carfield.com.hk

ButtonCreator.java

2004-03-24T16:00:00Z

Creator.java

2004-03-24T16:00:00Z

package examples.factoryMethod.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 javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JComponent; 
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent; 
import java.awt.Point;

/**
 * Defines the Creator interface with the factoryMethod()
 * method signature and the anOperation() method that uses it. For
 * details, see GoF, page 108. 
 *
 * The factory method is <code>createComponent</code> and it creates
 * A JComponent (a button and a label, repsectively). The anOperation()
 * method <code>showFrame()</code> uses the factory method to show a little
 * GUI. 
 *
 * @author Jan Hannemann
 * @author Gregor Kiczales
 * @version 1.0, 05/13/02
 * 
 * @see ButtonCreator
 * @see LabelCreator
 */ 
 
public abstract class Creator {
 
 /**
 * The factory method to be concretized by subclasses.
 *
 * @returns the created product
 */

 public abstract JComponent createComponent(); 
 
 /**
 * Another factory method to create a title for the GUI frame created by
 * <code>Creator</code>.
 *
 * @returns the title for the GUI frame
 */
 
 public abstract String getTitle(); 

 /** 
 * the position for the next frame to be created (on the screen)
 */
 
 private static Point lastFrameLocation = new Point(0, 0);

 /** 
 * Creates a <code>JFrame</code>, puts the <code>JComponent</code> that
 * is created by the factory method into it and displays the frame. This
 * Method also provides a <code>WindowListener</code>. 
 */
 
 public final void showFrame() {
 JFrame frame = new JFrame(getTitle());
 
 		frame.addWindowListener(new WindowAdapter() {
			public void windowClosing(WindowEvent e) {System.exit(0);}
		});
		 
		JPanel panel = new JPanel();
	
		panel.add(createComponent());
		
		frame.getContentPane().add(panel);
		frame.pack(); 
		frame.setLocation(lastFrameLocation);
		lastFrameLocation.translate(75, 75);
		frame.setVisible(true); 
 }
}

LabelCreator.java

2004-03-24T16:00:00Z

Main.java

2004-03-24T16:00:00Z

package examples.factoryMethod.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 the driver for the FactoryMethod design pattern example. 
 *
 * Intent: Define an interface for creating an object, but let subclasses 
 * decide which class to instantiate. Factory Method lets a class defer 
 * instantiation to subclasses.
 *
 * Participatng objects are <code>ButtonCreator</code> and 
 * <code>LabelCreator</code> as ConcreteCreators. Both implement
 * the <code>Creator</code> interface.
 *
 * In this example, the factory method <code>createComponent</code> creates
 * A JComponent (a button and a label, repsectively). The anOperation()
 * method <code>showFrame()</code> uses the factory method to show a little
 * GUI. In one case, the created frame contains a button, in the other a
 * simple label.
 *
 * This is the Java version.
 *
 * Since the anOperation() method requires an implementation, 
 * Creator has to be an abstract class (as opposed to an interface).
 * Consequently, all ConcreteCreators have to be subclasses of
 * that class and cannot belong to a different inheritance hierarchy.
 *
 * @author Jan Hannemann
 * @author Gregor Kiczales
 * @version 1.0, 05/13/02
 * 
 * @see Creator
 * @see ButtonCreator
 * @see LabelCreator
 */

public class Main {

 /**
 * Implements the driver for the FactoryMethod design pattern example. 
 *
 * In this example, the factory method <code>createComponent</code> creates
 * A JComponent (a button and a label, repsectively). The anOperation()
 * method <code>showFrame()</code> uses the factory method to show a little
 * GUI. In one case, the created frame contains a button, in the other a
 * simple label.
 */ 
 
 public static void main(String[] args) {
 
 Creator creator1 = new ButtonCreator();
 Creator creator2 = new LabelCreator();
 
 creator1.showFrame();
 creator2.showFrame();
 }
}

files.lst

2004-03-24T16:00:00Z