1 /* java.beans.SimpleBeanInfo 2 Copyright (C) 1998, 2006, Free Software Foundation, Inc. 3 4 This file is part of GNU Classpath. 5 6 GNU Classpath is free software; you can redistribute it and/or modify 7 it under the terms of the GNU General Public License as published by 8 the Free Software Foundation; either version 2, or (at your option) 9 any later version. 10 11 GNU Classpath is distributed in the hope that it will be useful, but 12 WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 General Public License for more details. 15 16 You should have received a copy of the GNU General Public License 17 along with GNU Classpath; see the file COPYING. If not, write to the 18 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 19 02110-1301 USA. 20 21 Linking this library statically or dynamically with other modules is 22 making a combined work based on this library. Thus, the terms and 23 conditions of the GNU General Public License cover the whole 24 combination. 25 26 As a special exception, the copyright holders of this library give you 27 permission to link this library with independent modules to produce an 28 executable, regardless of the license terms of these independent 29 modules, and to copy and distribute the resulting executable under 30 terms of your choice, provided that you also meet, for each linked 31 independent module, the terms and conditions of the license of that 32 module. An independent module is a module which is not derived from 33 or based on this library. If you modify this library, you may extend 34 this exception to your version of the library, but you are not 35 obligated to do so. If you do not wish to do so, delete this 36 exception statement from your version. */ 37 38 39 package java.beans; 40 41 import java.awt.Image; 42 import java.awt.Toolkit; 43 import java.net.URL; 44 45 /** 46 ** SimpleBeanInfo is a class you may extend to more easily 47 ** provide select information to the Introspector. It 48 ** implements all of the methods in BeanInfo by returning 49 ** null and forces the Introspector to behave exactly as 50 ** if there were no BeanInfo class at all (Introspecting 51 ** everything).<P> 52 ** 53 ** Overriding one or two of these functions 54 ** to give explicit information on only those things you 55 ** wish to give explicit information is perfectly safe, 56 ** and even desirable.<P> 57 ** 58 ** See the BeanInfo class for information on what the 59 ** various methods actually do. 60 ** 61 ** @author John Keiser 62 ** @since JDK1.1 63 ** @version 1.1.0, 29 Jul 1998 64 ** @see java.beans.BeanInfo 65 **/ 66 67 public class SimpleBeanInfo implements BeanInfo { 68 /** Force Introspection of the general bean info. 69 ** @return <CODE>null</CODE>. 70 **/ getBeanDescriptor()71 public BeanDescriptor getBeanDescriptor() { 72 return null; 73 } 74 75 /** Force Introspection of the events this Bean type 76 ** fires. 77 ** @return <CODE>null</CODE> 78 **/ getEventSetDescriptors()79 public EventSetDescriptor[] getEventSetDescriptors() { 80 return null; 81 } 82 83 /** Say that there is no "default" event set. 84 ** @return <CODE>-1</CODE>. 85 **/ getDefaultEventIndex()86 public int getDefaultEventIndex() { 87 return -1; 88 } 89 90 /** Force Introspection of the Bean properties. 91 ** @return <CODE>null</CODE>. 92 **/ getPropertyDescriptors()93 public PropertyDescriptor[] getPropertyDescriptors() { 94 return null; 95 } 96 97 /** Say that there is no "default" property. 98 ** @return <CODE>-1</CODE>. 99 **/ getDefaultPropertyIndex()100 public int getDefaultPropertyIndex() { 101 return -1; 102 } 103 104 /** Force Introspection of the Bean's methods. 105 ** @return <CODE>null</CODE>. 106 **/ getMethodDescriptors()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 **/ getAdditionalBeanInfo()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 **/ getIcon(int iconType)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 **/ loadImage(String location)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 } 146