 @@
+package com.willfp.eco.core.gui.menu;
+
+import org.bukkit.event.inventory.InventoryCloseEvent;
+import org.jetbrains.annotations.NotNull;
+
+/**
+ * Interface to run on menu close.
+ */
+@FunctionalInterface
+public interface CloseHandler {
+    /**
+     * Performs this operation on the given arguments.
+     *
+     * @param event The close event.
+     * @param menu  The menu.
+     */
+    void handle(@NotNull InventoryCloseEvent event,
+                @NotNull Menu menu);
+}

eco-api/src/main/java/com/willfp/eco/core/gui/menu/Menu.java

@@ -4,8 +4,11 @@ import com.willfp.eco.core.Eco;
 import com.willfp.eco.core.gui.slot.Slot;
 import org.bukkit.entity.Player;
 import org.bukkit.inventory.Inventory;
+import org.bukkit.inventory.ItemStack;
 import org.jetbrains.annotations.NotNull;
 
+import java.util.List;
+
 /**
  * GUI version of {@link Inventory}.
  * <p>
@@ -44,6 +47,14 @@ public interface Menu {
      */
     Inventory open(@NotNull Player player);
 
+    /**
+     * Get captive items.
+     *
+     * @param player The player.
+     * @return The items.
+     */
+    List<ItemStack> getCaptiveItems(@NotNull Player player);
+
     /**
      * Create a builder with a given amount of rows.
      *

eco-api/src/main/java/com/willfp/eco/core/gui/menu/MenuBuilder.java

@@ -31,6 +31,14 @@ public interface MenuBuilder {
                         int column,
                         @NotNull Slot slot);
 
+    /**
+     * Run function to modify the builder.
+     *
+     * @param modifier The modifier.
+     * @return The builder.
+     */
+    MenuBuilder modfiy(@NotNull Consumer<MenuBuilder> modifier);
+
     /**
      * Set the menu mask.
      *
@@ -45,7 +53,18 @@ public interface MenuBuilder {
      * @param action The handler.
      * @return The builder.
      */
-    MenuBuilder onClose(@NotNull Consumer<InventoryCloseEvent> action);
+    default MenuBuilder onClose(@NotNull Consumer<InventoryCloseEvent> action) {
+        onClose((event, menu) -> action.accept(event));
+        return this;
+    }
+
+    /**
+     * Set the menu close handler.
+     *
+     * @param action The handler.
+     * @return The builder.
+     */
+    MenuBuilder onClose(@NotNull CloseHandler action);
 
     /**
      * Build the menu.

eco-api/src/main/java/com/willfp/eco/core/gui/slot/FillerMask.java

@@ -7,6 +7,7 @@ import org.bukkit.Material;
 import org.bukkit.inventory.ItemStack;
 import org.jetbrains.annotations.NotNull;
 
+import java.util.Arrays;
 import java.util.List;
 
 /**
@@ -39,35 +40,46 @@ public class FillerMask {
      */
     public FillerMask(@NotNull final Material material,
                       @NotNull final String... pattern) {
-        if (material == Material.AIR) {
-            throw new IllegalArgumentException("Material cannot be air!");
+        this(new MaskMaterials(material), pattern);
+    }
+
+    /**
+     * Create a new filler mask.
+     *
+     * @param materials The mask materials.
+     * @param pattern  The pattern.
+     */
+    public FillerMask(@NotNull final MaskMaterials materials,
+                      @NotNull final String... pattern) {
+        if (Arrays.stream(materials.materials()).anyMatch(material -> material == Material.AIR)) {
+            throw new IllegalArgumentException("Materials cannot be air!");
         }
 
         mask = ListUtils.create2DList(6, 9);
 
-        ItemStack itemStack = new ItemStackBuilder(material)
-                .setDisplayName("&r")
-                .build();
+        for (int i = 0; i < materials.materials().length; i++) {
+            ItemStack itemStack = new ItemStackBuilder(materials.materials()[i])
+                    .setDisplayName("&r")
+                    .build();
 
-        int row = 0;
+            int row = 0;
 
-        for (String patternRow : pattern) {
-            int column = 0;
-            if (patternRow.length() != 9) {
-                throw new IllegalArgumentException("Invalid amount of columns in pattern!");
-            }
-            for (char c : patternRow.toCharArray()) {
-                if (c == '0') {
-                    mask.get(row).set(column, null);
-                } else if (c == '1') {
-                    mask.get(row).set(column, new FillerSlot(itemStack));
-                } else {
-                    throw new IllegalArgumentException("Invalid character in pattern! (Must only be 0 and 1)");
+            for (String patternRow : pattern) {
+                int column = 0;
+                if (patternRow.length() != 9) {
+                    throw new IllegalArgumentException("Invalid amount of columns in pattern!");
                 }
+                for (char c : patternRow.toCharArray()) {
+                    if (c == '0') {
+                        mask.get(row).set(column, null);
+                    } else if (c == Character.forDigit(i + 1, 10)) {
+                        mask.get(row).set(column, new FillerSlot(itemStack));
+                    }
 
-                column++;
+                    column++;
+                }
+                row++;
             }
-            row++;
         }
     }
 }

eco-api/src/main/java/com/willfp/eco/core/gui/slot/FillerSlot.java

@@ -30,4 +30,9 @@ public class FillerSlot implements Slot {
     public ItemStack getItemStack(@NotNull final Player player) {
         return itemStack;
     }
+
+    @Override
+    public boolean isCaptive() {
+        return false;
+    }
 }

eco-api/src/main/java/com/willfp/eco/core/gui/slot/MaskMaterials.java

@@ -0,0 +1,14 @@
+package com.willfp.eco.core.gui.slot;
+
+import org.bukkit.Material;
+import org.jetbrains.annotations.NotNull;
+
+/**
+ * Mask materials store a set of materials which can be accessed by
+ * a filler mask.
+ *
+ * @param materials The materials.
+ */
+public record MaskMaterials(@NotNull Material... materials) {
+
+}

eco-api/src/main/java/com/willfp/eco/core/gui/slot/Slot.java

@@ -1,6 +1,8 @@
 package com.willfp.eco.core.gui.slot;
 
 import com.willfp.eco.core.Eco;
+import com.willfp.eco.core.gui.slot.functional.SlotProvider;
+import org.bukkit.Material;
 import org.bukkit.entity.Player;
 import org.bukkit.inventory.ItemStack;
 import org.jetbrains.annotations.NotNull;
@@ -19,6 +21,22 @@ public interface Slot {
      */
     ItemStack getItemStack(@NotNull Player player);
 
+    /**
+     * If the slot is captive. (Can items be placed in it).
+     *
+     * @return If captive.
+     */
+    boolean isCaptive();
+
+    /**
+     * Create a builder for an ItemStack.
+     *
+     * @return The builder.
+     */
+    static SlotBuilder builder() {
+        return Eco.getHandler().getGUIFactory().createSlotBuilder((player, menu) -> new ItemStack(Material.AIR));
+    }
+
     /**
      * Create a builder for an ItemStack.
      *
@@ -26,7 +44,7 @@ public interface Slot {
      * @return The builder.
      */
     static SlotBuilder builder(@NotNull final ItemStack itemStack) {
-        return Eco.getHandler().getGUIFactory().createSlotBuilder(player -> itemStack);
+        return Eco.getHandler().getGUIFactory().createSlotBuilder((player, menu) -> itemStack);
     }
 
     /**
@@ -36,6 +54,16 @@ public interface Slot {
      * @return The builder.
      */
     static SlotBuilder builder(@NotNull final Function<Player, ItemStack> provider) {
+        return Eco.getHandler().getGUIFactory().createSlotBuilder((player, menu) -> provider.apply(player));
+    }
+
+    /**
+     * Create a builder for a player-specific ItemStack.
+     *
+     * @param provider The provider.
+     * @return The builder.
+     */
+    static SlotBuilder builder(@NotNull final SlotProvider provider) {
         return Eco.getHandler().getGUIFactory().createSlotBuilder(provider);
     }
 }

eco-api/src/main/java/com/willfp/eco/core/gui/slot/SlotBuilder.java

@@ -1,5 +1,7 @@
 package com.willfp.eco.core.gui.slot;
 
+import com.willfp.eco.core.gui.slot.functional.SlotHandler;
+import com.willfp.eco.core.gui.slot.functional.SlotModifier;
 import org.bukkit.event.inventory.InventoryClickEvent;
 import org.jetbrains.annotations.NotNull;
 
@@ -15,7 +17,17 @@ public interface SlotBuilder {
      * @param action The handler.
      * @return The builder.
      */
-    SlotBuilder onLeftClick(@NotNull BiConsumer<InventoryClickEvent, Slot> action);
+    default SlotBuilder onLeftClick(@NotNull BiConsumer<InventoryClickEvent, Slot> action) {
+        return onLeftClick((event, slot, menu) -> action.accept(event, slot));
+    }
+
+    /**
+     * Set click handler.
+     *
+     * @param handler The handler.
+     * @return The builder.
+     */
+    SlotBuilder onLeftClick(@NotNull SlotHandler handler);
 
     /**
      * Set click handler.
@@ -23,7 +35,17 @@ public interface SlotBuilder {
      * @param action The handler.
      * @return The builder.
      */
-    SlotBuilder onRightClick(@NotNull BiConsumer<InventoryClickEvent, Slot> action);
+    default SlotBuilder onRightClick(@NotNull BiConsumer<InventoryClickEvent, Slot> action) {
+        return onRightClick((event, slot, menu) -> action.accept(event, slot));
+    }
+
+    /**
+     * Set click handler.
+     *
+     * @param handler The handler.
+     * @return The builder.
+     */
+    SlotBuilder onRightClick(@NotNull SlotHandler handler);
 
     /**
      * Set click handler.
@@ -31,7 +53,17 @@ public interface SlotBuilder {
      * @param action The handler.
      * @return The builder.
      */
-    SlotBuilder onShiftLeftClick(@NotNull BiConsumer<InventoryClickEvent, Slot> action);
+    default SlotBuilder onShiftLeftClick(@NotNull BiConsumer<InventoryClickEvent, Slot> action) {
+        return onShiftLeftClick((event, slot, menu) -> action.accept(event, slot));
+    }
+
+    /**
+     * Set click handler.
+     *
+     * @param handler The handler.
+     * @return The builder.
+     */
+    SlotBuilder onShiftLeftClick(@NotNull SlotHandler handler);
 
     /**
      * Set click handler.
@@ -39,7 +71,17 @@ public interface SlotBuilder {
      * @param action The handler.
      * @return The builder.
      */
-    SlotBuilder onShiftRightClick(@NotNull BiConsumer<InventoryClickEvent, Slot> action);
+    default SlotBuilder onShiftRightClick(@NotNull BiConsumer<InventoryClickEvent, Slot> action) {
+        return onShiftRightClick((event, slot, menu) -> action.accept(event, slot));
+    }
+
+    /**
+     * Set click handler.
+     *
+     * @param handler The handler.
+     * @return The builder.
+     */
+    SlotBuilder onShiftRightClick(@NotNull SlotHandler handler);
 
     /**
      * Set click handler.
@@ -47,7 +89,32 @@ public interface SlotBuilder {
      * @param action The handler.
      * @return The builder.
      */
-    SlotBuilder onMiddleClick(@NotNull BiConsumer<InventoryClickEvent, Slot> action);
+    default SlotBuilder onMiddleClick(@NotNull BiConsumer<InventoryClickEvent, Slot> action) {
+        return onMiddleClick((event, slot, menu) -> action.accept(event, slot));
+    }
+
+    /**
+     * Set click handler.
+     *
+     * @param handler The handler.
+     * @return The builder.
+     */
+    SlotBuilder onMiddleClick(@NotNull SlotHandler handler);
+
+    /**
+     * Modify the ItemStack.
+     *
+     * @param modifier The modifier.
+     * @return The builder.
+     */
+    SlotBuilder setModifier(@NotNull SlotModifier modifier);
+
+    /**
+     * Set slot to be a captive slot.
+     *
+     * @return The builder.
+     */
+    SlotBuilder setCaptive();
 
     /**
      * Build the slot.

eco-api/src/main/java/com/willfp/eco/core/gui/slot/functional/SlotHandler.java

@@ -0,0 +1,23 @@
+package com.willfp.eco.core.gui.slot.functional;
+
+import com.willfp.eco.core.gui.menu.Menu;
+import com.willfp.eco.core.gui.slot.Slot;
+import org.bukkit.event.inventory.InventoryClickEvent;
+import org.jetbrains.annotations.NotNull;
+
+/**
+ * Interface to run on slot click.
+ */
+@FunctionalInterface
+public interface SlotHandler {
+    /**
+     * Performs this operation on the given arguments.
+     *
+     * @param event The click event.
+     * @param slot  The slot
+     * @param menu  The menu.
+     */
+    void handle(@NotNull InventoryClickEvent event,
+                @NotNull Slot slot,
+                @NotNull Menu menu);
+}

eco-api/src/main/java/com/willfp/eco/core/gui/slot/functional/SlotModifier.java

@@ -0,0 +1,23 @@
+package com.willfp.eco.core.gui.slot.functional;
+
+import com.willfp.eco.core.gui.menu.Menu;
+import org.bukkit.entity.Player;
+import org.bukkit.inventory.ItemStack;
+import org.jetbrains.annotations.NotNull;
+
+/**
+ * Interface to run on slot modify.
+ */
+@FunctionalInterface
+public interface SlotModifier {
+    /**
+     * Performs this operation on the given arguments.
+     *
+     * @param player   The player.
+     * @param menu     The menu.
+     * @param previous The previous ItemStack.
+     */
+    void modify(@NotNull Player player,
+                @NotNull Menu menu,
+                @NotNull ItemStack previous);
+}

eco-api/src/main/java/com/willfp/eco/core/gui/slot/functional/SlotProvider.java

@@ -0,0 +1,22 @@
+package com.willfp.eco.core.gui.slot.functional;
+
+import com.willfp.eco.core.gui.menu.Menu;
+import org.bukkit.entity.Player;
+import org.bukkit.inventory.ItemStack;
+import org.jetbrains.annotations.NotNull;
+
+/**
+ * Interface to run on slot display.
+ */
+@FunctionalInterface
+public interface SlotProvider {
+    /**
+     * Performs this operation on the given arguments.
+     *
+     * @param player The player.
+     * @param menu   The menu.
+     * @return The ItemStack.
+     */
+    ItemStack provide(@NotNull Player player,
+                      @NotNull Menu menu);
+}

eco-api/src/main/java/com/willfp/eco/core/integrations/placeholder/PlaceholderEntry.java

@@ -77,4 +77,11 @@ public class PlaceholderEntry {
     public boolean requiresPlayer() {
         return requiresPlayer;
     }
+
+    /**
+     * Register the placeholder.
+     */
+    public void register() {
+        PlaceholderManager.registerPlaceholder(this);
+    }
 }

eco-api/src/main/java/com/willfp/eco/core/items/CustomItem.java

@@ -27,7 +27,7 @@ public class CustomItem implements TestableItem {
     /**
      * The test for ItemStacks to pass.
      */
-    private final Predicate<ItemStack> test;
+    private final Predicate<@NotNull ItemStack> test;
 
     /**
      * Example Item: what the user should see.
@@ -42,7 +42,7 @@ public class CustomItem implements TestableItem {
      * @param item The example ItemStacks.
      */
     public CustomItem(@NotNull final NamespacedKey key,
-                      @NotNull final Predicate<ItemStack> test,
+                      @NotNull final Predicate<@NotNull ItemStack> test,
                       @NotNull final ItemStack item) {
         this.key = key;
         this.test = test;
@@ -51,6 +51,10 @@ public class CustomItem implements TestableItem {
 
     @Override
     public boolean matches(@Nullable final ItemStack itemStack) {
+        if (itemStack == null) {
+            return false;
+        }
+
         return test.test(itemStack);
     }
 

eco-api/src/main/java/com/willfp/eco/core/items/Items.java

@@ -60,6 +60,18 @@ public final class Items {
      * @return The found testable item, or an empty item if not found.
      */
     public TestableItem lookup(@NotNull final String key) {
+        if (key.contains("?")) {
+            String[] options = key.split("\\?");
+            for (String option : options) {
+                TestableItem lookup = lookup(option);
+                if (!(lookup instanceof EmptyTestableItem)) {
+                    return lookup;
+                }
+            }
+
+            return new EmptyTestableItem();
+        }
+
         String[] args = key.split(" ");
         if (args.length == 0) {
             return new EmptyTestableItem();

eco-api/src/main/java/com/willfp/eco/util/BlockUtils.java

@@ -1,6 +1,5 @@
 package com.willfp.eco.util;
 
-import com.willfp.eco.core.tuples.Pair;
 import lombok.experimental.UtilityClass;
 import org.apache.commons.lang.Validate;
 import org.bukkit.Location;
@@ -32,12 +31,10 @@ public class BlockUtils {
      */
     private BiConsumer<Player, Block> blockBreakConsumer = null;
 
-    private Pair<Block, Set<Block>> getNearbyBlocksRecursively(@NotNull final Block start,
-                                                               @NotNull final List<Material> allowedMaterials,
-                                                               @NotNull final Set<Block> blocks,
-                                                               final int limit) {
-        Block last = start;
-
+    private Set<Block> getNearbyBlocks(@NotNull final Block start,
+                                       @NotNull final List<Material> allowedMaterials,
+                                       @NotNull final Set<Block> blocks,
+                                       final int limit) {
         for (BlockFace face : BlockFace.values()) {
             Block block = start.getRelative(face);
             if (blocks.contains(block)) {
@@ -46,46 +43,15 @@ public class BlockUtils {
 
             if (allowedMaterials.contains(block.getType())) {
                 blocks.add(block);
-                last = block;
 
-                if (blocks.size() > limit) {
-                    return new Pair<>(last, blocks);
+                if (blocks.size() > limit || blocks.size() > 2500) {
+                    return blocks;
                 }
 
-                Pair<Block, Set<Block>> pair = getNearbyBlocksRecursively(last, allowedMaterials, blocks, limit);
-                assert pair.getSecond() != null;
-
-                blocks.addAll(pair.getSecond());
+                blocks.addAll(getNearbyBlocks(block, allowedMaterials, blocks, limit));
             }
         }
 
-        return new Pair<>(last, blocks);
-    }
-
-    private Set<Block> getNearbyBlocks(@NotNull final Block start,
-                                       @NotNull final List<Material> allowedMaterials,
-                                       @NotNull final Set<Block> blocks,
-                                       final int limit) {
-        /*
-        Prevent stack overflow.
-         */
-        int cycles = (int) Math.ceil(limit / 1024D);
-
-        int cap = limit;
-        Block iterStart = start;
-
-        for (int i = 0; i < cycles; i++) {
-            assert iterStart != null;
-
-            Pair<Block, Set<Block>> pair = getNearbyBlocksRecursively(iterStart, allowedMaterials, blocks, cap);
-            assert pair.getSecond() != null;
-            iterStart = pair.getFirst();
-
-            blocks.addAll(pair.getSecond());
-
-            cap -= 1024;
-        }
-
         return blocks;
     }
 

eco-api/src/main/java/com/willfp/eco/util/MenuUtils.java

@@ -0,0 +1,22 @@
+package com.willfp.eco.util;
+
+import com.willfp.eco.core.tuples.Pair;
+import lombok.experimental.UtilityClass;
+
+/**
+ * Utilities / API methods for menus.
+ */
+@UtilityClass
+public class MenuUtils {
+    /**
+     * Convert 0-53 slot to row and column pair.
+     *
+     * @param slot The slot.
+     * @return The pair of row and columns.
+     */
+    public Pair<Integer, Integer> convertSlotToRowColumn(final int slot) {
+        int row = Math.floorDiv(slot, 9);
+        int column = slot - row * 9;
+        return new Pair<>(row + 1, column + 1);
+    }
+}

eco-api/src/main/java/com/willfp/eco/util/NumberUtils.java

@@ -131,7 +131,7 @@ public class NumberUtils {
         if (numeral.isEmpty()) {
             return 0;
         }
-        for (Map.Entry<Integer, String> entry : NUMERALS.entrySet()) {
+        for (Map.Entry<Integer, String> entry : NUMERALS.descendingMap().entrySet()) {
             if (numeral.startsWith(entry.getValue())) {
                 return entry.getKey() + fromNumeral(numeral.substring(entry.getValue().length()));
             }

eco-api/src/main/java/com/willfp/eco/util/StringUtils.java

@@ -3,6 +3,10 @@ package com.willfp.eco.util;
 import com.google.common.collect.ImmutableList;
 import com.willfp.eco.core.integrations.placeholder.PlaceholderManager;
 import lombok.experimental.UtilityClass;
+import net.kyori.adventure.text.Component;
+import net.kyori.adventure.text.format.TextDecoration;
+import net.kyori.adventure.text.serializer.gson.GsonComponentSerializer;
+import net.kyori.adventure.text.serializer.legacy.LegacyComponentSerializer;
 import net.md_5.bungee.api.ChatColor;
 import org.bukkit.entity.Player;
 import org.jetbrains.annotations.NotNull;
@@ -27,9 +31,9 @@ public class StringUtils {
      * Regexes for gradients.
      */
     private static final List<Pattern> GRADIENT_PATTERNS = new ImmutableList.Builder<Pattern>()
-            .add(Pattern.compile("<GRADIENT:([0-9A-Fa-f]{6})>(.*?)</GRADIENT:([0-9A-Fa-f]{6})>"))
-            .add(Pattern.compile("<gradient:([0-9A-Fa-f]{6})>(.*?)</gradient:([0-9A-Fa-f]{6})>"))
-            .add(Pattern.compile("<G:([0-9A-Fa-f]{6})>(.*?)</G:([0-9A-Fa-f]{6})>"))
+            .add(Pattern.compile("<GRADIENT:([0-9A-Fa-f]{6})>(.*?)</GRADIENT:([0-9A-Fa-f]{6})>", Pattern.CASE_INSENSITIVE))
+            .add(Pattern.compile("<GRADIENT:#([0-9A-Fa-f]{6})>(.*?)</GRADIENT:#([0-9A-Fa-f]{6})>", Pattern.CASE_INSENSITIVE))
+            .add(Pattern.compile("<G:([0-9A-Fa-f]{6})>(.*?)</G:([0-9A-Fa-f]{6})>", Pattern.CASE_INSENSITIVE))
             .add(Pattern.compile("<#:([0-9A-Fa-f]{6})>(.*?)</#:([0-9A-Fa-f]{6})>"))
             .add(Pattern.compile("\\{#:([0-9A-Fa-f]{6})}(.*?)\\{/#:([0-9A-Fa-f]{6})}"))
             .build();
@@ -43,6 +47,15 @@ public class StringUtils {
             .add(Pattern.compile("<#" + "([A-Fa-f0-9]{6})" + ">"))
             .build();
 
+    /**
+     * Legacy serializer.
+     */
+    private static final LegacyComponentSerializer LEGACY_COMPONENT_SERIALIZER = LegacyComponentSerializer.builder()
+            .character('\u00a7')
+            .useUnusualXRepeatedCharacterHexFormat()
+            .hexColors()
+            .build();
+
     /**
      * Format a list of strings - converts Placeholders and Color codes.
      *
@@ -122,14 +135,6 @@ public class StringUtils {
         return matcher.appendTail(builder).toString();
     }
 
-    /**
-     * Colors a string with a gradient.
-     *
-     * @param string The string to color.
-     * @param start  The start color.
-     * @param end    The end color.
-     * @return The string, colored.
-     */
     private static String processGradients(@NotNull final String string,
                                            @NotNull final Color start,
                                            @NotNull final Color end) {
@@ -167,14 +172,6 @@ public class StringUtils {
         return stringBuilder.toString();
     }
 
-    /**
-     * Creates chatColors for gradients.
-     *
-     * @param start The start color.
-     * @param end   The end color.
-     * @param step  How many colors are returned.
-     * @return Array of chat colors.
-     */
     private static ChatColor[] getGradientColors(@NotNull final Color start,
                                                  @NotNull final Color end,
                                                  final int step) {
@@ -195,12 +192,6 @@ public class StringUtils {
         return colors;
     }
 
-    /**
-     * Add gradients to a string.
-     *
-     * @param string The string.
-     * @return The string, colorized.
-     */
     private static String translateGradients(@NotNull final String string) {
         String processedString = string;
         for (Pattern pattern : GRADIENT_PATTERNS) {
@@ -254,4 +245,30 @@ public class StringUtils {
         }
         return string;
     }
+
+    /**
+     * Convert legacy string to JSON.
+     *
+     * @param legacy The legacy string.
+     * @return The JSON String.
+     */
+    public String legacyToJson(@NotNull final String legacy) {
+        return GsonComponentSerializer.gson().serialize(
+                Component.empty().decoration(TextDecoration.ITALIC, false).append(
+                        LEGACY_COMPONENT_SERIALIZER.deserialize(legacy)
+                )
+        );
+    }
+
+    /**
+     * Convert JSON string to legacy.
+     *
+     * @param json The JSON string.
+     * @return The legacy string.
+     */
+    public String jsonToLegacy(@NotNull final String json) {
+        return LEGACY_COMPONENT_SERIALIZER.serialize(
+                GsonComponentSerializer.gson().deserialize(json)
+        );
+    }
 }

eco-api/src/test/java/NumberUtilsTest.java

@@ -0,0 +1,24 @@
+import com.willfp.eco.util.NumberUtils;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+public class NumberUtilsTest {
+    @Test
+    public void testFormatDouble() {
+        Assertions.assertEquals("3", NumberUtils.format(3.0D));
+        Assertions.assertEquals("3.20", NumberUtils.format(3.2D));
+    }
+
+    @Test
+    public void testLog2() {
+        Assertions.assertEquals(1, NumberUtils.log2(2));
+    }
+
+    @Test
+    public void testNumerals() {
+        Assertions.assertEquals(4, NumberUtils.fromNumeral("IV"));
+        Assertions.assertEquals(9, NumberUtils.fromNumeral("IX"));
+        Assertions.assertEquals("XIV", NumberUtils.toNumeral(14));
+        Assertions.assertEquals("XXI", NumberUtils.toNumeral(21));
+    }
+}

eco-core/build.gradle

@@ -1,8 +1,21 @@
+buildscript {
+    repositories {
+        mavenCentral()
+    }
+
+    dependencies {
+        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:1.5.21"
+    }
+}
+
 group 'com.willfp'
 version rootProject.version
 
 subprojects {
+    apply plugin: "kotlin"
+
     dependencies {
         compileOnly project(":eco-api")
+        compileOnly 'org.jetbrains.kotlin:kotlin-stdlib:1.5.21'
     }
 }

eco-core/core-backend/src/main/java/com/willfp/eco/internal/EcoCleaner.java

@@ -1,39 +0,0 @@
-package com.willfp.eco.internal;
-
-import com.willfp.eco.core.EcoPlugin;
-import com.willfp.eco.core.items.CustomItem;
-import com.willfp.eco.core.items.Items;
-import com.willfp.eco.core.proxy.Cleaner;
-import com.willfp.eco.internal.proxy.EcoProxyFactory;
-import org.jetbrains.annotations.NotNull;
-
-import java.io.IOException;
-import java.net.URLClassLoader;
-
-public class EcoCleaner implements Cleaner {
-    @Override
-    public void clean(@NotNull final EcoPlugin plugin) {
-        if (!plugin.getProxyPackage().equalsIgnoreCase("")) {
-            EcoProxyFactory factory = (EcoProxyFactory) plugin.getProxyFactory();
-            factory.clean();
-        }
-
-        Plugins.LOADED_ECO_PLUGINS.remove(plugin.getName().toLowerCase());
-
-        for (CustomItem customItem : Items.getCustomItems()) {
-            if (customItem.getKey().getNamespace().equalsIgnoreCase(plugin.getName().toLowerCase())) {
-                Items.removeCustomItem(customItem.getKey());
-            }
-        }
-
-        if (plugin.getClass().getClassLoader() instanceof URLClassLoader urlClassLoader) {
-            try {
-                urlClassLoader.close();
-            } catch (IOException e) {
-                // Do nothing.
-            }
-        }
-
-        System.gc();
-    }
-}

eco-core/core-backend/src/main/java/com/willfp/eco/internal/Plugins.java

@@ -1,12 +0,0 @@
-package com.willfp.eco.internal;
-
-import com.willfp.eco.core.EcoPlugin;
-import lombok.experimental.UtilityClass;
-
-import java.util.HashMap;
-import java.util.Map;
-
-@UtilityClass
-public class Plugins {
-    public static final Map<String, EcoPlugin> LOADED_ECO_PLUGINS = new HashMap<>();
-}

eco-core/core-backend/src/main/java/com/willfp/eco/internal/config/EcoConfigFactory.java

@@ -1,70 +0,0 @@
-package com.willfp.eco.internal.config;
-
-import com.willfp.eco.core.EcoPlugin;
-import com.willfp.eco.core.config.interfaces.Config;
-import com.willfp.eco.core.config.interfaces.JSONConfig;
-import com.willfp.eco.core.config.wrapper.ConfigFactory;
-import com.willfp.eco.internal.config.json.EcoJSONConfigSection;
-import com.willfp.eco.internal.config.json.EcoLoadableJSONConfig;
-import com.willfp.eco.internal.config.yaml.EcoLoadableYamlConfig;
-import com.willfp.eco.internal.config.yaml.EcoUpdatableYamlConfig;
-import com.willfp.eco.internal.config.yaml.EcoYamlConfigSection;
-import org.bukkit.configuration.file.YamlConfiguration;
-import org.jetbrains.annotations.NotNull;
-
-import java.util.Map;
-
-public class EcoConfigFactory implements ConfigFactory {
-    @Override
-    public Config createUpdatableYamlConfig(@NotNull final String configName,
-                                            @NotNull final EcoPlugin plugin,
-                                            @NotNull final String subDirectoryPath,
-                                            @NotNull final Class<?> source,
-                                            final boolean removeUnused,
-                                            @NotNull final String... updateBlacklist) {
-        return new EcoUpdatableYamlConfig(
-                configName,
-                plugin,
-                subDirectoryPath,
-                source,
-                removeUnused,
-                updateBlacklist
-        );
-    }
-
-    @Override
-    public JSONConfig createLoadableJSONConfig(@NotNull final String configName,
-                                               @NotNull final EcoPlugin plugin,
-                                               @NotNull final String subDirectoryPath,
-                                               @NotNull final Class<?> source) {
-        return new EcoLoadableJSONConfig(
-                configName,
-                plugin,
-                subDirectoryPath,
-                source
-        );
-    }
-
-    @Override
-    public Config createLoadableYamlConfig(@NotNull final String configName,
-                                           @NotNull final EcoPlugin plugin,
-                                           @NotNull final String subDirectoryPath,
-                                           @NotNull final Class<?> source) {
-        return new EcoLoadableYamlConfig(
-                configName,
-                plugin,
-                subDirectoryPath,
-                source
-        );
-    }
-
-    @Override
-    public Config createYamlConfig(@NotNull final YamlConfiguration config) {
-        return new EcoYamlConfigSection(config);
-    }
-
-    @Override
-    public JSONConfig createJSONConfig(@NotNull final Map<String, Object> values) {
-        return new EcoJSONConfigSection(values);
-    }
-}

eco-core/core-backend/src/main/java/com/willfp/eco/internal/config/json/EcoJSONConfigSection.java

@@ -1,11 +0,0 @@
-package com.willfp.eco.internal.config.json;
-
-import org.jetbrains.annotations.NotNull;
-
-import java.util.Map;
-
-public class EcoJSONConfigSection extends EcoJSONConfigWrapper {
-    public EcoJSONConfigSection(@NotNull final Map<String, Object> values) {
-        this.init(values);
-    }
-}

eco-core/core-backend/src/main/java/com/willfp/eco/internal/config/json/EcoJSONConfigWrapper.java

@@ -1,368 +0,0 @@
-package com.willfp.eco.internal.config.json;
-
-import com.google.gson.Gson;
-import com.google.gson.GsonBuilder;
-import com.willfp.eco.core.config.interfaces.JSONConfig;
-import com.willfp.eco.util.StringUtils;
-import lombok.Getter;
-import org.apache.commons.lang.Validate;
-import org.jetbrains.annotations.NotNull;
-import org.jetbrains.annotations.Nullable;
-
-import java.util.ArrayList;
-import java.util.HashMap;
-import java.util.HashSet;
-import java.util.List;
-import java.util.Map;
-import java.util.Objects;
-import java.util.Set;
-
-@SuppressWarnings({"unchecked", "unused"})
-public class EcoJSONConfigWrapper implements JSONConfig {
-    @Getter
-    private final Gson handle = new GsonBuilder().setPrettyPrinting().create();
-    
-    @Getter
-    private final Map<String, Object> values = new HashMap<>();
-
-    @Getter
-    private final Map<String, Object> cache = new HashMap<>();
-    
-    public EcoJSONConfigWrapper() {
-
-    }
-
-    public void init(@NotNull final Map<String, Object> values) {
-        this.values.clear();
-        this.values.putAll(values);
-    }
-
-    @Override
-    public final void clearCache() {
-        cache.clear();
-    }
-
-    @Override
-    public String toPlaintext() {
-        return this.getHandle().toJson(this.getValues());
-    }
-
-    @Override
-    public boolean has(@NotNull final String path) {
-        return getOfKnownType(path, Object.class) != null;
-    }
-
-    @Nullable
-    protected <T> T getOfKnownType(@NotNull final String path,
-                                   @NotNull final Class<T> clazz) {
-        return getOfKnownType(path, clazz, true);
-    }
-
-    @Nullable
-    protected <T> T getOfKnownType(@NotNull final String path,
-                                   @NotNull final Class<T> clazz,
-                                   final boolean isBase) {
-        String closestPath = path;
-
-        if (cache.containsKey(path) && isBase) {
-            return (T) cache.get(path);
-        }
-
-        if (path.contains(".")) {
-            String[] split = path.split("\\.");
-            closestPath = split[0];
-        }
-
-        if (values.get(closestPath) instanceof Map && !path.equals(closestPath)) {
-            EcoJSONConfigSection section = new EcoJSONConfigSection((Map<String, Object>) values.get(closestPath));
-            return section.getOfKnownType(path.substring(closestPath.length() + 1), clazz, false);
-        } else {
-            if (values.containsKey(closestPath)) {
-                return (T) values.get(closestPath);
-            } else {
-                return null;
-            }
-        }
-    }
-
-    @NotNull
-    @Override
-    public List<String> getKeys(final boolean deep) {
-        if (deep) {
-            return new ArrayList<>(getDeepKeys(new HashSet<>(), ""));
-        } else {
-            return new ArrayList<>(values.keySet());
-        }
-    }
-
-    protected Set<String> getDeepKeys(@NotNull final Set<String> list,
-                                      @NotNull final String root) {
-        for (String key : values.keySet()) {
-            list.add(root + key);
-
-            if (values.get(key) instanceof Map) {
-                EcoJSONConfigSection section = new EcoJSONConfigSection((Map<String, Object>) values.get(key));
-                list.addAll(section.getDeepKeys(list, root + key + "."));
-            }
-        }
-
-        return list;
-    }
-
-    @Override
-    @Nullable
-    public Object get(@NotNull final String path) {
-        return getOfKnownType(path, Object.class);
-    }
-
-    @Override
-    public void set(@NotNull final String path,
-                    @Nullable final Object object) {
-        setRecursively(path, object, true);
-        clearCache();
-    }
-
-    protected void setRecursively(@NotNull final String path,
-                                  @Nullable final Object object,
-                                  final boolean isBase) {
-        String closestPath = path;
-
-        if (path.contains(".")) {
-            String[] split = path.split("\\.");
-            closestPath = split[0];
-        }
-
-        if (values.get(closestPath) instanceof Map && !path.equals(closestPath)) {
-            EcoJSONConfigSection section = new EcoJSONConfigSection((Map<String, Object>) values.get(closestPath));
-            section.setRecursively(path.substring(closestPath.length() + 1), object, false);
-            values.put(closestPath, section.getValues());
-        } else {
-            Object obj = object;
-
-            if (object instanceof JSONConfig) {
-                obj = ((EcoJSONConfigWrapper) object).getValues();
-            }
-
-            values.put(path, obj);
-        }
-    }
-
-    @Override
-    @NotNull
-    public JSONConfig getSubsection(@NotNull final String path) {
-        JSONConfig subsection = getSubsectionOrNull(path);
-        Validate.notNull(subsection);
-        return subsection;
-    }
-
-    @Override
-    @Nullable
-    public JSONConfig getSubsectionOrNull(@NotNull final String path) {
-        if (values.containsKey(path)) {
-            Map<String, Object> subsection = (Map<String, Object>) values.get(path);
-            return new EcoJSONConfigSection(subsection);
-        } else {
-            return null;
-        }
-    }
-
-    @Override
-    @NotNull
-    public List<JSONConfig> getSubsections(@NotNull final String path) {
-        List<JSONConfig> subsections = getSubsectionsOrNull(path);
-        return subsections == null ? new ArrayList<>() : subsections;
-    }
-
-    @Override
-    @Nullable
-    public List<JSONConfig> getSubsectionsOrNull(@NotNull final String path) {
-        List<Map<String, Object>> maps = (List<Map<String, Object>>) getOfKnownType(path, Object.class);
-
-        if (maps == null) {
-            return null;
-        }
-
-        List<JSONConfig> configs = new ArrayList<>();
-
-        for (Map<String, Object> map : maps) {
-            configs.add(new EcoJSONConfigSection(map));
-        }
-
-        return configs;
-    }
-
-    @Override
-    public int getInt(@NotNull final String path) {
-        // ew
-        return Objects.requireNonNullElse(getOfKnownType(path, Double.class), 0D).intValue();
-    }
-
-    @Override
-    @Nullable
-    public Integer getIntOrNull(@NotNull final String path) {
-        if (has(path)) {
-            return getInt(path);
-        } else {
-            return null;
-        }
-    }
-
-    @Override
-    public int getInt(@NotNull final String path,
-                      final int def) {
-        return Objects.requireNonNullElse(getOfKnownType(path, Integer.class), def);
-    }
-
-    @Override
-    @NotNull
-    public List<Integer> getInts(@NotNull final String path) {
-        return (List<Integer>) Objects.requireNonNullElse(getOfKnownType(path, Object.class), new ArrayList<>());
-    }
-
-    @Override
-    @Nullable
-    public List<Integer> getIntsOrNull(@NotNull final String path) {
-        if (has(path)) {
-            return getInts(path);
-        } else {
-            return null;
-        }
-    }
-
-    @Override
-    public boolean getBool(@NotNull final String path) {
-        return Objects.requireNonNullElse(getOfKnownType(path, Boolean.class), false);
-    }
-
-    @Override
-    @Nullable
-    public Boolean getBoolOrNull(@NotNull final String path) {
-        if (has(path)) {
-            return getBool(path);
-        } else {
-            return null;
-        }
-    }
-
-    @Override
-    @NotNull
-    public List<Boolean> getBools(@NotNull final String path) {
-        return (List<Boolean>) Objects.requireNonNullElse(getOfKnownType(path, Object.class), new ArrayList<>());
-    }
-
-    @Override
-    @Nullable
-    public List<Boolean> getBoolsOrNull(@NotNull final String path) {
-        if (has(path)) {
-            return getBools(path);
-        } else {
-            return null;
-        }
-    }
-
-    @Override
-    @NotNull
-    public String getString(@NotNull final String path) {
-        return getString(path, true);
-    }
-
-    @Override
-    @NotNull
-    public String getString(@NotNull final String path,
-                            final boolean format) {
-        String string = Objects.requireNonNullElse(getOfKnownType(path, String.class), "");
-        return format ? StringUtils.format(string) : string;
-    }
-
-    @Override
-    @Nullable
-    public String getStringOrNull(@NotNull final String path) {
-        if (has(path)) {
-            return getString(path);
-        } else {
-            return null;
-        }
-    }
-
-    @Override
-    @Nullable
-    public String getStringOrNull(@NotNull final String path,
-                                  final boolean format) {
-        if (has(path)) {
-            return getString(path, format);
-        } else {
-            return null;
-        }
-    }
-
-    @Override
-    @NotNull
-    public List<String> getStrings(@NotNull final String path) {
-        return getStrings(path, true);
-    }
-
-    @Override
-    @NotNull
-    public List<String> getStrings(@NotNull final String path,
-                                   final boolean format) {
-        List<String> strings = (List<String>) Objects.requireNonNullElse(getOfKnownType(path, Object.class), new ArrayList<>());
-
-        return format ? StringUtils.formatList(strings) : strings;
-    }
-
-    @Override
-    @Nullable
-    public List<String> getStringsOrNull(@NotNull final String path) {
-        if (has(path)) {
-            return getStrings(path);
-        } else {
-            return null;
-        }
-    }
-
-    @Override
-    public @Nullable List<String> getStringsOrNull(@NotNull final String path,
-                                                   final boolean format) {
-        if (has(path)) {
-            return getStrings(path, format);
-        } else {
-            return null;
-        }
-    }
-
-    @Override
-    public double getDouble(@NotNull final String path) {
-        return Objects.requireNonNullElse(getOfKnownType(path, Double.class), 0D);
-    }
-
-    @Override
-    @Nullable
-    public Double getDoubleOrNull(@NotNull final String path) {
-        if (has(path)) {
-            return getDouble(path);
-        } else {
-            return null;
-        }
-    }
-
-    @Override
-    @NotNull
-    public List<Double> getDoubles(@NotNull final String path) {
-        return (List<Double>) Objects.requireNonNullElse(getOfKnownType(path, Object.class), new ArrayList<>());
-    }
-
-    @Override
-    @Nullable
-    public List<Double> getDoublesOrNull(@NotNull final String path) {
-        if (has(path)) {
-            return getDoubles(path);
-        } else {
-            return null;
-        }
-    }
-
-    @Override
-    public JSONConfig clone() {
-        return new EcoJSONConfigSection(new HashMap<>(this.getValues()));
-    }
-}

eco-core/core-backend/src/main/java/com/willfp/eco/internal/config/json/EcoLoadableJSONConfig.java

@@ -1,128 +0,0 @@
-package com.willfp.eco.internal.config.json;
-
-import com.willfp.eco.core.EcoPlugin;
-import com.willfp.eco.core.config.interfaces.LoadableConfig;
-import lombok.AccessLevel;
-import lombok.Getter;
-import org.jetbrains.annotations.NotNull;
-
-import java.io.File;
-import java.io.FileNotFoundException;
-import java.io.FileOutputStream;
-import java.io.FileReader;
-import java.io.IOException;
-import java.io.InputStream;
-import java.io.OutputStream;
-import java.nio.file.Files;
-import java.nio.file.StandardOpenOption;
-import java.util.HashMap;
-
-@SuppressWarnings({"unchecked", "unused"})
-public class EcoLoadableJSONConfig extends EcoJSONConfigWrapper implements LoadableConfig {
-    @Getter
-    private final File configFile;
-    
-    @Getter(AccessLevel.PROTECTED)
-    private final EcoPlugin plugin;
-    
-    @Getter
-    private final String name;
-
-    @Getter(AccessLevel.PROTECTED)
-    private final String subDirectoryPath;
-
-    @Getter(AccessLevel.PROTECTED)
-    private final Class<?> source;
-
-    public EcoLoadableJSONConfig(@NotNull final String configName,
-                                 @NotNull final EcoPlugin plugin,
-                                 @NotNull final String subDirectoryPath,
-                                 @NotNull final Class<?> source) {
-        this.plugin = plugin;
-        this.name = configName + ".json";
-        this.source = source;
-        this.subDirectoryPath = subDirectoryPath;
-
-        File directory = new File(this.getPlugin().getDataFolder(), subDirectoryPath);
-        if (!directory.exists()) {
-            directory.mkdirs();
-        }
-
-        if (!new File(directory, this.name).exists()) {
-            createFile();
-        }
-
-        this.configFile = new File(directory, this.name);
-
-        try {
-            init(this.configFile);
-        } catch (IOException e) {
-            e.printStackTrace();
-        }
-
-        plugin.getConfigHandler().addConfig(this);
-    }
-
-    public void reloadFromFile() {
-        try {
-            init(this.configFile);
-        } catch (IOException e) {
-            e.printStackTrace();
-        }
-    }
-
-    @Override
-    public void createFile() {
-        String resourcePath = getResourcePath();
-        InputStream in = source.getResourceAsStream(resourcePath);
-
-        File outFile = new File(this.getPlugin().getDataFolder(), resourcePath);
-        int lastIndex = resourcePath.lastIndexOf('/');
-        File outDir = new File(this.getPlugin().getDataFolder(), resourcePath.substring(0, Math.max(lastIndex, 0)));
-
-        if (!outDir.exists()) {
-            outDir.mkdirs();
-        }
-
-        try {
-            if (!outFile.exists()) {
-                OutputStream out = new FileOutputStream(outFile);
-                byte[] buf = new byte[1024];
-                int len;
-                while ((len = in.read(buf)) > 0) {
-                    out.write(buf, 0, len);
-                }
-                out.close();
-                in.close();
-            }
-        } catch (IOException ignored) {
-        }
-    }
-
-    
-    @Override
-    public String getResourcePath() {
-        String resourcePath;
-
-        if (subDirectoryPath.isEmpty()) {
-            resourcePath = name;
-        } else {
-            resourcePath = subDirectoryPath + name;
-        }
-
-        return "/" + resourcePath;
-    }
-
-    
-    @Override
-    public void save() throws IOException {
-        if (configFile.delete()) {
-            Files.write(configFile.toPath(), this.toPlaintext().getBytes(), StandardOpenOption.CREATE, StandardOpenOption.WRITE);
-        }
-    }
-
-    
-    public void init(@NotNull final File file) throws FileNotFoundException {
-        super.init(this.getHandle().fromJson(new FileReader(file), HashMap.class));
-    }
-}

eco-core/core-backend/src/main/java/com/willfp/eco/internal/config/updating/EcoConfigHandler.java

@@ -1,89 +0,0 @@
-package com.willfp.eco.internal.config.updating;
-
-import com.willfp.eco.core.EcoPlugin;
-import com.willfp.eco.core.PluginDependent;
-import com.willfp.eco.core.config.interfaces.LoadableConfig;
-import com.willfp.eco.core.config.updating.ConfigHandler;
-import com.willfp.eco.core.config.updating.ConfigUpdater;
-import com.willfp.eco.internal.config.json.EcoLoadableJSONConfig;
-import com.willfp.eco.internal.config.updating.exceptions.InvalidUpdateMethodException;
-import com.willfp.eco.internal.config.yaml.EcoLoadableYamlConfig;
-import com.willfp.eco.internal.config.yaml.EcoUpdatableYamlConfig;
-import org.jetbrains.annotations.NotNull;
-import org.reflections.Reflections;
-import org.reflections.scanners.MethodAnnotationsScanner;
-
-import java.io.IOException;
-import java.lang.reflect.InvocationTargetException;
-import java.lang.reflect.Method;
-import java.lang.reflect.Modifier;
-import java.util.ArrayList;
-import java.util.List;
-
-public class EcoConfigHandler extends PluginDependent<EcoPlugin> implements ConfigHandler {
-    private final List<LoadableConfig> configs = new ArrayList<>();
-
-    private final Reflections reflections;
-
-    public EcoConfigHandler(@NotNull final EcoPlugin plugin) {
-        super(plugin);
-
-        this.reflections = new Reflections(
-                this.getPlugin().getClass().getClassLoader(),
-                new MethodAnnotationsScanner()
-        );
-    }
-
-    @Override
-    public void callUpdate() {
-        for (Method method : reflections.getMethodsAnnotatedWith(ConfigUpdater.class)) {
-            if (!Modifier.isStatic(method.getModifiers())) {
-                throw new InvalidUpdateMethodException("Update method must be static.");
-            }
-
-            try {
-                if (method.getParameterCount() == 0) {
-                    method.invoke(null);
-                } else if (method.getParameterCount() == 1) {
-                    method.invoke(null, this.getPlugin());
-                } else {
-                    throw new InvalidUpdateMethodException("Update method must have 0 parameters or a plugin parameter.");
-                }
-            } catch (IllegalAccessException | InvocationTargetException e) {
-                e.printStackTrace();
-                throw new InvalidUpdateMethodException("Update method generated an exception.");
-            }
-        }
-    }
-
-    @Override
-    public void saveAllConfigs() {
-        try {
-            for (LoadableConfig config : configs) {
-                config.save();
-            }
-        } catch (IOException e) {
-            e.printStackTrace();
-        }
-    }
-
-    @Override
-    public void addConfig(@NotNull final LoadableConfig config) {
-        configs.add(config);
-    }
-
-    @Override
-    public void updateConfigs() {
-        for (LoadableConfig config : configs) {
-            if (config instanceof EcoUpdatableYamlConfig updatableYamlConfig) {
-                updatableYamlConfig.update();
-            }
-            if (config instanceof EcoLoadableYamlConfig ecoLoadableYamlConfig) {
-                ecoLoadableYamlConfig.reloadFromFile();
-            }
-            if (config instanceof EcoLoadableJSONConfig ecoLoadableJSONConfig) {
-                ecoLoadableJSONConfig.reloadFromFile();
-            }
-        }
-    }
-}

eco-core/core-backend/src/main/java/com/willfp/eco/internal/config/updating/exceptions/InvalidUpdateMethodException.java

@@ -1,9 +0,0 @@
-package com.willfp.eco.internal.config.updating.exceptions;
-
-import org.jetbrains.annotations.NotNull;
-
-public class InvalidUpdateMethodException extends RuntimeException {
-    public InvalidUpdateMethodException(@NotNull final String message) {
-        super(message);
-    }
-}

eco-core/core-backend/src/main/java/com/willfp/eco/internal/config/yaml/EcoLoadableYamlConfig.java

@@ -1,118 +0,0 @@
-package com.willfp.eco.internal.config.yaml;
-
-import com.willfp.eco.core.EcoPlugin;
-import com.willfp.eco.core.config.interfaces.LoadableConfig;
-import com.willfp.eco.core.config.interfaces.WrappedYamlConfiguration;
-import lombok.AccessLevel;
-import lombok.Getter;
-import org.bukkit.configuration.InvalidConfigurationException;
-import org.bukkit.configuration.file.YamlConfiguration;
-import org.jetbrains.annotations.NotNull;
-
-import java.io.File;
-import java.io.FileOutputStream;
-import java.io.IOException;
-import java.io.InputStream;
-import java.io.OutputStream;
-
-public class EcoLoadableYamlConfig extends EcoYamlConfigWrapper<YamlConfiguration> implements WrappedYamlConfiguration, LoadableConfig {
-    @Getter
-    private final File configFile;
-    
-    @Getter(AccessLevel.PROTECTED)
-    private final EcoPlugin plugin;
-
-    @Getter
-    private final String name;
-    
-    @Getter(AccessLevel.PROTECTED)
-    private final String subDirectoryPath;
-
-    @Getter(AccessLevel.PROTECTED)
-    private final Class<?> source;
-
-    public EcoLoadableYamlConfig(@NotNull final String configName,
-                                 @NotNull final EcoPlugin plugin,
-                                 @NotNull final String subDirectoryPath,
-                                 @NotNull final Class<?> source) {
-        this.plugin = plugin;
-        this.name = configName + ".yml";
-        this.source = source;
-        this.subDirectoryPath = subDirectoryPath;
-
-        File directory = new File(this.getPlugin().getDataFolder(), subDirectoryPath);
-        if (!directory.exists()) {
-            directory.mkdirs();
-        }
-
-        if (!new File(directory, this.name).exists()) {
-            createFile();
-        }
-
-        this.configFile = new File(directory, this.name);
-
-        this.getPlugin().getConfigHandler().addConfig(this);
-        init(YamlConfiguration.loadConfiguration(configFile));
-    }
-
-    public void reloadFromFile() {
-        try {
-            this.getHandle().load(this.getConfigFile());
-        } catch (IOException | InvalidConfigurationException e) {
-            e.printStackTrace();
-        }
-    }
-
-    @Override
-    public void createFile() {
-        String resourcePath = getResourcePath();
-        InputStream in = source.getResourceAsStream(resourcePath);
-
-        File outFile = new File(this.getPlugin().getDataFolder(), resourcePath);
-        int lastIndex = resourcePath.lastIndexOf('/');
-        File outDir = new File(this.getPlugin().getDataFolder(), resourcePath.substring(0, Math.max(lastIndex, 0)));
-
-        if (!outDir.exists()) {
-            outDir.mkdirs();
-        }
-
-        try {
-            if (!outFile.exists()) {
-                OutputStream out = new FileOutputStream(outFile);
-                byte[] buf = new byte[1024];
-                int len;
-                while ((len = in.read(buf)) > 0) {
-                    out.write(buf, 0, len);
-                }
-                out.close();
-                in.close();
-            }
-        } catch (IOException ignored) {
-        }
-
-        plugin.getConfigHandler().addConfig(this);
-    }
-
-    @Override
-    public String getResourcePath() {
-        String resourcePath;
-
-        if (subDirectoryPath.isEmpty()) {
-            resourcePath = name;
-        } else {
-            resourcePath = subDirectoryPath + name;
-        }
-
-        return "/" + resourcePath;
-    }
-
-    @Override
-    public void save() throws IOException {
-        this.getHandle().save(this.getConfigFile());
-    }
-
-    @Override
-    public YamlConfiguration getBukkitHandle() {
-        return this.getHandle();
-    }
-}

eco-core/core-backend/src/main/java/com/willfp/eco/internal/config/yaml/EcoUpdatableYamlConfig.java

@@ -1,91 +0,0 @@
-package com.willfp.eco.internal.config.yaml;
-
-import com.willfp.eco.core.EcoPlugin;
-import org.bukkit.configuration.InvalidConfigurationException;
-import org.bukkit.configuration.file.YamlConfiguration;
-import org.jetbrains.annotations.NotNull;
-
-import java.io.BufferedReader;
-import java.io.IOException;
-import java.io.InputStream;
-import java.io.InputStreamReader;
-import java.nio.charset.StandardCharsets;
-import java.util.ArrayList;
-import java.util.Arrays;
-import java.util.List;
-
-public class EcoUpdatableYamlConfig extends EcoLoadableYamlConfig {
-    private final boolean removeUnused;
-
-    private final List<String> updateBlacklist;
-
-    public EcoUpdatableYamlConfig(@NotNull final String configName,
-                                  @NotNull final EcoPlugin plugin,
-                                  @NotNull final String subDirectoryPath,
-                                  @NotNull final Class<?> source,
-                                  final boolean removeUnused,
-                                  @NotNull final String... updateBlacklist) {
-        super(configName, plugin, subDirectoryPath, source);
-        this.removeUnused = removeUnused;
-        this.updateBlacklist = new ArrayList<>(Arrays.asList(updateBlacklist));
-        this.updateBlacklist.removeIf(String::isEmpty);
-
-        plugin.getConfigHandler().addConfig(this);
-
-        update();
-    }
-
-    public void update() {
-        super.clearCache();
-        try {
-            this.getHandle().load(this.getConfigFile());
-
-            YamlConfiguration newConfig = this.getConfigInJar();
-
-            if (newConfig.getKeys(true).equals(this.getHandle().getKeys(true))) {
-                return;
-            }
-
-            newConfig.getKeys(true).forEach((s -> {
-                if (!this.getHandle().getKeys(true).contains(s)) {
-                    if (updateBlacklist.stream().noneMatch(s::contains)) {
-                        this.getHandle().set(s, newConfig.get(s));
-                    }
-                }
-            }));
-
-            if (this.removeUnused) {
-                this.getHandle().getKeys(true).forEach((s -> {
-                    if (!newConfig.getKeys(true).contains(s)) {
-                        if (updateBlacklist.stream().noneMatch(s::contains)) {
-                            this.getHandle().set(s, null);
-                        }
-                    }
-                }));
-            }
-
-            this.getHandle().save(this.getConfigFile());
-        } catch (IOException | InvalidConfigurationException e) {
-            e.printStackTrace();
-        }
-    }
-
-    public YamlConfiguration getConfigInJar() {
-        InputStream newIn = this.getSource().getResourceAsStream(getResourcePath());
-
-        if (newIn == null) {
-            throw new NullPointerException(this.getName() + " is null?");
-        }
-
-        BufferedReader reader = new BufferedReader(new InputStreamReader(newIn, StandardCharsets.UTF_8));
-        YamlConfiguration newConfig = new YamlConfiguration();
-
-        try {
-            newConfig.load(reader);
-        } catch (IOException | InvalidConfigurationException e) {
-            e.printStackTrace();
-        }
-
-        return newConfig;
-    }
-}

eco-core/core-backend/src/main/java/com/willfp/eco/internal/config/yaml/EcoYamlConfigSection.java

@@ -1,10 +0,0 @@
-package com.willfp.eco.internal.config.yaml;
-
-import org.bukkit.configuration.ConfigurationSection;
-import org.jetbrains.annotations.NotNull;
-
-public class EcoYamlConfigSection extends EcoYamlConfigWrapper<ConfigurationSection> {
-    public EcoYamlConfigSection(@NotNull final ConfigurationSection section) {
-        this.init(section);
-    }
-}

eco-core/core-backend/src/main/java/com/willfp/eco/internal/config/yaml/EcoYamlConfigWrapper.java

@@ -1,316 +0,0 @@
-package com.willfp.eco.internal.config.yaml;
-
-import com.willfp.eco.core.config.interfaces.Config;
-import com.willfp.eco.util.StringUtils;
-import lombok.Getter;
-import org.apache.commons.lang.Validate;
-import org.bukkit.configuration.ConfigurationSection;
-import org.bukkit.configuration.file.YamlConfiguration;
-import org.jetbrains.annotations.NotNull;
-import org.jetbrains.annotations.Nullable;
-
-import java.io.StringReader;
-import java.util.ArrayList;
-import java.util.HashMap;
-import java.util.List;
-import java.util.Map;
-import java.util.Objects;
-
-@SuppressWarnings({"unchecked", "unused"})
-public class EcoYamlConfigWrapper<T extends ConfigurationSection> implements Config {
-    @Getter
-    private T handle = null;
-    
-    private final Map<String, Object> cache = new HashMap<>();
-    
-    public EcoYamlConfigWrapper() {
-
-    }
-
-    protected Config init(@NotNull final T config) {
-        this.handle = config;
-        return this;
-    }
-
-    @Override
-    public String toPlaintext() {
-        YamlConfiguration temp = new YamlConfiguration();
-        for (String key : handle.getKeys(true)) {
-            temp.set(key, handle.get(key));
-        }
-        return temp.saveToString();
-    }
-
-    @Override
-    public final void clearCache() {
-        cache.clear();
-    }
-
-    @Override
-    public boolean has(@NotNull final String path) {
-        return handle.contains(path);
-    }
-
-    @NotNull
-    @Override
-    public List<String> getKeys(final boolean deep) {
-        return new ArrayList<>(handle.getKeys(deep));
-    }
-
-    @Override
-    @Nullable
-    public Object get(@NotNull final String path) {
-        return handle.get(path);
-    }
-
-    @Override
-    public void set(@NotNull final String path,
-                    @Nullable final Object object) {
-        cache.remove(path);
-        handle.set(path, object);
-    }
-
-    @Override
-    @NotNull
-    public Config getSubsection(@NotNull final String path) {
-        Config subsection = getSubsectionOrNull(path);
-        Validate.notNull(subsection);
-        return subsection;
-    }
-
-    @Override
-    @Nullable
-    public Config getSubsectionOrNull(@NotNull final String path) {
-        if (cache.containsKey(path)) {
-            return (Config) cache.get(path);
-        } else {
-            ConfigurationSection raw = handle.getConfigurationSection(path);
-            if (raw == null) {
-                cache.put(path, null);
-            } else {
-                cache.put(path, new EcoYamlConfigSection(raw));
-            }
-            return getSubsectionOrNull(path);
-        }
-    }
-
-    @Override
-    public int getInt(@NotNull final String path) {
-        if (cache.containsKey(path)) {
-            return (int) cache.get(path);
-        } else {
-            cache.put(path, handle.getInt(path, 0));
-            return getInt(path);
-        }
-    }
-
-    @Override
-    @Nullable
-    public Integer getIntOrNull(@NotNull final String path) {
-        if (has(path)) {
-            return getInt(path);
-        } else {
-            return null;
-        }
-    }
-
-    @Override
-    public int getInt(@NotNull final String path,
-                      final int def) {
-        if (cache.containsKey(path)) {
-            return (int) cache.get(path);
-        } else {
-            cache.put(path, handle.getInt(path, def));
-            return getInt(path);
-        }
-    }
-
-    @Override
-    @NotNull
-    public List<Integer> getInts(@NotNull final String path) {
-        if (cache.containsKey(path)) {
-            return (List<Integer>) cache.get(path);
-        } else {
-            cache.put(path, has(path) ? new ArrayList<>(handle.getIntegerList(path)) : new ArrayList<>());
-            return getInts(path);
-        }
-    }
-
-    @Override
-    @Nullable
-    public List<Integer> getIntsOrNull(@NotNull final String path) {
-        if (has(path)) {
-            return getInts(path);
-        } else {
-            return null;
-        }
-    }
-
-    @Override
-    public boolean getBool(@NotNull final String path) {
-        if (cache.containsKey(path)) {
-            return (boolean) cache.get(path);
-        } else {
-            cache.put(path, handle.getBoolean(path));
-            return getBool(path);
-        }
-    }
-
-    @Override
-    @Nullable
-    public Boolean getBoolOrNull(@NotNull final String path) {
-        if (has(path)) {
-            return getBool(path);
-        } else {
-            return null;
-        }
-    }
-
-    @Override
-    @NotNull
-    public List<Boolean> getBools(@NotNull final String path) {
-        if (cache.containsKey(path)) {
-            return (List<Boolean>) cache.get(path);
-        } else {
-            cache.put(path, has(path) ? new ArrayList<>(handle.getBooleanList(path)) : new ArrayList<>());
-            return getBools(path);
-        }
-    }
-
-    @Override
-    @Nullable
-    public List<Boolean> getBoolsOrNull(@NotNull final String path) {
-        if (has(path)) {
-            return getBools(path);
-        } else {
-            return null;
-        }
-    }
-
-    @Override
-    @NotNull
-    public String getString(@NotNull final String path) {
-        if (cache.containsKey(path)) {
-            return (String) cache.get(path);
-        } else {
-            cache.put(path, StringUtils.format(Objects.requireNonNull(handle.getString(path, ""))));
-            return getString(path);
-        }
-    }
-
-    @Override
-    public @NotNull String getString(@NotNull final String path,
-                                     final boolean format) {
-        if (cache.containsKey(path)) {
-            return (String) cache.get(path);
-        } else {
-            String string = Objects.requireNonNull(handle.getString(path, ""));
-            cache.put(path, format ? StringUtils.format(string) : string);
-            return getString(path);
-        }
-    }
-
-    @Override
-    @Nullable
-    public String getStringOrNull(@NotNull final String path) {
-        if (has(path)) {
-            return getString(path);
-        } else {
-            return null;
-        }
-    }
-
-    @Override
-    public @Nullable String getStringOrNull(@NotNull final String path,
-                                            final boolean format) {
-        if (has(path)) {
-            return getString(path, format);
-        } else {
-            return null;
-        }
-    }
-
-    @Override
-    @NotNull
-    public List<String> getStrings(@NotNull final String path) {
-        return getStrings(path, true);
-    }
-
-    @Override
-    @NotNull
-    public List<String> getStrings(@NotNull final String path,
-                                   final boolean format) {
-        if (cache.containsKey(path)) {
-            return format ? StringUtils.formatList((List<String>) cache.get(path)) : (List<String>) cache.get(path);
-        } else {
-            cache.put(path, has(path) ? new ArrayList<>(handle.getStringList(path)) : new ArrayList<>());
-            return getStrings(path);
-        }
-    }
-
-    @Override
-    @Nullable
-    public List<String> getStringsOrNull(@NotNull final String path) {
-        if (has(path)) {
-            return getStrings(path);
-        } else {
-            return null;
-        }
-    }
-
-    @Override
-    public @Nullable List<String> getStringsOrNull(@NotNull final String path,
-                                                   final boolean format) {
-        if (has(path)) {
-            return getStrings(path, format);
-        } else {
-            return null;
-        }
-    }
-
-    @Override
-    public double getDouble(@NotNull final String path) {
-        if (cache.containsKey(path)) {
-            return (double) cache.get(path);
-        } else {
-            cache.put(path, handle.getDouble(path));
-            return getDouble(path);
-        }
-    }
-
-    @Override
-    @Nullable
-    public Double getDoubleOrNull(@NotNull final String path) {
-        if (has(path)) {
-            return getDouble(path);
-        } else {
-            return null;
-        }
-    }
-
-    @Override
-    @NotNull
-    public List<Double> getDoubles(@NotNull final String path) {
-        if (cache.containsKey(path)) {
-            return (List<Double>) cache.get(path);
-        } else {
-            cache.put(path, has(path) ? new ArrayList<>(handle.getDoubleList(path)) : new ArrayList<>());
-            return getDoubles(path);
-        }
-    }
-
-    @Override
-    @Nullable
-    public List<Double> getDoublesOrNull(@NotNull final String path) {
-        if (has(path)) {
-            return getDoubles(path);
-        } else {
-            return null;
-        }
-    }
-
-    @Override
-    public Config clone() {
-        return new EcoYamlConfigSection(YamlConfiguration.loadConfiguration(new StringReader(this.toPlaintext())));
-    }
-}

eco-core/core-backend/src/main/java/com/willfp/eco/internal/drops/DropManager.java

@@ -1,18 +0,0 @@
-package com.willfp.eco.internal.drops;
-
-import com.willfp.eco.core.EcoPlugin;
-import com.willfp.eco.core.config.updating.ConfigUpdater;
-import lombok.Getter;
-import lombok.experimental.UtilityClass;
-import org.jetbrains.annotations.NotNull;
-
-@UtilityClass
-public final class DropManager {
-    @Getter
-    private DropQueueType type = DropQueueType.COLLATED;
-
-    @ConfigUpdater
-    public static void update(@NotNull final EcoPlugin plugin) {
-        type = plugin.getConfigYml().getBool("use-fast-collated-drops") ? DropQueueType.COLLATED : DropQueueType.STANDARD;
-    }
-}

eco-core/core-backend/src/main/java/com/willfp/eco/internal/drops/DropQueueType.java

@@ -1,6 +0,0 @@
-package com.willfp.eco.internal.drops;
-
-public enum DropQueueType {
-    STANDARD,
-    COLLATED
-}

eco-core/core-backend/src/main/java/com/willfp/eco/internal/drops/EcoDropQueueFactory.java

@@ -1,15 +0,0 @@
-package com.willfp.eco.internal.drops;
-
-import com.willfp.eco.core.drops.DropQueueFactory;
-import com.willfp.eco.core.drops.InternalDropQueue;
-import com.willfp.eco.internal.drops.impl.EcoDropQueue;
-import com.willfp.eco.internal.drops.impl.EcoFastCollatedDropQueue;
-import org.bukkit.entity.Player;
-import org.jetbrains.annotations.NotNull;
-
-public class EcoDropQueueFactory implements DropQueueFactory {
-    @Override
-    public InternalDropQueue create(@NotNull final Player player) {
-        return DropManager.getType() == DropQueueType.COLLATED ? new EcoFastCollatedDropQueue(player) : new EcoDropQueue(player);
-    }
-}

eco-core/core-backend/src/main/java/com/willfp/eco/internal/drops/impl/EcoDropQueue.java

@@ -1,114 +0,0 @@
-package com.willfp.eco.internal.drops.impl;
-
-import com.willfp.eco.core.drops.InternalDropQueue;
-import com.willfp.eco.util.TelekinesisUtils;
-import lombok.AccessLevel;
-import lombok.Getter;
-import org.bukkit.Bukkit;
-import org.bukkit.Location;
-import org.bukkit.Material;
-import org.bukkit.World;
-import org.bukkit.entity.EntityType;
-import org.bukkit.entity.ExperienceOrb;
-import org.bukkit.entity.Player;
-import org.bukkit.event.player.PlayerExpChangeEvent;
-import org.bukkit.inventory.ItemStack;
-import org.bukkit.util.Vector;
-import org.jetbrains.annotations.NotNull;
-
-import java.util.ArrayList;
-import java.util.Collection;
-import java.util.HashMap;
-import java.util.List;
-
-public class EcoDropQueue implements InternalDropQueue {
-    @Getter(AccessLevel.PROTECTED)
-    private final List<ItemStack> items;
-    
-    @Getter(AccessLevel.PROTECTED)
-    private int xp;
-    
-    @Getter(AccessLevel.PROTECTED)
-    private final Player player;
-
-    @Getter(AccessLevel.PROTECTED)
-    private Location loc;
-    
-    @Getter(AccessLevel.PROTECTED)
-    private boolean hasTelekinesis = false;
-
-    public EcoDropQueue(@NotNull final Player player) {
-        this.items = new ArrayList<>();
-        this.xp = 0;
-        this.player = player;
-        this.loc = player.getLocation();
-    }
-
-    @Override
-    public InternalDropQueue addItem(@NotNull final ItemStack item) {
-        this.items.add(item);
-        return this;
-    }
-
-    @Override
-    public InternalDropQueue addItems(@NotNull final Collection<ItemStack> itemStacks) {
-        this.items.addAll(itemStacks);
-        return this;
-    }
-
-    @Override
-    public InternalDropQueue addXP(final int amount) {
-        this.xp += amount;
-        return this;
-    }
-
-    @Override
-    public InternalDropQueue setLocation(@NotNull final Location location) {
-        this.loc = location;
-        return this;
-    }
-
-    @Override
-    public InternalDropQueue forceTelekinesis() {
-        this.hasTelekinesis = true;
-        return this;
-    }
-
-    @Override
-    public void push() {
-        if (!hasTelekinesis) {
-            hasTelekinesis = TelekinesisUtils.testPlayer(player);
-        }
-
-        World world = loc.getWorld();
-        assert world != null;
-        loc = loc.add(0.5, 0.5, 0.5);
-
-        items.removeIf(itemStack -> itemStack.getType() == Material.AIR);
-        if (items.isEmpty()) {
-            return;
-        }
-
-        if (hasTelekinesis) {
-            HashMap<Integer, ItemStack> leftover = player.getInventory().addItem(items.toArray(new ItemStack[0]));
-            for (ItemStack drop : leftover.values()) {
-                world.dropItem(loc, drop).setVelocity(new Vector());
-            }
-            if (xp > 0) {
-                PlayerExpChangeEvent event = new PlayerExpChangeEvent(player, xp);
-                Bukkit.getPluginManager().callEvent(event);
-                ExperienceOrb orb = (ExperienceOrb) world.spawnEntity(player.getLocation().add(0, 0.2, 0), EntityType.EXPERIENCE_ORB);
-                orb.setVelocity(new Vector(0, 0, 0));
-                orb.setExperience(event.getAmount());
-            }
-        } else {
-            for (ItemStack drop : items) {
-                world.dropItem(loc, drop).setVelocity(new Vector());
-            }
-            if (xp > 0) {
-                ExperienceOrb orb = (ExperienceOrb) world.spawnEntity(loc, EntityType.EXPERIENCE_ORB);
-                orb.setExperience(xp);
-            }
-        }
-    }
-}

eco-core/core-backend/src/main/java/com/willfp/eco/internal/drops/impl/EcoFastCollatedDropQueue.java

@@ -1,61 +0,0 @@
-package com.willfp.eco.internal.drops.impl;
-
-import lombok.Getter;
-import lombok.Setter;
-import lombok.ToString;
-import lombok.experimental.Accessors;
-import org.bukkit.Location;
-import org.bukkit.entity.Player;
-import org.bukkit.inventory.ItemStack;
-import org.jetbrains.annotations.NotNull;
-
-import java.util.List;
-import java.util.Map;
-import java.util.concurrent.ConcurrentHashMap;
-
-public class EcoFastCollatedDropQueue extends EcoDropQueue {
-    public static final Map<Player, CollatedDrops> COLLATED_MAP = new ConcurrentHashMap<>();
-
-    public EcoFastCollatedDropQueue(@NotNull final Player player) {
-        super(player);
-    }
-
-    @Override
-    public void push() {
-        CollatedDrops fetched = COLLATED_MAP.get(getPlayer());
-        CollatedDrops collatedDrops = fetched == null ? new CollatedDrops(getItems(), getLoc(), getXp()) : fetched.addDrops(getItems()).setLocation(getLoc()).addXp(getXp());
-        COLLATED_MAP.put(this.getPlayer(), collatedDrops);
-    }
-
-    @ToString
-    public static final class CollatedDrops {
-        @Getter
-        private final List<ItemStack> drops;
-
-        @Getter
-        @Setter
-        @Accessors(chain = true)
-        private Location location;
-
-        @Getter
-        private int xp;
-
-        private CollatedDrops(@NotNull final List<ItemStack> drops,
-                              @NotNull final Location location,
-                              final int xp) {
-            this.drops = drops;
-            this.location = location;
-            this.xp = xp;
-        }
-
-        public CollatedDrops addDrops(@NotNull final List<ItemStack> toAdd) {
-            drops.addAll(toAdd);
-            return this;
-        }
-
-        public CollatedDrops addXp(final int xp) {
-            this.xp += xp;
-            return this;
-        }
-    }
-}

eco-core/core-backend/src/main/java/com/willfp/eco/internal/events/EcoEventManager.java

@@ -1,32 +0,0 @@
-package com.willfp.eco.internal.events;
-
-import com.willfp.eco.core.EcoPlugin;
-import com.willfp.eco.core.PluginDependent;
-import com.willfp.eco.core.events.EventManager;
-import org.bukkit.Bukkit;
-import org.bukkit.event.HandlerList;
-import org.bukkit.event.Listener;
-import org.jetbrains.annotations.ApiStatus;
-import org.jetbrains.annotations.NotNull;
-
-public class EcoEventManager extends PluginDependent<EcoPlugin> implements EventManager {
-    @ApiStatus.Internal
-    public EcoEventManager(@NotNull final EcoPlugin plugin) {
-        super(plugin);
-    }
-
-    @Override
-    public void registerListener(@NotNull final Listener listener) {
-        Bukkit.getPluginManager().registerEvents(listener, this.getPlugin());
-    }
-
-    @Override
-    public void unregisterListener(@NotNull final Listener listener) {
-        HandlerList.unregisterAll(listener);
-    }
-
-    @Override
-    public void unregisterAllListeners() {
-        HandlerList.unregisterAll(this.getPlugin());
-    }
-}

eco-core/core-backend/src/main/java/com/willfp/eco/internal/extensions/EcoExtensionLoader.java

@@ -1,138 +0,0 @@
-package com.willfp.eco.internal.extensions;
-
-
-import com.willfp.eco.core.EcoPlugin;
-import com.willfp.eco.core.PluginDependent;
-import com.willfp.eco.core.config.interfaces.Config;
-import com.willfp.eco.core.config.yaml.YamlTransientConfig;
-import com.willfp.eco.core.extensions.Extension;
-import com.willfp.eco.core.extensions.ExtensionLoader;
-import com.willfp.eco.core.extensions.ExtensionMetadata;
-import com.willfp.eco.core.extensions.MalformedExtensionException;
-import org.bukkit.configuration.file.YamlConfiguration;
-import org.jetbrains.annotations.NotNull;
-
-import java.io.File;
-import java.io.IOException;
-import java.io.InputStream;
-import java.io.InputStreamReader;
-import java.net.MalformedURLException;
-import java.net.URL;
-import java.net.URLClassLoader;
-import java.util.HashMap;
-import java.util.Map;
-import java.util.Set;
-
-public class EcoExtensionLoader extends PluginDependent<EcoPlugin> implements ExtensionLoader {
-    private final Map<Extension, ClassLoader> extensions = new HashMap<>();
-
-    public EcoExtensionLoader(@NotNull final EcoPlugin plugin) {
-        super(plugin);
-    }
-
-    @Override
-    public void loadExtensions() {
-        File dir = new File(this.getPlugin().getDataFolder(), "/extensions");
-        if (!dir.exists()) {
-            dir.mkdirs();
-        }
-
-        File[] extensionJars = dir.listFiles();
-
-        if (extensionJars == null) {
-            return;
-        }
-
-        for (File extensionJar : extensionJars) {
-            if (!extensionJar.isFile()) {
-                continue;
-            }
-
-            try {
-                loadExtension(extensionJar);
-            } catch (MalformedExtensionException e) {
-                this.getPlugin().getLogger().warning(extensionJar.getName() + " caused an error!");
-            }
-        }
-    }
-
-    private void loadExtension(@NotNull final File extensionJar) throws MalformedExtensionException {
-        URL url = null;
-        try {
-            url = extensionJar.toURI().toURL();
-        } catch (MalformedURLException e) {
-            e.printStackTrace();
-        }
-
-        ClassLoader classLoader = new URLClassLoader(new URL[]{url}, this.getPlugin().getClass().getClassLoader());
-
-        InputStream ymlIn = classLoader.getResourceAsStream("extension.yml");
-
-        if (ymlIn == null) {
-            throw new MalformedExtensionException("No extension.yml found in " + extensionJar.getName());
-        }
-
-        Config extensionYml = new YamlTransientConfig(YamlConfiguration.loadConfiguration(new InputStreamReader(ymlIn)));
-
-        String mainClass = extensionYml.getStringOrNull("main");
-        String name = extensionYml.getStringOrNull("name");
-        String version = extensionYml.getStringOrNull("version");
-        String author = extensionYml.getStringOrNull("author");
-
-        if (mainClass == null) {
-            throw new MalformedExtensionException("Invalid extension.yml found in " + extensionJar.getName());
-        }
-
-        if (name == null) {
-            this.getPlugin().getLogger().warning(extensionJar.getName() + " doesn't have a name!");
-            name = "Unnamed Extension " + extensionJar.getName();
-        }
-
-        if (version == null) {
-            this.getPlugin().getLogger().warning(extensionJar.getName() + " doesn't have a version!");
-            version = "1.0.0";
-        }
-
-        if (author == null) {
-            this.getPlugin().getLogger().warning(extensionJar.getName() + " doesn't have an author!");
-            author = "Unnamed Author";
-        }
-
-        ExtensionMetadata metadata = new ExtensionMetadata(version, name, author);
-
-        Class<?> cls;
-        Object object = null;
-        try {
-            cls = classLoader.loadClass(mainClass);
-            object = cls.getConstructor(EcoPlugin.class).newInstance(this.getPlugin());
-        } catch (ReflectiveOperationException e) {
-            e.printStackTrace();
-        }
-
-        if (!(object instanceof Extension extension)) {
-            throw new MalformedExtensionException(extensionJar.getName() + " is invalid");
-        }
-
-        extension.setMetadata(metadata);
-        extension.enable();
-        extensions.put(extension, classLoader);
-    }
-
-    @Override
-    public void unloadExtensions() {
-        extensions.keySet().forEach(Extension::disable);
-        for (ClassLoader loader : extensions.values()) {
-            try {
-                ((URLClassLoader) loader).close();
-            } catch (IOException e) {
-                // Do nothing.
-            }
-        }
-        extensions.clear();
-    }
-
-    @Override
-    public Set<Extension> getLoadedExtensions() {
-        return extensions.keySet();
-    }
-}

eco-core/core-backend/src/main/java/com/willfp/eco/internal/factory/EcoMetadataValueFactory.java

@@ -1,18 +0,0 @@
-package com.willfp.eco.internal.factory;
-
-import com.willfp.eco.core.EcoPlugin;
-import com.willfp.eco.core.PluginDependent;
-import com.willfp.eco.core.factory.MetadataValueFactory;
-import org.bukkit.metadata.FixedMetadataValue;
-import org.jetbrains.annotations.NotNull;
-
-public class EcoMetadataValueFactory extends PluginDependent<EcoPlugin> implements MetadataValueFactory {
-    public EcoMetadataValueFactory(@NotNull final EcoPlugin plugin) {
-        super(plugin);
-    }
-
-    @Override
-    public FixedMetadataValue create(@NotNull final Object value) {
-        return new FixedMetadataValue(this.getPlugin(), value);
-    }
-}

eco-core/core-backend/src/main/java/com/willfp/eco/internal/factory/EcoNamespacedKeyFactory.java

@@ -1,18 +0,0 @@
-package com.willfp.eco.internal.factory;
-
-import com.willfp.eco.core.EcoPlugin;
-import com.willfp.eco.core.PluginDependent;
-import com.willfp.eco.core.factory.NamespacedKeyFactory;
-import org.bukkit.NamespacedKey;
-import org.jetbrains.annotations.NotNull;
-
-public class EcoNamespacedKeyFactory extends PluginDependent<EcoPlugin> implements NamespacedKeyFactory {
-    public EcoNamespacedKeyFactory(@NotNull final EcoPlugin plugin) {
-        super(plugin);
-    }
-
-    @Override
-    public NamespacedKey create(@NotNull final String key) {
-        return new NamespacedKey(this.getPlugin(), key);
-    }
-}

eco-core/core-backend/src/main/java/com/willfp/eco/internal/factory/EcoRunnableFactory.java

@@ -1,26 +0,0 @@
-package com.willfp.eco.internal.factory;
-
-import com.willfp.eco.core.EcoPlugin;
-import com.willfp.eco.core.PluginDependent;
-import com.willfp.eco.core.factory.RunnableFactory;
-import com.willfp.eco.core.scheduling.RunnableTask;
-import com.willfp.eco.internal.scheduling.EcoRunnableTask;
-import org.jetbrains.annotations.NotNull;
-
-import java.util.function.Consumer;
-
-public class EcoRunnableFactory extends PluginDependent<EcoPlugin> implements RunnableFactory {
-    public EcoRunnableFactory(@NotNull final EcoPlugin plugin) {
-        super(plugin);
-    }
-
-    @Override
-    public RunnableTask create(@NotNull final Consumer<RunnableTask> consumer) {
-        return new EcoRunnableTask(this.getPlugin()) {
-            @Override
-            public void run() {
-                consumer.accept(this);
-            }
-        };
-    }
-}

eco-core/core-backend/src/main/java/com/willfp/eco/internal/gui/EcoGUIFactory.java

@@ -1,24 +0,0 @@
-package com.willfp.eco.internal.gui;
-
-import com.willfp.eco.core.gui.GUIFactory;
-import com.willfp.eco.core.gui.menu.MenuBuilder;
-import com.willfp.eco.core.gui.slot.SlotBuilder;
-import com.willfp.eco.internal.gui.menu.EcoMenuBuilder;
-import com.willfp.eco.internal.gui.slot.EcoSlotBuilder;
-import org.bukkit.entity.Player;
-import org.bukkit.inventory.ItemStack;
-import org.jetbrains.annotations.NotNull;
-
-import java.util.function.Function;
-
-public class EcoGUIFactory implements GUIFactory {
-    @Override
-    public SlotBuilder createSlotBuilder(@NotNull final Function<Player, ItemStack> provider) {
-        return new EcoSlotBuilder(provider);
-    }
-
-    @Override
-    public MenuBuilder createMenuBuilder(final int rows) {
-        return new EcoMenuBuilder(rows);
-    }
-}

eco-core/core-backend/src/main/java/com/willfp/eco/internal/gui/menu/EcoMenu.java

@@ -1,98 +0,0 @@
-package com.willfp.eco.internal.gui.menu;
-
-import com.willfp.eco.core.gui.menu.Menu;
-import com.willfp.eco.core.gui.slot.FillerSlot;
-import com.willfp.eco.core.gui.slot.Slot;
-import com.willfp.eco.internal.gui.slot.EcoFillerSlot;
-import com.willfp.eco.util.StringUtils;
-import lombok.Getter;
-import org.bukkit.Bukkit;
-import org.bukkit.entity.Player;
-import org.bukkit.event.inventory.InventoryCloseEvent;
-import org.bukkit.inventory.Inventory;
-import org.bukkit.inventory.ItemStack;
-import org.bukkit.inventory.meta.ItemMeta;
-import org.jetbrains.annotations.NotNull;
-
-import java.util.List;
-import java.util.function.Consumer;
-
-public class EcoMenu implements Menu {
-    @Getter
-    private final int rows;
-
-    private final List<List<Slot>> slots;
-
-    @Getter
-    private final String title;
-
-    private final Consumer<InventoryCloseEvent> onClose;
-
-    public EcoMenu(final int rows,
-                   @NotNull final List<List<Slot>> slots,
-                   @NotNull final String title,
-                   @NotNull final Consumer<InventoryCloseEvent> onClose) {
-        this.rows = rows;
-        this.slots = slots;
-        this.title = title;
-        this.onClose = onClose;
-    }
-
-    @Override
-    public Slot getSlot(final int row,
-                        final int column) {
-        if (row < 1 || row > this.rows) {
-            throw new IllegalArgumentException("Invalid row number!");
-        }
-
-        if (column < 1 || column > 9) {
-            throw new IllegalArgumentException("Invalid column number!");
-        }
-
-        Slot slot = slots.get(row - 1).get(column - 1);
-        if (slot instanceof FillerSlot fillerSlot) {
-            slots.get(row - 1).set(
-                    column - 1,
-                    new EcoFillerSlot(fillerSlot.getItemStack())
-            );
-
-            return getSlot(row, column);
-        }
-
-        return slots.get(row - 1).get(column - 1);
-    }
-
-    @Override
-    public Inventory open(@NotNull final Player player) {
-        Inventory inventory = Bukkit.createInventory(null, rows * 9, title);
-        int i = 0;
-        for (List<Slot> row : slots) {
-            for (Slot item : row) {
-                if (i == rows * 9) {
-                    break;
-                }
-                ItemStack slotItem = item.getItemStack(player);
-                ItemMeta meta = slotItem.getItemMeta();
-                if (meta != null) {
-                    List<String> lore = meta.getLore();
-                    if (lore != null) {
-                        lore.replaceAll(s -> StringUtils.format(s, player));
-                        meta.setLore(lore);
-                    }
-                    slotItem.setItemMeta(meta);
-                }
-                inventory.setItem(i, slotItem);
-                i++;
-            }
-        }
-
-
-        player.openInventory(inventory);
-        MenuHandler.registerMenu(inventory, this);
-        return inventory;
-    }
-
-    public void handleClose(@NotNull final InventoryCloseEvent event) {
-        onClose.accept(event);
-    }
-}

eco-core/core-backend/src/main/java/com/willfp/eco/internal/gui/menu/EcoMenuBuilder.java

@@ -1,92 +0,0 @@
-package com.willfp.eco.internal.gui.menu;
-
-import com.willfp.eco.core.gui.menu.Menu;
-import com.willfp.eco.core.gui.menu.MenuBuilder;
-import com.willfp.eco.core.gui.slot.FillerMask;
-import com.willfp.eco.core.gui.slot.Slot;
-import com.willfp.eco.internal.gui.slot.EcoFillerSlot;
-import com.willfp.eco.util.ListUtils;
-import com.willfp.eco.util.StringUtils;
-import org.bukkit.Material;
-import org.bukkit.event.inventory.InventoryCloseEvent;
-import org.bukkit.inventory.ItemStack;
-import org.jetbrains.annotations.NotNull;
-
-import java.util.List;
-import java.util.function.Consumer;
-
-public class EcoMenuBuilder implements MenuBuilder {
-    private final int rows;
-
-    private String title = "Menu";
-
-    private List<List<Slot>> maskSlots;
-
-    private final List<List<Slot>> slots;
-
-    private Consumer<InventoryCloseEvent> onClose = (event) -> {
-    };
-
-    public EcoMenuBuilder(final int rows) {
-        this.rows = rows;
-        this.slots = ListUtils.create2DList(rows, 9);
-        this.maskSlots = ListUtils.create2DList(rows, 9);
-    }
-
-    @Override
-    public MenuBuilder setTitle(@NotNull final String title) {
-        this.title = StringUtils.format(title);
-        return this;
-    }
-
-    @Override
-    public MenuBuilder setSlot(final int row,
-                                final int column,
-                                @NotNull final Slot slot) {
-        if (row < 1 || row > this.rows) {
-            throw new IllegalArgumentException("Invalid row number!");
-        }
-
-        if (column < 1 || column > 9) {
-            throw new IllegalArgumentException("Invalid column number!");
-        }
-
-        slots.get(row - 1).set(column - 1, slot);
-        return this;
-    }
-
-    @Override
-    public MenuBuilder setMask(@NotNull final FillerMask mask) {
-        this.maskSlots = mask.getMask();
-        return this;
-    }
-
-    @Override
-    public MenuBuilder onClose(@NotNull final Consumer<InventoryCloseEvent> action) {
-        this.onClose = action;
-        return this;
-    }
-
-    @Override
-    public Menu build() {
-        List<List<Slot>> finalSlots = maskSlots;
-        for (int i = 0; i < slots.size(); i++) {
-            for (int j = 0; j < slots.get(i).size(); j++) {
-                Slot slot = slots.get(i).get(j);
-                if (slot != null) {
-                    finalSlots.get(i).set(j, slot);
-                }
-            }
-        }
-
-        for (List<Slot> finalSlot : finalSlots) {
-            for (int j = 0; j < finalSlot.size(); j++) {
-                if (finalSlot.get(j) == null) {
-                    finalSlot.set(j, new EcoFillerSlot(new ItemStack(Material.AIR)));
-                }
-            }
-        }
-
-        return new EcoMenu(rows, finalSlots, title, onClose);
-    }
-}

eco-core/core-backend/src/main/java/com/willfp/eco/internal/gui/menu/MenuHandler.java

@@ -1,29 +0,0 @@
-package com.willfp.eco.internal.gui.menu;
-
-import com.willfp.eco.core.gui.menu.Menu;
-import lombok.experimental.UtilityClass;
-import org.bukkit.inventory.Inventory;
-import org.jetbrains.annotations.NotNull;
-import org.jetbrains.annotations.Nullable;
-
-import java.util.HashMap;
-import java.util.Map;
-
-@UtilityClass
-public class MenuHandler {
-    private static final Map<Inventory, Menu> MENUS = new HashMap<>();
-
-    public void registerMenu(@NotNull final Inventory inventory,
-                             @NotNull final Menu menu) {
-        MENUS.put(inventory, menu);
-    }
-
-    public void unregisterMenu(@NotNull final Inventory inventory) {
-        MENUS.remove(inventory);
-    }
-
-    @Nullable
-    public Menu getMenu(@NotNull final Inventory inventory) {
-        return MENUS.get(inventory);
-    }
-}

eco-core/core-backend/src/main/java/com/willfp/eco/internal/gui/slot/EcoFillerSlot.java

@@ -1,10 +0,0 @@
-package com.willfp.eco.internal.gui.slot;
-
-import org.bukkit.inventory.ItemStack;
-import org.jetbrains.annotations.NotNull;
-
-public class EcoFillerSlot extends EcoSlot {
-    public EcoFillerSlot(@NotNull final ItemStack itemStack) {
-        super((player) -> itemStack, null, null, null, null, null);
-    }
-}

eco-core/core-backend/src/main/java/com/willfp/eco/internal/gui/slot/EcoSlot.java

@@ -1,63 +0,0 @@
-package com.willfp.eco.internal.gui.slot;
-
-import com.willfp.eco.core.gui.slot.Slot;
-import lombok.Getter;
-import org.bukkit.entity.Player;
-import org.bukkit.event.inventory.InventoryClickEvent;
-import org.bukkit.inventory.ItemStack;
-import org.jetbrains.annotations.NotNull;
-import org.jetbrains.annotations.Nullable;
-
-import java.util.function.BiConsumer;
-import java.util.function.Function;
-
-public class EcoSlot implements Slot {
-    @Getter
-    private final Function<Player, ItemStack> provider;
-
-    private final BiConsumer<InventoryClickEvent, Slot> onLeftClick;
-
-    private final BiConsumer<InventoryClickEvent, Slot> onRightClick;
-
-    private final BiConsumer<InventoryClickEvent, Slot> onShiftLeftClick;
-
-    private final BiConsumer<InventoryClickEvent, Slot> onShiftRightClick;
-
-    private final BiConsumer<InventoryClickEvent, Slot> onMiddleClick;
-
-    public EcoSlot(@NotNull final Function<Player, ItemStack> provider,
-                   @Nullable final BiConsumer<InventoryClickEvent, Slot> onLeftClick,
-                   @Nullable final BiConsumer<InventoryClickEvent, Slot> onRightClick,
-                   @Nullable final BiConsumer<InventoryClickEvent, Slot> onShiftLeftClick,
-                   @Nullable final BiConsumer<InventoryClickEvent, Slot> onShiftRightClick,
-                   @Nullable final BiConsumer<InventoryClickEvent, Slot> onMiddleClick) {
-        this.provider = provider;
-        this.onLeftClick = onLeftClick == null ? ((event, slot) -> {
-        }) : onLeftClick;
-        this.onRightClick = onRightClick == null ? ((event, slot) -> {
-        }) : onRightClick;
-        this.onShiftLeftClick = onShiftLeftClick == null ? ((event, slot) -> {
-        }) : onShiftLeftClick;
-        this.onShiftRightClick = onShiftRightClick == null ? ((event, slot) -> {
-        }) : onShiftRightClick;
-        this.onMiddleClick = onMiddleClick == null ? ((event, slot) -> {
-        }) : onMiddleClick;
-    }
-
-    public void handleInventoryClick(@NotNull final InventoryClickEvent event) {
-        switch (event.getClick()) {
-            case LEFT -> this.onLeftClick.accept(event, this);
-            case RIGHT -> this.onRightClick.accept(event, this);
-            case SHIFT_LEFT -> this.onShiftLeftClick.accept(event, this);
-            case SHIFT_RIGHT -> this.onShiftRightClick.accept(event, this);
-            case MIDDLE -> this.onMiddleClick.accept(event, this);
-            default -> {
-            }
-        }
-    }
-
-    @Override
-    public ItemStack getItemStack(@NotNull final Player player) {
-        return provider.apply(player);
-    }
-}

eco-core/core-backend/src/main/java/com/willfp/eco/internal/gui/slot/EcoSlotBuilder.java

@@ -1,58 +0,0 @@
-package com.willfp.eco.internal.gui.slot;
-
-import com.willfp.eco.core.gui.slot.Slot;
-import com.willfp.eco.core.gui.slot.SlotBuilder;
-import org.bukkit.entity.Player;
-import org.bukkit.event.inventory.InventoryClickEvent;
-import org.bukkit.inventory.ItemStack;
-import org.jetbrains.annotations.NotNull;
-
-import java.util.function.BiConsumer;
-import java.util.function.Function;
-
-public class EcoSlotBuilder implements SlotBuilder {
-    private final Function<Player, ItemStack> provider;
-
-    private BiConsumer<InventoryClickEvent, Slot> onLeftClick = null;
-
-    private BiConsumer<InventoryClickEvent, Slot> onRightClick = null;
-
-    private BiConsumer<InventoryClickEvent, Slot> onShiftLeftClick = null;
-
-    private BiConsumer<InventoryClickEvent, Slot> onShiftRightClick = null;
-
-    private BiConsumer<InventoryClickEvent, Slot> onMiddleClick = null;
-
-    public EcoSlotBuilder(@NotNull final Function<Player, ItemStack> provider) {
-        this.provider = provider;
-    }
-
-    public SlotBuilder onLeftClick(@NotNull final BiConsumer<InventoryClickEvent, Slot> action) {
-        this.onLeftClick = action;
-        return this;
-    }
-
-    public SlotBuilder onRightClick(@NotNull final BiConsumer<InventoryClickEvent, Slot> action) {
-        this.onRightClick = action;
-        return this;
-    }
-
-    public SlotBuilder onShiftLeftClick(@NotNull final BiConsumer<InventoryClickEvent, Slot> action) {
-        this.onShiftLeftClick = action;
-        return this;
-    }
-
-    public SlotBuilder onShiftRightClick(@NotNull final BiConsumer<InventoryClickEvent, Slot> action) {
-        this.onShiftRightClick = action;
-        return this;
-    }
-
-    public SlotBuilder onMiddleClick(@NotNull final BiConsumer<InventoryClickEvent, Slot> action) {
-        this.onMiddleClick = action;
-        return this;
-    }
-
-    public Slot build() {
-        return new EcoSlot(provider, onLeftClick, onRightClick, onShiftLeftClick, onShiftRightClick, onMiddleClick);
-    }
-}

eco-core/core-backend/src/main/java/com/willfp/eco/internal/integrations/PlaceholderIntegrationPAPI.java

@@ -1,65 +0,0 @@
-package com.willfp.eco.internal.integrations;
-
-import com.willfp.eco.core.EcoPlugin;
-import com.willfp.eco.core.integrations.placeholder.PlaceholderIntegration;
-import com.willfp.eco.core.integrations.placeholder.PlaceholderManager;
-import me.clip.placeholderapi.PlaceholderAPI;
-import me.clip.placeholderapi.expansion.PlaceholderExpansion;
-import org.bukkit.entity.Player;
-import org.jetbrains.annotations.NotNull;
-import org.jetbrains.annotations.Nullable;
-
-public class PlaceholderIntegrationPAPI extends PlaceholderExpansion implements PlaceholderIntegration {
-    private final EcoPlugin plugin;
-
-    public PlaceholderIntegrationPAPI(@NotNull final EcoPlugin plugin) {
-        this.plugin = plugin;
-    }
-
-    @Override
-    public boolean persist() {
-        return true;
-    }
-
-    @Override
-    public boolean canRegister() {
-        return true;
-    }
-
-    @Override
-    public @NotNull String getAuthor() {
-        return String.join(", ", plugin.getDescription().getAuthors());
-    }
-
-    @Override
-    public @NotNull String getIdentifier() {
-        return plugin.getDescription().getName().toLowerCase();
-    }
-
-    @Override
-    public @NotNull String getVersion() {
-        return plugin.getDescription().getVersion();
-    }
-
-    @Override
-    public String onPlaceholderRequest(@Nullable final Player player,
-                                       @NotNull final String identifier) {
-        return PlaceholderManager.getResult(player, identifier);
-    }
-
-    @Override
-    public void registerIntegration() {
-        this.register();
-    }
-
-    @Override
-    public String getPluginName() {
-        return "PlaceholderAPI";
-    }
-
-    @Override
-    public String translate(@NotNull final String text,
-                            @Nullable final Player player) {
-        return PlaceholderAPI.setPlaceholders(player, text);
-    }
-}

eco-core/core-backend/src/main/java/com/willfp/eco/internal/logging/EcoLogger.java

@@ -1,32 +0,0 @@
-package com.willfp.eco.internal.logging;
-
-import com.willfp.eco.core.EcoPlugin;
-import com.willfp.eco.util.StringUtils;
-import org.jetbrains.annotations.NotNull;
-
-import java.util.logging.Level;
-import java.util.logging.Logger;
-
-public class EcoLogger extends Logger {
-    public EcoLogger(@NotNull final EcoPlugin plugin) {
-        super(plugin.getName(), (String) null);
-        String prefix = plugin.getDescription().getPrefix();
-        this.setParent(plugin.getServer().getLogger());
-        this.setLevel(Level.ALL);
-    }
-
-    @Override
-    public void info(@NotNull final String msg) {
-        super.info(StringUtils.format(msg));
-    }
-
-    @Override
-    public void warning(@NotNull final String msg) {
-        super.warning(StringUtils.format(msg));
-    }
-
-    @Override
-    public void severe(@NotNull final String msg) {
-        super.severe(StringUtils.format(msg));
-    }
-}

eco-core/core-backend/src/main/java/com/willfp/eco/internal/proxy/EcoProxyFactory.java

@@ -1,103 +0,0 @@
-package com.willfp.eco.internal.proxy;
-
-import com.willfp.eco.core.EcoPlugin;
-import com.willfp.eco.core.PluginDependent;
-import com.willfp.eco.core.proxy.AbstractProxy;
-import com.willfp.eco.core.proxy.ProxyConstants;
-import com.willfp.eco.core.proxy.ProxyFactory;
-import com.willfp.eco.core.proxy.exceptions.ProxyError;
-import com.willfp.eco.core.proxy.exceptions.UnsupportedVersionException;
-import org.apache.commons.lang.Validate;
-import org.jetbrains.annotations.NotNull;
-import org.jetbrains.annotations.Nullable;
-
-import java.io.IOException;
-import java.net.URLClassLoader;
-import java.util.Arrays;
-import java.util.IdentityHashMap;
-import java.util.List;
-import java.util.Map;
-
-public class EcoProxyFactory extends PluginDependent<EcoPlugin> implements ProxyFactory {
-    private static final List<String> SUPPORTED_VERSIONS = Arrays.asList(
-            "v1_16_R3",
-            "v1_17_R1"
-    );
-
-    private final ClassLoader proxyClassLoader;
-
-    private final Map<Class<? extends AbstractProxy>, AbstractProxy> cache = new IdentityHashMap<>();
-
-    public EcoProxyFactory(@NotNull final EcoPlugin plugin) {
-        super(plugin);
-
-        Validate.isTrue(
-                !plugin.getProxyPackage().equalsIgnoreCase(""),
-                "Specified plugin has no proxy support!"
-        );
-
-        this.proxyClassLoader = plugin.getClass().getClassLoader();
-    }
-
-    @Override
-    public <T extends AbstractProxy> @NotNull T getProxy(@NotNull final Class<T> proxyClass) {
-        try {
-            T cachedProxy = attemptCache(proxyClass);
-            if (cachedProxy != null) {
-                return cachedProxy;
-            }
-
-            String className = this.getPlugin().getProxyPackage() + "." + ProxyConstants.NMS_VERSION + "." + proxyClass.getSimpleName().replace("Proxy", "");
-            Class<?> clazz = this.getPlugin().getClass().getClassLoader().loadClass(className);
-            Object instance = clazz.getDeclaredConstructor().newInstance();
-            if (proxyClass.isAssignableFrom(clazz) && proxyClass.isInstance(instance)) {
-                T proxy = proxyClass.cast(instance);
-                cache.put(proxyClass, proxy);
-                return proxy;
-            }
-        } catch (Exception e) {
-            throwError(e);
-        }
-
-        throwError(new IllegalArgumentException());
-
-        throw new RuntimeException("Something went wrong.");
-    }
-
-    private void throwError(@Nullable final Exception e) {
-        if (e != null) {
-            e.printStackTrace();
-        }
-
-        if (!SUPPORTED_VERSIONS.contains(ProxyConstants.NMS_VERSION)) {
-            throw new UnsupportedVersionException("You're running an unsupported server version: " + ProxyConstants.NMS_VERSION);
-        } else {
-            throw new ProxyError("Error with proxies - here's a stacktrace. Only god can help you now.");
-        }
-    }
-
-    private <T extends AbstractProxy> T attemptCache(@NotNull final Class<T> proxyClass) {
-        Object proxy = cache.get(proxyClass);
-        if (proxy == null) {
-            return null;
-        }
-
-        if (proxyClass.isInstance(proxy)) {
-            return proxyClass.cast(proxy);
-        }
-
-        return null;
-    }
-
-    public void clean() {
-        try {
-            if (proxyClassLoader instanceof URLClassLoader urlClassLoader) {
-                urlClassLoader.close();
-            }
-        } catch (IOException e) {
-            e.printStackTrace();
-        }
-
-        cache.clear();
-    }
-}

eco-core/core-backend/src/main/java/com/willfp/eco/internal/scheduling/EcoRunnableTask.java

@@ -1,57 +0,0 @@
-package com.willfp.eco.internal.scheduling;
-
-import com.willfp.eco.core.EcoPlugin;
-import com.willfp.eco.core.scheduling.RunnableTask;
-import org.bukkit.scheduler.BukkitRunnable;
-import org.bukkit.scheduler.BukkitTask;
-import org.jetbrains.annotations.ApiStatus;
-import org.jetbrains.annotations.NotNull;
-
-public abstract class EcoRunnableTask extends BukkitRunnable implements RunnableTask {
-    private final EcoPlugin plugin;
-
-    @ApiStatus.Internal
-    public EcoRunnableTask(@NotNull final EcoPlugin plugin) {
-        this.plugin = plugin;
-    }
-
-    protected final EcoPlugin getPlugin() {
-        return this.plugin;
-    }
-
-    @Override
-    @NotNull
-    public final synchronized BukkitTask runTask() {
-        return super.runTask(plugin);
-    }
-
-    @Override
-    @NotNull
-    public final synchronized BukkitTask runTaskAsynchronously() {
-        return super.runTaskAsynchronously(plugin);
-    }
-
-    @Override
-    @NotNull
-    public final synchronized BukkitTask runTaskLater(final long delay) {
-        return super.runTaskLater(plugin, delay);
-    }
-
-    @Override
-    @NotNull
-    public final synchronized BukkitTask runTaskLaterAsynchronously(final long delay) {
-        return super.runTaskLaterAsynchronously(plugin, delay);
-    }
-
-    @Override
-    @NotNull
-    public final synchronized BukkitTask runTaskTimer(final long delay, final long period) {
-        return super.runTaskTimer(plugin, delay, period);
-    }
-
-    @Override
-    @NotNull
-    public final synchronized BukkitTask runTaskTimerAsynchronously(final long delay, final long period) {
-        return super.runTaskTimerAsynchronously(plugin, delay, period);
-    }
-}

eco-core/core-backend/src/main/java/com/willfp/eco/internal/scheduling/EcoScheduler.java

@@ -1,58 +0,0 @@
-package com.willfp.eco.internal.scheduling;
-
-import com.willfp.eco.core.EcoPlugin;
-import com.willfp.eco.core.PluginDependent;
-import com.willfp.eco.core.scheduling.Scheduler;
-import org.bukkit.Bukkit;
-import org.bukkit.scheduler.BukkitTask;
-import org.jetbrains.annotations.ApiStatus;
-import org.jetbrains.annotations.NotNull;
-
-public class EcoScheduler extends PluginDependent<EcoPlugin> implements Scheduler {
-    @ApiStatus.Internal
-    public EcoScheduler(@NotNull final EcoPlugin plugin) {
-        super(plugin);
-    }
-
-    @Override
-    public BukkitTask runLater(@NotNull final Runnable runnable,
-                               final long ticksLater) {
-        return Bukkit.getScheduler().runTaskLater(this.getPlugin(), runnable, ticksLater);
-    }
-
-    @Override
-    public BukkitTask runTimer(@NotNull final Runnable runnable,
-                               final long delay,
-                               final long repeat) {
-        return Bukkit.getScheduler().runTaskTimer(this.getPlugin(), runnable, delay, repeat);
-    }
-
-    @Override
-    public BukkitTask runAsyncTimer(@NotNull final Runnable runnable,
-                                    final long delay,
-                                    final long repeat) {
-        return Bukkit.getScheduler().runTaskTimerAsynchronously(this.getPlugin(), runnable, delay, repeat);
-    }
-
-    @Override
-    public BukkitTask run(@NotNull final Runnable runnable) {
-        return Bukkit.getScheduler().runTask(this.getPlugin(), runnable);
-    }
-
-    @Override
-    public BukkitTask runAsync(@NotNull final Runnable runnable) {
-        return Bukkit.getScheduler().runTaskAsynchronously(this.getPlugin(), runnable);
-    }
-
-    @Override
-    public int syncRepeating(@NotNull final Runnable runnable,
-                             final long delay,
-                             final long repeat) {
-        return Bukkit.getScheduler().scheduleSyncRepeatingTask(this.getPlugin(), runnable, delay, repeat);
-    }
-
-    @Override
-    public void cancelAll() {
-        Bukkit.getScheduler().cancelTasks(this.getPlugin());
-    }
-}

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/EcoCleaner.kt

@@ -0,0 +1,32 @@
+package com.willfp.eco.internal
+
+import com.willfp.eco.core.EcoPlugin
+import com.willfp.eco.core.items.Items
+import com.willfp.eco.core.proxy.Cleaner
+import com.willfp.eco.internal.proxy.EcoProxyFactory
+import java.net.URLClassLoader
+
+class EcoCleaner: Cleaner {
+    override fun clean(plugin: EcoPlugin) {
+        if (plugin.proxyPackage.isNotEmpty()) {
+            val factory = plugin.proxyFactory as EcoProxyFactory
+            factory.clean()
+        }
+
+        Plugins.LOADED_ECO_PLUGINS.remove(plugin.name.lowercase())
+
+        for (customItem in Items.getCustomItems()) {
+            if (customItem.key.namespace.equals(plugin.name.lowercase(), ignoreCase = true)) {
+                Items.removeCustomItem(customItem.key)
+            }
+        }
+
+        val classLoader = plugin::class.java.classLoader
+
+        if (classLoader is URLClassLoader) {
+            classLoader.close()
+        }
+
+        System.gc()
+    }
+}

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/Plugins.kt

@@ -0,0 +1,7 @@
+package com.willfp.eco.internal
+
+import com.willfp.eco.core.EcoPlugin
+
+object Plugins {
+    val LOADED_ECO_PLUGINS = HashMap<String, EcoPlugin>()
+}

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/config/EcoConfigFactory.kt

@@ -0,0 +1,68 @@
+package com.willfp.eco.internal.config
+
+import com.willfp.eco.core.EcoPlugin
+import com.willfp.eco.core.config.interfaces.Config
+import com.willfp.eco.core.config.interfaces.JSONConfig
+import com.willfp.eco.core.config.wrapper.ConfigFactory
+import com.willfp.eco.internal.config.json.EcoJSONConfigSection
+import com.willfp.eco.internal.config.json.EcoLoadableJSONConfig
+import com.willfp.eco.internal.config.yaml.EcoLoadableYamlConfig
+import com.willfp.eco.internal.config.yaml.EcoUpdatableYamlConfig
+import com.willfp.eco.internal.config.yaml.EcoYamlConfigSection
+import org.bukkit.configuration.file.YamlConfiguration
+
+class EcoConfigFactory : ConfigFactory {
+    override fun createUpdatableYamlConfig(
+        configName: String,
+        plugin: EcoPlugin,
+        subDirectoryPath: String,
+        source: Class<*>,
+        removeUnused: Boolean,
+        vararg updateBlacklist: String
+    ): Config {
+        return EcoUpdatableYamlConfig(
+            configName,
+            plugin,
+            subDirectoryPath,
+            source,
+            removeUnused,
+            *updateBlacklist
+        )
+    }
+
+    override fun createLoadableJSONConfig(
+        configName: String,
+        plugin: EcoPlugin,
+        subDirectoryPath: String,
+        source: Class<*>
+    ): JSONConfig {
+        return EcoLoadableJSONConfig(
+            configName,
+            plugin,
+            subDirectoryPath,
+            source
+        )
+    }
+
+    override fun createLoadableYamlConfig(
+        configName: String,
+        plugin: EcoPlugin,
+        subDirectoryPath: String,
+        source: Class<*>
+    ): Config {
+        return EcoLoadableYamlConfig(
+            configName,
+            plugin,
+            subDirectoryPath,
+            source
+        )
+    }
+
+    override fun createYamlConfig(config: YamlConfiguration): Config {
+        return EcoYamlConfigSection(config)
+    }
+
+    override fun createJSONConfig(values: Map<String, Any>): JSONConfig {
+        return EcoJSONConfigSection(values)
+    }
+}

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/config/json/EcoJSONConfigSection.kt

@@ -0,0 +1,7 @@
+package com.willfp.eco.internal.config.json
+
+class EcoJSONConfigSection(values: Map<String, Any?>) : EcoJSONConfigWrapper() {
+    init {
+        init(values)
+    }
+}

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/config/json/EcoJSONConfigWrapper.kt

@@ -0,0 +1,299 @@
+package com.willfp.eco.internal.config.json
+
+import com.google.gson.Gson
+import com.google.gson.GsonBuilder
+import com.willfp.eco.core.config.interfaces.JSONConfig
+import com.willfp.eco.util.StringUtils
+import org.apache.commons.lang.Validate
+import java.util.*
+
+@Suppress("UNCHECKED_CAST")
+open class EcoJSONConfigWrapper : JSONConfig {
+    val handle: Gson = GsonBuilder().setPrettyPrinting().create()
+
+    val values: MutableMap<String, Any?> = HashMap()
+
+    private val cache: MutableMap<String, Any> = HashMap()
+
+    fun init(values: Map<String, Any?>) {
+        this.values.clear()
+        this.values.putAll(values)
+    }
+
+    override fun clearCache() {
+        cache.clear()
+    }
+
+    override fun toPlaintext(): String {
+        return this.handle.toJson(this.values)
+    }
+
+    override fun has(path: String): Boolean {
+        return getOfKnownType(path, Any::class.java) != null
+    }
+
+    private fun <T: Any?> getOfKnownType(
+        path: String,
+        clazz: Class<T>
+    ): T? {
+        return getOfKnownType(path, clazz, true)
+    }
+
+    protected fun <T> getOfKnownType(
+        path: String,
+        clazz: Class<T>,
+        isBase: Boolean
+    ): T? {
+        var closestPath = path
+        if (cache.containsKey(path) && isBase) {
+            return cache[path] as T?
+        }
+        if (path.contains(".")) {
+            val split = path.split("\\.".toRegex()).toTypedArray()
+            closestPath = split[0]
+        }
+        return if (values[closestPath] is Map<*, *> && path != closestPath) {
+            val section =
+                EcoJSONConfigSection((values[closestPath] as Map<String, Any?>?)!!)
+            section.getOfKnownType(path.substring(closestPath.length + 1), clazz, false)
+        } else {
+            if (values.containsKey(closestPath)) {
+                values[closestPath] as T?
+            } else {
+                null
+            }
+        }
+    }
+
+    override fun getKeys(deep: Boolean): List<String> {
+        return if (deep) {
+            ArrayList(getDeepKeys(HashSet(), ""))
+        } else {
+            ArrayList(values.keys)
+        }
+    }
+
+    protected fun getDeepKeys(
+        list: MutableSet<String>,
+        root: String
+    ): Set<String> {
+        for (key in values.keys) {
+            list.add(root + key)
+            if (values[key] is Map<*, *>) {
+                val section = EcoJSONConfigSection((values[key] as Map<String, Any?>?)!!)
+                list.addAll(section.getDeepKeys(list, "$root$key."))
+            }
+        }
+        return list
+    }
+
+    override fun get(path: String): Any? {
+        return getOfKnownType(path, Any::class.java)
+    }
+
+    override fun set(
+        path: String,
+        `object`: Any?
+    ) {
+        setRecursively(path, `object`)
+        clearCache()
+    }
+
+    protected fun setRecursively(
+        path: String,
+        obj: Any?
+    ) {
+        var closestPath = path
+        if (path.contains(".")) {
+            val split = path.split("\\.".toRegex()).toTypedArray()
+            closestPath = split[0]
+        }
+        if (values[closestPath] is Map<*, *> && path != closestPath) {
+            val section = EcoJSONConfigSection((values[closestPath] as Map<String, Any?>?)!!)
+            section.setRecursively(path.substring(closestPath.length + 1), obj)
+            values[closestPath] = section.values
+        } else {
+            var ob = obj
+            if (ob is JSONConfig) {
+                ob = (obj as EcoJSONConfigWrapper).values
+            }
+            values[path] = ob
+        }
+    }
+
+    override fun getSubsection(path: String): JSONConfig {
+        val subsection = getSubsectionOrNull(path)
+        Validate.notNull(subsection)
+        return subsection!!
+    }
+
+    override fun getSubsectionOrNull(path: String): JSONConfig? {
+        return if (values.containsKey(path)) {
+            val subsection = values[path] as Map<String, Any>?
+            EcoJSONConfigSection(subsection!!)
+        } else {
+            null
+        }
+    }
+
+    override fun getSubsections(path: String): List<JSONConfig> {
+        val subsections = getSubsectionsOrNull(path)
+        return subsections ?: ArrayList()
+    }
+
+    override fun getSubsectionsOrNull(path: String): List<JSONConfig>? {
+        val maps = getOfKnownType(path, Any::class.java) as List<Map<String, Any>>?
+            ?: return null
+        val configs: MutableList<JSONConfig> = ArrayList()
+        for (map in maps) {
+            configs.add(EcoJSONConfigSection(map))
+        }
+        return configs
+    }
+
+    override fun getInt(path: String): Int {
+        return (getOfKnownType(path, Double::class.java) ?: 0.0).toInt()
+    }
+
+    override fun getIntOrNull(path: String): Int? {
+        return if (has(path)) {
+            getInt(path)
+        } else {
+            null
+        }
+    }
+
+    override fun getInt(
+        path: String,
+        def: Int
+    ): Int {
+        return Objects.requireNonNullElse(getOfKnownType(path, Int::class.java), def)
+    }
+
+    override fun getInts(path: String): List<Int> {
+        return Objects.requireNonNullElse(getOfKnownType(path, Any::class.java), ArrayList<Any>()) as List<Int>
+    }
+
+    override fun getIntsOrNull(path: String): List<Int>? {
+        return if (has(path)) {
+            getInts(path)
+        } else {
+            null
+        }
+    }
+
+    override fun getBool(path: String): Boolean {
+        return Objects.requireNonNullElse(getOfKnownType(path, Boolean::class.java), false)
+    }
+
+    override fun getBoolOrNull(path: String): Boolean? {
+        return if (has(path)) {
+            getBool(path)
+        } else {
+            null
+        }
+    }
+
+    override fun getBools(path: String): List<Boolean> {
+        return Objects.requireNonNullElse(getOfKnownType(path, Any::class.java), ArrayList<Any>()) as List<Boolean>
+    }
+
+    override fun getBoolsOrNull(path: String): List<Boolean>? {
+        return if (has(path)) {
+            getBools(path)
+        } else {
+            null
+        }
+    }
+
+    override fun getString(path: String): String {
+        return getString(path, true)
+    }
+
+    override fun getString(
+        path: String,
+        format: Boolean
+    ): String {
+        val string = getOfKnownType(path, String::class.java) ?: ""
+        return if (format) StringUtils.format(string) else string
+    }
+
+    override fun getStringOrNull(path: String): String? {
+        return if (has(path)) {
+            getString(path)
+        } else {
+            null
+        }
+    }
+
+    override fun getStringOrNull(
+        path: String,
+        format: Boolean
+    ): String? {
+        return if (has(path)) {
+            getString(path, format)
+        } else {
+            null
+        }
+    }
+
+    override fun getStrings(path: String): List<String> {
+        return getStrings(path, true)
+    }
+
+    override fun getStrings(
+        path: String,
+        format: Boolean
+    ): List<String> {
+        val strings =
+            Objects.requireNonNullElse(getOfKnownType(path, Any::class.java), ArrayList<Any>()) as List<String>
+        return if (format) StringUtils.formatList(strings) else strings
+    }
+
+    override fun getStringsOrNull(path: String): List<String>? {
+        return if (has(path)) {
+            getStrings(path)
+        } else {
+            null
+        }
+    }
+
+    override fun getStringsOrNull(
+        path: String,
+        format: Boolean
+    ): List<String>? {
+        return if (has(path)) {
+            getStrings(path, format)
+        } else {
+            null
+        }
+    }
+
+    override fun getDouble(path: String): Double {
+        return Objects.requireNonNullElse(getOfKnownType(path, Double::class.java), 0.0)
+    }
+
+    override fun getDoubleOrNull(path: String): Double? {
+        return if (has(path)) {
+            getDouble(path)
+        } else {
+            null
+        }
+    }
+
+    override fun getDoubles(path: String): List<Double> {
+        return Objects.requireNonNullElse(getOfKnownType(path, Any::class.java), ArrayList<Any>()) as List<Double>
+    }
+
+    override fun getDoublesOrNull(path: String): List<Double>? {
+        return if (has(path)) {
+            getDoubles(path)
+        } else {
+            null
+        }
+    }
+
+    override fun clone(): JSONConfig {
+        return EcoJSONConfigSection(HashMap<String, Any>(this.values))
+    }
+}

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/config/json/EcoLoadableJSONConfig.kt

@@ -0,0 +1,100 @@
+package com.willfp.eco.internal.config.json
+
+import com.willfp.eco.core.EcoPlugin
+import com.willfp.eco.core.config.interfaces.LoadableConfig
+import org.jetbrains.annotations.NotNull
+import java.io.*
+import java.nio.file.Files
+import java.nio.file.StandardOpenOption
+
+@Suppress("UNCHECKED_CAST")
+class EcoLoadableJSONConfig(
+    configName: String,
+    private val plugin: EcoPlugin,
+    private val subDirectoryPath: String,
+    private val source: Class<*>
+) : EcoJSONConfigWrapper(), LoadableConfig {
+
+    private val configFile: File
+    private val name: String = "$configName.json"
+
+    fun reloadFromFile() {
+        try {
+            init(configFile)
+        } catch (e: IOException) {
+            e.printStackTrace()
+        }
+    }
+
+    override fun createFile() {
+        val resourcePath = resourcePath
+        val inputStream = source.getResourceAsStream(resourcePath)!!
+        val outFile = File(this.plugin.dataFolder, resourcePath)
+        val lastIndex = resourcePath.lastIndexOf('/')
+        val outDir = File(this.plugin.dataFolder, resourcePath.substring(0, lastIndex.coerceAtLeast(0)))
+        if (!outDir.exists()) {
+            outDir.mkdirs()
+        }
+        if (!outFile.exists()) {
+            val out: OutputStream = FileOutputStream(outFile)
+            val buf = ByteArray(1024)
+            var len: Int
+            while (inputStream.read(buf).also { len = it } > 0) {
+                out.write(buf, 0, len)
+            }
+            out.close()
+            inputStream.close()
+        }
+    }
+
+    override fun getResourcePath(): String {
+        val resourcePath: String = if (subDirectoryPath.isEmpty()) {
+            name
+        } else {
+            subDirectoryPath + name
+        }
+        return "/$resourcePath"
+    }
+
+    @Throws(IOException::class)
+    override fun save() {
+        if (configFile.delete()) {
+            Files.write(
+                configFile.toPath(),
+                toPlaintext().toByteArray(),
+                StandardOpenOption.CREATE,
+                StandardOpenOption.WRITE
+            )
+        }
+    }
+
+    @Throws(FileNotFoundException::class)
+    fun init(file: File) {
+        super.init(handle.fromJson(FileReader(file), Map::class.java) as @NotNull MutableMap<String, Any>)
+    }
+
+    override fun getName(): String {
+        return name
+    }
+
+    override fun getConfigFile(): File {
+        return configFile
+    }
+
+    init {
+        val directory: File = File(this.plugin.dataFolder, subDirectoryPath)
+        if (!directory.exists()) {
+            directory.mkdirs()
+        }
+        if (!File(directory, name).exists()) {
+            createFile()
+        }
+        configFile = File(directory, name)
+        try {
+            init(configFile)
+        } catch (e: IOException) {
+            e.printStackTrace()
+        }
+        plugin.configHandler.addConfig(this)
+    }
+}

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/config/updating/EcoConfigHandler.kt

@@ -0,0 +1,64 @@
+package com.willfp.eco.internal.config.updating
+
+import com.willfp.eco.core.EcoPlugin
+import com.willfp.eco.core.PluginDependent
+import com.willfp.eco.core.config.interfaces.LoadableConfig
+import com.willfp.eco.core.config.updating.ConfigHandler
+import com.willfp.eco.core.config.updating.ConfigUpdater
+import com.willfp.eco.internal.config.json.EcoLoadableJSONConfig
+import com.willfp.eco.internal.config.updating.exceptions.InvalidUpdateMethodException
+import com.willfp.eco.internal.config.yaml.EcoLoadableYamlConfig
+import com.willfp.eco.internal.config.yaml.EcoUpdatableYamlConfig
+import org.reflections.Reflections
+import org.reflections.scanners.MethodAnnotationsScanner
+import java.lang.reflect.Modifier
+
+class EcoConfigHandler(
+    plugin: EcoPlugin
+) : PluginDependent<EcoPlugin>(plugin), ConfigHandler {
+    private val reflections: Reflections = Reflections(
+        this.plugin::class.java.classLoader,
+        MethodAnnotationsScanner()
+    )
+
+    private val configs: MutableList<LoadableConfig> = ArrayList()
+
+    override fun callUpdate() {
+        for (method in reflections.getMethodsAnnotatedWith(ConfigUpdater::class.java)) {
+            if (!Modifier.isStatic(method.modifiers)) {
+                throw InvalidUpdateMethodException("Update method in ${method.declaringClass.name} must be static.")
+            }
+
+            try {
+                when (method.parameterCount) {
+                    0 -> method.invoke(null)
+                    1 -> method.invoke(null, this.plugin)
+                    else -> throw InvalidUpdateMethodException("Update method must have 0 parameters or a plugin parameter.")
+                }
+            } catch (e: ReflectiveOperationException) {
+                e.printStackTrace()
+                throw InvalidUpdateMethodException("Update method generated an exception")
+            }
+        }
+    }
+
+    override fun saveAllConfigs() {
+        for (config in configs) {
+            config.save()
+        }
+    }
+
+    override fun addConfig(config: LoadableConfig) {
+        configs.add(config)
+    }
+
+    override fun updateConfigs() {
+        for (config in configs) {
+            when (config) {
+                is EcoUpdatableYamlConfig -> config.update()
+                is EcoLoadableYamlConfig -> config.reloadFromFile()
+                is EcoLoadableJSONConfig -> config.reloadFromFile()
+            }
+        }
+    }
+}

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/config/updating/exceptions/InvalidUpdateMethodException.kt

@@ -0,0 +1,3 @@
+package com.willfp.eco.internal.config.updating.exceptions
+
+class InvalidUpdateMethodException(message: String) : RuntimeException(message)

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/config/yaml/EcoLoadableYamlConfig.kt

@@ -0,0 +1,93 @@
+package com.willfp.eco.internal.config.yaml
+
+import com.willfp.eco.core.EcoPlugin
+import com.willfp.eco.core.config.interfaces.LoadableConfig
+import com.willfp.eco.core.config.interfaces.WrappedYamlConfiguration
+import org.bukkit.configuration.InvalidConfigurationException
+import org.bukkit.configuration.file.YamlConfiguration
+import java.io.File
+import java.io.FileOutputStream
+import java.io.IOException
+import java.io.OutputStream
+
+open class EcoLoadableYamlConfig(
+    configName: String,
+    private val plugin: EcoPlugin,
+    private val subDirectoryPath: String,
+    val source: Class<*>
+) : EcoYamlConfigWrapper<YamlConfiguration>(), WrappedYamlConfiguration, LoadableConfig {
+
+    private val configFile: File
+    private val name: String = "$configName.yml"
+
+    fun reloadFromFile() {
+        try {
+            handle.load(getConfigFile())
+        } catch (e: IOException) {
+            e.printStackTrace()
+        } catch (e: InvalidConfigurationException) {
+            e.printStackTrace()
+        }
+    }
+
+    final override fun createFile() {
+        val resourcePath = resourcePath
+        val inputStream = source.getResourceAsStream(resourcePath)!!
+        val outFile = File(this.plugin.dataFolder, resourcePath)
+        val lastIndex = resourcePath.lastIndexOf('/')
+        val outDir = File(this.plugin.dataFolder, resourcePath.substring(0, lastIndex.coerceAtLeast(0)))
+        if (!outDir.exists()) {
+            outDir.mkdirs()
+        }
+        if (!outFile.exists()) {
+            val out: OutputStream = FileOutputStream(outFile)
+            val buf = ByteArray(1024)
+            var len: Int
+            while (inputStream.read(buf).also { len = it } > 0) {
+                out.write(buf, 0, len)
+            }
+            out.close()
+            inputStream.close()
+        }
+        plugin.configHandler.addConfig(this)
+    }
+
+    override fun getResourcePath(): String {
+        val resourcePath: String = if (subDirectoryPath.isEmpty()) {
+            name
+        } else {
+            subDirectoryPath + name
+        }
+        return "/$resourcePath"
+    }
+
+    @Throws(IOException::class)
+    override fun save() {
+        handle.save(getConfigFile())
+    }
+
+    override fun getBukkitHandle(): YamlConfiguration {
+        return handle
+    }
+
+    override fun getName(): String {
+        return name
+    }
+
+    override fun getConfigFile(): File {
+        return configFile
+    }
+
+    init {
+        val directory = File(this.plugin.dataFolder, subDirectoryPath)
+        if (!directory.exists()) {
+            directory.mkdirs()
+        }
+        if (!File(directory, name).exists()) {
+            createFile()
+        }
+        configFile = File(directory, name)
+        this.plugin.configHandler.addConfig(this)
+        init(YamlConfiguration.loadConfiguration(configFile))
+    }
+}

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/config/yaml/EcoUpdatableYamlConfig.kt

@@ -0,0 +1,74 @@
+package com.willfp.eco.internal.config.yaml
+
+import com.willfp.eco.core.EcoPlugin
+import org.bukkit.configuration.InvalidConfigurationException
+import org.bukkit.configuration.file.YamlConfiguration
+import java.io.BufferedReader
+import java.io.IOException
+import java.io.InputStreamReader
+import java.nio.charset.StandardCharsets
+
+class EcoUpdatableYamlConfig(
+    configName: String,
+    plugin: EcoPlugin,
+    subDirectoryPath: String,
+    source: Class<*>,
+    private val removeUnused: Boolean,
+    vararg updateBlacklist: String
+) : EcoLoadableYamlConfig(configName, plugin, subDirectoryPath, source) {
+
+    private val updateBlacklist: MutableList<String> = mutableListOf(*updateBlacklist)
+
+    fun update() {
+        super.clearCache()
+        try {
+            this.handle.load(configFile)
+            val newConfig = configInJar
+            if (newConfig.getKeys(true) == this.handle.getKeys(true)) {
+                return
+            }
+            newConfig.getKeys(true).forEach { key: String ->
+                if (!this.handle.getKeys(true).contains(key)) {
+                    if (updateBlacklist.stream().noneMatch { s: String -> key.contains(s) }) {
+                        this.handle.set(key, newConfig[key])
+                    }
+                }
+            }
+            if (removeUnused) {
+                this.handle.getKeys(true).forEach { s ->
+                    if (!newConfig.getKeys(true).contains(s)) {
+                        if (updateBlacklist.stream().noneMatch(s::contains)) {
+                            this.handle.set(s, null)
+                        }
+                    }
+                }
+            }
+            this.handle.save(configFile)
+        } catch (e: IOException) {
+            e.printStackTrace()
+        } catch (e: InvalidConfigurationException) {
+            e.printStackTrace()
+        }
+    }
+
+    private val configInJar: YamlConfiguration
+        get() {
+            val newIn = source.getResourceAsStream(resourcePath) ?: throw NullPointerException("$name is null?")
+            val reader = BufferedReader(InputStreamReader(newIn, StandardCharsets.UTF_8))
+            val newConfig = YamlConfiguration()
+            try {
+                newConfig.load(reader)
+            } catch (e: IOException) {
+                e.printStackTrace()
+            } catch (e: InvalidConfigurationException) {
+                e.printStackTrace()
+            }
+            return newConfig
+        }
+
+    init {
+        this.updateBlacklist.removeIf { obj: String -> obj.isEmpty() }
+        plugin.configHandler.addConfig(this)
+        update()
+    }
+}

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/config/yaml/EcoYamlConfigSection.kt

@@ -0,0 +1,9 @@
+package com.willfp.eco.internal.config.yaml
+
+import org.bukkit.configuration.ConfigurationSection
+
+class EcoYamlConfigSection(section: ConfigurationSection) : EcoYamlConfigWrapper<ConfigurationSection>() {
+    init {
+        init(section)
+    }
+}

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/config/yaml/EcoYamlConfigWrapper.kt

@@ -0,0 +1,287 @@
+package com.willfp.eco.internal.config.yaml
+
+import com.willfp.eco.core.config.interfaces.Config
+import com.willfp.eco.util.StringUtils
+import org.apache.commons.lang.Validate
+import org.bukkit.configuration.ConfigurationSection
+import org.bukkit.configuration.file.YamlConfiguration
+import java.io.StringReader
+
+@Suppress("UNCHECKED_CAST")
+open class EcoYamlConfigWrapper<T : ConfigurationSection> : Config {
+    lateinit var handle: T
+    private val cache: MutableMap<String, Any?> = HashMap()
+
+    protected fun init(config: T): Config {
+        handle = config
+        return this
+    }
+
+    override fun toPlaintext(): String {
+        val temp = YamlConfiguration()
+        for (key in handle.getKeys(true)) {
+            temp[key] = handle[key]
+        }
+        return temp.saveToString()
+    }
+
+    override fun clearCache() {
+        cache.clear()
+    }
+
+    override fun has(path: String): Boolean {
+        return handle.contains(path)
+    }
+
+    override fun getKeys(deep: Boolean): List<String> {
+        return ArrayList(handle.getKeys(deep))
+    }
+
+    override fun get(path: String): Any? {
+        return handle[path]
+    }
+
+    override fun set(
+        path: String,
+        obj: Any?
+    ) {
+        cache.remove(path)
+        handle[path] = obj
+    }
+
+    override fun getSubsection(path: String): Config {
+        val subsection = getSubsectionOrNull(path)
+        Validate.notNull(subsection)
+        return subsection!!
+    }
+
+    override fun getSubsectionOrNull(path: String): Config? {
+        return if (cache.containsKey(path)) {
+            cache[path] as Config?
+        } else {
+            val raw = handle.getConfigurationSection(path)
+            if (raw == null) {
+                cache[path] = null
+            } else {
+                cache[path] = EcoYamlConfigSection(raw)
+            }
+            getSubsectionOrNull(path)
+        }
+    }
+
+    override fun getInt(path: String): Int {
+        return if (cache.containsKey(path)) {
+            cache[path] as Int
+        } else {
+            cache[path] = handle.getInt(path, 0)
+            getInt(path)
+        }
+    }
+
+    override fun getIntOrNull(path: String): Int? {
+        return if (has(path)) {
+            getInt(path)
+        } else {
+            null
+        }
+    }
+
+    override fun getInt(
+        path: String,
+        def: Int
+    ): Int {
+        return if (cache.containsKey(path)) {
+            cache[path] as Int
+        } else {
+            cache[path] = handle.getInt(path, def)
+            getInt(path)
+        }
+    }
+
+    override fun getInts(path: String): List<Int> {
+        return if (cache.containsKey(path)) {
+            cache[path] as List<Int>
+        } else {
+            cache[path] = if (has(path)) ArrayList(handle.getIntegerList(path)) else ArrayList<Any>()
+            getInts(path)
+        }
+    }
+
+    override fun getIntsOrNull(path: String): List<Int>? {
+        return if (has(path)) {
+            getInts(path)
+        } else {
+            null
+        }
+    }
+
+    override fun getBool(path: String): Boolean {
+        return if (cache.containsKey(path)) {
+            cache[path] as Boolean
+        } else {
+            cache[path] = handle.getBoolean(path)
+            getBool(path)
+        }
+    }
+
+    override fun getBoolOrNull(path: String): Boolean? {
+        return if (has(path)) {
+            getBool(path)
+        } else {
+            null
+        }
+    }
+
+    override fun getBools(path: String): List<Boolean> {
+        return if (cache.containsKey(path)) {
+            cache[path] as List<Boolean>
+        } else {
+            cache[path] =
+                if (has(path)) ArrayList(handle.getBooleanList(path)) else ArrayList<Any>()
+            getBools(path)
+        }
+    }
+
+    override fun getBoolsOrNull(path: String): List<Boolean>? {
+        return if (has(path)) {
+            getBools(path)
+        } else {
+            null
+        }
+    }
+
+    override fun getString(path: String): String {
+        return getString(path, true)
+    }
+
+    override fun getString(
+        path: String,
+        format: Boolean
+    ): String {
+        if (format) {
+            return if (cache.containsKey("$path\$FMT")) {
+                cache["$path\$FMT"] as String
+            } else {
+                val string: String = handle.getString(path, "")!!
+                cache["$path\$FMT"] = StringUtils.format(string)
+                getString(path, format)
+            }
+        } else {
+            return if (cache.containsKey(path)) {
+                cache[path] as String
+            } else {
+                cache[path] = handle.getString(path, "")!!
+                getString(path)
+            }
+        }
+    }
+
+    override fun getStringOrNull(path: String): String? {
+        return if (has(path)) {
+            getString(path)
+        } else {
+            null
+        }
+    }
+
+    override fun getStringOrNull(
+        path: String,
+        format: Boolean
+    ): String? {
+        return if (has(path)) {
+            getString(path, format)
+        } else {
+            null
+        }
+    }
+
+    override fun getStrings(path: String): List<String> {
+        return getStrings(path, true)
+    }
+
+    override fun getStrings(
+        path: String,
+        format: Boolean
+    ): List<String> {
+        if (format) {
+            return if (cache.containsKey("$path\$FMT")) {
+                cache["$path\$FMT"] as List<String>
+            } else {
+                val list = if (has(path)) handle.getStringList(path) else ArrayList()
+                cache["$path\$FMT"] = StringUtils.formatList(list);
+                getStrings(path, true)
+            }
+        } else {
+            return if (cache.containsKey(path)) {
+                cache[path] as List<String>
+            } else {
+                cache[path] =
+                    if (has(path)) ArrayList(handle.getStringList(path)) else ArrayList<Any>()
+                getStrings(path, false)
+            }
+        }
+    }
+
+    override fun getStringsOrNull(path: String): List<String>? {
+        return if (has(path)) {
+            getStrings(path)
+        } else {
+            null
+        }
+    }
+
+    override fun getStringsOrNull(
+        path: String,
+        format: Boolean
+    ): List<String>? {
+        return if (has(path)) {
+            getStrings(path, format)
+        } else {
+            null
+        }
+    }
+
+    override fun getDouble(path: String): Double {
+        return if (cache.containsKey(path)) {
+            cache[path] as Double
+        } else {
+            cache[path] = handle.getDouble(path)
+            getDouble(path)
+        }
+    }
+
+    override fun getDoubleOrNull(path: String): Double? {
+        return if (has(path)) {
+            getDouble(path)
+        } else {
+            null
+        }
+    }
+
+    override fun getDoubles(path: String): List<Double> {
+        return if (cache.containsKey(path)) {
+            cache[path] as List<Double>
+        } else {
+            cache[path] = if (has(path)) ArrayList(handle.getDoubleList(path)) else ArrayList<Any>()
+            getDoubles(path)
+        }
+    }
+
+    override fun getDoublesOrNull(path: String): List<Double>? {
+        return if (has(path)) {
+            getDoubles(path)
+        } else {
+            null
+        }
+    }
+
+    override fun clone(): Config {
+        return EcoYamlConfigSection(
+            YamlConfiguration.loadConfiguration(
+                StringReader(
+                    toPlaintext()
+                )
+            )
+        )
+    }
+}

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/drops/DropManager.kt

@@ -0,0 +1,11 @@
+package com.willfp.eco.internal.drops
+
+import com.willfp.eco.core.EcoPlugin
+
+object DropManager {
+    var type = DropQueueType.COLLATED
+
+    fun update(plugin: EcoPlugin) {
+        type = if (plugin.configYml.getBool("use-fast-collated-drops")) DropQueueType.COLLATED else DropQueueType.STANDARD
+    }
+}

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/drops/DropQueueType.kt

@@ -0,0 +1,5 @@
+package com.willfp.eco.internal.drops
+
+enum class DropQueueType {
+    STANDARD, COLLATED
+}

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/drops/EcoDropQueueFactory.kt

@@ -0,0 +1,15 @@
+package com.willfp.eco.internal.drops
+
+import com.willfp.eco.core.drops.DropQueueFactory
+import com.willfp.eco.core.drops.InternalDropQueue
+import com.willfp.eco.internal.drops.impl.EcoDropQueue
+import com.willfp.eco.internal.drops.impl.EcoFastCollatedDropQueue
+import org.bukkit.entity.Player
+
+class EcoDropQueueFactory : DropQueueFactory {
+    override fun create(player: Player): InternalDropQueue {
+        return if (DropManager.type == DropQueueType.COLLATED) EcoFastCollatedDropQueue(player) else EcoDropQueue(
+            player
+        )
+    }
+}

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/drops/impl/EcoDropQueue.kt

@@ -0,0 +1,87 @@
+package com.willfp.eco.internal.drops.impl
+
+import com.willfp.eco.core.drops.InternalDropQueue
+import com.willfp.eco.util.TelekinesisUtils
+import org.bukkit.Bukkit
+import org.bukkit.Location
+import org.bukkit.Material
+import org.bukkit.entity.EntityType
+import org.bukkit.entity.ExperienceOrb
+import org.bukkit.entity.Player
+import org.bukkit.event.player.PlayerExpChangeEvent
+import org.bukkit.inventory.ItemStack
+import org.bukkit.util.Vector
+
+open class EcoDropQueue(player: Player) : InternalDropQueue {
+    val items: MutableList<ItemStack>
+    var xp: Int
+    val player: Player
+    var loc: Location
+    var hasTelekinesis = false
+
+    override fun addItem(item: ItemStack): InternalDropQueue {
+        items.add(item)
+        return this
+    }
+
+    override fun addItems(itemStacks: Collection<ItemStack>): InternalDropQueue {
+        items.addAll(itemStacks)
+        return this
+    }
+
+    override fun addXP(amount: Int): InternalDropQueue {
+        xp += amount
+        return this
+    }
+
+    override fun setLocation(location: Location): InternalDropQueue {
+        loc = location
+        return this
+    }
+
+    override fun forceTelekinesis(): InternalDropQueue {
+        hasTelekinesis = true
+        return this
+    }
+
+    override fun push() {
+        if (!hasTelekinesis) {
+            hasTelekinesis = TelekinesisUtils.testPlayer(player)
+        }
+        val world = loc.world!!
+        loc = loc.add(0.5, 0.5, 0.5)
+        items.removeIf { itemStack: ItemStack -> itemStack.type == Material.AIR }
+        if (items.isEmpty()) {
+            return
+        }
+        if (hasTelekinesis) {
+            val leftover = player.inventory.addItem(*items.toTypedArray())
+            for (drop in leftover.values) {
+                world.dropItem(loc, drop!!).velocity = Vector()
+            }
+            if (xp > 0) {
+                val event = PlayerExpChangeEvent(player, xp)
+                Bukkit.getPluginManager().callEvent(event)
+                val orb =
+                    world.spawnEntity(player.location.add(0.0, 0.2, 0.0), EntityType.EXPERIENCE_ORB) as ExperienceOrb
+                orb.velocity = Vector(0, 0, 0)
+                orb.experience = event.amount
+            }
+        } else {
+            for (drop in items) {
+                world.dropItem(loc, drop).velocity = Vector()
+            }
+            if (xp > 0) {
+                val orb = world.spawnEntity(loc, EntityType.EXPERIENCE_ORB) as ExperienceOrb
+                orb.experience = xp
+            }
+        }
+    }
+
+    init {
+        items = ArrayList()
+        xp = 0
+        this.player = player
+        loc = player.location
+    }
+}

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/drops/impl/EcoFastCollatedDropQueue.kt

@@ -0,0 +1,51 @@
+package com.willfp.eco.internal.drops.impl
+
+import org.bukkit.Location
+import org.bukkit.entity.Player
+import org.bukkit.inventory.ItemStack
+import java.util.concurrent.ConcurrentHashMap
+
+class EcoFastCollatedDropQueue(player: Player) : EcoDropQueue(player) {
+    override fun push() {
+        val fetched = COLLATED_MAP[player]
+
+        if (fetched == null) {
+            COLLATED_MAP[player] = CollatedDrops(items, loc, xp, hasTelekinesis)
+        } else {
+            fetched.addDrops(items)
+            fetched.location = loc
+            fetched.addXp(xp)
+            if (this.hasTelekinesis) {
+                fetched.forceTelekinesis()
+            }
+
+            COLLATED_MAP[player] = fetched
+        }
+    }
+
+    class CollatedDrops(
+        val drops: MutableList<ItemStack>,
+        var location: Location,
+        var xp: Int,
+        var telekinetic: Boolean
+    ) {
+
+        fun addDrops(toAdd: List<ItemStack>): CollatedDrops {
+            drops.addAll(toAdd)
+            return this
+        }
+
+        fun addXp(xp: Int): CollatedDrops {
+            this.xp += xp
+            return this
+        }
+
+        fun forceTelekinesis() {
+            telekinetic = true
+        }
+    }
+
+    companion object {
+        val COLLATED_MAP: MutableMap<Player, CollatedDrops> = ConcurrentHashMap()
+    }
+}

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/events/EcoEventManager.kt

@@ -0,0 +1,22 @@
+package com.willfp.eco.internal.events
+
+import com.willfp.eco.core.EcoPlugin
+import com.willfp.eco.core.PluginDependent
+import com.willfp.eco.core.events.EventManager
+import org.bukkit.Bukkit
+import org.bukkit.event.HandlerList
+import org.bukkit.event.Listener
+
+class EcoEventManager constructor(plugin: EcoPlugin) : PluginDependent<EcoPlugin>(plugin), EventManager {
+    override fun registerListener(listener: Listener) {
+        Bukkit.getPluginManager().registerEvents(listener, plugin)
+    }
+
+    override fun unregisterListener(listener: Listener) {
+        HandlerList.unregisterAll(listener)
+    }
+
+    override fun unregisterAllListeners() {
+        HandlerList.unregisterAll(plugin)
+    }
+}

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/extensions/EcoExtensionLoader.kt

@@ -0,0 +1,107 @@
+package com.willfp.eco.internal.extensions
+
+import com.google.common.collect.ImmutableSet
+import com.willfp.eco.core.EcoPlugin
+import com.willfp.eco.core.PluginDependent
+import com.willfp.eco.core.config.yaml.YamlTransientConfig
+import com.willfp.eco.core.extensions.Extension
+import com.willfp.eco.core.extensions.ExtensionLoader
+import com.willfp.eco.core.extensions.ExtensionMetadata
+import com.willfp.eco.core.extensions.MalformedExtensionException
+import org.bukkit.configuration.file.YamlConfiguration
+import java.io.File
+import java.io.InputStreamReader
+import java.net.MalformedURLException
+import java.net.URL
+import java.net.URLClassLoader
+
+class EcoExtensionLoader(
+    plugin: EcoPlugin
+) : PluginDependent<EcoPlugin>(plugin), ExtensionLoader {
+    private val extensions: MutableMap<Extension, URLClassLoader> = HashMap()
+
+    override fun loadExtensions() {
+        val dir = File(this.plugin.dataFolder, "/extensions")
+        if (!dir.exists()) {
+            dir.mkdirs()
+        }
+
+        val extensionJars = dir.listFiles() ?: return
+
+        for (extensionJar in extensionJars) {
+            if (!extensionJar.isFile) {
+                continue
+            }
+
+            try {
+                loadExtension(extensionJar)
+            } catch (e: MalformedExtensionException) {
+                this.plugin.logger.warning(extensionJar.name + " caused an error!")
+            }
+        }
+    }
+
+    @Throws(MalformedExtensionException::class)
+    private fun loadExtension(extensionJar: File) {
+        lateinit var url : URL
+
+        try {
+            url = extensionJar.toURI().toURL()
+        } catch (e: MalformedURLException) {
+            e.printStackTrace()
+        }
+
+        val classLoader = URLClassLoader(arrayOf(url), this.plugin::class.java.classLoader)
+        val ymlIn = classLoader.getResourceAsStream("extension.yml")
+            ?: throw MalformedExtensionException ("No extension.yml found in " + extensionJar.name)
+
+        val extensionYml = YamlTransientConfig(YamlConfiguration.loadConfiguration(InputStreamReader(ymlIn)))
+
+        val mainClass = extensionYml.getStringOrNull("main")
+        var name = extensionYml.getStringOrNull("name")
+        var version = extensionYml.getStringOrNull("version")
+        var author = extensionYml.getStringOrNull("author")
+
+
+        if (mainClass == null) {
+            throw MalformedExtensionException ("Invalid extension.yml found in " + extensionJar.name)
+        }
+
+        if (name == null) {
+            this.plugin.logger.warning(extensionJar.name + " doesn't have a name!")
+            name = "Unnamed Extension " + extensionJar.name
+        }
+
+        if (version == null) {
+            this.plugin.logger.warning(extensionJar.name + " doesn't have a version!")
+            version = "1.0.0"
+        }
+
+        if (author == null) {
+            this.plugin.logger.warning(extensionJar.name + " doesn't have an author!")
+            author = "Unnamed Author"
+        }
+
+        val metadata = ExtensionMetadata(version, name, author)
+
+        val cls: Class<*> = classLoader.loadClass(mainClass)
+        val extension: Extension = cls.getConstructor(EcoPlugin::class.java).newInstance(this.plugin) as Extension
+
+        extension.setMetadata(metadata)
+        extension.enable()
+        extensions[extension] = classLoader
+    }
+
+    override fun getLoadedExtensions(): MutableSet<Extension> {
+        return ImmutableSet.copyOf(extensions.keys)
+    }
+
+    override fun unloadExtensions() {
+        extensions.keys.forEach { e -> e.disable() }
+        for (urlClassLoader in extensions.values) {
+            urlClassLoader.close()
+        }
+
+        extensions.clear()
+    }
+}

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/factory/EcoMetadataValueFactory.kt

@@ -0,0 +1,12 @@
+package com.willfp.eco.internal.factory
+
+import com.willfp.eco.core.EcoPlugin
+import com.willfp.eco.core.PluginDependent
+import com.willfp.eco.core.factory.MetadataValueFactory
+import org.bukkit.metadata.FixedMetadataValue
+
+class EcoMetadataValueFactory(plugin: EcoPlugin) : PluginDependent<EcoPlugin>(plugin), MetadataValueFactory {
+    override fun create(value: Any): FixedMetadataValue {
+        return FixedMetadataValue(plugin, value)
+    }
+}

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/factory/EcoNamespacedKeyFactory.kt

@@ -0,0 +1,12 @@
+package com.willfp.eco.internal.factory
+
+import com.willfp.eco.core.EcoPlugin
+import com.willfp.eco.core.PluginDependent
+import com.willfp.eco.core.factory.NamespacedKeyFactory
+import org.bukkit.NamespacedKey
+
+class EcoNamespacedKeyFactory(plugin: EcoPlugin) : PluginDependent<EcoPlugin>(plugin), NamespacedKeyFactory {
+    override fun create(key: String): NamespacedKey {
+        return NamespacedKey(plugin, key)
+    }
+}

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/factory/EcoRunnableFactory.kt

@@ -0,0 +1,18 @@
+package com.willfp.eco.internal.factory
+
+import com.willfp.eco.core.EcoPlugin
+import com.willfp.eco.core.PluginDependent
+import com.willfp.eco.core.factory.RunnableFactory
+import com.willfp.eco.core.scheduling.RunnableTask
+import com.willfp.eco.internal.scheduling.EcoRunnableTask
+import java.util.function.Consumer
+
+class EcoRunnableFactory(plugin: EcoPlugin) : PluginDependent<EcoPlugin>(plugin), RunnableFactory {
+    override fun create(consumer: Consumer<RunnableTask>): RunnableTask {
+        return object : EcoRunnableTask(plugin) {
+            override fun run() {
+                consumer.accept(this)
+            }
+        }
+    }
+}

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/fast/EcoFastItemStack.kt

@@ -0,0 +1,13 @@
+package com.willfp.eco.internal.fast
+
+import com.willfp.eco.core.fast.FastItemStack
+import org.bukkit.inventory.ItemStack
+
+abstract class EcoFastItemStack<T: Any>(
+    val handle: T,
+    val bukkit: ItemStack
+) : FastItemStack {
+    override fun unwrap(): ItemStack {
+        return bukkit
+    }
+}

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/gui/EcoGUIFactory.kt

@@ -0,0 +1,18 @@
+package com.willfp.eco.internal.gui
+
+import com.willfp.eco.core.gui.GUIFactory
+import com.willfp.eco.core.gui.menu.MenuBuilder
+import com.willfp.eco.core.gui.slot.SlotBuilder
+import com.willfp.eco.core.gui.slot.functional.SlotProvider
+import com.willfp.eco.internal.gui.menu.EcoMenuBuilder
+import com.willfp.eco.internal.gui.slot.EcoSlotBuilder
+
+class EcoGUIFactory : GUIFactory {
+    override fun createSlotBuilder(provider: SlotProvider): SlotBuilder {
+        return EcoSlotBuilder(provider)
+    }
+
+    override fun createMenuBuilder(rows: Int): MenuBuilder {
+        return EcoMenuBuilder(rows)
+    }
+}

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/gui/menu/EcoMenu.kt

@@ -0,0 +1,78 @@
+package com.willfp.eco.internal.gui.menu
+
+import com.willfp.eco.core.gui.menu.CloseHandler
+import com.willfp.eco.core.gui.menu.Menu
+import com.willfp.eco.core.gui.slot.Slot
+import com.willfp.eco.internal.gui.slot.EcoSlot
+import com.willfp.eco.util.StringUtils
+import org.bukkit.Bukkit
+import org.bukkit.entity.Player
+import org.bukkit.event.inventory.InventoryCloseEvent
+import org.bukkit.inventory.Inventory
+import org.bukkit.inventory.ItemStack
+
+class EcoMenu(
+    private val rows: Int,
+    val slots: List<MutableList<EcoSlot>>,
+    private val title: String,
+    private val onClose: CloseHandler
+): Menu {
+    override fun getSlot(row: Int, column: Int): Slot {
+        if (row < 1 || row > this.rows) {
+            throw IllegalArgumentException("Invalid row number!")
+        }
+
+        if (column < 1 || column > 9) {
+            throw IllegalArgumentException("Invalid column number!")
+        }
+
+        return slots[row - 1][column - 1]
+    }
+
+    override fun open(player: Player): Inventory {
+        val inventory = Bukkit.createInventory(null, rows * 9, title)
+
+        var i = 0
+        for (row in slots) {
+            for (item in row) {
+                if (i == rows * 9) {
+                    break
+                }
+                val slotItem = item.getItemStack(player, this)
+                val meta = slotItem.itemMeta
+                if (meta != null) {
+                    val lore = meta.lore
+                    if (lore != null) {
+                        lore.replaceAll{ s -> StringUtils.format(s, player) }
+                        meta.lore = lore
+                    }
+                    slotItem.itemMeta = meta
+                }
+                inventory.setItem(i, slotItem)
+                i++
+            }
+        }
+
+        player.openInventory(inventory)
+        MenuHandler.registerMenu(inventory, this)
+        return inventory
+    }
+
+    fun handleClose(event: InventoryCloseEvent) {
+        onClose.handle(event, this)
+    }
+
+    override fun getRows(): Int {
+        return rows
+    }
+
+    override fun getTitle(): String {
+        return title
+    }
+
+    override fun getCaptiveItems(player: Player): MutableList<ItemStack> {
+        val inventory = MenuHandler.getExtendedInventory(player.openInventory.topInventory)
+        inventory ?: return ArrayList()
+        return inventory.captiveItems
+    }
+}

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/gui/menu/EcoMenuBuilder.kt

@@ -0,0 +1,84 @@
+package com.willfp.eco.internal.gui.menu
+
+import com.willfp.eco.core.gui.menu.CloseHandler
+import com.willfp.eco.core.gui.menu.Menu
+import com.willfp.eco.core.gui.menu.MenuBuilder
+import com.willfp.eco.core.gui.slot.FillerMask
+import com.willfp.eco.core.gui.slot.FillerSlot
+import com.willfp.eco.core.gui.slot.Slot
+import com.willfp.eco.internal.gui.slot.EcoFillerSlot
+import com.willfp.eco.internal.gui.slot.EcoSlot
+import com.willfp.eco.util.ListUtils
+import com.willfp.eco.util.StringUtils
+import org.bukkit.Material
+import org.bukkit.inventory.ItemStack
+import java.util.function.Consumer
+
+class EcoMenuBuilder(private val rows: Int) : MenuBuilder {
+    private var title = "Menu"
+    private var maskSlots: List<MutableList<Slot?>>
+    private val slots: List<MutableList<Slot?>> = ListUtils.create2DList(rows, 9)
+    private var onClose = CloseHandler { _, _ -> }
+
+    override fun setTitle(title: String): MenuBuilder {
+        this.title = StringUtils.format(title)
+        return this
+    }
+
+    override fun setSlot(
+        row: Int,
+        column: Int,
+        slot: Slot
+    ): MenuBuilder {
+        require(!(row < 1 || row > rows)) { "Invalid row number!" }
+        require(!(column < 1 || column > 9)) { "Invalid column number!" }
+        slots[row - 1][column - 1] = slot
+        return this
+    }
+
+    override fun modfiy(modifier: Consumer<MenuBuilder>): MenuBuilder {
+        modifier.accept(this)
+        return this
+    }
+
+    override fun setMask(mask: FillerMask): MenuBuilder {
+        maskSlots = mask.mask
+        return this
+    }
+
+    override fun onClose(action: CloseHandler): MenuBuilder {
+        onClose = action
+        return this
+    }
+
+    override fun build(): Menu {
+        val tempSlots: MutableList<MutableList<Slot?>> = ArrayList(maskSlots)
+
+        for (i in slots.indices) {
+            for (j in slots[i].indices) {
+                val slot = slots[i][j] ?: continue
+                tempSlots[i][j] = slot
+            }
+        }
+
+        val finalSlots: MutableList<MutableList<EcoSlot>> = ArrayList()
+
+        for (row in tempSlots) {
+            val tempRow = ArrayList<EcoSlot>()
+            for (slot in row) {
+                var tempSlot = slot
+                if (tempSlot is FillerSlot) {
+                    tempSlot = EcoFillerSlot(tempSlot.itemStack)
+                }
+                tempRow.add((tempSlot ?: EcoFillerSlot(ItemStack(Material.AIR))) as EcoSlot)
+            }
+            finalSlots.add(tempRow)
+        }
+
+        return EcoMenu(rows, finalSlots, title, onClose)
+    }
+
+    init {
+        maskSlots = ListUtils.create2DList(rows, 9)
+    }
+}

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/gui/menu/ExtendedInventory.kt

@@ -0,0 +1,55 @@
+package com.willfp.eco.internal.gui.menu
+
+import com.willfp.eco.internal.gui.slot.EcoCaptivatorSlot
+import com.willfp.eco.util.MenuUtils
+import com.willfp.eco.util.StringUtils
+import org.bukkit.entity.Player
+import org.bukkit.inventory.Inventory
+import org.bukkit.inventory.ItemStack
+
+class ExtendedInventory(
+    val inventory: Inventory,
+    private val menu: EcoMenu
+) {
+    val captiveItems: MutableList<ItemStack> = ArrayList()
+
+    fun refresh(player: Player) {
+        captiveItems.clear()
+        for (i in 0 until inventory.size) {
+            val pair = MenuUtils.convertSlotToRowColumn(i)
+            val row = pair.first!!
+            val column = pair.second!!
+            val slot = menu.getSlot(row, column)
+            if (slot is EcoCaptivatorSlot) {
+                val defaultItem = slot.getItemStack(player)
+                val item = inventory.getItem(i) ?: continue
+                if (item != defaultItem) {
+                    captiveItems.add(item)
+                }
+            }
+        }
+
+        var i = 0
+        for (row in menu.slots) {
+            for (slot in row) {
+                if (i == menu.rows * 9) {
+                    break
+                }
+                val slotItem = slot.getItemStack(player, menu)
+                val meta = slotItem.itemMeta
+                if (meta != null) {
+                    val lore = meta.lore
+                    if (lore != null) {
+                        lore.replaceAll{ s -> StringUtils.format(s, player) }
+                        meta.lore = lore
+                    }
+                    slotItem.itemMeta = meta
+                }
+                if (!slot.isCaptive) {
+                    inventory.setItem(i, slotItem)
+                }
+                i++
+            }
+        }
+    }
+}

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/gui/menu/MenuHandler.kt

@@ -0,0 +1,31 @@
+package com.willfp.eco.internal.gui.menu
+
+import com.willfp.eco.core.gui.menu.Menu
+import org.bukkit.inventory.Inventory
+
+object MenuHandler {
+    private val MENUS: MutableMap<ExtendedInventory, EcoMenu> = HashMap()
+    private val INVS: MutableMap<Inventory, ExtendedInventory> = HashMap()
+
+    fun registerMenu(
+        inventory: Inventory,
+        menu: EcoMenu
+    ) {
+        val extendedInventory = ExtendedInventory(inventory, menu)
+        INVS[inventory] = extendedInventory
+        MENUS[extendedInventory] = menu
+    }
+
+    fun unregisterMenu(inventory: Inventory) {
+        MENUS.remove(INVS[inventory])
+        INVS.remove(inventory)
+    }
+
+    fun getMenu(inventory: Inventory): Menu? {
+        return MENUS[INVS[inventory]]
+    }
+
+    fun getExtendedInventory(inventory: Inventory): ExtendedInventory? {
+        return INVS[inventory]
+    }
+}

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/gui/slot/EcoCaptivatorSlot.kt

@@ -0,0 +1,28 @@
+package com.willfp.eco.internal.gui.slot
+
+import com.willfp.eco.core.Eco
+import com.willfp.eco.core.gui.slot.functional.SlotHandler
+import org.bukkit.Material
+import org.bukkit.inventory.ItemStack
+
+class EcoCaptivatorSlot : EcoSlot(
+    { _, _ -> ItemStack(Material.AIR) },
+    allowMovingItem,
+    allowMovingItem,
+    allowMovingItem,
+    allowMovingItem,
+    allowMovingItem,
+    { _, _, _ -> }
+) {
+    companion object {
+        val plugin = Eco.getHandler().ecoPlugin!!
+
+        val allowMovingItem = SlotHandler { event, _, _ ->
+            event.isCancelled = false
+        }
+    }
+
+    override fun isCaptive(): Boolean {
+        return true
+    }
+}

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/gui/slot/EcoFillerSlot.kt

@@ -0,0 +1,13 @@
+package com.willfp.eco.internal.gui.slot
+
+import org.bukkit.inventory.ItemStack
+
+class EcoFillerSlot(itemStack: ItemStack) : EcoSlot(
+    { _, _ -> itemStack },
+    { _, _, _ -> },
+    { _, _, _ -> },
+    { _, _, _ -> },
+    { _, _, _ -> },
+    { _, _, _ -> },
+    { _, _, _ -> }
+)

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/gui/slot/EcoSlot.kt

@@ -0,0 +1,58 @@
+package com.willfp.eco.internal.gui.slot
+
+import com.willfp.eco.core.gui.menu.Menu
+import com.willfp.eco.core.gui.slot.Slot
+import com.willfp.eco.core.gui.slot.functional.SlotHandler
+import com.willfp.eco.core.gui.slot.functional.SlotModifier
+import com.willfp.eco.core.gui.slot.functional.SlotProvider
+import com.willfp.eco.internal.gui.menu.MenuHandler
+import org.bukkit.entity.Player
+import org.bukkit.event.inventory.ClickType
+import org.bukkit.event.inventory.InventoryClickEvent
+import org.bukkit.inventory.ItemStack
+
+open class EcoSlot(
+    private val provider: SlotProvider,
+    private val onLeftClick: SlotHandler,
+    private val onRightClick: SlotHandler,
+    private val onShiftLeftClick: SlotHandler,
+    private val onShiftRightClick: SlotHandler,
+    private val onMiddleClick: SlotHandler,
+    private val modifier: SlotModifier
+) : Slot {
+
+    fun handleInventoryClick(
+        event: InventoryClickEvent,
+        menu: Menu
+    ) {
+        when (event.click) {
+            ClickType.LEFT -> this.onLeftClick.handle(event, this, menu)
+            ClickType.RIGHT -> this.onRightClick.handle(event, this, menu)
+            ClickType.SHIFT_LEFT -> this.onShiftLeftClick.handle(event, this, menu)
+            ClickType.SHIFT_RIGHT -> this.onShiftRightClick.handle(event, this, menu)
+            ClickType.MIDDLE -> this.onMiddleClick.handle(event, this, menu)
+            else -> {
+            }
+        }
+    }
+
+    override fun getItemStack(player: Player): ItemStack {
+        val menu = MenuHandler.getMenu(player.openInventory.topInventory)!!
+        val prev = provider.provide(player, menu)
+        modifier.modify(player, menu, prev)
+        return prev
+    }
+
+    fun getItemStack(
+        player: Player,
+        menu: Menu
+    ): ItemStack {
+        val prev = provider.provide(player, menu)
+        modifier.modify(player, menu, prev)
+        return prev
+    }
+
+    override fun isCaptive(): Boolean {
+        return false
+    }
+}

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/gui/slot/EcoSlotBuilder.kt

@@ -0,0 +1,66 @@
+package com.willfp.eco.internal.gui.slot
+
+import com.willfp.eco.core.gui.slot.Slot
+import com.willfp.eco.core.gui.slot.SlotBuilder
+import com.willfp.eco.core.gui.slot.functional.SlotHandler
+import com.willfp.eco.core.gui.slot.functional.SlotModifier
+import com.willfp.eco.core.gui.slot.functional.SlotProvider
+
+class EcoSlotBuilder(private val provider: SlotProvider) : SlotBuilder {
+    private var captive = false
+    var modifier: SlotModifier = SlotModifier{ player, menu, _ -> provider.provide(player, menu)}
+
+    private var onLeftClick =
+        SlotHandler { _, _, _ -> run { } }
+    private var onRightClick =
+        SlotHandler { _, _, _ -> run { } }
+    private var onShiftLeftClick =
+        SlotHandler { _, _, _ -> run { } }
+    private var onShiftRightClick =
+        SlotHandler { _, _, _ -> run { } }
+    private var onMiddleClick =
+        SlotHandler { _, _, _ -> run { } }
+
+    override fun onLeftClick(action: SlotHandler): SlotBuilder {
+        onLeftClick = action
+        return this
+    }
+
+    override fun onRightClick(action: SlotHandler): SlotBuilder {
+        onRightClick = action
+        return this
+    }
+
+    override fun onShiftLeftClick(action: SlotHandler): SlotBuilder {
+        onShiftLeftClick = action
+        return this
+    }
+
+    override fun onShiftRightClick(action: SlotHandler): SlotBuilder {
+        onShiftRightClick = action
+        return this
+    }
+
+    override fun onMiddleClick(action: SlotHandler): SlotBuilder {
+        onMiddleClick = action
+        return this
+    }
+
+    override fun setCaptive(): SlotBuilder {
+        captive = true
+        return this
+    }
+
+    override fun setModifier(modifier: SlotModifier): SlotBuilder {
+        this.modifier = modifier
+        return this
+    }
+
+    override fun build(): Slot {
+        return if (captive) {
+            EcoCaptivatorSlot()
+        } else {
+            EcoSlot(provider, onLeftClick, onRightClick, onShiftLeftClick, onShiftRightClick, onMiddleClick, modifier)
+        }
+    }
+}

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/integrations/PlaceholderIntegrationPAPI.kt

@@ -0,0 +1,52 @@
+package com.willfp.eco.internal.integrations
+
+import com.willfp.eco.core.EcoPlugin
+import com.willfp.eco.core.integrations.placeholder.PlaceholderIntegration
+import com.willfp.eco.core.integrations.placeholder.PlaceholderManager
+import me.clip.placeholderapi.PlaceholderAPI
+import me.clip.placeholderapi.expansion.PlaceholderExpansion
+import org.bukkit.entity.Player
+
+class PlaceholderIntegrationPAPI(private val plugin: EcoPlugin) : PlaceholderExpansion(), PlaceholderIntegration {
+    override fun persist(): Boolean {
+        return true
+    }
+
+    override fun canRegister(): Boolean {
+        return true
+    }
+
+    override fun getAuthor(): String {
+        return java.lang.String.join(", ", plugin.description.authors)
+    }
+
+    override fun getIdentifier(): String {
+        return plugin.description.name.lowercase()
+    }
+
+    override fun getVersion(): String {
+        return plugin.description.version
+    }
+
+    override fun onPlaceholderRequest(
+        player: Player?,
+        identifier: String
+    ): String {
+        return PlaceholderManager.getResult(player, identifier)
+    }
+
+    override fun registerIntegration() {
+        register()
+    }
+
+    override fun getPluginName(): String {
+        return "PlaceholderAPI"
+    }
+
+    override fun translate(
+        text: String,
+        player: Player?
+    ): String {
+        return PlaceholderAPI.setPlaceholders(player, text)
+    }
+}