package jrummikub.util;

import java.util.HashSet;

/** Simple parameterless event generator */
public class Event implements IEvent {
	private HashSet<IListener> listeners = new HashSet<IListener>();

	@Override
	public Connection add(final IListener listener) {
		listeners.add(listener);
		return new Connection() {

			@Override
			public void remove() {
				Event.this.remove(listener);
			}
		};
	}

	@Override
	public void remove(IListener listener) {
		listeners.remove(listener);
	}

	/** Generate a single event */
	public void emit() {
		for (IListener listener : new HashSet<IListener>(listeners)) {
			listener.handle();
		}
	}
}