/* FeatureIDE - An IDE to support feature-oriented software development
 * Copyright (C) 2005-2009  FeatureIDE Team, University of Magdeburg
 *
 * This program 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 2 of the License, or
 * (at your option) any later version.
 *
 * This program 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 this program. If not, see http://www.gnu.org/licenses/.
 *
 * See http://www.fosd.de/featureide/ for further information.
 */
package featureide.fm.core;

import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.util.LinkedList;

/**
 * An instance of this class represents a connection between a feature and its
 * parent. It is necessary because every figure in GEF needs a associated model.
 * 
 * @author Thomas Thuem
 *
 */
public class FeatureConnection implements PropertyConstants {
	
	private Feature source;
	
	private Feature target;
	
	public FeatureConnection(Feature source) {
		this.source = source;
	}
	
	public Feature getSource() {
		return source;
	}
	
	public Feature getTarget() {
		return target;
	}
	
	public void setTarget(Feature target) {
		if (this.target == target)
			return;
		this.target = target;
		fireParentChanged();
	}

	private LinkedList<PropertyChangeListener> listenerList = new LinkedList<PropertyChangeListener>();
	
	public void addListener(PropertyChangeListener listener) {
		if (!listenerList.contains(listener))
			listenerList.add(listener);
	}
	
	public void removeListener(PropertyChangeListener listener) {
		listenerList.remove(listener);
	}
	
	private void fireParentChanged() {
		PropertyChangeEvent event = new PropertyChangeEvent(this, PARENT_CHANGED, false, true);
		for (PropertyChangeListener listener : listenerList)
			listener.propertyChange(event);
	}

}