libjava/classpath/java/beans/SimpleBeanInfo.java

/* java.beans.SimpleBeanInfo
   Copyright (C) 1998, 2006, Free Software Foundation, Inc.

This file is part of GNU Classpath.

GNU Classpath is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.

GNU Classpath 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 for more details.

You should have received a copy of the GNU General Public License
along with GNU Classpath; see the file COPYING.  If not, write to the
Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA.

Linking this library statically or dynamically with other modules is
making a combined work based on this library.  Thus, the terms and
conditions of the GNU General Public License cover the whole
combination.

As a special exception, the copyright holders of this library give you
permission to link this library with independent modules to produce an
executable, regardless of the license terms of these independent
modules, and to copy and distribute the resulting executable under
terms of your choice, provided that you also meet, for each linked
independent module, the terms and conditions of the license of that
module.  An independent module is a module which is not derived from
or based on this library.  If you modify this library, you may extend
this exception to your version of the library, but you are not
obligated to do so.  If you do not wish to do so, delete this
exception statement from your version. */


package java.beans;

import java.awt.Image;
import java.awt.Toolkit;
import java.net.URL;

/**
 ** SimpleBeanInfo is a class you may extend to more easily
 ** provide select information to the Introspector.  It
 ** implements all of the methods in BeanInfo by returning
 ** null and forces the Introspector to behave exactly as
 ** if there were no BeanInfo class at all (Introspecting
 ** everything).<P>
 **
 ** Overriding one or two of these functions
 ** to give explicit information on only those things you
 ** wish to give explicit information is perfectly safe,
 ** and even desirable.<P>
 **
 ** See the BeanInfo class for information on what the
 ** various methods actually do.
 **
 ** @author John Keiser
 ** @since JDK1.1
 ** @version 1.1.0, 29 Jul 1998
 ** @see java.beans.BeanInfo
 **/

public class SimpleBeanInfo implements BeanInfo {
        /** Force Introspection of the general bean info.
         ** @return <CODE>null</CODE>.
         **/
        public BeanDescriptor getBeanDescriptor() {
                return null;
        }

        /** Force Introspection of the events this Bean type
         ** fires.
         ** @return <CODE>null</CODE>
         **/
        public EventSetDescriptor[] getEventSetDescriptors() {
                return null;
        }

        /** Say that there is no "default" event set.
         ** @return <CODE>-1</CODE>.
         **/
        public int getDefaultEventIndex() {
                return -1;
        }

        /** Force Introspection of the Bean properties.
         ** @return <CODE>null</CODE>.
         **/
        public PropertyDescriptor[] getPropertyDescriptors() {
                return null;
        }

        /** Say that there is no "default" property.
         ** @return <CODE>-1</CODE>.
         **/
        public int getDefaultPropertyIndex() {
                return -1;
        }

        /** Force Introspection of the Bean's methods.
         ** @return <CODE>null</CODE>.
         **/
        public MethodDescriptor[] getMethodDescriptors() {
                return null;
        }

        /** Tell the Introspector to go look for other BeanInfo
         ** itself.
         ** @return <CODE>null</CODE>.
         **/
        public BeanInfo[] getAdditionalBeanInfo() {
                return null;
        }

        /** Say that this Bean has no icons.
         ** @param iconType the type of icon
         ** @return <CODE>null</CODE>.
         **/
        public Image getIcon(int iconType) {
                return null;
        }

        /** Helper method to load an image using the Bean class
         ** getResource() method on the BeanInfo class (using
         ** getClass(), since you'll extend this class to get
         ** the BeanInfo).  Basically it's assumed that the Bean
         ** and its BeanInfo are both loaded by the same
         ** ClassLoader, generally a reasonable assumption.
         ** @param location the URL relative
         ** @return the Image in question (possibly <code>null</code>).
         **/
        public Image loadImage(String location)
    {
      if (location == null)
        return null;
      URL url = getClass().getResource(location);
      if (url == null)
        return null;
      return Toolkit.getDefaultToolkit().getImage(url);
        }
}