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Wed Mar 24 16:00:00 GMT 2004
MediatorImplementation
package examples.mediator.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): */ import ca.ubc.cs.spl.pattern.library.MediatorProtocol; /** * Concretizes the mediation relationship for <code>Button</code> (colleague) * and <code>Label</code> (mediator). button clicks trigger updates. * * @author Jan Hannemann * @author Gregor Kiczales * @version 1.0, 05/13/02 */ public aspect MediatorImplementation extends MediatorProtocol { /** * Assings the <code>Colleague</code> role to the <code>Button</code> * class. Roles are modeled as (empty) interfaces. */ declare parents: Button implements Colleague; /** * Assings the <code>Colleague</code> role to the <code>Label</code> * class. Roles are modeled as (empty) interfaces. */ declare parents: Label implements Mediator; /** * Defines what changes on Colleagues cause their mediator to be notified * (here: Button clicks) * * @param cs the colleague on which the change occured */ protected pointcut change(Colleague c): (call(void Button.clicked()) && target(c)); /** * Defines how the <code>Mediator</code> is to be updated when a change * to a <code>Colleague</code> occurs. Here, the label's text is set * depending on which button was clicked. The appropriate button's label * is also updated. * * @param c the colleague on which a change of interest occured * @param m the mediator to be notifed of the change */ protected void notifyMediator(Colleague c, Mediator m) { Button button = (Button) c; Label label = (Label) m; if (button == Main.button1) { label.setText("Button1 clicked"); } else if (button == Main.button2) { label.setText("Button2 clicked"); } button.setText("(Done)"); } }
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