@Override
		public void beginContact(Contact contact) {
			Entity entityA = (Entity) contact.getFixtureA().getBody().getUserData();
			Entity entityB = (Entity) contact.getFixtureB().getBody().getUserData();
			
			CollisionEvent collision = new CollisionEvent(entityA.getId(), entityB.getId());
			entityA.handleEvent(collision);
			entityB.handleEvent(collision);
		}