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Wed Mar 24 16:00:00 GMT 2004
Proxy
package examples.proxy.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): */ /** * Implements a <i>Proxy</i> according to GoF. It implements the * <i>Subject</i> interface as <i>RealSubject</i> does. * * @author Jan Hannemann * @author Gregor Kiczales * @version 1.0, 05/13/02 * * @see Subject * @see Proxy */ public class Proxy implements Subject { /** * a reference to the RealSubject for method forwarding */ private Subject realSubject; /** * An internal counter for the number of calls to <code> * print(String)</code>. */ private int printCalls = 0; /** * Creates a new <i>Proxy</i> with the given <i>RealSubject</i>. * * @param subject The <i>RealSubject</i> to forward method calls to */ public Proxy(Subject subject) { this.realSubject = subject; } /** * Prints the argument string to <code>System.out</code>. This is * equivalent to <code>write(String)</code> * * @param s the string to print */ public void print(String s) { printCalls++; realSubject.print(s); System.out.println("[Proxy:] That was call "+printCalls+" to Subject.print(String)"); } /** * Prints the argument string to <code>System.out</code>. This is * equivalent to <code>print(String)</code> * * @param s the string to print */ public void write(String s) { realSubject.write(s); System.out.println("[Proxy:] Not interested in write calls, but must implement anyway"); } }
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