From fd3e920af22a4c66551ed2ff0d7d53a07be86dd0 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Sat, 4 Aug 2018 19:37:35 -0400
Subject: [PATCH] Provide Chunk Coordinates as a Long API

Allows you to easily access the chunks X/z as a long, and a method
to look up by the long key too.

diff --git a/src/main/java/org/bukkit/Chunk.java b/src/main/java/org/bukkit/Chunk.java
index 079b9febe..c75bce07a 100644
--- a/src/main/java/org/bukkit/Chunk.java
+++ b/src/main/java/org/bukkit/Chunk.java
@@ -23,6 +23,15 @@ public interface Chunk {
      */
     int getZ();
 
+    // Paper start
+    /**
+     * @return The Chunks X and Z coordinates packed into a long
+     */
+    default long getChunkKey() {
+        return (long) getX() & 0xffffffffL | ((long) getZ() & 0xffffffffL) << 32;
+    }
+    // Paper end
+
     /**
      * Gets the world containing this chunk
      *
diff --git a/src/main/java/org/bukkit/World.java b/src/main/java/org/bukkit/World.java
index f541107f7..7b166b213 100644
--- a/src/main/java/org/bukkit/World.java
+++ b/src/main/java/org/bukkit/World.java
@@ -166,6 +166,21 @@ public interface World extends PluginMessageRecipient, Metadatable {
      */
     public Chunk getChunkAt(Block block);
 
+    // Paper start
+    /**
+     * Gets the chunk at the specified chunk key, which is the X and Z packed into a long.
+     *
+     * See {@link Chunk#getChunkKey()} for easy access to the key, or you may calculate it as:
+     * long chunkKey = (long) chunkX & 0xffffffffL | ((long) chunkZ & 0xffffffffL) << 32;
+     *
+     * @param chunkKey The Chunk Key to look up the chunk by
+     * @return The chunk at the specified key
+     */
+    public default Chunk getChunkAt(long chunkKey) {
+        return getChunkAt((int) chunkKey, (int) (chunkKey >> 32));
+    }
+    // Paper end
+
     /**
      * Used by {@link World#getChunkAtAsync(Location,ChunkLoadCallback)} methods
      * to request a {@link Chunk} to be loaded, with this callback receiving
-- 
2.18.0