[Bleeding] Undo changes to the tree WorldGenerators.

- All StructureGrowEvent handling for these is in BlockSapling now, using a BlockChangeDelegate to collect the data.
- Moved StructureGrowDelegate into a separate class

7 files changed, 109 insertions, 240 deletions

diff --git a/src/main/java/net/minecraft/server/BlockSapling.java b/src/main/java/net/minecraft/server/BlockSapling.java
index 7b3d7739..0040474b 100644
--- a/src/main/java/net/minecraft/server/BlockSapling.java
+++ b/src/main/java/net/minecraft/server/BlockSapling.java
@@ -1,12 +1,12 @@
 package net.minecraft.server;
 
-import java.util.ArrayList;
 import java.util.Random;
 // CraftBukkit start
-import org.bukkit.BlockChangeDelegate;
+import org.bukkit.Bukkit;
 import org.bukkit.Location;
 import org.bukkit.TreeType;
 import org.bukkit.block.BlockState;
+import org.bukkit.craftbukkit.util.StructureGrowDelegate;
 import org.bukkit.entity.Player;
 import org.bukkit.event.world.StructureGrowEvent;
 // CraftBukkit end
@@ -45,34 +45,44 @@ public class BlockSapling extends BlockFlower {
         int l = world.getData(i, j, k) & 3;
 
         world.setRawTypeId(i, j, k, 0);
-        // CraftBukkit start - fixes client updates on recently grown trees
+        // CraftBukkit start - records tree generation and calls StructureGrowEvent
+        StructureGrowDelegate delegate = new StructureGrowDelegate(world);
+        TreeType treeType;
         boolean grownTree;
-        BlockChangeWithNotify delegate = new BlockChangeWithNotify(world);
-        StructureGrowEvent event = null;
-        Location location = new Location(world.getWorld(), i, j, k);
         // All of these are 'false' because we need the 'raw' calls so the block-delegate works
         if (l == 1) {
-            event = new StructureGrowEvent(location, TreeType.REDWOOD, bonemeal, player, new ArrayList<BlockState>());
-            grownTree = new WorldGenTaiga2(false).generate(delegate, random, i, j, k, event, itemstack, world.getWorld());
+            treeType = TreeType.REDWOOD;
+            grownTree = new WorldGenTaiga2(false).generate(delegate, random, i, j, k);
         } else if (l == 2) {
-            event = new StructureGrowEvent(location, TreeType.BIRCH, bonemeal, player, new ArrayList<BlockState>());
-            grownTree = new WorldGenForest(false).generate(delegate, random, i, j, k, event, itemstack, world.getWorld());
+            treeType = TreeType.BIRCH;
+            grownTree = new WorldGenForest(false).generate(delegate, random, i, j, k);
         } else {
             if (random.nextInt(10) == 0) {
-                event = new StructureGrowEvent(location, TreeType.BIG_TREE, bonemeal, player, new ArrayList<BlockState>());
-                grownTree = new WorldGenBigTree(false).generate(delegate, random, i, j, k, event, itemstack, world.getWorld());
+                treeType = TreeType.BIG_TREE;
+                grownTree = new WorldGenBigTree(false).generate(delegate, random, i, j, k);
             } else {
-                event = new StructureGrowEvent(location, TreeType.TREE, bonemeal, player, new ArrayList<BlockState>());
-                grownTree = new WorldGenTrees(false).generate(delegate, random, i, j, k, event, itemstack, world.getWorld());
+                treeType = TreeType.TREE;
+                grownTree = new WorldGenTrees(false).generate(delegate, random, i, j, k);
             }
         }
-        if (event == null) {
-            return;
-        }
-        if (event.isFromBonemeal() && itemstack != null) {
-            --itemstack.count;
+
+        if (grownTree) {
+            Location location = new Location(world.getWorld(), i, j, k);
+            StructureGrowEvent event = new StructureGrowEvent(location, treeType, bonemeal, player, delegate.getBlocks());
+            Bukkit.getPluginManager().callEvent(event);
+            if (event.isCancelled()) {
+                grownTree = false;
+            } else {
+                for (BlockState state : event.getBlocks()) {
+                    state.update(true);
+                }
+                if (event.isFromBonemeal() && itemstack != null) {
+                    --itemstack.count;
+                }
+            }
         }
-        if (!grownTree || event.isCancelled()) {
+
+        if (!grownTree) {
             // CraftBukkit end
             world.setRawTypeIdAndData(i, j, k, this.id, l);
         }
@@ -81,31 +91,4 @@ public class BlockSapling extends BlockFlower {
     protected int getDropData(int i) {
         return i & 3;
     }
-
-    // CraftBukkit start
-    private class BlockChangeWithNotify implements BlockChangeDelegate {
-
-        World world;
-
-        BlockChangeWithNotify(World world) {
-            this.world = world;
-        }
-
-        public boolean setRawTypeId(int x, int y, int z, int type) {
-            return this.world.setTypeId(x, y, z, type);
-        }
-
-        public boolean setRawTypeIdAndData(int x, int y, int z, int type, int data) {
-            return this.world.setTypeIdAndData(x, y, z, type, data);
-        }
-
-        public int getTypeId(int x, int y, int z) {
-            return this.world.getTypeId(x, y, z);
-        }
-
-        public int getHeight() {
-            return world.height;
-        }
-    }
-    // CraftBukkit end
 }
diff --git a/src/main/java/net/minecraft/server/WorldGenBigTree.java b/src/main/java/net/minecraft/server/WorldGenBigTree.java
index 27b00ef3..c4d3f17a 100644
--- a/src/main/java/net/minecraft/server/WorldGenBigTree.java
+++ b/src/main/java/net/minecraft/server/WorldGenBigTree.java
@@ -2,23 +2,13 @@ package net.minecraft.server;
 
 import java.util.Random;
 
-// CraftBukkit start
-import org.bukkit.BlockChangeDelegate;
-import org.bukkit.Bukkit;
-import org.bukkit.block.BlockState;
-import org.bukkit.craftbukkit.CraftWorld;
-import org.bukkit.event.world.StructureGrowEvent;
-// CraftBukkit end
+import org.bukkit.BlockChangeDelegate; // CraftBukkit
 
 public class WorldGenBigTree extends WorldGenerator {
 
     static final byte[] a = new byte[] { (byte) 2, (byte) 0, (byte) 0, (byte) 1, (byte) 2, (byte) 1};
     Random b = new Random();
-    // CraftBukkit start
-    BlockChangeDelegate world;
-    StructureGrowEvent event;
-    CraftWorld bukkitWorld;
-    // CraftBukkit end
+    BlockChangeDelegate world;  // CraftBukkit
     int[] d = new int[] { 0, 0, 0};
     int e = 0;
     int f;
@@ -131,15 +121,7 @@ public class WorldGenBigTree extends WorldGenerator {
                     if (l1 != 0 && l1 != 18) {
                         ++k1;
                     } else {
-                        // CraftBukkit start
-                        if (event == null) {
-                            this.setTypeAndData(this.world, aint1[0], aint1[1], aint1[2], l, 0);
-                        } else {
-                            BlockState state = bukkitWorld.getBlockAt(aint1[0], aint1[1], aint1[2]).getState();
-                            state.setTypeId(l);
-                            event.getBlocks().add(state);
-                        }
-                        // CraftBukkit end
+                        this.setTypeAndData(this.world, aint1[0], aint1[1], aint1[2], l, 0);
                         ++k1;
                     }
                 }
@@ -215,15 +197,7 @@ public class WorldGenBigTree extends WorldGenerator {
                 aint3[b1] = MathHelper.floor((double) (aint[b1] + j) + 0.5D);
                 aint3[b2] = MathHelper.floor((double) aint[b2] + (double) j * d0 + 0.5D);
                 aint3[b3] = MathHelper.floor((double) aint[b3] + (double) j * d1 + 0.5D);
-                // CraftBukkit start
-                if (event == null) {
-                    this.setTypeAndData(this.world, aint3[0], aint3[1], aint3[2], i, 0);
-                } else {
-                    BlockState state = bukkitWorld.getBlockAt(aint3[0], aint3[1], aint3[2]).getState();
-                    state.setTypeId(i);
-                    event.getBlocks().add(state);
-                }
-                // CraftBukkit end
+                this.setTypeAndData(this.world, aint3[0], aint3[1], aint3[2], i, 0);
             }
         }
     }
@@ -368,12 +342,10 @@ public class WorldGenBigTree extends WorldGenerator {
         // BlockChangeDelegate and then we can implicitly cast World to
         // WorldServer (a safe cast, AFAIK) and no code will be broken. This
         // then allows plugins to catch manually-invoked generation events
-        return this.generate((BlockChangeDelegate) world, random, i, j, k, null, null, world.getWorld());
+        return this.generate((BlockChangeDelegate) world, random, i, j, k);
     }
 
-    public boolean generate(BlockChangeDelegate world, Random random, int i, int j, int k, StructureGrowEvent event, ItemStack itemstack, CraftWorld bukkitWorld) {
-        this.event = event;
-        this.bukkitWorld = bukkitWorld;
+    public boolean generate(BlockChangeDelegate world, Random random, int i, int j, int k) {
         // CraftBukkit end
         this.world = world;
         long l = random.nextLong();
@@ -393,17 +365,6 @@ public class WorldGenBigTree extends WorldGenerator {
             this.b();
             this.c();
             this.d();
-            // CraftBukkit start
-            if (event != null) {
-                Bukkit.getPluginManager().callEvent(event);
-                if (!event.isCancelled()) {
-                    world.setRawTypeId(i, j, k, 0);
-                    for (BlockState state : event.getBlocks()) {
-                        state.update(true);
-                    }
-                }
-            }
-            // CraftBukkit end
             return true;
         }
     }
diff --git a/src/main/java/net/minecraft/server/WorldGenForest.java b/src/main/java/net/minecraft/server/WorldGenForest.java
index b3d8113b..831a3b25 100644
--- a/src/main/java/net/minecraft/server/WorldGenForest.java
+++ b/src/main/java/net/minecraft/server/WorldGenForest.java
@@ -2,14 +2,7 @@ package net.minecraft.server;
 
 import java.util.Random;
 
-// CraftBukkit start
-import org.bukkit.BlockChangeDelegate;
-import org.bukkit.Bukkit;
-import org.bukkit.block.BlockState;
-import org.bukkit.craftbukkit.CraftWorld;
-import org.bukkit.event.world.StructureGrowEvent;
-import org.bukkit.material.MaterialData;
-// CraftBukkit end
+import org.bukkit.BlockChangeDelegate; // CraftBukkit
 
 public class WorldGenForest extends WorldGenerator {
 
@@ -23,10 +16,10 @@ public class WorldGenForest extends WorldGenerator {
         // BlockChangeDelegate and then we can implicitly cast World to
         // WorldServer (a safe cast, AFAIK) and no code will be broken. This
         // then allows plugins to catch manually-invoked generation events
-        return this.generate((BlockChangeDelegate) world, random, i, j, k, null, null, world.getWorld());
+        return this.generate((BlockChangeDelegate) world, random, i, j, k);
     }
 
-    public boolean generate(BlockChangeDelegate world, Random random, int i, int j, int k, StructureGrowEvent event, ItemStack itemstack, CraftWorld bukkitWorld) {
+    public boolean generate(BlockChangeDelegate world, Random random, int i, int j, int k) {
         // CraftBukkit end
         int l = random.nextInt(3) + 5;
         boolean flag = true;
@@ -67,15 +60,7 @@ public class WorldGenForest extends WorldGenerator {
             } else {
                 i1 = world.getTypeId(i, j - 1, k);
                 if ((i1 == Block.GRASS.id || i1 == Block.DIRT.id) && j < world.getHeight() - l - 1) { // CraftBukkit
-                    // CraftBukkit start
-                    if (event == null) {
-                        world.setRawTypeId(i, j - 1, k, Block.DIRT.id);
-                    } else {
-                        BlockState dirtState = bukkitWorld.getBlockAt(i, j - 1, k).getState();
-                        dirtState.setTypeId(Block.DIRT.id);
-                        event.getBlocks().add(dirtState);
-                    }
-                    // CraftBukkit end
+                    world.setRawTypeId(i, j - 1, k, Block.DIRT.id);
                     int i2;
 
                     for (i2 = j - 3 + l; i2 <= j + l; ++i2) {
@@ -89,16 +74,7 @@ public class WorldGenForest extends WorldGenerator {
                                 int l2 = k2 - k;
 
                                 if ((Math.abs(j2) != k1 || Math.abs(l2) != k1 || random.nextInt(2) != 0 && j1 != 0) && !Block.o[world.getTypeId(l1, i2, k2)]) {
-                                    // CraftBukkit start
-                                    if (event == null) {
-                                        this.setTypeAndData(world, l1, i2, k2, Block.LEAVES.id, 2);
-                                    } else {
-                                        BlockState leavesState = bukkitWorld.getBlockAt(l1, i2, k2).getState();
-                                        leavesState.setTypeId(Block.LEAVES.id);
-                                        leavesState.setData(new MaterialData(Block.LEAVES.id, (byte) 2));
-                                        event.getBlocks().add(leavesState);
-                                    }
-                                    // CraftBukkit end
+                                    this.setTypeAndData(world, l1, i2, k2, Block.LEAVES.id, 2);
                                 }
                             }
                         }
@@ -107,28 +83,10 @@ public class WorldGenForest extends WorldGenerator {
                     for (i2 = 0; i2 < l; ++i2) {
                         j1 = world.getTypeId(i, j + i2, k);
                         if (j1 == 0 || j1 == Block.LEAVES.id) {
-                            // CraftBukkit start
-                            if (event == null) {
-                                this.setTypeAndData(world, i, j + i2, k, Block.LOG.id, 2);
-                            } else {
-                                BlockState logState = bukkitWorld.getBlockAt(i, j + i2, k).getState();
-                                logState.setTypeId(Block.LOG.id);
-                                logState.setData(new MaterialData(Block.LOG.id, (byte) 2));
-                                event.getBlocks().add(logState);
-                            }
-                            // CraftBukkit end
-                        }
-                    }
-                    // CraftBukkit start
-                    if (event != null) {
-                        Bukkit.getPluginManager().callEvent(event);
-                        if (!event.isCancelled()) {
-                            for (BlockState state : event.getBlocks()) {
-                                state.update(true);
-                            }
+                            this.setTypeAndData(world, i, j + i2, k, Block.LOG.id, 2);
                         }
                     }
-                    // CraftBukkit end
+
                     return true;
                 } else {
                     return false;
diff --git a/src/main/java/net/minecraft/server/WorldGenTaiga2.java b/src/main/java/net/minecraft/server/WorldGenTaiga2.java
index 9e13dc75..f7f92159 100644
--- a/src/main/java/net/minecraft/server/WorldGenTaiga2.java
+++ b/src/main/java/net/minecraft/server/WorldGenTaiga2.java
@@ -2,14 +2,7 @@ package net.minecraft.server;
 
 import java.util.Random;
 
-// CraftBukkit start
-import org.bukkit.BlockChangeDelegate;
-import org.bukkit.Bukkit;
-import org.bukkit.block.BlockState;
-import org.bukkit.craftbukkit.CraftWorld;
-import org.bukkit.event.world.StructureGrowEvent;
-import org.bukkit.material.MaterialData;
-// CraftBukkit end
+import org.bukkit.BlockChangeDelegate; // CraftBukkit
 
 public class WorldGenTaiga2 extends WorldGenerator {
 
@@ -23,10 +16,10 @@ public class WorldGenTaiga2 extends WorldGenerator {
         // BlockChangeDelegate and then we can implicitly cast World to
         // WorldServer (a safe cast, AFAIK) and no code will be broken. This
         // then allows plugins to catch manually-invoked generation events
-        return this.generate((BlockChangeDelegate) world, random, i, j, k, null, null, world.getWorld());
+        return this.generate((BlockChangeDelegate) world, random, i, j, k);
     }
 
-    public boolean generate(BlockChangeDelegate world, Random random, int i, int j, int k, StructureGrowEvent event, ItemStack itemstack, CraftWorld bukkitWorld) {
+    public boolean generate(BlockChangeDelegate world, Random random, int i, int j, int k) {
         // CraftBukkit end
         int l = random.nextInt(4) + 6;
         int i1 = 1 + random.nextInt(2);
@@ -68,15 +61,7 @@ public class WorldGenTaiga2 extends WorldGenerator {
             } else {
                 l1 = world.getTypeId(i, j - 1, k);
                 if ((l1 == Block.GRASS.id || l1 == Block.DIRT.id) && j < world.getHeight() - l - 1) { // CraftBukkit
-                    // CraftBukkit start
-                    if (event == null) {
-                        world.setRawTypeId(i, j - 1, k, Block.DIRT.id);
-                    } else {
-                        BlockState dirtState = bukkitWorld.getBlockAt(i, j - 1, k).getState();
-                        dirtState.setTypeId(Block.DIRT.id);
-                        event.getBlocks().add(dirtState);
-                    }
-                    // CraftBukkit end
+                    world.setRawTypeId(i, j - 1, k, Block.DIRT.id);
                     k2 = random.nextInt(2);
                     i2 = 1;
                     byte b0 = 0;
@@ -94,16 +79,7 @@ public class WorldGenTaiga2 extends WorldGenerator {
                                 int i4 = l3 - k;
 
                                 if ((Math.abs(k3) != k2 || Math.abs(i4) != k2 || k2 <= 0) && !Block.o[world.getTypeId(i3, j3, l3)]) {
-                                    // CraftBukkit start
-                                    if (event == null) {
-                                        this.setTypeAndData(world, i3, j3, l3, Block.LEAVES.id, 1);
-                                    } else {
-                                        BlockState leavesState = bukkitWorld.getBlockAt(i3, j3, l3).getState();
-                                        leavesState.setTypeId(Block.LEAVES.id);
-                                        leavesState.setData(new MaterialData(Block.LEAVES.id, (byte) 1));
-                                        event.getBlocks().add(leavesState);
-                                    }
-                                    // CraftBukkit end
+                                    this.setTypeAndData(world, i3, j3, l3, Block.LEAVES.id, 1);
                                 }
                             }
                         }
@@ -125,28 +101,10 @@ public class WorldGenTaiga2 extends WorldGenerator {
                     for (j3 = 0; j3 < l - j2; ++j3) {
                         i3 = world.getTypeId(i, j + j3, k);
                         if (i3 == 0 || i3 == Block.LEAVES.id) {
-                            // CraftBukkit start
-                            if (event == null) {
-                                this.setTypeAndData(world, i, j + j3, k, Block.LOG.id, 1);
-                            } else {
-                                BlockState logState = bukkitWorld.getBlockAt(i, j + j3, k).getState();
-                                logState.setTypeId(Block.LOG.id);
-                                logState.setData(new MaterialData(Block.LOG.id, (byte) 1));
-                                event.getBlocks().add(logState);
-                            }
-                            // CraftBukkit end
-                        }
-                    }
-                    // CraftBukkit start
-                    if (event != null) {
-                        Bukkit.getPluginManager().callEvent(event);
-                        if (!event.isCancelled()) {
-                            for (BlockState state : event.getBlocks()) {
-                                state.update(true);
-                            }
+                            this.setTypeAndData(world, i, j + j3, k, Block.LOG.id, 1);
                         }
                     }
-                    // CraftBukkit end
+
                     return true;
                 } else {
                     return false;
diff --git a/src/main/java/net/minecraft/server/WorldGenTrees.java b/src/main/java/net/minecraft/server/WorldGenTrees.java
index 899cc964..630f619b 100644
--- a/src/main/java/net/minecraft/server/WorldGenTrees.java
+++ b/src/main/java/net/minecraft/server/WorldGenTrees.java
@@ -2,13 +2,7 @@ package net.minecraft.server;
 
 import java.util.Random;
 
-// CraftBukkit start
-import org.bukkit.BlockChangeDelegate;
-import org.bukkit.Bukkit;
-import org.bukkit.block.BlockState;
-import org.bukkit.craftbukkit.CraftWorld;
-import org.bukkit.event.world.StructureGrowEvent;
-// CraftBukkit end
+import org.bukkit.BlockChangeDelegate; // CraftBukkit
 
 public class WorldGenTrees extends WorldGenerator {
 
@@ -22,10 +16,10 @@ public class WorldGenTrees extends WorldGenerator {
         // BlockChangeDelegate and then we can implicitly cast World to
         // WorldServer (a safe cast, AFAIK) and no code will be broken. This
         // then allows plugins to catch manually-invoked generation events
-        return this.generate((BlockChangeDelegate) world, random, i, j, k, null, null, world.getWorld());
+        return this.generate((BlockChangeDelegate) world, random, i, j, k);
     }
 
-    public boolean generate(BlockChangeDelegate world, Random random, int i, int j, int k, StructureGrowEvent event, ItemStack itemstack, CraftWorld bukkitWorld) {
+    public boolean generate(BlockChangeDelegate world, Random random, int i, int j, int k) {
         // CraftBukkit end
         int l = random.nextInt(3) + 4;
         boolean flag = true;
@@ -66,15 +60,7 @@ public class WorldGenTrees extends WorldGenerator {
             } else {
                 i1 = world.getTypeId(i, j - 1, k);
                 if ((i1 == Block.GRASS.id || i1 == Block.DIRT.id) && j < world.getHeight() - l - 1) { // CraftBukkit
-                    // CraftBukkit start
-                    if (event == null) {
-                        world.setRawTypeId(i, j - 1, k, Block.DIRT.id);
-                    } else {
-                        BlockState dirtState = bukkitWorld.getBlockAt(i, j - 1, k).getState();
-                        dirtState.setTypeId(Block.DIRT.id);
-                        event.getBlocks().add(dirtState);
-                    }
-                    // CraftBukkit end
+                    world.setRawTypeId(i, j - 1, k, Block.DIRT.id);
 
                     int i2;
 
@@ -89,15 +75,7 @@ public class WorldGenTrees extends WorldGenerator {
                                 int l2 = k2 - k;
 
                                 if ((Math.abs(j2) != k1 || Math.abs(l2) != k1 || random.nextInt(2) != 0 && j1 != 0) && !Block.o[world.getTypeId(l1, i2, k2)]) {
-                                    // CraftBukkit start
-                                    if (event == null) {
-                                        this.setTypeAndData(world, l1, i2, k2, Block.LEAVES.id, 0);
-                                    } else {
-                                        BlockState leavesState = bukkitWorld.getBlockAt(l1, i2, k2).getState();
-                                        leavesState.setTypeId(Block.LEAVES.id);
-                                        event.getBlocks().add(leavesState);
-                                    }
-                                    // CraftBukkit end
+                                    this.setTypeAndData(world, l1, i2, k2, Block.LEAVES.id, 0);
                                 }
                             }
                         }
@@ -106,27 +84,10 @@ public class WorldGenTrees extends WorldGenerator {
                     for (i2 = 0; i2 < l; ++i2) {
                         j1 = world.getTypeId(i, j + i2, k);
                         if (j1 == 0 || j1 == Block.LEAVES.id) {
-                            // CraftBukkit start
-                            if (event == null) {
-                                this.setTypeAndData(world, i, j + i2, k, Block.LOG.id, 0);
-                            } else {
-                                BlockState logState = bukkitWorld.getBlockAt(i, j + i2, k).getState();
-                                logState.setTypeId(Block.LOG.id);
-                                event.getBlocks().add(logState);
-                            }
-                            // CraftBukkit end
-                        }
-                    }
-                    // CraftBukkit start
-                    if (event != null) {
-                        Bukkit.getPluginManager().callEvent(event);
-                        if (!event.isCancelled()) {
-                            for (BlockState state : event.getBlocks()) {
-                                state.update(true);
-                            }
+                            this.setTypeAndData(world, i, j + i2, k, Block.LOG.id, 0);
                         }
                     }
-                    // CraftBukkit end
+
                     return true;
                 } else {
                     return false;
diff --git a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
index 744113b7..0b434f32 100644
--- a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
+++ b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
@@ -365,16 +365,16 @@ public class CraftWorld implements World {
     public boolean generateTree(Location loc, TreeType type, BlockChangeDelegate delegate) {
         switch (type) {
         case BIG_TREE:
-            return new WorldGenBigTree(false).generate(delegate, rand, loc.getBlockX(), loc.getBlockY(), loc.getBlockZ(), null, null, null);
+            return new WorldGenBigTree(false).generate(delegate, rand, loc.getBlockX(), loc.getBlockY(), loc.getBlockZ());
         case BIRCH:
-            return new WorldGenForest(false).generate(delegate, rand, loc.getBlockX(), loc.getBlockY(), loc.getBlockZ(), null, null, null);
+            return new WorldGenForest(false).generate(delegate, rand, loc.getBlockX(), loc.getBlockY(), loc.getBlockZ());
         case REDWOOD:
-            return new WorldGenTaiga2(false).generate(delegate, rand, loc.getBlockX(), loc.getBlockY(), loc.getBlockZ(), null, null, null);
+            return new WorldGenTaiga2(false).generate(delegate, rand, loc.getBlockX(), loc.getBlockY(), loc.getBlockZ());
         case TALL_REDWOOD:
             return new WorldGenTaiga1().generate(delegate, rand, loc.getBlockX(), loc.getBlockY(), loc.getBlockZ());
         case TREE:
         default:
-            return new WorldGenTrees(false).generate(delegate, rand, loc.getBlockX(), loc.getBlockY(), loc.getBlockZ(), null, null, null);
+            return new WorldGenTrees(false).generate(delegate, rand, loc.getBlockX(), loc.getBlockY(), loc.getBlockZ());
         }
     }
 
diff --git a/src/main/java/org/bukkit/craftbukkit/util/StructureGrowDelegate.java b/src/main/java/org/bukkit/craftbukkit/util/StructureGrowDelegate.java
new file mode 100644
index 00000000..125772d4
--- /dev/null
+++ b/src/main/java/org/bukkit/craftbukkit/util/StructureGrowDelegate.java
@@ -0,0 +1,48 @@
+package org.bukkit.craftbukkit.util;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import net.minecraft.server.World;
+
+import org.bukkit.BlockChangeDelegate;
+import org.bukkit.block.BlockState;
+import org.bukkit.craftbukkit.CraftWorld;
+import org.bukkit.material.MaterialData;
+
+public class StructureGrowDelegate implements BlockChangeDelegate {
+    private final CraftWorld world;
+    private final List<BlockState> blocks = new ArrayList<BlockState>();
+
+    public StructureGrowDelegate(World world) {
+        this.world = world.getWorld();
+    }
+
+    @Override
+    public boolean setRawTypeId(int x, int y, int z, int type) {
+        return setRawTypeIdAndData(x, y, z, type, 0);
+    }
+
+    @Override
+    public boolean setRawTypeIdAndData(int x, int y, int z, int type, int data) {
+        BlockState state = world.getBlockAt(x, y, z).getState();
+        state.setTypeId(type);
+        state.setData(new MaterialData(type, (byte) data));
+        blocks.add(state);
+        return true;
+    }
+
+    @Override
+    public int getTypeId(int x, int y, int z) {
+        return world.getBlockTypeIdAt(x, y, z);
+    }
+
+    @Override
+    public int getHeight() {
+        return world.getMaxHeight();
+    }
+
+    public List<BlockState> getBlocks() {
+        return blocks;
+    }
+}