Moved Packet Adapters to singletons

Plugin/src/main/java/com/willfp/ecoenchants/display/AbstractPacketAdapter.java

@@ -9,11 +9,15 @@ import com.willfp.ecoenchants.EcoEnchantsPlugin;
 import java.util.Collections;
 
 public abstract class AbstractPacketAdapter extends PacketAdapter {
+    private static AbstractPacketAdapter instance;
+
     private final PacketType type;
 
     protected AbstractPacketAdapter(PacketType type) {
         super(EcoEnchantsPlugin.getInstance(), Collections.singletonList(type));
         this.type = type;
+
+        instance = this;
     }
 
     public void onReceive(PacketContainer packet) {}
@@ -42,6 +46,10 @@ public abstract class AbstractPacketAdapter extends PacketAdapter {
         onSend(event.getPacket());
     }
 
+    public static AbstractPacketAdapter getInstance() {
+        return instance;
+    }
+
     public final void register() {
         if(!EcoEnchantsPlugin.getInstance().protocolManager.getPacketListeners().contains(this)) {
             EcoEnchantsPlugin.getInstance().protocolManager.addPacketListener(this);

Plugin/src/main/java/com/willfp/ecoenchants/display/EnchantDisplay.java

@@ -27,7 +27,7 @@ import java.util.Map;
 /**
  * All methods and fields pertaining to showing players the enchantments on their items.
  */
-public class EnchantDisplay {
+public final class EnchantDisplay {
 
     /**
      * The meta key of the length of enchantments in lore (for legacy support)

Plugin/src/main/java/com/willfp/ecoenchants/display/packets/PacketOpenWindowMerchant.java

@@ -11,7 +11,7 @@ import java.util.List;
 import java.util.stream.Collectors;
 
 public class PacketOpenWindowMerchant extends AbstractPacketAdapter {
-    public PacketOpenWindowMerchant() {
+    private PacketOpenWindowMerchant() {
         super(PacketType.Play.Server.OPEN_WINDOW_MERCHANT);
     }
 

Plugin/src/main/java/com/willfp/ecoenchants/display/packets/PacketSetCreativeSlot.java

@@ -6,7 +6,7 @@ import com.willfp.ecoenchants.display.AbstractPacketAdapter;
 import com.willfp.ecoenchants.display.EnchantDisplay;
 
 public class PacketSetCreativeSlot extends AbstractPacketAdapter {
-    public PacketSetCreativeSlot() {
+    private PacketSetCreativeSlot() {
         super(PacketType.Play.Client.SET_CREATIVE_SLOT);
     }
 

Plugin/src/main/java/com/willfp/ecoenchants/display/packets/PacketSetSlot.java

@@ -6,7 +6,7 @@ import com.willfp.ecoenchants.display.AbstractPacketAdapter;
 import com.willfp.ecoenchants.display.EnchantDisplay;
 
 public class PacketSetSlot extends AbstractPacketAdapter {
-    public PacketSetSlot() {
+    private PacketSetSlot() {
         super(PacketType.Play.Server.SET_SLOT);
     }
 

Plugin/src/main/java/com/willfp/ecoenchants/display/packets/PacketWindowItems.java

@@ -6,7 +6,7 @@ import com.willfp.ecoenchants.display.AbstractPacketAdapter;
 import com.willfp.ecoenchants.display.EnchantDisplay;
 
 public class PacketWindowItems extends AbstractPacketAdapter {
-    public PacketWindowItems() {
+    private PacketWindowItems() {
         super(PacketType.Play.Server.WINDOW_ITEMS);
     }
 

Plugin/src/main/java/com/willfp/ecoenchants/loader/Loader.java

@@ -99,10 +99,10 @@ public class Loader {
 
         Bukkit.getLogger().info("Loading ProtocolLib...");
         EcoEnchantsPlugin.getInstance().protocolManager = ProtocolLibrary.getProtocolManager();
-        new PacketOpenWindowMerchant().register();
-        new PacketSetCreativeSlot().register();
-        new PacketSetSlot().register();
-        new PacketWindowItems().register();
+        PacketOpenWindowMerchant.getInstance().register();
+        PacketSetCreativeSlot.getInstance().register();
+        PacketSetSlot.getInstance().register();
+        PacketWindowItems.getInstance().register();
 
         /*
         Load land management support