Paper/patches/api/0253-Expand-world-key-API.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Jake Potrebic <jake.m.potrebic@gmail.com>
Date: Wed, 6 Jan 2021 00:34:10 -0800
Subject: [PATCH] Expand world key API


diff --git a/src/main/java/org/bukkit/Bukkit.java b/src/main/java/org/bukkit/Bukkit.java
index ceaa901fa830e904d6ac7a1727d1e7d185107e11..a60b1d57904eefeb832ab93fb0e556de9409e5ae 100644
--- a/src/main/java/org/bukkit/Bukkit.java
+++ b/src/main/java/org/bukkit/Bukkit.java
@@ -862,6 +862,18 @@ public final class Bukkit {
     public static World getWorld(@NotNull UUID uid) {
         return server.getWorld(uid);
     }
+    // Paper start
+    /**
+     * Gets the world from the given NamespacedKey
+     *
+     * @param worldKey the NamespacedKey of the world to retrieve
+     * @return a world with the given NamespacedKey, or null if none exists
+     */
+    @Nullable
+    public static World getWorld(@NotNull NamespacedKey worldKey) {
+        return server.getWorld(worldKey);
+    }
+    // Paper end
 
     /**
      * Create a new virtual {@link WorldBorder}.
diff --git a/src/main/java/org/bukkit/RegionAccessor.java b/src/main/java/org/bukkit/RegionAccessor.java
index 27eff0826d5b5b48697fefd9571886e7bbce74b1..d8b1fa79dc24138dc71e32c14bda71c1d570ed88 100644
--- a/src/main/java/org/bukkit/RegionAccessor.java
+++ b/src/main/java/org/bukkit/RegionAccessor.java
@@ -18,7 +18,7 @@ import org.jetbrains.annotations.Nullable;
  * A RegionAccessor gives access to getting, modifying and spawning {@link Biome}, {@link BlockState} and {@link Entity},
  * as well as generating some basic structures.
  */
-public interface RegionAccessor {
+public interface RegionAccessor extends Keyed { // Paper
 
     /**
      * Gets the {@link Biome} at the given {@link Location}.
@@ -452,5 +452,14 @@ public interface RegionAccessor {
      */
     @NotNull
     io.papermc.paper.world.MoonPhase getMoonPhase();
+
+    /**
+     * Get the world's key
+     *
+     * @return the world's key
+     */
+    @NotNull
+    @Override
+    NamespacedKey getKey();
     // Paper end
 }
diff --git a/src/main/java/org/bukkit/Server.java b/src/main/java/org/bukkit/Server.java
index fd3686688862fccc9989457cf3c1aaff777c66be..1074a858f441133c9c3049601411a00b0d37cf3e 100644
--- a/src/main/java/org/bukkit/Server.java
+++ b/src/main/java/org/bukkit/Server.java
@@ -723,6 +723,17 @@ public interface Server extends PluginMessageRecipient, net.kyori.adventure.audi
     @Nullable
     public World getWorld(@NotNull UUID uid);
 
+    // Paper start
+    /**
+     * Gets the world from the given NamespacedKey
+     *
+     * @param worldKey the NamespacedKey of the world to retrieve
+     * @return a world with the given NamespacedKey, or null if none exists
+     */
+    @Nullable
+    public World getWorld(@NotNull NamespacedKey worldKey);
+    // Paper end
+
     /**
      * Create a new virtual {@link WorldBorder}.
      * <p>
diff --git a/src/main/java/org/bukkit/UnsafeValues.java b/src/main/java/org/bukkit/UnsafeValues.java
index fb1efc7dfcfbfb823c8ad8fe2943adb99104aefe..1b2b0e6d10393b4f4d0716256aa4c87b57affbe1 100644
--- a/src/main/java/org/bukkit/UnsafeValues.java
+++ b/src/main/java/org/bukkit/UnsafeValues.java
@@ -173,5 +173,10 @@ public interface UnsafeValues {
      * Use this when sending custom packets, so that there are no collisions on the client or server.
      */
     public int nextEntityId();
+
+    /**
+     * Just don't use it.
+     */
+    @org.jetbrains.annotations.NotNull String getMainLevelName();
     // Paper end
 }
diff --git a/src/main/java/org/bukkit/WorldCreator.java b/src/main/java/org/bukkit/WorldCreator.java
index 27537aeabd3bd1b5383e6ecf775aa89e033aa2bc..afc0ce2eaa7cf48d1255fec7377103b1f7a99734 100644
--- a/src/main/java/org/bukkit/WorldCreator.java
+++ b/src/main/java/org/bukkit/WorldCreator.java
@@ -13,6 +13,7 @@ import org.jetbrains.annotations.Nullable;
  * Represents various types of options that may be used to create a world.
  */
 public class WorldCreator {
+    private final NamespacedKey key; // Paper
     private final String name;
     private long seed;
     private World.Environment environment = World.Environment.NORMAL;
@@ -30,11 +31,80 @@ public class WorldCreator {
      * @param name Name of the world that will be created
      */
     public WorldCreator(@NotNull String name) {
-        Preconditions.checkArgument(name != null, "World name cannot be null");
+        // Paper start
+        this(name, getWorldKey(name));
+    }
+
+    private static NamespacedKey getWorldKey(String name) {
+        final String mainLevelName = Bukkit.getUnsafe().getMainLevelName();
+        if (name.equals(mainLevelName)) {
+            return NamespacedKey.minecraft("overworld");
+        } else if (name.equals(mainLevelName + "_nether")) {
+            return NamespacedKey.minecraft("the_nether");
+        } else if (name.equals(mainLevelName + "_the_end")) {
+            return NamespacedKey.minecraft("the_end");
+        } else {
+            return NamespacedKey.minecraft(name.toLowerCase(java.util.Locale.ENGLISH).replace(" ", "_"));
+        }
+    }
 
-        this.name = name;
+    /**
+     * Creates an empty WorldCreator for the given world name and key
+     *
+     * @param levelName LevelName of the world that will be created
+     * @param worldKey NamespacedKey of the world that will be created
+     */
+    public WorldCreator(@NotNull String levelName, @NotNull NamespacedKey worldKey) {
+        if (levelName == null || worldKey == null) {
+            throw new IllegalArgumentException("World name and key cannot be null");
+        }
+        this.name = levelName;
         this.seed = (new Random()).nextLong();
+        this.key = worldKey;
+    }
+
+    /**
+     * Creates an empty WorldCreator for the given key.
+     * LevelName will be the Key part of the NamespacedKey.
+     *
+     * @param worldKey NamespacedKey of the world that will be created
+     */
+    public WorldCreator(@NotNull NamespacedKey worldKey) {
+        this(worldKey.getKey(), worldKey);
+    }
+
+    /**
+     * Gets the key for this WorldCreator
+     *
+     * @return the key
+     */
+    @NotNull
+    public NamespacedKey key() {
+        return key;
+    }
+
+    /**
+     * Creates an empty WorldCreator for the given world name and key
+     *
+     * @param levelName LevelName of the world that will be created
+     * @param worldKey NamespacedKey of the world that will be created
+     */
+    @NotNull
+    public static WorldCreator ofNameAndKey(@NotNull String levelName, @NotNull NamespacedKey worldKey) {
+        return new WorldCreator(levelName, worldKey);
+    }
+
+    /**
+     * Creates an empty WorldCreator for the given key.
+     * LevelName will be the Key part of the NamespacedKey.
+     *
+     * @param worldKey NamespacedKey of the world that will be created
+     */
+    @NotNull
+    public static WorldCreator ofKey(@NotNull NamespacedKey worldKey) {
+        return new WorldCreator(worldKey);
     }
+    // Paper end
 
     /**
      * Copies the options from the specified world