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Wed Mar 24 16:00:00 GMT 2004
Point
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.awt.Color; import java.util.HashSet; import java.util.Iterator; /** * Represents a point with x and y coordinates and a color. * * @author Jan Hannemann * @author Gregor Kiczales * @version 1.0, 05/13/02 */ public class Point implements Subject { /** * stores the observers for this point (subject) */ private HashSet observers; /** * the point's x-coordinate */ private int x; /** * the point's y-coordinate */ private int y; /** * the point's current color */ private Color color; /** * Creates a new point object based on x and y coordinates and color. */ public Point(int x, int y, Color color) { this.x=x; this.y=y; this.color=color; this.observers = new HashSet(); } /** * Returns the point's current x-coordinate. * * @return the current x-coordinate */ public int getX() { return x; } /** * Returns the point's current y-coordinate. * * @return the current y-coordinate */ public int getY() { return y; } /** * Sets the current x-coordinate. * * @param x the new x-coordinate */ public void setX(int x) { this.x=x; notifyObservers(); } /** * Sets the current y-coordinate. * * @param y the new y-coordinate */ public void setY(int y) { this.y=y; notifyObservers(); } /** * Returns the point's current color. * * @return the current color */ public Color getColor() { return color; } /** * Sets the current color. * * @param color the new color */ public void setColor(Color color) { this.color=color; 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); } } }
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