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Wed Mar 24 16:00:00 GMT 2004
Screen
package examples.observer.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.HashSet; import java.util.Iterator; /** * Provides a means to output messages. This class is a placeholder for an * output device. * * @author Jan Hannemann * @author Gregor Kiczales * @version 1.0, 05/13/02 */ public class Screen implements Subject, Observer { /** * stores the observers for this screen (subject) */ private HashSet observers; /** * the individual name of this screen object */ private String name; /** * creates a new <code>Screen</code> object with the provided name. * * @param name the name for the new <code>Screen</code> object */ public Screen(String s) { this.name = s; observers = new HashSet(); } /** * Prints the name of the <code>Screen</code> object and the argument * string to stdout. * * @param s the string to print */ public void display (String s) { System.out.println(name + ": " + s); notifyObservers(); } public void attach(Observer o) { this.observers.add(o); } public void detach(Observer o) { this.observers.remove(o); } public void notifyObservers() { for (Iterator e = observers.iterator() ; e.hasNext() ;) { ((Observer)e.next()).update(this); } } public void update(Subject s) { display("update received from a "+s.getClass().getName()+" object"); } }
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