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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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