001/* java.beans.SimpleBeanInfo
002   Copyright (C) 1998, 2006, Free Software Foundation, Inc.
003
004This file is part of GNU Classpath.
005
006GNU Classpath is free software; you can redistribute it and/or modify
007it under the terms of the GNU General Public License as published by
008the Free Software Foundation; either version 2, or (at your option)
009any later version.
010
011GNU Classpath is distributed in the hope that it will be useful, but
012WITHOUT ANY WARRANTY; without even the implied warranty of
013MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
014General Public License for more details.
015
016You should have received a copy of the GNU General Public License
017along with GNU Classpath; see the file COPYING.  If not, write to the
018Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
01902110-1301 USA.
020
021Linking this library statically or dynamically with other modules is
022making a combined work based on this library.  Thus, the terms and
023conditions of the GNU General Public License cover the whole
024combination.
025
026As a special exception, the copyright holders of this library give you
027permission to link this library with independent modules to produce an
028executable, regardless of the license terms of these independent
029modules, and to copy and distribute the resulting executable under
030terms of your choice, provided that you also meet, for each linked
031independent module, the terms and conditions of the license of that
032module.  An independent module is a module which is not derived from
033or based on this library.  If you modify this library, you may extend
034this exception to your version of the library, but you are not
035obligated to do so.  If you do not wish to do so, delete this
036exception statement from your version. */
037
038
039package java.beans;
040
041import java.awt.Image;
042import java.awt.Toolkit;
043import java.net.URL;
044
045/**
046 ** SimpleBeanInfo is a class you may extend to more easily
047 ** provide select information to the Introspector.  It
048 ** implements all of the methods in BeanInfo by returning
049 ** null and forces the Introspector to behave exactly as
050 ** if there were no BeanInfo class at all (Introspecting
051 ** everything).<P>
052 **
053 ** Overriding one or two of these functions
054 ** to give explicit information on only those things you
055 ** wish to give explicit information is perfectly safe,
056 ** and even desirable.<P>
057 **
058 ** See the BeanInfo class for information on what the
059 ** various methods actually do.
060 **
061 ** @author John Keiser
062 ** @since JDK1.1
063 ** @version 1.1.0, 29 Jul 1998
064 ** @see java.beans.BeanInfo
065 **/
066
067public class SimpleBeanInfo implements BeanInfo {
068        /** Force Introspection of the general bean info.
069         ** @return <CODE>null</CODE>.
070         **/
071        public BeanDescriptor getBeanDescriptor() {
072                return null;
073        }
074
075        /** Force Introspection of the events this Bean type
076         ** fires.
077         ** @return <CODE>null</CODE>
078         **/
079        public EventSetDescriptor[] getEventSetDescriptors() {
080                return null;
081        }
082
083        /** Say that there is no "default" event set.
084         ** @return <CODE>-1</CODE>.
085         **/
086        public int getDefaultEventIndex() {
087                return -1;
088        }
089
090        /** Force Introspection of the Bean properties.
091         ** @return <CODE>null</CODE>.
092         **/
093        public PropertyDescriptor[] getPropertyDescriptors() {
094                return null;
095        }
096
097        /** Say that there is no "default" property.
098         ** @return <CODE>-1</CODE>.
099         **/
100        public int getDefaultPropertyIndex() {
101                return -1;
102        }
103
104        /** Force Introspection of the Bean's methods.
105         ** @return <CODE>null</CODE>.
106         **/
107        public MethodDescriptor[] getMethodDescriptors() {
108                return null;
109        }
110
111        /** Tell the Introspector to go look for other BeanInfo
112         ** itself.
113         ** @return <CODE>null</CODE>.
114         **/
115        public BeanInfo[] getAdditionalBeanInfo() {
116                return null;
117        }
118
119        /** Say that this Bean has no icons.
120         ** @param iconType the type of icon
121         ** @return <CODE>null</CODE>.
122         **/
123        public Image getIcon(int iconType) {
124                return null;
125        }
126
127        /** Helper method to load an image using the Bean class
128         ** getResource() method on the BeanInfo class (using
129         ** getClass(), since you'll extend this class to get
130         ** the BeanInfo).  Basically it's assumed that the Bean
131         ** and its BeanInfo are both loaded by the same
132         ** ClassLoader, generally a reasonable assumption.
133         ** @param location the URL relative
134         ** @return the Image in question (possibly <code>null</code>).
135         **/
136        public Image loadImage(String location)
137    {
138      if (location == null)
139        return null;
140      URL url = getClass().getResource(location);
141      if (url == null)
142        return null;
143      return Toolkit.getDefaultToolkit().getImage(url);
144        }
145}