From 7d73bd83af6d5ec654addd52aff5bd878c96342f Mon Sep 17 00:00:00 2001
From: willies952002 <admin@domnian.com>
Date: Wed, 29 Aug 2018 00:37:42 -0400
Subject: [PATCH] Implement Force-Loaded Chunk API


diff --git a/src/main/java/net/minecraft/server/World.java b/src/main/java/net/minecraft/server/World.java
index 650e605b5b..2ff8536d59 100644
--- a/src/main/java/net/minecraft/server/World.java
+++ b/src/main/java/net/minecraft/server/World.java
@@ -3023,6 +3023,7 @@ public abstract class World implements IEntityAccess, GeneratorAccess, IIBlockAc
         return forcedchunk != null && forcedchunk.a().contains(ChunkCoordIntPair.a(i, j));
     }
 
+    public boolean setForcedChunk(int i, int j, boolean flag) { return b(i, j, flag); } // Paper - OBFHELPER
     public boolean b(int i, int j, boolean flag) {
         String s = "chunks";
         ForcedChunk forcedchunk = (ForcedChunk) this.a(this.worldProvider.getDimensionManager(), ForcedChunk::new, "chunks");
diff --git a/src/main/java/org/bukkit/craftbukkit/CraftChunk.java b/src/main/java/org/bukkit/craftbukkit/CraftChunk.java
index 12c6d850d2..55394e0c15 100644
--- a/src/main/java/org/bukkit/craftbukkit/CraftChunk.java
+++ b/src/main/java/org/bukkit/craftbukkit/CraftChunk.java
@@ -289,6 +289,18 @@ public class CraftChunk implements Chunk {
         Preconditions.checkArgument(0 <= z && z <= 15, "z out of range (expected 0-15, got %s)", z);
     }
 
+    // Paper start - Force-Loaded Chunk API
+    @Override
+    public boolean isForceLoaded() {
+        return getHandle().getWorld().isForcedChunk(this.x, this.z);
+    }
+
+    @Override
+    public void setForceLoaded(boolean force) {
+        getHandle().getWorld().setForcedChunk(this.x, this.z, force);
+    }
+    // Paper end
+
     static {
         Arrays.fill(emptySkyLight, (byte) 0xFF);
     }
diff --git a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
index 8565de51f4..08fd8850c6 100644
--- a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
+++ b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
@@ -590,6 +590,12 @@ public class CraftWorld implements World {
         return getChunkAt(location.getBlockX() >> 4, location.getBlockZ() >> 4);
     }
 
+    // Paper start
+    public boolean isChunkForceLoaded(int x, int z) {
+        return this.isChunkGenerated(x, z) && this.getHandle().isForcedChunk(x, z);
+    }
+    // Paper end
+
     public ChunkGenerator getGenerator() {
         return generator;
     }
-- 
2.19.0