Added EntityTargetEvent for Experience Orbs, happens when it starts moving towards a human entity! Addresses BUKKIT-820

src/main/java/net/minecraft/server/EntityExperienceOrb.java

@@ -56,18 +56,24 @@ public class EntityExperienceOrb extends Entity {
         EntityHuman entityhuman = this.world.findNearbyPlayer(this, d0);
 
         if (entityhuman != null) {
-            double d1 = (entityhuman.locX - this.locX) / d0;
-            double d2 = (entityhuman.locY + (double) entityhuman.y() - this.locY) / d0;
-            double d3 = (entityhuman.locZ - this.locZ) / d0;
+            // CraftBukkit start
+            org.bukkit.event.entity.EntityTargetEvent event = CraftEventFactory.callEntityTargetEvent(this, entityhuman, org.bukkit.event.entity.EntityTargetEvent.TargetReason.CLOSEST_PLAYER);
+            Entity target = event.getTarget() == null ? null : ((org.bukkit.craftbukkit.entity.CraftEntity) event.getTarget()).getHandle();
+
+            if (!event.isCancelled() && target != null) {
+                double d1 = (target.locX - this.locX) / d0;
+                double d2 = (target.locY + (double) target.y() - this.locY) / d0;
+                double d3 = (target.locZ - this.locZ) / d0;
                 double d4 = Math.sqrt(d1 * d1 + d2 * d2 + d3 * d3);
                 double d5 = 1.0D - d4;
-
                 if (d5 > 0.0D) {
                     d5 *= d5;
                     this.motX += d1 / d4 * d5 * 0.1D;
                     this.motY += d2 / d4 * d5 * 0.1D;
                     this.motZ += d3 / d4 * d5 * 0.1D;
                 }
+                // CraftBukkit end
+            }
         }
 
         this.move(this.motX, this.motY, this.motZ);

src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java

@@ -407,4 +407,10 @@ public class CraftEventFactory {
         creeper.getBukkitEntity().getServer().getPluginManager().callEvent(event);
         return event;
     }
+
+    public static EntityTargetEvent callEntityTargetEvent(Entity entity, Entity target, EntityTargetEvent.TargetReason reason) {
+        EntityTargetEvent event = new EntityTargetEvent(entity.getBukkitEntity(), target.getBukkitEntity(), reason);
+        entity.getBukkitEntity().getServer().getPluginManager().callEvent(event);
+        return event;
+    }
 }