/*
 * %W% %E%
 *
 * Copyright 1997, 1998 Sun Microsystems, Inc. All Rights Reserved.
 * 
 * Redistribution and use in source and binary forms, with or
 * without modification, are permitted provided that the following
 * conditions are met:
 * 
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer. 
 *   
 * - Redistribution in binary form must reproduce the above
 *   copyright notice, this list of conditions and the following
 *   disclaimer in the documentation and/or other materials
 *   provided with the distribution. 
 *   
 * Neither the name of Sun Microsystems, Inc. or the names of
 * contributors may be used to endorse or promote products derived
 * from this software without specific prior written permission.  
 * 
 * This software is provided "AS IS," without a warranty of any
 * kind. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
 * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY
 * EXCLUDED. SUN AND ITS LICENSORS SHALL NOT BE LIABLE FOR ANY
 * DAMAGES OR LIABILITIES SUFFERED BY LICENSEE AS A RESULT OF OR
 * RELATING TO USE, MODIFICATION OR DISTRIBUTION OF THIS SOFTWARE OR
 * ITS DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS BE LIABLE 
 * FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT,   
 * SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER  
 * CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF 
 * THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF SUN HAS 
 * BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
 * 
 * You acknowledge that this software is not designed, licensed or
 * intended for use in the design, construction, operation or
 * maintenance of any nuclear facility.
 */

package org.mindswap.swoop.treetable;

import java.util.EventObject;

import javax.swing.CellEditor;
import javax.swing.event.CellEditorListener;
import javax.swing.event.ChangeEvent;
import javax.swing.event.EventListenerList;

/**
 * @version %I% %G% 
 * 
 * A base class for CellEditors, providing default implementations for all 
 * methods in the CellEditor interface and support for managing a series 
 * of listeners. 
 *
 * @author Philip Milne
 */

public class AbstractCellEditor implements CellEditor {

	protected EventListenerList listenerList = new EventListenerList();

	public Object getCellEditorValue() {
		return null;
	}

	public boolean isCellEditable(EventObject e) {
		return true;
	}

	public boolean shouldSelectCell(EventObject anEvent) {
		return false;
	}

	public boolean stopCellEditing() {
		return true;
	}

	public void cancelCellEditing() {
	}

	public void addCellEditorListener(CellEditorListener l) {
		listenerList.add(CellEditorListener.class, l);
	}

	public void removeCellEditorListener(CellEditorListener l) {
		listenerList.remove(CellEditorListener.class, l);
	}

	/**
	 * Notify all listeners that have registered interest for
	 * notification on this event type.  
	 * @see EventListenerList
	 */
	protected void fireEditingStopped() {
		// Guaranteed to return a non-null array
		Object[] listeners = listenerList.getListenerList();
		// Process the listeners last to first, notifying
		// those that are interested in this event
		for (int i = listeners.length - 2; i >= 0; i -= 2) {
			if (listeners[i] == CellEditorListener.class) {
				((CellEditorListener) listeners[i + 1])
						.editingStopped(new ChangeEvent(this));
			}
		}
	}

	/**
	 * Notify all listeners that have registered interest for
	 * notification on this event type.  
	 * @see EventListenerList
	 */
	protected void fireEditingCanceled() {
		// Guaranteed to return a non-null array
		Object[] listeners = listenerList.getListenerList();
		// Process the listeners last to first, notifying
		// those that are interested in this event
		for (int i = listeners.length - 2; i >= 0; i -= 2) {
			if (listeners[i] == CellEditorListener.class) {
				((CellEditorListener) listeners[i + 1])
						.editingCanceled(new ChangeEvent(this));
			}
		}
	}
}