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Wed Mar 24 16:00:00 GMT 2004
StateMemento
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; import ca.ubc.cs.spl.pattern.library.MementoException; import ca.ubc.cs.spl.pattern.library.MementoProtocol; /** * Implements an instance of the memento design pattern. * * @author Jan Hannemann * @author Gregor Kiczales * @version 1.0, 07/13/02 * * @see MyOriginator */ public aspect StateMemento extends MementoProtocol { /** * Assigns the <i>Originator</i> role to <code>MyOriginator</code> */ declare parents: MyOriginator implements Originator; /** * Creates a <i>Memento</i> object for an <i>Originator</i>. An anonymous * class is used to realize the Memento * * @param o the originator to create a memento for * @returns the memento storing the originator's state */ public Memento createMementoFor(Originator o) { if (o instanceof MyOriginator) { Memento m = new Memento() { private Integer state; public void setState(Object state) { this.state = (Integer) state; } public Object getState() { return state; } }; m.setState(new Integer(((MyOriginator)o).currentValue)); return m; } else { throw new MementoException("Invalid originator"); } } /** * Restores this originator to former state using the memento passed * * @param o the originator to restore * @param m the memento that stores the prior state */ public void setMemento(Originator o, Memento m) { if (o instanceof MyOriginator) { Integer integer = (Integer) m.getState(); ((MyOriginator)o).currentValue = integer.intValue(); } else { throw new MementoException("Invalid originator"); } } }
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