1 /*
2 * Copyright 1996-1998 Sun Microsystems, Inc. All Rights Reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Sun designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Sun in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
22 * CA 95054 USA or visit www.sun.com if you need additional information or
23 * have any questions.
24 */
25
26 package java.beans;
27
28 /**
29 * This is a support class to make it easier for people to provide
30 * BeanInfo classes.
31 * <p>
32 * It defaults to providing "noop" information, and can be selectively
33 * overriden to provide more explicit information on chosen topics.
34 * When the introspector sees the "noop" values, it will apply low
35 * level introspection and design patterns to automatically analyze
36 * the target bean.
37 */
38
39 public class SimpleBeanInfo implements BeanInfo {
40
41 /**
42 * Deny knowledge about the class and customizer of the bean.
43 * You can override this if you wish to provide explicit info.
44 */
45 public BeanDescriptor getBeanDescriptor() {
46 return null;
47 }
48
49 /**
50 * Deny knowledge of properties. You can override this
51 * if you wish to provide explicit property info.
52 */
53 public PropertyDescriptor[] getPropertyDescriptors() {
54 return null;
55 }
56
57 /**
58 * Deny knowledge of a default property. You can override this
59 * if you wish to define a default property for the bean.
60 */
61 public int getDefaultPropertyIndex() {
62 return -1;
63 }
64
65 /**
66 * Deny knowledge of event sets. You can override this
67 * if you wish to provide explicit event set info.
68 */
69 public EventSetDescriptor[] getEventSetDescriptors() {
70 return null;
71 }
72
73 /**
74 * Deny knowledge of a default event. You can override this
75 * if you wish to define a default event for the bean.
76 */
77 public int getDefaultEventIndex() {
78 return -1;
79 }
80
81 /**
82 * Deny knowledge of methods. You can override this
83 * if you wish to provide explicit method info.
84 */
85 public MethodDescriptor[] getMethodDescriptors() {
86 return null;
87 }
88
89 /**
90 * Claim there are no other relevant BeanInfo objects. You
91 * may override this if you want to (for example) return a
92 * BeanInfo for a base class.
93 */
94 public BeanInfo[] getAdditionalBeanInfo() {
95 return null;
96 }
97
98 /**
99 * Claim there are no icons available. You can override
100 * this if you want to provide icons for your bean.
101 */
102 public java.awt.Image getIcon(int iconKind) {
103 return null;
104 }
105
106 /**
107 * This is a utility method to help in loading icon images.
108 * It takes the name of a resource file associated with the
109 * current object's class file and loads an image object
110 * from that file. Typically images will be GIFs.
111 * <p>
112 * @param resourceName A pathname relative to the directory
113 * holding the class file of the current class. For example,
114 * "wombat.gif".
115 * @return an image object. May be null if the load failed.
116 */
117 public java.awt.Image loadImage(final String resourceName) {
118 try {
119 final Class c = getClass();
120 java.awt.image.ImageProducer ip = (java.awt.image.ImageProducer)
121 java.security.AccessController.doPrivileged(
122 new java.security.PrivilegedAction() {
123 public Object run() {
124 java.net.URL url;
125 if ((url = c.getResource(resourceName)) == null) {
126 return null;
127 } else {
128 try {
129 return url.getContent();
130 } catch (java.io.IOException ioe) {
131 return null;
132 }
133 }
134 }
135 });
136
137 if (ip == null)
138 return null;
139 java.awt.Toolkit tk = java.awt.Toolkit.getDefaultToolkit();
140 return tk.createImage(ip);
141 } catch (Exception ex) {
142 return null;
143 }
144 }
145
146 }
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