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

--- ../src-base/minecraft/net/minecraft/item/ItemStack.java
+++ ../src-work/minecraft/net/minecraft/item/ItemStack.java
@@ -2,14 +2,18 @@
 
 import com.google.common.collect.HashMultimap;
 import com.google.common.collect.Multimap;
+
+import cpw.mods.fml.common.FMLLog;
 import cpw.mods.fml.relauncher.Side;
 import cpw.mods.fml.relauncher.SideOnly;
+
 import java.text.DecimalFormat;
 import java.util.ArrayList;
 import java.util.Iterator;
 import java.util.List;
 import java.util.Random;
 import java.util.Map.Entry;
+
 import net.minecraft.block.Block;
 import net.minecraft.enchantment.Enchantment;
 import net.minecraft.enchantment.EnchantmentDurability;
@@ -35,6 +39,21 @@
 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 +62,12 @@
     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 +150,14 @@
     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_);
-        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_);
 
+        // Cauldron start - handle all placement events here
+        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_);
         if (flag)
         {
             p_77943_1_.addStat(StatList.objectUseStats[Item.getIdFromItem(this.field_151002_e)], 1);
         }
+        // Cauldron end
 
         return flag;
     }
@@ -227,8 +253,22 @@
         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 +290,23 @@
 
                 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;
@@ -267,7 +324,7 @@
         {
             if (this.isItemStackDamageable())
             {
-                if (this.attemptDamageItem(p_77972_1_, p_77972_2_.getRNG()))
+                if (this.isDamaged(p_77972_1_, p_77972_2_.getRNG(), p_77972_2_))
                 {
                     p_77972_2_.renderBrokenItemStack(this);
                     --this.stackSize;
@@ -288,6 +345,12 @@
                         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 +482,7 @@
 
     public void setTagCompound(NBTTagCompound p_77982_1_)
     {
+        // Cauldron - do not alter name of compound. Fixes Ars Magica 2 Spellbooks
         this.stackTagCompound = p_77982_1_;
     }
 
@@ -768,4 +832,12 @@
 
         return ichatcomponent;
     }
+    
+    // Spigot start
+    public static boolean fastMatches(ItemStack is1, ItemStack is2) {
+    	if (is1 == null && is2 == null) return true;
+    	if (is1 != null && is2 != null) return is1.stackSize == is2.stackSize && is1.field_151002_e == is2.field_151002_e && is1.itemDamage == is2.itemDamage;
+    	return false;
+    }
+    // Spigot end
 }