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Wed Mar 24 16:00:00 GMT 2004
Main
package examples.prototype.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.pattern. * * Contributor(s): */ /** * Implements the driver for the Prototype design pattern example.<p> * * Intent: <i>Specify the kinds of objects to create using a prototypical * instance, and create new objects by copying this prototype.</i><p> * * Participatng objects are <code>MyString</code> and * <code>AnotherString</code> as <i>Prototype</i>s.<p> * * In this example, both MyString and AnotherString implement cloneable * classes emulating limited String behavior. This driver creates an * object of each class and clones it. Both originals and clones are * manipulated to show that they are different objects. * * <p><i>This is the AspectJ version.</i><p> * * Java's <code>Cloneable</code> interface is used internally. In this * version, a standard implementation for <code>createClone()</code> is * provided by the abstract pattern aspect. Each concrete pattern instance * aspect can define special behavior by overwriting the appropriate * methods. Consequently, the participants are freed of the pattern. * * @author Jan Hannemann * @author Gregor Kiczales * @version 1.0, 05/13/02 * * @see MyString * @see AnotherString */ public class Main { /** * Implements the driver for the Prototype design pattern example.<p> * * In this example, both MyString and AnotherString implement cloneable * classes emulating limited String behavior. This driver creates an * object of each class and clones it. Both originals and clones are * manipulated to show that they are different objects. * * @param args the command line parameters, unused. */ public static void main(String[] args) { System.out.println("Testing the Prototype design pattern implementation..."); MyString orig1; AnotherString orig2; MyString copy1, copy3; AnotherString copy2; orig1 = new MyString(" This is Prototype 1"); orig2 = new AnotherString(" This is Prototype 2"); System.out.println("These are the two prototypes:"); System.out.println(orig1); System.out.println(orig2); copy1 = (MyString) StringPrototypes.aspectOf().cloneObject(orig1); copy2 = (AnotherString) StringPrototypes.aspectOf().cloneObject(orig2); System.out.println("These are copies of the prototypes:"); System.out.println(copy1); System.out.println(copy2); orig1.setText(" This is Prototype 3"); System.out.println("Now prototype 1 was changed. Here are p1 and its former copy:"); System.out.println(orig1); System.out.println(copy1); copy3 = (MyString) StringPrototypes.aspectOf().cloneObject(orig1); copy2.setText(" This is Clone 2"); System.out.println("This is a clone of the changed p1 and a changed copy2:"); System.out.println(copy3); System.out.println(copy2); System.out.println("... done."); } }
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