SPIGOT-4339: Add EntityTransformEvent

Thanks klugemonkey for some contributions in https://hub.spigotmc.org/stash/projects/SPIGOT/repos/bukkit/pull-requests/351/overview

nms-patches/EntityZombie.patch

@@ -1,20 +1,22 @@
 --- a/net/minecraft/server/EntityZombie.java
 +++ b/net/minecraft/server/EntityZombie.java
-@@ -6,6 +6,13 @@
+@@ -6,6 +6,15 @@
  import java.util.UUID;
  import javax.annotation.Nullable;
  
 +// CraftBukkit start
++import org.bukkit.craftbukkit.event.CraftEventFactory;
 +import org.bukkit.event.entity.CreatureSpawnEvent;
 +import org.bukkit.event.entity.EntityCombustByEntityEvent;
 +import org.bukkit.event.entity.EntityCombustEvent;
 +import org.bukkit.event.entity.EntityTargetEvent;
++import org.bukkit.event.entity.EntityTransformEvent;
 +// CraftBukkit end
 +
  public class EntityZombie extends EntityMonster {
  
      protected static final IAttribute c = (new AttributeRanged((IAttribute) null, "zombie.spawnReinforcements", 0.0D, 0.0D, 1.0D)).a("Spawn Reinforcements Chance");
-@@ -21,6 +28,7 @@
+@@ -21,6 +30,7 @@
      private int bJ;
      private float bK;
      private float bL;
@@ -22,7 +24,7 @@
  
      public EntityZombie(EntityTypes<?> entitytypes, World world) {
          super(entitytypes, world);
-@@ -143,8 +151,12 @@
+@@ -143,8 +153,12 @@
  
      public void tick() {
          if (!this.world.isClientSide) {
@@ -37,7 +39,7 @@
                  if (this.bJ < 0) {
                      this.dE();
                  }
-@@ -182,7 +194,14 @@
+@@ -182,7 +196,14 @@
              }
  
              if (flag) {
@@ -53,16 +55,21 @@
              }
          }
  
-@@ -221,7 +240,7 @@
+@@ -221,7 +242,12 @@
                  entityzombie.setCustomNameVisible(this.getCustomNameVisible());
              }
  
 -            this.world.addEntity(entityzombie);
++            // CraftBukkit start
++            if (CraftEventFactory.callEntityTransformEvent(this, entityzombie, EntityTransformEvent.TransformReason.DROWNED).isCancelled()) {
++                return;
++            }
++            // CraftBukkit end
 +            this.world.addEntity(entityzombie, CreatureSpawnEvent.SpawnReason.DROWNED); // CraftBukkit - added spawn reason
              this.die();
          }
      }
-@@ -252,8 +271,8 @@
+@@ -252,8 +278,8 @@
                      if (this.world.getType(new BlockPosition(i1, j1 - 1, k1)).q() && this.world.getLightLevel(new BlockPosition(i1, j1, k1)) < 10) {
                          entityzombie.setPosition((double) i1, (double) j1, (double) k1);
                          if (!this.world.isPlayerNearby((double) i1, (double) j1, (double) k1, 7.0D) && this.world.a_(entityzombie, entityzombie.getBoundingBox()) && this.world.getCubes(entityzombie, entityzombie.getBoundingBox()) && !this.world.containsLiquid(entityzombie.getBoundingBox())) {
@@ -73,7 +80,7 @@
                              entityzombie.prepare(this.world.getDamageScaler(new BlockPosition(entityzombie)), (GroupDataEntity) null, (NBTTagCompound) null);
                              this.getAttributeInstance(EntityZombie.c).b(new AttributeModifier("Zombie reinforcement caller charge", -0.05000000074505806D, 0));
                              entityzombie.getAttributeInstance(EntityZombie.c).b(new AttributeModifier("Zombie reinforcement callee charge", -0.05000000074505806D, 0));
-@@ -276,7 +295,14 @@
+@@ -276,7 +302,14 @@
              float f = this.world.getDamageScaler(new BlockPosition(this)).b();
  
              if (this.getItemInMainHand().isEmpty() && this.isBurning() && this.random.nextFloat() < f * 0.3F) {
@@ -89,16 +96,21 @@
              }
          }
  
-@@ -372,7 +398,7 @@
+@@ -372,7 +405,12 @@
                  entityzombievillager.setCustomNameVisible(entityvillager.getCustomNameVisible());
              }
  
 -            this.world.addEntity(entityzombievillager);
++            // CraftBukkit start
++            if (CraftEventFactory.callEntityTransformEvent(this, entityzombievillager, EntityTransformEvent.TransformReason.INFECTION).isCancelled()) {
++                return;
++            }
++            // CraftBukkit end
 +            this.world.addEntity(entityzombievillager, CreatureSpawnEvent.SpawnReason.INFECTION); // CraftBukkit - add SpawnReason
              this.world.a((EntityHuman) null, 1026, new BlockPosition(this), 0);
          }
  
-@@ -422,7 +448,7 @@
+@@ -422,7 +460,7 @@
                      entitychicken1.setPositionRotation(this.locX, this.locY, this.locZ, this.yaw, 0.0F);
                      entitychicken1.prepare(difficultydamagescaler, (GroupDataEntity) null, (NBTTagCompound) null);
                      entitychicken1.s(true);
@@ -107,7 +119,7 @@
                      this.startRiding(entitychicken1);
                  }
              }
-@@ -495,7 +521,7 @@
+@@ -495,7 +533,7 @@
      }
  
      public void die(DamageSource damagesource) {
@@ -116,7 +128,7 @@
          if (damagesource.getEntity() instanceof EntityCreeper) {
              EntityCreeper entitycreeper = (EntityCreeper) damagesource.getEntity();
  
-@@ -508,6 +534,7 @@
+@@ -508,6 +546,7 @@
                  }
              }
          }