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 0222ecaa87385fd6dbc508724cc3d9adfd98297c..2f3cccd0beff2fe7239357e8a4cd6d17231302c9 100644
--- a/src/main/java/org/bukkit/craftbukkit/CraftServer.java
+++ b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
@@ -287,6 +287,7 @@ 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 it.unimi.dsi.fastutil.objects.Object2ObjectMap<UUID, World> worldsByUUID = new it.unimi.dsi.fastutil.objects.Object2ObjectOpenHashMap<>(); // Gale - MultiPaper - CraftBukkit UUID to world map
     // private final Map<Class<?>, Registry<?>> registries = new HashMap<>(); // Paper - replace with RegistryAccess
     private YamlConfiguration configuration;
     private YamlConfiguration commandsConfiguration;
@@ -1530,6 +1531,7 @@ 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(Locale.ROOT));
         this.console.removeLevel(handle);
         return true;
@@ -1548,12 +1550,7 @@ 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
@@ -1571,6 +1568,7 @@ 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(Locale.ROOT), world);
     }