1 /*
   2  * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package javax.swing.plaf.basic;
  27 
  28 import sun.awt.AppContext;
  29 
  30 import javax.swing.*;
  31 
  32 import java.awt.*;
  33 import java.awt.event.*;
  34 import javax.swing.plaf.*;
  35 import java.io.Serializable;
  36 
  37 
  38 /**
  39  * CheckboxUI implementation for BasicCheckboxUI
  40  * <p>
  41  * <strong>Warning:</strong>
  42  * Serialized objects of this class will not be compatible with
  43  * future Swing releases. The current serialization support is
  44  * appropriate for short term storage or RMI between applications running
  45  * the same version of Swing.  As of 1.4, support for long term storage
  46  * of all JavaBeans&trade;
  47  * has been added to the <code>java.beans</code> package.
  48  * Please see {@link java.beans.XMLEncoder}.
  49  *
  50  * @author Jeff Dinkins
  51  */
  52 @SuppressWarnings("serial") // Same-version serialization only
  53 public class BasicCheckBoxUI extends BasicRadioButtonUI {
  54 
  55     private static final Object BASIC_CHECK_BOX_UI_KEY = new Object();
  56 
  57     private static final String propertyPrefix = "CheckBox" + ".";
  58 
  59     // ********************************
  60     //            Create PLAF
  61     // ********************************
  62 
  63     /**
  64      * Returns an instance of {@code BasicCheckBoxUI}.
  65      *
  66      * @param b a component
  67      * @return an instance of {@code BasicCheckBoxUI}
  68      */
  69     public static ComponentUI createUI(JComponent b) {
  70         AppContext appContext = AppContext.getAppContext();
  71         BasicCheckBoxUI checkboxUI =
  72                 (BasicCheckBoxUI) appContext.get(BASIC_CHECK_BOX_UI_KEY);
  73         if (checkboxUI == null) {
  74             checkboxUI = new BasicCheckBoxUI();
  75             appContext.put(BASIC_CHECK_BOX_UI_KEY, checkboxUI);
  76         }
  77         return checkboxUI;
  78     }
  79 
  80     public String getPropertyPrefix() {
  81         return propertyPrefix;
  82     }
  83 
  84 }