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Wed Mar 24 16:00:00 GMT 2004
SingletonInstance
package examples.singleton.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.SingletonProtocol; /** * Implements a concrete instance of the <i>Singleton</i> pattern. It declares * Printer to be Singleton and defines an exception to the Singleton * of the constructor: PrinterSubclass (a subclass of the Singleton) can still * access Printer's constructor. * * @author Jan Hannemann * @author Gregor Kiczales * @version 1.0, 05/13/02 * * @see Printer * @see PrinterSubclass */ public aspect SingletonInstance extends SingletonProtocol { /** * Assigns the Singleton to <code>Printer</code> */ declare parents: Printer implements Singleton; // Alternatively, Printer can just declare to implement it /** * This declaration allows <code>PrinterSubclass</code> (and all its * subclasses) to access <code>Printer</code>'s constructor within * a its constructor (to allow for <code>super()</code> calls). */ protected pointcut protectionExclusions(): call((PrinterSubclass+).new(..)); // To allow access to regular constructor (for subclasses etc.) }
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