KCauldronX/patches/net/minecraft/item/ItemStack.java.patch

--- ../src-base/minecraft/net/minecraft/item/ItemStack.java
+++ ../src-work/minecraft/net/minecraft/item/ItemStack.java
@@ -35,6 +35,20 @@
 import net.minecraft.world.World;
 import net.minecraftforge.event.ForgeEventFactory;
 
+import org.bukkit.craftbukkit.util.CraftMagicNumbers; // CraftBukkit
+import net.minecraft.entity.player.EntityPlayerMP; // Spigot
+// Cauldron start
+import net.minecraft.block.BlockSapling;
+import net.minecraft.block.BlockMushroom;
+
+import org.bukkit.Location;
+import org.bukkit.TreeType;
+import org.bukkit.block.BlockState;
+import org.bukkit.craftbukkit.block.CraftBlockState;
+import org.bukkit.entity.Player;
+import org.bukkit.event.world.StructureGrowEvent;
+// Cauldron end
+
 public final class ItemStack
 {
     public static final DecimalFormat field_111284_a = new DecimalFormat("#.###");
@@ -43,7 +57,12 @@
     private Item field_151002_e;
     public NBTTagCompound stackTagCompound;
     int itemDamage;
-    private EntityItemFrame itemFrame;
+    // Cauldron - due to a bug in Gson(https://code.google.com/p/google-gson/issues/detail?id=440), a stackoverflow 
+    //         can occur when gson attempts to resolve a field of a class that points to itself.
+    //         As a temporary workaround, we will prevent serialization for this object until the bug is fixed.
+    //         This fixes EE3's serialization of ItemStack.
+    private transient EntityItemFrame itemFrame;
+    public static EntityPlayer currentPlayer; // Cauldron - reference to current player calling onItemUse
     private static final String __OBFID = "CL_00000043";
 
     private cpw.mods.fml.common.registry.RegistryDelegate<Item> delegate;
@@ -126,12 +145,120 @@
     public boolean tryPlaceItemIntoWorld(EntityPlayer p_77943_1_, World p_77943_2_, int p_77943_3_, int p_77943_4_, int p_77943_5_, int p_77943_6_, float p_77943_7_, float p_77943_8_, float p_77943_9_)
     {
         if (!p_77943_2_.isRemote) return net.minecraftforge.common.ForgeHooks.onPlaceItemIntoWorld(this, p_77943_1_, p_77943_2_, p_77943_3_, p_77943_4_, p_77943_5_, p_77943_6_, p_77943_7_, p_77943_8_, p_77943_9_);
+        // Cauldron start - handle all placement events here
+        int meta = this.getItemDamage();
+        int size = this.stackSize;
+        NBTTagCompound nbt = null;
+        if (this.getTagCompound() != null)
+        {
+            nbt = (NBTTagCompound) this.getTagCompound().copy();
+        }
+
+        if (!(this.getItem() instanceof ItemBucket)) // if not bucket
+        {
+            p_77943_2_.captureBlockStates = true;
+            if (this.getItem() instanceof ItemDye && this.getItemDamage() == 15)
+            {
+                Block block = p_77943_2_.getBlock(p_77943_3_, p_77943_4_, p_77943_5_);
+                if (block != null && (block instanceof BlockSapling || block instanceof BlockMushroom))
+                {
+                    p_77943_2_.captureTreeGeneration = true;
+                }
+            }
+        }
+        currentPlayer = p_77943_1_;
         boolean flag = this.getItem().onItemUse(this, p_77943_1_, p_77943_2_, p_77943_3_, p_77943_4_, p_77943_5_, p_77943_6_, p_77943_7_, p_77943_8_, p_77943_9_);
+        p_77943_2_.captureBlockStates = false;
+        currentPlayer = null;
+        if (flag && p_77943_2_.captureTreeGeneration && p_77943_2_.capturedBlockStates.size() > 0)
+        {
+            p_77943_2_.captureTreeGeneration = false;
+            Location location = new Location(p_77943_2_.getWorld(), p_77943_3_, p_77943_4_, p_77943_5_);
+            TreeType treeType = BlockSapling.treeType;
+            BlockSapling.treeType = null;
+            List<BlockState> blocks = (List<BlockState>) p_77943_2_.capturedBlockStates.clone();
+            p_77943_2_.capturedBlockStates.clear();
+            StructureGrowEvent event = null;
+            if (treeType != null)
+            {
+                event = new StructureGrowEvent(location, treeType, false, (Player) p_77943_1_.getBukkitEntity(), blocks);
+                org.bukkit.Bukkit.getPluginManager().callEvent(event);
+            }
+            if (event == null || !event.isCancelled())
+            {
+                for (BlockState blockstate : blocks)
+                {
+                    blockstate.update(true);
+                }
+            }
 
+            return flag;
+        }
+        p_77943_2_.captureTreeGeneration = false;
+
         if (flag)
         {
-            p_77943_1_.addStat(StatList.objectUseStats[Item.getIdFromItem(this.field_151002_e)], 1);
+            org.bukkit.event.block.BlockPlaceEvent placeEvent = null;
+            List<BlockState> blockstates = (List<BlockState>) p_77943_2_.capturedBlockStates.clone();
+            p_77943_2_.capturedBlockStates.clear();
+            if (blockstates.size() > 1)
+            {
+                placeEvent = org.bukkit.craftbukkit.event.CraftEventFactory.callBlockMultiPlaceEvent(p_77943_2_, p_77943_1_, blockstates, p_77943_3_,
+                        p_77943_4_, p_77943_5_);
+            }
+            else if (blockstates.size() == 1)
+            {
+                placeEvent = org.bukkit.craftbukkit.event.CraftEventFactory.callBlockPlaceEvent(p_77943_2_, p_77943_1_, blockstates.get(0), p_77943_3_,
+                        p_77943_4_, p_77943_5_);
+            }
+            if (placeEvent != null && (placeEvent.isCancelled() || !placeEvent.canBuild()))
+            {
+                flag = false; // cancel placement
+                // revert back all captured blocks
+                for (BlockState blockstate : blockstates)
+                {
+                    p_77943_2_.restoringBlockStates = true;
+                    blockstate.update(true, false); // restore blockstate
+                    p_77943_2_.restoringBlockStates = false;
+                }
+                // make sure to restore stack after cancel
+                this.setItemDamage(meta);
+                this.stackSize = size;
+                if (nbt != null)
+                {
+                    this.setTagCompound(nbt);
+                }
+            }
+            else
+            {
+                // drop items
+                for (int i = 0; i < p_77943_2_.capturedItems.size(); i++)
+                {
+                    p_77943_2_.spawnEntityInWorld(p_77943_2_.capturedItems.get(i));
+                }
+
+                for (BlockState blockstate : blockstates)
+                {
+                    int x = blockstate.getX();
+                    int y = blockstate.getY();
+                    int z = blockstate.getZ();
+                    int metadata = p_77943_2_.getBlockMetadata(x, y, z);
+                    int updateFlag = ((CraftBlockState) blockstate).getFlag();
+                    Block oldBlock = CraftMagicNumbers.getBlock(blockstate.getTypeId());
+                    Block newBlock = p_77943_2_.getBlock(x, y, z);
+                    if (newBlock != null && !(newBlock.hasTileEntity(metadata)))
+                    { // Containers get placed automatically
+                        newBlock.onBlockAdded(p_77943_2_, x, y, z);
+                    }
+
+                    p_77943_2_.markAndNotifyBlock(x, y, z, null, oldBlock, newBlock, updateFlag);
+                }
+                p_77943_1_.addStat(StatList.objectUseStats[Item.getIdFromItem(this.field_151002_e)], 1);
+            }
         }
+        p_77943_2_.capturedBlockStates.clear();
+        p_77943_2_.capturedItems.clear();
+        // Cauldron end
 
         return flag;
     }
@@ -227,8 +354,22 @@
         return getItem().getMaxDamage(this);
     }
 
+    // Spigot start
+
+    /**
+     * Attempts to damage the ItemStack with par1 amount of damage, If the ItemStack has the Unbreaking enchantment
+     * there is a chance for each point of damage to be negated. Returns true if it takes more damage than
+     * getMaxDamage(). Returns false otherwise or if the ItemStack can't be damaged or if all points of damage are
+     * negated.
+     */
     public boolean attemptDamageItem(int p_96631_1_, Random p_96631_2_)
     {
+        return isDamaged(p_96631_1_, p_96631_2_, null);
+    }
+
+    public boolean isDamaged(int p_96631_1_, Random p_96631_2_, EntityLivingBase entitylivingbase)
+    {
+        // Spigot end
         if (!this.isItemStackDamageable())
         {
             return false;
@@ -250,6 +391,23 @@
 
                 p_96631_1_ -= k;
 
+                // Spigot start
+                if (entitylivingbase instanceof EntityPlayerMP)
+                {
+                    org.bukkit.craftbukkit.inventory.CraftItemStack item = org.bukkit.craftbukkit.inventory.CraftItemStack.asCraftMirror(this);
+                    org.bukkit.event.player.PlayerItemDamageEvent event = new org.bukkit.event.player.PlayerItemDamageEvent(
+                            (org.bukkit.entity.Player) entitylivingbase.getBukkitEntity(), item, p_96631_1_);
+                    org.bukkit.Bukkit.getServer().getPluginManager().callEvent(event);
+
+                    if (event.isCancelled())
+                    {
+                        return false;
+                    }
+
+                    p_96631_1_ = event.getDamage();
+                }
+                // Spigot end
+
                 if (p_96631_1_ <= 0)
                 {
                     return false;
@@ -288,6 +446,12 @@
                         this.stackSize = 0;
                     }
 
+                    // CraftBukkit start - Check for item breaking
+                    if (this.stackSize == 0 && p_77972_2_ instanceof EntityPlayer)
+                    {
+                        org.bukkit.craftbukkit.event.CraftEventFactory.callPlayerItemBreakEvent((EntityPlayer) p_77972_2_, this);
+                    }
+                    // CraftBukkit end
                     this.itemDamage = 0;
                 }
             }
@@ -419,6 +583,7 @@
 
     public void setTagCompound(NBTTagCompound p_77982_1_)
     {
+        // Cauldron - do not alter name of compound. Fixes Ars Magica 2 Spellbooks
         this.stackTagCompound = p_77982_1_;
     }