From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Martijn Muijsers <martijnmuijsers@live.nl>
Date: Sat, 24 Dec 2022 13:09:34 +0100
Subject: [PATCH] CraftBukkit UUID to world map

License: GPL-3.0 (https://www.gnu.org/licenses/gpl-3.0.html)
Gale - https://galemc.org

This patch is based on the following patch:
"Optimize CraftServer.getWorld(UUID)"
By: PureGero <puregero@gmail.com>
As part of: MultiPaper (https://github.com/MultiPaper/MultiPaper)
Licensed under: GPL-3.0 (https://www.gnu.org/licenses/gpl-3.0.html)

diff --git a/src/main/java/org/bukkit/craftbukkit/CraftServer.java b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
index 6d1baf7592a0d016b7d9a842ecc8660c42059490..d8e34ad5c2e79a0a766dd1cd33b9f7328b0ef563 100644
--- a/src/main/java/org/bukkit/craftbukkit/CraftServer.java
+++ b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
@@ -44,6 +44,9 @@ import java.util.logging.Level;
 import java.util.logging.Logger;
 import java.util.stream.Collectors;
 import javax.imageio.ImageIO;
+
+import it.unimi.dsi.fastutil.objects.Object2ObjectMap;
+import it.unimi.dsi.fastutil.objects.Object2ObjectOpenHashMap;
 import net.minecraft.advancements.Advancement;
 import net.minecraft.commands.CommandSourceStack;
 import net.minecraft.commands.Commands;
@@ -280,6 +283,7 @@ public final class CraftServer implements Server {
     protected final DedicatedServer console;
     protected final DedicatedPlayerList playerList;
     private final Map<String, World> worlds = new LinkedHashMap<String, World>();
+    private final Object2ObjectMap<UUID, World> worldsByUUID = new Object2ObjectOpenHashMap<>(); // Gale - MultiPaper - CraftBukkit UUID to world map
     private final Map<Class<?>, Registry<?>> registries = new HashMap<>();
     private YamlConfiguration configuration;
     private YamlConfiguration commandsConfiguration;
@@ -1430,6 +1434,7 @@ public final class CraftServer implements Server {
             this.getLogger().log(Level.SEVERE, null, ex);
         }
 
+        this.worldsByUUID.remove(world.getUID()); // Gale - MultiPaper - CraftBukkit UUID to world map
         this.worlds.remove(world.getName().toLowerCase(java.util.Locale.ENGLISH));
         this.console.removeLevel(handle);
         return true;
@@ -1448,12 +1453,7 @@ public final class CraftServer implements Server {
 
     @Override
     public World getWorld(UUID uid) {
-        for (World world : this.worlds.values()) {
-            if (world.getUID().equals(uid)) {
-                return world;
-            }
-        }
-        return null;
+        return this.worldsByUUID.get(uid); // Gale - MultiPaper - CraftBukkit UUID to world map
     }
 
     // Paper start
@@ -1471,6 +1471,7 @@ public final class CraftServer implements Server {
             System.out.println("World " + world.getName() + " is a duplicate of another world and has been prevented from loading. Please delete the uid.dat file from " + world.getName() + "'s world directory if you want to be able to load the duplicate world.");
             return;
         }
+        this.worldsByUUID.put(world.getUID(), world); // Gale - MultiPaper - CraftBukkit UUID to world map
         this.worlds.put(world.getName().toLowerCase(java.util.Locale.ENGLISH), world);
     }