345449.vhj5l3oj7.asia

Button.java

2004-03-24T16:00:00Z

package examples.command.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.pattern.
 *
 * Contributor(s): 
 */
 
import javax.swing.JButton;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;

/**
 * Implements a simple extension of JButton that supplies its own 
 * ActionListener and calls its own <code>clicked()</code> method
 * whenever the button is pressed. This method calls the <code>
 * executeCommand()</code> method on the button's associate Command
 * object.
 *
 * @author Jan Hannemann
 * @author Gregor Kiczales
 * @version 1.0, 07/13/02
 */


public class Button extends JButton {

 /**
 * the command object associated with this button
 */
 	
	protected Command command;
	
 /**
 * Creates a new button with the provided label
 *
 * @param name the label of the button
 */

	public Button(String name) {
		super(name);
		this.setActionCommand(name);
		this.addActionListener(new ActionListener() {
				public void actionPerformed(ActionEvent e) {
					clicked(); 
				}
			}); 
	}

 /**
 * Calls <code>ececuteCommand()</code> on the associated 
 * command object. This method gets called whenever the 
 * button is pressed.
 */
	
	public void clicked() {
		if (command != null) {
			command.executeCommand();
		}
	}
	
 /**
 * Sets the associated command object for this button
 *
 * @param command the new Command object.
 */

	public void setCommand(Command command)	{
		this.command = command;
	} 
}

ButtonCommand.java

2004-03-24T16:00:00Z

ButtonCommand2.java

2004-03-24T16:00:00Z

Command.java

2004-03-24T16:00:00Z

Main.java

2004-03-24T16:00:00Z

package examples.command.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.pattern.
 *
 * Contributor(s): 
 */
 
import javax.swing.JFrame; 
import javax.swing.JPanel;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

/**
 * Implements the driver for the command design pattern example. 
 *
 * Intent: Encapsulate a request as an object, thereby letting you 
 * parameterize clients with different requests, queueu or log requests, 
 * and support undoable operations.
 *
 * Participatng objects are <code>Button</code>s as Invokers,
 * and a <code>ButtonCommand</code> and <code>ButtonCommand2</code> as 
 * two concrete Commands.
 *
 * This example creates a simple GUI with three buttons. Each button has a 
 * command associated with it that is executed when the button is pressed. 
 * Button1 and button3 have the same command, button2 has a different one.
 *
 * This is the Java version. 
 *
 * Both commands and invoker have to know of the pattern.
 *
 * @author Jan Hannemann
 * @author Gregor Kiczales
 * @version 1.0, 05/13/02
 * 
 * @see Button
 * @see Command
 * @see ButtonCommand
 * @see Buttoncommand2
 */

public class Main {
	
 /**
 * This example creates a simple GUI with three buttons. Each button has a 
 * command associated with it that is executed when the button is pressed. 
 * Button1 and button3 have the same command, button2 has a different one.
 */
	
	public static void main(String[] args) { 
	 
 	Button button1 = new Button("Button1");
 	Button button2 = new Button("Button2");
 	Button button3 = new Button("Button3"); 
 	
 	Command com1 = new ButtonCommand();
 	Command com2 = new ButtonCommand2();

		JPanel pane = new JPanel();
		pane.add(button1); 
		button1.setCommand(com1);
		
		pane.add(button2);
		button2.setCommand(com2);
		
		pane.add(button3);
		button3.setCommand(com1);
		
		// Note: Can not have two commands.
		// That is within the pattern specification

 JFrame frame = new JFrame("Testing: Command Pattern");		
		
		frame.getContentPane().add(pane);
		frame.addWindowListener(new WindowAdapter() {
			public void windowClosing(WindowEvent e) {System.exit(0);}
		}); 
		frame.pack();
		frame.setVisible(true);
	}
}

files.lst

2004-03-24T16:00:00Z