/* * Copyright 1999-2005 The Apache Software Foundation. *  * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at *  *      http://www.apache.org/licenses/LICENSE-2.0 *  * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */package org.apache.log4j.chainsaw;import java.awt.event.ActionEvent;import javax.swing.AbstractAction;import org.apache.log4j.Logger;/** * Encapsulates the action to exit. * * @author <a href="mailto:oliver@puppycrawl.com">Oliver Burn</a> * @version 1.0 */class ExitAction    extends AbstractAction{    /** use to log messages **/    private static final Logger LOG = Logger.getLogger(ExitAction.class);    /** The instance to share **/    public static final ExitAction INSTANCE = new ExitAction();    /** Stop people creating instances **/    private ExitAction() {}    /**     * Will shutdown the application.     * @param aIgnore ignored     */    public void actionPerformed(ActionEvent aIgnore) {        LOG.info("shutting down");        System.exit(0);    }}