/*
 * GNU LESSER GENERAL PUBLIC LICENSE Copyright (C) 2006 The Lobo Project
 * 
 * This library is free software; you can redistribute it and/or modify it under
 * the terms of the GNU Lesser General Public License as published by the Free
 * Software Foundation; either version 2.1 of the License, or (at your option)
 * any later version.
 * 
 * This library 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 Lesser General Public License for more
 * details.
 * 
 * You should have received a copy of the GNU Lesser General Public License
 * along with this library; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 * 
 * Contact info: lobochief@users.sourceforge.net
 */
/*
 * Created on Mar 19, 2005
 */
package com.nvarghese.beowulf.common.cobra.util;

import java.util.Collection;
import java.util.EventObject;
import java.util.LinkedList;

/**
 * @author J. H. S.
 */
public class EventDispatch {

	private Collection listeners;

	public EventDispatch() {

	}

	public Collection createListenerCollection() {

		return new LinkedList();
	}

	public final void addListener(GenericEventListener listener) {

		synchronized (this) {
			if (this.listeners == null) {
				this.listeners = this.createListenerCollection();
			}
			this.listeners.add(listener);
		}
	}

	public final void removeListener(GenericEventListener listener) {

		synchronized (this) {
			if (this.listeners != null) {
				this.listeners.remove(listener);
			}
		}
	}

	public final void fireEvent(EventObject event) {

		GenericEventListener[] larray = null;
		synchronized (this) {
			if (this.listeners != null) {
				larray = (GenericEventListener[]) this.listeners.toArray(GenericEventListener.EMPTY_ARRAY);
			}
		}
		if (larray != null) {
			for (int i = 0; i < larray.length; i++) {
				// Call holding no locks
				larray[i].processEvent(event);
			}
		}
	}
}