My contact listener implementation

ContactListenerImpl.java

package ch.digitalmeat.meatpong;

import ch.digitalmeat.meatpong.event.Events;
import ch.digitalmeat.meatpong.event.NotificationType;
import ch.digitalmeat.meatpong.game.Entity;
import ch.digitalmeat.meatpong.game.EntityType;

import com.badlogic.gdx.physics.box2d.Body;
import com.badlogic.gdx.physics.box2d.Contact;
import com.badlogic.gdx.physics.box2d.ContactImpulse;
import com.badlogic.gdx.physics.box2d.ContactListener;
import com.badlogic.gdx.physics.box2d.Manifold;

public class ContactListenerImpl implements ContactListener {
	private final Events events;

	public ContactListenerImpl(Events events) {
		this.events = events;
	}

	@Override
	public void beginContact(Contact contact) {
		Body a = contact.getFixtureA().getBody();
		Body b = contact.getFixtureB().getBody();

		if (!handleBeginContact(contact, a, b)) {
			handleBeginContact(contact, b, a);
		}
	}

	private boolean handleBeginContact(Contact contact, Body a, Body b) {
		if (isOfType(a, EntityType.Destructor) && isOfType(b, EntityType.Ball)) {
			events.destroyed(b, a);
			events.notification(NotificationType.BallLost);
			return true;
		} else if (isOfType(a, EntityType.Paddle) && isOfType(b, EntityType.Ball)) {
			events.paddleHit(a, b);
			events.notification(NotificationType.PaddleHit);
			return true;
		} else if (isOfType(a, EntityType.Wall) && isOfType(b, EntityType.Ball)) {
			events.notification(NotificationType.WallHit);
			return true;
		} else if (isOfType(a, EntityType.Enemy) && isOfType(b, EntityType.Ball)) {
			events.enemyHit(a, b);
			events.notification(NotificationType.EnemyHit);
			return true;
		}

		return false;
	}

	public boolean isOfType(Body body, EntityType type) {
		Object userData = body.getUserData();
		if (userData instanceof EntityType) {
			EntityType bodyType = (EntityType) userData;
			return bodyType.equals(type);

		} else if (userData instanceof Entity) {
			Entity entity = (Entity) userData;
			return entity.type.equals(type);
		}
		return false;
	}

	@Override
	public void endContact(Contact contact) {

	}

	@Override
	public void preSolve(Contact contact, Manifold oldManifold) {

	}

	@Override
	public void postSolve(Contact contact, ContactImpulse impulse) {

	}

}