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The JGoodies Binding library connects object properties to Swing user interface components. And it helps you represent the state and behavior of a presentation independently of the GUI components used in the interface.
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/*
 * Copyright (c) 2002-2013 JGoodies Software GmbH. All Rights Reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *  o Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 *
 *  o Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *
 *  o Neither the name of JGoodies Software GmbH nor the names of
 *    its contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
 * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package com.jgoodies.binding.adapter;

import static com.jgoodies.common.base.Preconditions.checkNotNull;
import static com.jgoodies.common.internal.Messages.MUST_NOT_BE_NULL;

import java.awt.Color;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;

import javax.swing.colorchooser.DefaultColorSelectionModel;

import com.jgoodies.binding.value.ValueModel;

/**
 * Converts ValueModels to the ColorSelectionModel interface. Useful to bind
 * JColorChooser and similar classes to a ValueModel.
 *
 * Constraints: The subject ValueModel must be of type Color
 * and must allow read-access to its value. Also, it is strongly recommended
 * (though not required) that the underlying ValueModel provides only non-null
 * values. This is so because the ColorSelectionModel behavior is undefined
 * for {@code null} values and it may have unpredictable results.

 *
 * Examples:
 * // Recommended binding style using a factory
 * ValueModel model = presentationModel.getModel(MyBean.PROPERTY_COLOR);
 * JColorChooser colorChooser = BasicComponentFactory.createColorChooser(model);
 *
 * // Binding using the Bindings class
 * ValueModel model = presentationModel.getModel(MyBean.PROPERTY_COLOR);
 * JColorChooser colorChooser = new JColorChooser();
 * Bindings.bind(colorChooser, model);
 *
 * // Hand-made binding
 * ValueModel model = presentationModel.getModel(MyBean.PROPERTY_COLOR);
 * JColorChooser colorChooser = new JColorChooser(new ColorSelectionAdapter(model));
 * 
 *
 * @author Karsten Lentzsch
 * @version $Revision: 1.12 $
 *
 * @see javax.swing.colorchooser.ColorSelectionModel
 * @see javax.swing.JColorChooser
 *
 * @since 1.0.3
 */
public final class ColorSelectionAdapter extends DefaultColorSelectionModel {

    /**
     * Refers to the underlying ValueModel that is used to read and write values.
     */
    private final ValueModel subject;

    /**
     * An optional color that is returned as selected color
     * if the underlying ValueModel returns {@code null}.
     */
    private final Color defaultColor;


    // Instance Creation *****************************************************

    /**
     * Constructs a ColorSelectionAdapter on the given subject ValueModel.
     *
     * @param subject    the subject that holds the value
     * @throws NullPointerException if the subject is {@code null}.
     */
    public ColorSelectionAdapter(ValueModel subject) {
        this(subject, null);
    }


    /**
     * Constructs a ColorSelectionAdapter on the given subject ValueModel.
     *
     * @param subject    the subject that holds the value
     * @param defaultColor an optional default color that is used as
     *     selected color if the subject returns {@code null}
     * @throws NullPointerException if {@code subject} is {@code null}
     */
    public ColorSelectionAdapter(ValueModel subject, Color defaultColor) {
        this.subject = checkNotNull(subject, MUST_NOT_BE_NULL, "subject");
        this.defaultColor = defaultColor;
        subject.addValueChangeListener(new SubjectValueChangeHandler());
    }


    // Overriding Superclass Behavior *****************************************

    /**
     * Returns the selected Color which should be non-{@code null}.
     * The return value is the subject value model's value, if non-null,
     * otherwise the default color. Note that the latter may be null too.
     *
     * @return the selected Color
     *
     * @throws ClassCastException if the subject value is not a Color
     *
     * @see #setSelectedColor(Color)
     */
    @Override
    public Color getSelectedColor() {
        Color subjectColor = (Color) subject.getValue();
        return subjectColor != null ? subjectColor : defaultColor;
    }


    /**
     * Sets the selected color to {@code color}.
     * Note that setting the color to {@code null}
     * is undefined and may have unpredictable results.
     * This method fires a state changed event if it sets the
     * current color to a new non-{@code null} color.
     *
     * @param color the new Color
     *
     * @see   #getSelectedColor()
     */
    @Override
    public void setSelectedColor(Color color) {
        subject.setValue(color);
    }


    // Event Handling *********************************************************

    /**
     * Handles changes in the subject's value.
     */
    private final class SubjectValueChangeHandler implements PropertyChangeListener {

        /**
         * The subject value has changed. Notifies all registered listeners
         * about a state change.
         *
         * @param evt the property change event fired by the subject
         */
        @Override
		public void propertyChange(PropertyChangeEvent evt) {
            fireStateChanged();
        }

    }

}