Mercurial > hg > blitz_condensed
comparison src/com/go/trove/util/CompleteIntrospector.java @ 0:3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
author | Dan Creswell <dan.creswell@gmail.com> |
---|---|
date | Sat, 21 Mar 2009 11:00:06 +0000 |
parents | |
children |
comparison
equal
deleted
inserted
replaced
-1:000000000000 | 0:3dc0c5604566 |
---|---|
1 /* ==================================================================== | |
2 * Trove - Copyright (c) 1997-2000 Walt Disney Internet Group | |
3 * ==================================================================== | |
4 * The Tea Software License, Version 1.1 | |
5 * | |
6 * Copyright (c) 2000 Walt Disney Internet Group. All rights reserved. | |
7 * | |
8 * Redistribution and use in source and binary forms, with or without | |
9 * modification, are permitted provided that the following conditions | |
10 * are met: | |
11 * | |
12 * 1. Redistributions of source code must retain the above copyright | |
13 * notice, this list of conditions and the following disclaimer. | |
14 * | |
15 * 2. Redistributions in binary form must reproduce the above copyright | |
16 * notice, this list of conditions and the following disclaimer in | |
17 * the documentation and/or other materials provided with the | |
18 * distribution. | |
19 * | |
20 * 3. The end-user documentation included with the redistribution, | |
21 * if any, must include the following acknowledgment: | |
22 * "This product includes software developed by the | |
23 * Walt Disney Internet Group (http://opensource.go.com/)." | |
24 * Alternately, this acknowledgment may appear in the software itself, | |
25 * if and wherever such third-party acknowledgments normally appear. | |
26 * | |
27 * 4. The names "Tea", "TeaServlet", "Kettle", "Trove" and "BeanDoc" must | |
28 * not be used to endorse or promote products derived from this | |
29 * software without prior written permission. For written | |
30 * permission, please contact opensource@dig.com. | |
31 * | |
32 * 5. Products derived from this software may not be called "Tea", | |
33 * "TeaServlet", "Kettle" or "Trove", nor may "Tea", "TeaServlet", | |
34 * "Kettle", "Trove" or "BeanDoc" appear in their name, without prior | |
35 * written permission of the Walt Disney Internet Group. | |
36 * | |
37 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED | |
38 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
39 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | |
40 * DISCLAIMED. IN NO EVENT SHALL THE WALT DISNEY INTERNET GROUP OR ITS | |
41 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, | |
42 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, | |
43 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR | |
44 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY | |
45 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
46 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
47 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
48 * ==================================================================== | |
49 * | |
50 * For more information about Tea, please see http://opensource.go.com/. | |
51 */ | |
52 | |
53 package com.go.trove.util; | |
54 | |
55 import java.beans.*; | |
56 import java.util.*; | |
57 import java.lang.ref.*; | |
58 | |
59 /****************************************************************************** | |
60 * A JavaBean Introspector that ensures interface properties are properly | |
61 * discovered. | |
62 * | |
63 * @author Brian S O'Neill | |
64 * @version | |
65 * <!--$$Revision: 1.1 $-->, <!--$$JustDate:--> 00/12/13 <!-- $--> | |
66 */ | |
67 public class CompleteIntrospector { | |
68 // Weakly maps Class objects to softly referenced PropertyDescriptor maps. | |
69 private static Map cPropertiesCache; | |
70 | |
71 static { | |
72 cPropertiesCache = new IdentityMap(); | |
73 | |
74 // The Introspector has a poor design in that a special GLOBAL setting | |
75 // is used. The default setting has a negative affect because the | |
76 // BeanInfo search path disregards packages. By default, the search | |
77 // path provides a BeanInfo for Component, which is for | |
78 // java.awt.Component. However, any class with this name, in any | |
79 // package, will be given the visible properties of java.awt.Component. | |
80 Introspector.setBeanInfoSearchPath(new String[0]); | |
81 } | |
82 | |
83 /** | |
84 * Test program. | |
85 */ | |
86 public static void main(String[] args) throws Exception { | |
87 Map map = getAllProperties(Class.forName(args[0])); | |
88 Iterator keys = map.keySet().iterator(); | |
89 while (keys.hasNext()) { | |
90 String key = (String)keys.next(); | |
91 PropertyDescriptor desc = (PropertyDescriptor)map.get(key); | |
92 System.out.println(key + " = " + desc); | |
93 } | |
94 } | |
95 | |
96 /** | |
97 * A function that returns a Map of all the available properties on | |
98 * a given class including write-only properties. The properties returned | |
99 * is mostly a superset of those returned from the standard JavaBeans | |
100 * Introspector except more properties are made available to interfaces. | |
101 * | |
102 * @return an unmodifiable mapping of property names (Strings) to | |
103 * PropertyDescriptor objects. | |
104 * | |
105 */ | |
106 public static Map getAllProperties(Class clazz) | |
107 throws IntrospectionException { | |
108 | |
109 synchronized (cPropertiesCache) { | |
110 Map properties; | |
111 | |
112 Reference ref = (Reference)cPropertiesCache.get(clazz); | |
113 if (ref != null) { | |
114 properties = (Map)ref.get(); | |
115 if (properties != null) { | |
116 return properties; | |
117 } | |
118 else { | |
119 // Clean up cleared reference. | |
120 cPropertiesCache.remove(clazz); | |
121 } | |
122 } | |
123 | |
124 properties = Collections.unmodifiableMap(createProperties(clazz)); | |
125 cPropertiesCache.put(clazz, new SoftReference(properties)); | |
126 return properties; | |
127 } | |
128 } | |
129 | |
130 private static Map createProperties(Class clazz) | |
131 throws IntrospectionException { | |
132 | |
133 Map properties = new HashMap(); | |
134 | |
135 if (clazz == null || clazz.isPrimitive()) { | |
136 return properties; | |
137 } | |
138 | |
139 BeanInfo info; | |
140 try { | |
141 info = Introspector.getBeanInfo(clazz); | |
142 } | |
143 catch (LinkageError e) { | |
144 throw new IntrospectionException(e.toString()); | |
145 } | |
146 | |
147 if (info != null) { | |
148 PropertyDescriptor[] pdArray = info.getPropertyDescriptors(); | |
149 | |
150 // Standard properties. | |
151 int length = pdArray.length; | |
152 for (int i=0; i<length; i++) { | |
153 properties.put(pdArray[i].getName(), pdArray[i]); | |
154 } | |
155 } | |
156 | |
157 // Properties defined in Object are also available to interfaces. | |
158 if (clazz.isInterface()) { | |
159 properties.putAll(getAllProperties(Object.class)); | |
160 } | |
161 | |
162 // Ensure that all implemented interfaces are properly analyzed. | |
163 Class[] interfaces = clazz.getInterfaces(); | |
164 for (int i=0; i<interfaces.length; i++) { | |
165 properties.putAll(getAllProperties(interfaces[i])); | |
166 } | |
167 | |
168 // Filter out properties with names that contain '$' characters. | |
169 Iterator it = properties.keySet().iterator(); | |
170 while (it.hasNext()) { | |
171 String propertyName = (String)it.next(); | |
172 if (propertyName.indexOf('$') >= 0) { | |
173 it.remove(); | |
174 } | |
175 } | |
176 | |
177 return properties; | |
178 } | |
179 } |