1 /*
2 * Copyright (c) 1996, 2011, Oracle and/or its affiliates. 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. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * 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 * @since 1.1
39 */
40
41 public class SimpleBeanInfo implements BeanInfo {
42
43 /**
44 * Deny knowledge about the class and customizer of the bean.
45 * You can override this if you wish to provide explicit info.
46 */
47 public BeanDescriptor getBeanDescriptor() {
48 return null;
49 }
50
51 /**
52 * Deny knowledge of properties. You can override this
53 * if you wish to provide explicit property info.
54 */
55 public PropertyDescriptor[] getPropertyDescriptors() {
56 return null;
57 }
58
59 /**
60 * Deny knowledge of a default property. You can override this
61 * if you wish to define a default property for the bean.
62 */
63 public int getDefaultPropertyIndex() {
64 return -1;
65 }
66
67 /**
68 * Deny knowledge of event sets. You can override this
69 * if you wish to provide explicit event set info.
70 */
71 public EventSetDescriptor[] getEventSetDescriptors() {
72 return null;
73 }
74
75 /**
76 * Deny knowledge of a default event. You can override this
77 * if you wish to define a default event for the bean.
78 */
79 public int getDefaultEventIndex() {
80 return -1;
81 }
82
83 /**
84 * Deny knowledge of methods. You can override this
85 * if you wish to provide explicit method info.
86 */
87 public MethodDescriptor[] getMethodDescriptors() {
88 return null;
89 }
90
91 /**
92 * Claim there are no other relevant BeanInfo objects. You
93 * may override this if you want to (for example) return a
94 * BeanInfo for a base class.
95 */
96 public BeanInfo[] getAdditionalBeanInfo() {
97 return null;
98 }
99
100 /**
101 * Claim there are no icons available. You can override
102 * this if you want to provide icons for your bean.
103 */
104 public java.awt.Image getIcon(int iconKind) {
105 return null;
106 }
107
108 /**
109 * This is a utility method to help in loading icon images.
110 * It takes the name of a resource file associated with the
111 * current object's class file and loads an image object
112 * from that file. Typically images will be GIFs.
113 *
114 * @param resourceName A pathname relative to the directory
115 * holding the class file of the current class. For example,
116 * "wombat.gif".
117 * @return an image object. May be null if the load failed.
118 */
119 public java.awt.Image loadImage(final String resourceName) {
120 try {
121 final Class<?> c = getClass();
122 java.awt.image.ImageProducer ip = (java.awt.image.ImageProducer)
123 java.security.AccessController.doPrivileged(
124 new java.security.PrivilegedAction<Object>() {
125 public Object run() {
126 java.net.URL url;
127 if ((url = c.getResource(resourceName)) == null) {
128 return null;
129 } else {
130 try {
131 return url.getContent();
132 } catch (java.io.IOException ioe) {
133 return null;
134 }
135 }
136 }
137 });
138
139 if (ip == null)
140 return null;
141 java.awt.Toolkit tk = java.awt.Toolkit.getDefaultToolkit();
142 return tk.createImage(ip);
143 } catch (Exception ex) {
144 return null;
145 }
146 }
147
148 }