CatServer/patches/net/minecraft/entity/boss/EntityDragon.java.patch

--- ../src-base/minecraft/net/minecraft/entity/boss/EntityDragon.java
+++ ../src-work/minecraft/net/minecraft/entity/boss/EntityDragon.java
@@ -17,12 +17,14 @@
 import net.minecraft.entity.item.EntityXPOrb;
 import net.minecraft.entity.monster.IMob;
 import net.minecraft.entity.player.EntityPlayer;
+import net.minecraft.entity.player.EntityPlayerMP;
 import net.minecraft.init.Blocks;
 import net.minecraft.init.SoundEvents;
 import net.minecraft.nbt.NBTTagCompound;
 import net.minecraft.network.datasync.DataParameter;
 import net.minecraft.network.datasync.DataSerializers;
 import net.minecraft.network.datasync.EntityDataManager;
+import net.minecraft.network.play.server.SPacketEffect;
 import net.minecraft.pathfinding.Path;
 import net.minecraft.pathfinding.PathHeap;
 import net.minecraft.pathfinding.PathPoint;
@@ -37,6 +39,7 @@
 import net.minecraft.util.math.BlockPos;
 import net.minecraft.util.math.MathHelper;
 import net.minecraft.util.math.Vec3d;
+import net.minecraft.world.Explosion;
 import net.minecraft.world.World;
 import net.minecraft.world.WorldProviderEnd;
 import net.minecraft.world.end.DragonFightManager;
@@ -45,6 +48,8 @@
 import net.minecraftforge.fml.relauncher.SideOnly;
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
+import org.bukkit.event.entity.EntityExplodeEvent;
+import org.bukkit.event.entity.EntityRegainHealthEvent;
 
 public class EntityDragon extends EntityLiving implements IEntityMultiPart, IMob
 {
@@ -73,6 +78,7 @@
     private final PathPoint[] pathPoints = new PathPoint[24];
     private final int[] neighbors = new int[24];
     private final PathHeap pathFindQueue = new PathHeap();
+    private Explosion explosionSource = new Explosion(null, this, Double.NaN, Double.NaN, Double.NaN, Float.NaN, true, true); // CraftBukkit - reusable source for CraftTNTPrimed.getSource()
 
     public EntityDragon(World worldIn)
     {
@@ -393,7 +399,14 @@
             }
             else if (this.ticksExisted % 10 == 0 && this.getHealth() < this.getMaxHealth())
             {
-                this.setHealth(this.getHealth() + 1.0F);
+                // CraftBukkit start
+                EntityRegainHealthEvent event = new EntityRegainHealthEvent(this.getBukkitEntity(), 1.0F, EntityRegainHealthEvent.RegainReason.ENDER_CRYSTAL);
+                this.worldObj.getServer().getPluginManager().callEvent(event);
+
+                if (!event.isCancelled()) {
+                    this.setHealth((float) (this.getHealth() + event.getAmount()));
+                }
+                // CraftBukkit end
             }
         }
 
@@ -470,6 +483,10 @@
         int j1 = MathHelper.floor_double(p_70972_1_.maxZ);
         boolean flag = false;
         boolean flag1 = false;
+        // CraftBukkit start - Create a list to hold all the destroyed blocks
+        List<org.bukkit.block.Block> destroyedBlocks = new java.util.ArrayList<org.bukkit.block.Block>();
+        org.bukkit.craftbukkit.CraftWorld craftWorld = this.worldObj.getWorld();
+        // CraftBukkit end
 
         for (int k1 = i; k1 <= l; ++k1)
         {
@@ -491,7 +508,10 @@
                         {
                             if (block != Blocks.COMMAND_BLOCK && block != Blocks.REPEATING_COMMAND_BLOCK && block != Blocks.CHAIN_COMMAND_BLOCK && block != Blocks.IRON_BARS && block != Blocks.END_GATEWAY)
                             {
-                                flag1 = this.worldObj.setBlockToAir(blockpos) || flag1;
+                                // CraftBukkit start - Add blocks to list rather than destroying them
+                                flag1 = true;
+                                destroyedBlocks.add(craftWorld.getBlockAt(k1, l1, i2));
+                                // CraftBukkit end
                             }
                             else
                             {
@@ -507,6 +527,41 @@
             }
         }
 
+        // CraftBukkit start - Set off an EntityExplodeEvent for the dragon exploding all these blocks
+        org.bukkit.entity.Entity bukkitEntity = this.getBukkitEntity();
+        EntityExplodeEvent event = new EntityExplodeEvent(bukkitEntity, bukkitEntity.getLocation(), destroyedBlocks, 0F);
+        bukkitEntity.getServer().getPluginManager().callEvent(event);
+        if (event.isCancelled()) {
+            // This flag literally means 'Dragon hit something hard' (Obsidian, White Stone or Bedrock) and will cause the dragon to slow down.
+            // We should consider adding an event extension for it, or perhaps returning true if the event is cancelled.
+            return flag;
+        } else if (event.getYield() == 0F) {
+            // Yield zero ==> no drops
+            for (org.bukkit.block.Block block : event.blockList()) {
+                this.worldObj.setBlockToAir(new BlockPos(block.getX(), block.getY(), block.getZ()));
+            }
+        } else {
+            for (org.bukkit.block.Block block : event.blockList()) {
+                org.bukkit.Material blockId = block.getType();
+                if (blockId == org.bukkit.Material.AIR) {
+                    continue;
+                }
+
+                int blockX = block.getX();
+                int blockY = block.getY();
+                int blockZ = block.getZ();
+
+                Block nmsBlock = org.bukkit.craftbukkit.util.CraftMagicNumbers.getBlock(blockId);
+                if (nmsBlock.canDropFromExplosion(explosionSource)) {
+                    nmsBlock.dropBlockAsItemWithChance(this.worldObj, new BlockPos(blockX, blockY, blockZ), nmsBlock.getStateFromMeta(block.getData()), event.getYield(), 0);
+                }
+                nmsBlock.onBlockDestroyedByExplosion(worldObj, new BlockPos(blockX, blockY, blockZ), explosionSource);
+
+                this.worldObj.setBlockToAir(new BlockPos(blockX, blockY, blockZ));
+            }
+        }
+        // CraftBukkit end
+
         if (flag1)
         {
             double d0 = p_70972_1_.minX + (p_70972_1_.maxX - p_70972_1_.minX) * (double)this.rand.nextFloat();
@@ -620,7 +675,23 @@
 
             if (this.deathTicks == 1)
             {
-                this.worldObj.playBroadcastSound(1028, new BlockPos(this), 0);
+                // CraftBukkit start - Use relative location for far away sounds
+                int viewDistance = this.worldObj.getServer().getViewDistance() * 16;
+                for (EntityPlayerMP player : this.worldObj.getMinecraftServer().getPlayerList().playerEntityList) {
+                    double deltaX = this.posX - player.posX;
+                    double deltaZ = this.posZ - player.posZ;
+                    double distanceSquared = deltaX * deltaX + deltaZ * deltaZ;
+                    if (worldObj.spigotConfig.dragonDeathSoundRadius > 0 && distanceSquared > worldObj.spigotConfig.dragonDeathSoundRadius * worldObj.spigotConfig.dragonDeathSoundRadius) continue; // Spigot
+                    if (distanceSquared > viewDistance * viewDistance) {
+                        double deltaLength = Math.sqrt(distanceSquared);
+                        double relativeX = player.posX + (deltaX / deltaLength) * viewDistance;
+                        double relativeZ = player.posZ + (deltaZ / deltaLength) * viewDistance;
+                        player.connection.sendPacket(new SPacketEffect(1028, new BlockPos((int) relativeX, (int) this.posY, (int) relativeZ), 0, true));
+                    } else {
+                        player.connection.sendPacket(new SPacketEffect(1028, new BlockPos((int) this.posX, (int) this.posY, (int) this.posZ), 0, true));
+                    }
+                }
+                // CraftBukkit end
             }
         }