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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common
 * Development and Distribution License("CDDL") (collectively, the
 * "License"). You may not use this file except in compliance with the
 * License. You can obtain a copy of the License at
 * http://www.netbeans.org/cddl-gplv2.html
 * or nbbuild/licenses/CDDL-GPL-2-CP. See the License for the
 * specific language governing permissions and limitations under the
 * License.  When distributing the software, include this License Header
 * Notice in each file and include the License file at
 * nbbuild/licenses/CDDL-GPL-2-CP.  Sun designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Sun in the GPL Version 2 section of the License file that
 * accompanied this code. If applicable, add the following below the
 * License Header, with the fields enclosed by brackets [] replaced by
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 * "Portions Copyrighted [year] [name of copyright owner]"
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 * Contributor(s):
 *
 * The Original Software is NetBeans. The Initial Developer of the Original
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 * Microsystems, Inc. All Rights Reserved.
 *
 * If you wish your version of this file to be governed by only the CDDL
 * or only the GPL Version 2, indicate your decision by adding
 * "[Contributor] elects to include this software in this distribution
 * under the [CDDL or GPL Version 2] license." If you do not indicate a
 * single choice of license, a recipient has the option to distribute
 * your version of this file under either the CDDL, the GPL Version 2 or
 * to extend the choice of license to its licensees as provided above.
 * However, if you add GPL Version 2 code and therefore, elected the GPL
 * Version 2 license, then the option applies only if the new code is
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 */

package org.netbeans.modules.form;

import java.awt.*;
import java.beans.*;
import java.lang.ref.Reference;
import java.lang.ref.SoftReference;
import java.util.*;
import java.util.logging.Level;
import java.util.logging.Logger;

import org.netbeans.modules.form.fakepeer.FakePeerSupport;

/**
 * BeanSupport is a utility class with various static methods supporting
 * operations with JavaBeans.
 *
 * @author Ian Formanek, Jan Stola
 */
public class BeanSupport
{
    public static final Object NO_VALUE = new Object();

    // -----------------------------------------------------------------------------
    // Private variables

    private static Map<Class,Object> instancesCache = new HashMap<Class,Object>(30);

    // -----------------------------------------------------------------------------
    // Public methods

    /**
     * Utility method to create an instance of given class. Returns null on
     * error.
     * @param beanClass the class to create inctance of
     * @return new instance of specified class or null if an error occured
     * during instantiation
     */
    public static Object createBeanInstance(Class beanClass) {
        try {
            return CreationFactory.createDefaultInstance(beanClass);
        }
        catch (Exception ex) {
            Logger.getLogger(BeanSupport.class.getName())
                    .log(Level.INFO, "Cannot create default instance of: "+beanClass.getName(), ex); // NOI18N
            return null;
        }
        catch (LinkageError ex) {
            Logger.getLogger(BeanSupport.class.getName())
                    .log(Level.INFO, "Cannot create default instance of: "+beanClass.getName(), ex); // NOI18N
            return null;
        }
    }


    /**
     * Utility method to obtain an instance of specified beanClass. The
     * instance is reused, and thus should only be used to obtain info about
     * settings of default instances of the specified class.
     * @param beanClass the class to create inctance of
     * @return instance of specified class or null if an error occured during
     * instantiation
     */
    public static Object getDefaultInstance(Class beanClass) {
        Object defInstance = instancesCache.get(beanClass);
        if (defInstance == null) {
            defInstance = createBeanInstance(beanClass);
            if (defInstance instanceof Component) {
                FakePeerSupport.attachFakePeer((Component)defInstance);
                if (defInstance instanceof Container)
                    FakePeerSupport.attachFakePeerRecursively(
                                                    (Container)defInstance);
            }
            instancesCache.put(beanClass, defInstance);
        }
        return defInstance;
    }

    /** Utility method that obtains icon for a bean class.
     * (This method is currently used only for obtaining default icons for AWT
     *  components. Other icons should be provided by BeanInfo.)
     * 
     * @param beanClass class of the bean
     * @param iconType not used
     * @return icon for the bean class
     */
    public static Image getBeanIcon(Class beanClass, int iconType) {
        return getIconForDefault(beanClass);
    }

    /** A utility method that returns a class of event adapter for
     * specified listener. It works only on known listeners from java.awt.event.
     * Null is returned for unknown listeners.
     * 
     * @param listener class of the listener
     * @return class of an adapter for specified listener or null if
     *               unknown/does not exist
     */
    public static Class getAdapterForListener(Class listener) {
        if (java.awt.event.ComponentListener.class.equals(listener))
            return java.awt.event.ComponentAdapter.class;
        else if (java.awt.event.ContainerListener.class.equals(listener))
            return java.awt.event.ContainerAdapter.class;
        else if (java.awt.event.FocusListener.class.equals(listener))
            return java.awt.event.FocusAdapter.class;
        else if (java.awt.event.KeyListener.class.equals(listener))
            return java.awt.event.KeyAdapter.class;
        else if (java.awt.event.MouseListener.class.equals(listener))
            return java.awt.event.MouseAdapter.class;
        else if (java.awt.event.MouseMotionListener.class.equals(listener))
            return java.awt.event.MouseMotionAdapter.class;
        else if (java.awt.event.WindowListener.class.equals(listener))
            return java.awt.event.WindowAdapter.class;
        else return null; // not found
    }

    // -----------------------------------------------------------------------------
    // Private methods

    static Reference<Map<String,Object>> imageCache;

    private static synchronized Image getIconForDefault(Class klass) {
        Map<String,Object> icons;
        if ((imageCache == null) || ((icons = imageCache.get()) == null)) {
            icons = createImageCache();
            imageCache = new SoftReference<Map<String,Object>>(icons);
        }
        
        String name = klass.getName();
        Object img = icons.get(name);
        
        if (img == null) {
            return null;
        }
        
        if (img instanceof Image) {
            return (Image) img;
        } else {
            Image image = java.awt.Toolkit.getDefaultToolkit().createImage(
                                 BeanSupport.class.getResource((String)img));
            icons.put(name, image);
            return image;
        }
    }

    private static Map<String,Object> createImageCache() {
        Map<String,Object> map = new HashMap<String,Object>();
        
        map.put("java.awt.Label", "/org/netbeans/modules/form/beaninfo/awt/label.gif"); // NOI18N
        map.put("java.awt.Button", "/org/netbeans/modules/form/beaninfo/awt/button.gif"); // NOI18N
        map.put("java.awt.TextField", "/org/netbeans/modules/form/beaninfo/awt/textfield.gif"); // NOI18N
        map.put("java.awt.TextArea", "/org/netbeans/modules/form/beaninfo/awt/textarea.gif"); // NOI18N
        map.put("java.awt.Checkbox", "/org/netbeans/modules/form/beaninfo/awt/checkbox.gif"); // NOI18N
        map.put("java.awt.Choice", "/org/netbeans/modules/form/beaninfo/awt/choice.gif"); // NOI18N
        map.put("java.awt.List", "/org/netbeans/modules/form/beaninfo/awt/list.gif"); // NOI18N
        map.put("java.awt.Scrollbar", "/org/netbeans/modules/form/beaninfo/awt/scrollbar.gif"); // NOI18N
        map.put("java.awt.ScrollPane", "/org/netbeans/modules/form/beaninfo/awt/scrollpane.gif"); // NOI18N
        map.put("java.awt.Panel", "/org/netbeans/modules/form/beaninfo/awt/panel.gif"); // NOI18N
        map.put("java.awt.Canvas", "/org/netbeans/modules/form/beaninfo/awt/canvas.gif"); // NOI18N
        map.put("java.awt.MenuBar", "/org/netbeans/modules/form/beaninfo/awt/menubar.gif"); // NOI18N
        map.put("java.awt.PopupMenu", "/org/netbeans/modules/form/beaninfo/awt/popupmenu.gif"); // NOI18N
        map.put("java.awt.Menu", "/org/netbeans/modules/form/resources/menu.gif"); // NOI18N
        map.put("java.awt.MenuItem", "/org/netbeans/modules/form/resources/menuItem.gif"); // NOI18N
        map.put("java.awt.CheckboxMenuItem", "/org/netbeans/modules/form/resources/menuItemCheckbox.gif"); // NOI18N
        map.put("org.netbeans.modules.form.Separator", "/org/netbeans/modules/form/resources/menuSeparator.gif"); // NOI18N

        map.put("java.applet.Applet", "/org/netbeans/modules/form/resources/palette/applet.gif"); // NOI18N
        map.put("java.awt.Dialog", "/org/netbeans/modules/form/resources/palette/dialog_16.png"); // NOI18N
        map.put("java.awt.Frame", "/org/netbeans/modules/form/resources/palette/frame_16.png"); // NOI18N

        map.put("javax.swing.JApplet", "/org/netbeans/modules/form/resources/palette/applet.gif"); // NOI18N

        return map;
    }

}
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