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Wed Mar 24 16:00:00 GMT 2004
Creator
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 <i>Creator</i> interface with the <i>factoryMethod()</i> * method signature and the <i>anOperation()</i> method that uses it. For * details, see GoF, page 108.<p> * * The factory method is <code>createComponent</code> and it creates * A JComponent (a button and a label, repsectively). The <i>anOperation()</i> * 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); } }
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