CatServer/patches/net/minecraft/entity/boss/dragon/phase/PhaseManager.java.patch

--- ../src-base/minecraft/net/minecraft/entity/boss/dragon/phase/PhaseManager.java
+++ ../src-work/minecraft/net/minecraft/entity/boss/dragon/phase/PhaseManager.java
@@ -3,6 +3,8 @@
 import net.minecraft.entity.boss.EntityDragon;
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
+import org.bukkit.craftbukkit.entity.CraftEnderDragon;
+import org.bukkit.event.entity.EnderDragonChangePhaseEvent;
 
 public class PhaseManager
 {
@@ -26,8 +28,20 @@
                 this.phase.removeAreaEffect();
             }
 
-            this.phase = this.getPhase(phaseIn);
+            // CraftBukkit start - Call EnderDragonChangePhaseEvent
+            EnderDragonChangePhaseEvent event = new EnderDragonChangePhaseEvent(
+                    (CraftEnderDragon) this.dragon.getBukkitEntity(),
+                    (this.phase == null) ? null : CraftEnderDragon.getBukkitPhase(this.phase.getPhaseList()),
+                    CraftEnderDragon.getBukkitPhase(phaseIn)
+            );
+            this.dragon.worldObj.getServer().getPluginManager().callEvent(event);
+            if (event.isCancelled()) {
+                return;
+            }
+            phaseIn = CraftEnderDragon.getMinecraftPhase(event.getNewPhase());
+            // CraftBukkit end
 
+            this.phase = this.getPhase(phaseIn);
             if (!this.dragon.worldObj.isRemote)
             {
                 this.dragon.getDataManager().set(EntityDragon.PHASE, Integer.valueOf(phaseIn.getId()));