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 BeanDescriptor descriptor = getBeanDescriptor();
106 if (descriptor != null) {
107 Class<?> type = descriptor.getBeanClass();
108 if ((type != null) && (null != type.getAnnotation(JavaBean.class))) {
109 String name = type.getName();
110 int index = name.lastIndexOf('.');
111 if (name.substring(0, index).equals("javax.swing")) {
112 switch (iconKind) {
113 case ICON_COLOR_32x32:
114 return loadImage(name.substring(index + 1), "Color32.gif");
115 case ICON_COLOR_16x16:
116 return loadImage(name.substring(index + 1), "Color16.gif");
117 case ICON_MONO_32x32:
118 return loadImage(name.substring(index + 1), "Mono32.gif");
119 case ICON_MONO_16x16:
120 return loadImage(name.substring(index + 1), "Mono16.gif");
121 }
122 }
123 }
124 }
125 return null;
126 }
127
128 /**
129 * This is a utility method to help in loading icon images.
130 * It takes the name of a resource file associated with the
131 * current object's class file and loads an image object
132 * from that file. Typically images will be GIFs.
133 *
134 * @param resourceName A pathname relative to the directory
135 * holding the class file of the current class. For example,
136 * "wombat.gif".
137 * @return an image object. May be null if the load failed.
138 */
139 public java.awt.Image loadImage(final String resourceName) {
140 try {
141 final Class<?> c = getClass();
142 java.awt.image.ImageProducer ip = (java.awt.image.ImageProducer)
143 java.security.AccessController.doPrivileged(
144 new java.security.PrivilegedAction<Object>() {
145 public Object run() {
146 java.net.URL url;
147 if ((url = c.getResource(resourceName)) == null) {
148 return null;
149 } else {
150 try {
151 return url.getContent();
152 } catch (java.io.IOException ioe) {
153 return null;
154 }
155 }
156 }
157 });
158
159 if (ip == null)
160 return null;
161 java.awt.Toolkit tk = java.awt.Toolkit.getDefaultToolkit();
162 return tk.createImage(ip);
163 } catch (Exception ex) {
164 return null;
165 }
166 }
167
168 private java.awt.Image loadImage(String name, String postfix) {
169 java.awt.Image image = loadImage("/javax/swing/beaninfo/images/" + name + postfix);
170 return (image != null) ? image : loadImage("/javax/swing/beaninfo/images/JComponent" + postfix);
171 }
172 }