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Wed Mar 24 16:00:00 GMT 2004
PrintableFlyweightFactory
package examples.flyweight.java; /* -*- 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 java.util.Hashtable; /** * Implements a flyweight factory that employs a creation-on-demand policy * * @author Jan Hannemann * @author Gregor Kiczales * @version 1.0, 05/13/02 * * @see PrintableFlyweight */ public class PrintableFlyweightFactory { /** * stores the existing flyweights by character they represent */ private Hashtable printables = new Hashtable(); /** * Returns the flyweight representing the argument character. * If the appropriate flyweight does not yet exist, it is created * on demand. * * @param c the character for which the the flyweight is returned * @returns the flyweight representing the character */ public PrintableFlyweight getPrintableFlyweight(char c) { Character ch = new Character(c); if (printables.containsKey(ch)) { return (PrintableFlyweight) printables.get(ch); } else { PrintableFlyweight flyweight = null; if (Character.isWhitespace(c)) { flyweight = new WhitespaceFlyweight(c); } else { flyweight = new CharacterFlyweight(c); } printables.put(ch, flyweight); return flyweight; } } }
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