Entity AddTo/RemoveFrom World Events

These events will give plugins a reliable way to track every entity that is added
or removed from a world, so that one may always ensure they are in a desired state.

Spigot-API-Patches/0029-Entity-AddTo-RemoveFrom-World-Events.patch

@@ -0,0 +1,92 @@
+From 6fbe0184aa41dd325adc6415b01dda65b1b97c35 Mon Sep 17 00:00:00 2001
+From: Aikar <aikar@aikar.co>
+Date: Mon, 28 Mar 2016 20:26:34 -0400
+Subject: [PATCH] Entity AddTo/RemoveFrom World Events
+
+
+diff --git a/src/main/java/com/destroystokyo/paper/event/entity/EntityAddToWorldEvent.java b/src/main/java/com/destroystokyo/paper/event/entity/EntityAddToWorldEvent.java
+new file mode 100644
+index 0000000..cc44c1d
+--- /dev/null
++++ b/src/main/java/com/destroystokyo/paper/event/entity/EntityAddToWorldEvent.java
+@@ -0,0 +1,37 @@
++package com.destroystokyo.paper.event.entity;
++
++import org.bukkit.entity.Entity;
++import org.bukkit.event.Event;
++import org.bukkit.event.HandlerList;
++
++/**
++ * Fired any time an entity is being added to the world for any reason.
++ *
++ * Not to be confused with {@link org.bukkit.event.entity.CreatureSpawnEvent}
++ * This will fire anytime a chunk is reloaded too.
++ */
++public class EntityAddToWorldEvent extends Event {
++
++    private final Entity entity;
++    public EntityAddToWorldEvent(Entity entity) {
++        this.entity = entity;
++    }
++
++    /**
++     * Gets the entity being added to the world
++     * @return
++     */
++    public Entity getEntity() {
++        return entity;
++    }
++
++    private static final HandlerList handlers = new HandlerList();
++
++    public HandlerList getHandlers() {
++        return handlers;
++    }
++
++    public static HandlerList getHandlerList() {
++        return handlers;
++    }
++}
+diff --git a/src/main/java/com/destroystokyo/paper/event/entity/EntityRemoveFromWorldEvent.java b/src/main/java/com/destroystokyo/paper/event/entity/EntityRemoveFromWorldEvent.java
+new file mode 100644
+index 0000000..9b522ce
+--- /dev/null
++++ b/src/main/java/com/destroystokyo/paper/event/entity/EntityRemoveFromWorldEvent.java
+@@ -0,0 +1,34 @@
++package com.destroystokyo.paper.event.entity;
++
++import org.bukkit.entity.Entity;
++import org.bukkit.event.Event;
++import org.bukkit.event.HandlerList;
++
++/**
++ * Fired any time an entity is being removed from a world for any reason
++ */
++public class EntityRemoveFromWorldEvent extends Event {
++    private final Entity entity;
++
++    public EntityRemoveFromWorldEvent(Entity entity) {
++        this.entity = entity;
++    }
++
++    /**
++     * Gets the entity being removed from the world
++     * @return
++     */
++    public Entity getEntity() {
++        return entity;
++    }
++
++    private static final HandlerList handlers = new HandlerList();
++
++    public HandlerList getHandlers() {
++        return handlers;
++    }
++
++    public static HandlerList getHandlerList() {
++        return handlers;
++    }
++}
+-- 
+2.7.4
+

Spigot-Server-Patches/0115-Entity-AddTo-RemoveFrom-World-Events.patch

@@ -0,0 +1,29 @@
+From ba08cdb1b65264542221e56bf8178ec42ca2aeae Mon Sep 17 00:00:00 2001
+From: Aikar <aikar@aikar.co>
+Date: Mon, 28 Mar 2016 20:32:58 -0400
+Subject: [PATCH] Entity AddTo/RemoveFrom World Events
+
+
+diff --git a/src/main/java/net/minecraft/server/World.java b/src/main/java/net/minecraft/server/World.java
+index fcd7cd6..b1c78b5 100644
+--- a/src/main/java/net/minecraft/server/World.java
++++ b/src/main/java/net/minecraft/server/World.java
+@@ -1119,6 +1119,7 @@ public abstract class World implements IBlockAccess {
+         }
+ 
+         entity.valid = true; // CraftBukkit
++        new com.destroystokyo.paper.event.entity.EntityRemoveFromWorldEvent(entity.getBukkitEntity()); // Paper - fire while valid
+     }
+ 
+     protected void c(Entity entity) {
+@@ -1126,6 +1127,7 @@ public abstract class World implements IBlockAccess {
+             ((IWorldAccess) this.u.get(i)).b(entity);
+         }
+ 
++        new com.destroystokyo.paper.event.entity.EntityRemoveFromWorldEvent(entity.getBukkitEntity()); // Paper - fire while valid
+         entity.valid = false; // CraftBukkit
+     }
+ 
+-- 
+2.7.4
+