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Wed Mar 24 16:00:00 GMT 2004
Main
package examples.memento.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.Memento; /** * Implements the driver for the memento design pattern example.<p> * * Intent: <i>Without violating encapsulation, capture and externalize an * object's internal state so that the object can be restored to this state * later</i><p> * * Participatng objects are <code>Memento</code> and <code>Originator</code> * <p> * * This example changes the state of the <i>Originator</i> five times, but * creates a <i>Memento</i> of it after the third change. After the 5 changes * are done, the <i>Memento</i> is used to restore the <i>Originator</i>'s * state. * * <p><i>This is the AspectJ version.</i><p> * * Memento and Originator are decoupled, but more types are needed than for * the specialized Java implementation. * * @author Jan Hannemann * @author Gregor Kiczales * @version 1.0, 07/13/02 * * @see StateMemento * @see MyOriginator */ public class Main { /** * This example changes the state of the <i>Originator</i> five times, but * creates a <i>Memento</i> of it after the third change. After the 5 changes * are done, the <i>Memento</i> is used to restore the <i>Originator</i>'s * state. */ public static void main(String[] args) { Memento storedState = null; MyOriginator counter = new MyOriginator(); for (int i=1; i<=5; i++) { counter.increment(); counter.show(); if (i==3) { storedState = StateMemento.aspectOf().createMementoFor(counter); } } System.out.println("\nTrying to reinstate state (3)..."); StateMemento.aspectOf().setMemento(counter, storedState); counter.show(); } }
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