Added EntityTeleportEvent. Fixes BUKKIT-366

By: craftycreeper <diagonalfish+craftycreeper@gmail.com>

paper-api/src/main/java/org/bukkit/event/Event.java

@@ -825,6 +825,12 @@ public abstract class Event implements Serializable {
          * @see org.bukkit.event.entity.EndermanPlaceEvent
          */
         ENDERMAN_PLACE(Category.LIVING_ENTITY, EndermanPlaceEvent.class),
+        /**
+         * Called when a non-player LivingEntity teleports
+         *
+         * @see org.bukkit.event.entity.EntityTeleportEvent
+         */
+        ENTITY_TELEPORT(Category.LIVING_ENTITY, EntityTeleportEvent.class),
         /**
          * Called when a human entity's food level changes
          *

paper-api/src/main/java/org/bukkit/event/entity/EntityTeleportEvent.java

@@ -0,0 +1,79 @@
+package org.bukkit.event.entity;
+
+import org.bukkit.Location;
+import org.bukkit.entity.Entity;
+import org.bukkit.event.Cancellable;
+import org.bukkit.event.HandlerList;
+
+/**
+ * Thrown when a non-player entity (such as an Enderman) tries to teleport from one
+ * location to another.
+ */
+@SuppressWarnings("serial")
+public class EntityTeleportEvent extends EntityEvent implements Cancellable {
+    private static final HandlerList handlers = new HandlerList();
+
+    private boolean cancel;
+    private Location from;
+    private Location to;
+
+    public EntityTeleportEvent(Entity what, Location from, Location to) {
+        super(Type.ENTITY_TELEPORT, what);
+        this.from = from;
+        this.to = to;
+        this.cancel = false;
+    }
+
+    public boolean isCancelled() {
+        return cancel;
+    }
+
+    public void setCancelled(boolean cancel) {
+        this.cancel = cancel;
+    }
+
+    /**
+     * Gets the location that this entity moved from
+     *
+     * @return Location this entity moved from
+     */
+    public Location getFrom() {
+        return from;
+    }
+
+    /**
+     * Sets the location that this entity moved from
+     *
+     * @param from New location this entity moved from
+     */
+    public void setFrom(Location from) {
+        this.from = from;
+    }
+
+    /**
+     * Gets the location that this entity moved to
+     *
+     * @return Location the entity moved to
+     */
+    public Location getTo() {
+        return to;
+    }
+
+    /**
+     * Sets the location that this entity moved to
+     *
+     * @param to New Location this entity moved to
+     */
+    public void setTo(Location to) {
+        this.to = to;
+    }
+
+    @Override
+    public HandlerList getHandlers() {
+        return handlers;
+    }
+
+    public static HandlerList getHandlerList() {
+        return handlers;
+    }
+}