CancelableEventBus.java

/*
 * Copyright (c) 2015 NOVA, All rights reserved.
 * This library is free software, licensed under GNU Lesser General Public License version 3
 *
 * This file is part of NOVA.
 *
 * NOVA is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * NOVA is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with NOVA.  If not, see <http://www.gnu.org/licenses/>.
 */

package nova.core.event.bus;

/**
 * Variant of {@link EventBus} which stops publishing events after they are
 * canceled.
 * @param <T> {@link CancelableEvent Cancelable} event type
 * @author Stan Hebben
 */
public class CancelableEventBus<T extends CancelableEvent> extends EventBus<T> {
	@Override
	public synchronized void publish(T event) {
		for (EventListenerNode node : getSortedListeners()) {
			node.getListener().onEvent(event);

			if (event.isCanceled()) {
				break;
			}
		}
	}
}