From 60f931b9efb9140650ffb140af1dee18f557f8fe Mon Sep 17 00:00:00 2001
From: Dan Mulloy <dmulloy2@live.com>
Date: Sun, 22 Dec 2013 18:40:53 -0500
Subject: [PATCH] Fix Biome Decoration Crashes


diff --git a/src/main/java/net/minecraft/server/BiomeDecorator.java b/src/main/java/net/minecraft/server/BiomeDecorator.java
index b048d6c..2a5333a 100644
--- a/src/main/java/net/minecraft/server/BiomeDecorator.java
+++ b/src/main/java/net/minecraft/server/BiomeDecorator.java
@@ -1,5 +1,10 @@
 package net.minecraft.server;
 
+// Spigot Start
+import java.util.ArrayList;
+import java.util.Iterator;
+import java.util.List;
+// Spigot End
 import java.util.Random;
 
 public class BiomeDecorator {
@@ -39,6 +44,7 @@ public class BiomeDecorator {
     protected int G;
     protected int H;
     public boolean I;
+    private final List<Chunk> chunksToUnload = new ArrayList<Chunk>(); // Spigot
 
     public BiomeDecorator() {
         this.f = new WorldGenSand(Blocks.SAND, 7);
@@ -147,7 +153,7 @@ public class BiomeDecorator {
         for (j = 0; j < this.z; ++j) {
             k = this.c + this.b.nextInt(16) + 8;
             l = this.d + this.b.nextInt(16) + 8;
-            i1 = this.b.nextInt(this.a.getHighestBlockYAt(k, l) * 2);
+            i1 = this.b.nextInt(this.getHighestBlockYAt(k, l) * 2); // Spigot
             WorldGenerator worldgenerator = biomebase.b(this.b);
 
             worldgenerator.a(this.a, this.b, k, i1, l);
@@ -156,15 +162,15 @@ public class BiomeDecorator {
         for (j = 0; j < this.A; ++j) {
             k = this.c + this.b.nextInt(16) + 8;
             l = this.d + this.b.nextInt(16) + 8;
-            i1 = this.b.nextInt(this.a.getHighestBlockYAt(k, l) * 2);
-            (new WorldGenDeadBush(Blocks.DEAD_BUSH)).a(this.a, this.b, k, i1, l);
+            i1 = this.b.nextInt(this.getHighestBlockYAt(k, l) * 2);
+            (new WorldGenDeadBush(Blocks.DEAD_BUSH)).a(this.a, this.b, k, i1, l); // Spigot
         }
 
         for (j = 0; j < this.w; ++j) {
             k = this.c + this.b.nextInt(16) + 8;
             l = this.d + this.b.nextInt(16) + 8;
 
-            for (i1 = this.b.nextInt(this.a.getHighestBlockYAt(k, l) * 2); i1 > 0 && this.a.isEmpty(k, i1 - 1, l); --i1) {
+            for (i1 = this.b.nextInt(this.getHighestBlockYAt(k, l) * 2); i1 > 0 && this.a.isEmpty(k, i1 - 1, l); --i1) {  // Spigot
                 ;
             }
 
@@ -175,14 +181,14 @@ public class BiomeDecorator {
             if (this.b.nextInt(4) == 0) {
                 k = this.c + this.b.nextInt(16) + 8;
                 l = this.d + this.b.nextInt(16) + 8;
-                i1 = this.a.getHighestBlockYAt(k, l);
+                i1 = this.getHighestBlockYAt(k, l); // Spigot
                 this.q.a(this.a, this.b, k, i1, l);
             }
 
             if (this.b.nextInt(8) == 0) {
                 k = this.c + this.b.nextInt(16) + 8;
                 l = this.d + this.b.nextInt(16) + 8;
-                i1 = this.b.nextInt(this.a.getHighestBlockYAt(k, l) * 2);
+                i1 = this.b.nextInt(this.getHighestBlockYAt(k, l) * 2); // Spigot
                 this.r.a(this.a, this.b, k, i1, l);
             }
         }
@@ -190,42 +196,42 @@ public class BiomeDecorator {
         if (this.b.nextInt(4) == 0) {
             j = this.c + this.b.nextInt(16) + 8;
             k = this.d + this.b.nextInt(16) + 8;
-            l = this.b.nextInt(this.a.getHighestBlockYAt(j, k) * 2);
+            l = this.b.nextInt(this.getHighestBlockYAt(j, k) * 2); // Spigot
             this.q.a(this.a, this.b, j, l, k);
         }
 
         if (this.b.nextInt(8) == 0) {
             j = this.c + this.b.nextInt(16) + 8;
             k = this.d + this.b.nextInt(16) + 8;
-            l = this.b.nextInt(this.a.getHighestBlockYAt(j, k) * 2);
+            l = this.b.nextInt(this.getHighestBlockYAt(j, k) * 2); // Spigot
             this.r.a(this.a, this.b, j, l, k);
         }
 
         for (j = 0; j < this.C; ++j) {
             k = this.c + this.b.nextInt(16) + 8;
             l = this.d + this.b.nextInt(16) + 8;
-            i1 = this.b.nextInt(this.a.getHighestBlockYAt(k, l) * 2);
+            i1 = this.b.nextInt(this.getHighestBlockYAt(k, l) * 2); // Spigot
             this.t.a(this.a, this.b, k, i1, l);
         }
 
         for (j = 0; j < 10; ++j) {
             k = this.c + this.b.nextInt(16) + 8;
             l = this.d + this.b.nextInt(16) + 8;
-            i1 = this.b.nextInt(this.a.getHighestBlockYAt(k, l) * 2);
+            i1 = this.b.nextInt(this.getHighestBlockYAt(k, l) * 2); // Spigot
             this.t.a(this.a, this.b, k, i1, l);
         }
 
         if (this.b.nextInt(32) == 0) {
             j = this.c + this.b.nextInt(16) + 8;
             k = this.d + this.b.nextInt(16) + 8;
-            l = this.b.nextInt(this.a.getHighestBlockYAt(j, k) * 2);
+            l = this.b.nextInt(this.getHighestBlockYAt(j, k) * 2); // Spigot
             (new WorldGenPumpkin()).a(this.a, this.b, j, l, k);
         }
 
         for (j = 0; j < this.D; ++j) {
             k = this.c + this.b.nextInt(16) + 8;
             l = this.d + this.b.nextInt(16) + 8;
-            i1 = this.b.nextInt(this.a.getHighestBlockYAt(k, l) * 2);
+            i1 = this.b.nextInt(this.getHighestBlockYAt(k, l) * 2); // Spigot
             this.u.a(this.a, this.b, k, i1, l);
         }
 
@@ -244,6 +250,7 @@ public class BiomeDecorator {
                 (new WorldGenLiquids(Blocks.LAVA)).a(this.a, this.b, k, l, i1);
             }
         }
+        this.unloadChunks(); // Spigot - unload chunks we force loaded
     }
 
     protected void a(int i, WorldGenerator worldgenerator, int j, int k) {
@@ -276,4 +283,28 @@ public class BiomeDecorator {
         this.a(1, this.n, 0, 16);
         this.b(1, this.o, 16, 16);
     }
+
+    // Spigot start - force load chunks
+    private int getHighestBlockYAt(int i, int j)
+    {
+        // Make sure the chunk is loaded
+        if ( !this.a.isChunkLoaded( i >> 4, j >> 4 ) )
+        {
+            // If not, load it, then add it to our unload list
+            this.chunksToUnload.add( this.a.getChunkAt( i >> 4, j >> 4 ) );
+        }
+
+        return this.a.getHighestBlockYAt( i, j );
+    }
+
+    private void unloadChunks()
+    {
+        Iterator<Chunk> iter = this.chunksToUnload.iterator();
+        while ( iter.hasNext() )
+        {
+            this.a.getWorld().unloadChunk( iter.next().bukkitChunk );
+            iter.remove();
+        }
+    }
+    // Spigot end
 }
-- 
1.8.3.2