package dev.kske.chess.event;

import java.util.ArrayList;
import java.util.List;

/**
 * Project: <strong>Chess</strong><br>
 * File: <strong>EventBus.java</strong><br>
 * Created: <strong>7 Aug 2019</strong><br>
 * Author: <strong>Kai S. K. Engelbart</strong>
 */
public class EventBus {

	private List<Subscribable> subscribers;

	private static EventBus instance;

	public static EventBus getInstance() {
		if (instance == null) instance = new EventBus();
		return instance;
	}

	private EventBus() {
		subscribers = new ArrayList<>();
	}

	public void register(Subscribable subscribable) {
		subscribers.add(subscribable);
	}

	public void dispatch(Event<?> event) {
		subscribers.stream().filter(e -> e.supports().contains(event.getClass())).forEach(e -> e.handle(event));
	}

	public List<Subscribable> getSubscribers() { return subscribers; }
}