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Wed Mar 24 16:00:00 GMT 2004
Main
package examples.mediator.java; /* -*- 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): */ import javax.swing.*; import java.awt.event.*; /** * Implements the driver for the mediator design pattern example.<p> * * Intent: <i>Define an object that encapsulates how a set of objects * interact. Mediator promotes loose coupling by keeping objects from * referring to each other explicitly, and it lets you vary their interaction * independently.</i><p> * * Participatng objects are <code>Button</code>s as <i>Colleague</i>s, * and a <code>Label</code> as <i>Mediator</i>. * * Every time an event of interest (a button click) occurs, the mediating * <code>Label</code> is updated and it updates the calling button. * * <p><i>This is the Java version.</i><p> * * Both <i>Mediator</i> and <i>Colleagues</i> have to be aware of their role * within the pattern. * * @author Jan Hannemann * @author Gregor Kiczales * @version 1.0, 05/13/02 * * @see Button * @see Label */ public class Main { static JFrame frame = new JFrame("Mediator Demo"); static Button button1 = new Button("Button1"); static Button button2 = new Button("Button2"); static Label label = new Label ("Click a button!"); /** * Implements the driver for the mediator example. It creates a small * GUI with a label and two buttons. The buttons are <i>Colleague</i>s, * the label is the <i>Mediator</i>. * * Each button click causes the mediator to update itself and the * calling button. */ public static void main(String[] args) {; frame.addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent e) {System.exit(0);} }); JPanel panel = new JPanel(); panel.add(label); panel.add(button1); panel.add(button2); frame.getContentPane().add(panel); frame.pack(); frame.setVisible(true); button1.setMediator(label); button2.setMediator(label); } }
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