001 /* java.beans.SimpleBeanInfo 002 Copyright (C) 1998, 2006, Free Software Foundation, Inc. 003 004 This file is part of GNU Classpath. 005 006 GNU Classpath is free software; you can redistribute it and/or modify 007 it under the terms of the GNU General Public License as published by 008 the Free Software Foundation; either version 2, or (at your option) 009 any later version. 010 011 GNU Classpath is distributed in the hope that it will be useful, but 012 WITHOUT ANY WARRANTY; without even the implied warranty of 013 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 014 General Public License for more details. 015 016 You should have received a copy of the GNU General Public License 017 along with GNU Classpath; see the file COPYING. If not, write to the 018 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 019 02110-1301 USA. 020 021 Linking this library statically or dynamically with other modules is 022 making a combined work based on this library. Thus, the terms and 023 conditions of the GNU General Public License cover the whole 024 combination. 025 026 As a special exception, the copyright holders of this library give you 027 permission to link this library with independent modules to produce an 028 executable, regardless of the license terms of these independent 029 modules, and to copy and distribute the resulting executable under 030 terms of your choice, provided that you also meet, for each linked 031 independent module, the terms and conditions of the license of that 032 module. An independent module is a module which is not derived from 033 or based on this library. If you modify this library, you may extend 034 this exception to your version of the library, but you are not 035 obligated to do so. If you do not wish to do so, delete this 036 exception statement from your version. */ 037 038 039 package java.beans; 040 041 import java.awt.Image; 042 import java.awt.Toolkit; 043 import 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 **/ 066 067 public 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 }