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Wed Mar 24 16:00:00 GMT 2004
MementoProtocol
package ca.ubc.cs.spl.pattern.library; /* -*- 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): */ /** * Implements the abstract memento design pattern. It defines the role of * <i>Originator</i>. The <i>Memento</i> role is client-usable and as such * defines outside this aspect. * * Concrete sub-aspects overwrite the two abstract methods to define how * <i>Memento</i>s get generated and how they are used to restore the state * of <i>Originator</i>s. * * @author Jan Hannemann * @author Gregor Kiczales * @version 1.0, 07/13/02 * */ public abstract aspect MementoProtocol { /** * Defines the <i>Originator</i> type. Used only by pattern code */ protected interface Originator {} /** * Creates a <i>Memento</i> object for an <i>Originator</i> * * @param o the originator to create a memento for * @returns the memento storing the originator's state */ public abstract Memento createMementoFor(Originator o); /** * 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 abstract void setMemento(Originator o, Memento m); }
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