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Wed Mar 24 16:00:00 GMT 2004
PrototypeProtocol
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.pattern. * * Contributor(s): */ /** * Implements the abstract Prototype design pattern. It attaches a default * <code>clone()</code> method on all <i>Prototype</i> participants and * provides a static <code>cloneObject(Prototype)</clone> method. The default * implementation of that method is to try to use the <code>clone()</code> * method and, failing that, to call its protected <code> * createCloneFor(Prototype)</code> method. Concrete subaspects can either * overwrite none or one (or both) of the methods to create individual * results * * @author Jan Hannemann * @author Gregor Kiczales * @version 1.0, 05/13/02 */ public abstract aspect PrototypeProtocol { /** * Defines the <i>Prototype</i> role. */ protected interface Prototype {} /** * Attaches a default <code>clone()</code> method to all prototypes. * This makes use of Java's clone() mechanism that creates a deep copy * of the object in question. * * @returns a copy of the object */ public Object Prototype.clone() throws CloneNotSupportedException { return super.clone(); } /** * Provides a static default method for cloning prototypes. * It uses the attached clone() method if possible. If not, it call the * static <code>createCloneFor(Prototype)</code> method. * * @param object the prototype object to clone * @returns a copy of the object */ public Object cloneObject(Prototype object) { // More Complex, allows to define what to do if superclass does not support clone try { return object.clone(); } catch (CloneNotSupportedException ex) { return createCloneFor(object); } } /** * Provides an alternative method for cases when the default * <code>clone()</code> method fails. * * @param object the prototype object to clone * @returns a copy of the object */ protected Object createCloneFor(Prototype object) { return null; } }
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