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Wed Mar 24 16:00:00 GMT 2004
Main
package examples.chainOfResponsibility.aspectj; /* -*- Mode: Java; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- * * This file is part of the design patterns project at UBC * * The contents of this file are subject to the Mozilla Public License * Version 1.1 (the "License"); you may not use this file except in * compliance with the License. You may obtain a copy of the License at * either http://www.mozilla.org/MPL/ or http://aspectj.org/MPL/. * * Software distributed under the License is distributed on an "AS IS" basis, * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License * for the specific language governing rights and limitations under the * License. * * The Original Code is ca.ubc.cs.spl.patterns. * * Contributor(s): */ /** * Implements a GUI-motivated example for the Chain Of Rspsonsibility design * pattern.<p> * * Intent: <i>Avoid coupling the sender of a request to its receiver by giving * more than one object a chance to handle the request. Chain the receiving * objects and pass the request along the chain until an object handles it. * </i><p> * * Participatng objects are a <code>Frame</code>, a <code>Panel</code>, and * <code>Button</code> * * A click on the button triggers an event (request) that gets passed along * the widget hierarchy (button -> panel -> frame). * * The <code>Handler</code> interface defines the <code>handleRequest()</code> * method for asking an object if it is willing to handle the request. * * <p><i>This is the AspectJ version.</i><p> * * In this implementation, the request is handled by the panel if the * CTRL mask is active (i.e., if the CTRL key was pressed while the button * was clicked). If the SHIFT mask is active, the frame handles the request. * Otherwise, the request is unhandled. * * @author Jan Hannemann * @author Gregor Kiczales * @version 1.0, 06/13/02 * * @see Button * @see Panel * @see Frame * @see MyChain */ public class Main { /** * Implements a GUI-motivated example for the Chain Of Rspsonsibility design * pattern.<p> * * In this implementation, the request is handled by the panel if the * CTRL mask is active (i.e., if the CTRL key was pressed while the button * was clicked). If the SHIFT mask is active, the frame handles the request. * Otherwise, the request is unhandled. * * @param args command line parameters, unused */ public static void main(String[] args) { Frame frame = new Frame("Chain of Responsibility"); Panel panel = new Panel(); Button button = new Button("Click me to see the Chain Of Responsibility pattern in action! Use <SHIFT> and <CTRL> during clicks to see different behavior"); MyChain.aspectOf().setSuccessor(button, panel); MyChain.aspectOf().setSuccessor(panel, frame); MyChain.aspectOf().setNotification(true); frame.getContentPane().add(panel); panel.add(button); frame.pack(); frame.setVisible(true); } }
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