src/java.desktop/share/classes/javax/swing/plaf/basic/BasicCheckBoxUI.java

/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
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 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
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package javax.swing.plaf.basic;

import sun.awt.AppContext;

import javax.swing.*;

import java.awt.*;
import java.awt.event.*;
import javax.swing.plaf.*;
import java.io.Serializable;


/**
 * CheckboxUI implementation for BasicCheckboxUI
 * <p>
 * <strong>Warning:</strong>
 * Serialized objects of this class will not be compatible with
 * future Swing releases. The current serialization support is
 * appropriate for short term storage or RMI between applications running
 * the same version of Swing.  As of 1.4, support for long term storage
 * of all JavaBeans
 * has been added to the <code>java.beans</code> package.
 * Please see {@link java.beans.XMLEncoder}.
 *
 * @author Jeff Dinkins
 */
public class BasicCheckBoxUI extends BasicRadioButtonUI {

    private static final Object BASIC_CHECK_BOX_UI_KEY = new Object();

    private static final String propertyPrefix = "CheckBox" + ".";

    // ********************************
    //            Create PLAF
    // ********************************

    /**
     * Constructs a {@code BasicCheckBoxUI}.
     */
    public BasicCheckBoxUI() {}

    /**
     * Returns an instance of {@code BasicCheckBoxUI}.
     *
     * @param b a component
     * @return an instance of {@code BasicCheckBoxUI}
     */
    public static ComponentUI createUI(JComponent b) {
        AppContext appContext = AppContext.getAppContext();
        BasicCheckBoxUI checkboxUI =
                (BasicCheckBoxUI) appContext.get(BASIC_CHECK_BOX_UI_KEY);
        if (checkboxUI == null) {
            checkboxUI = new BasicCheckBoxUI();
            appContext.put(BASIC_CHECK_BOX_UI_KEY, checkboxUI);
        }
        return checkboxUI;
    }

    public String getPropertyPrefix() {
        return propertyPrefix;
    }

}