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Wed Mar 24 16:00:00 GMT 2004
FlyweightImplementation
package examples.flyweight.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.FlyweightProtocol; /** * Implements a concrete instance of the flyweight pattern. * * * @author Jan Hannemann * @author Gregor Kiczales * @version 1.0, 05/13/02 * */ public aspect FlyweightImplementation extends FlyweightProtocol { /** * Assigns the <i>Flyweight</i> role to CharacterFlyweight. */ declare parents: CharacterFlyweight implements Flyweight; /** * Assigns the <i>Flyweight</i> role to WhitespaceFlyweight. */ declare parents: WhitespaceFlyweight implements Flyweight; /** * Actually creates the flyweight for a key. This method is called by * <code>getFlyweight(Object)</code> if the flyweight does not already * exist. * * @param key the key identifying the particular flyweight * @returns the flyweight representing the key */ protected Flyweight createFlyweight(Object key) { char c = ((Character) key).charValue(); Flyweight flyweight = null; if (Character.isWhitespace(c)) { flyweight = new WhitespaceFlyweight(c); } else { flyweight = new CharacterFlyweight(c); } return flyweight; } /** * Provides a custom interface to access the flyweights. Refers to the * general <code>getFlyweight(Object)</code> method defined on the * abstract aspect. * * @param c the character identifying the particular flyweight * @returns the flyweight representing the character */ public PrintableFlyweight getPrintableFlyweight(char c) { Character ch = new Character(c); return (PrintableFlyweight) getFlyweight(ch); } }
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