Mercurial > hg > blitz_stable

annotate src/com/go/trove/util/CompleteIntrospector.java @ 27:511648fa4d64 Version 2.1

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Version to 2.1
author Dan Creswell <dan.creswell@gmail.com>
date Mon, 04 Jan 2010 13:00:40 +0000
parents 3dc0c5604566
children
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1 /* ====================================================================
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2 * Trove - Copyright (c) 1997-2000 Walt Disney Internet Group
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3 * ====================================================================
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4 * The Tea Software License, Version 1.1
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5 *
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6 * Copyright (c) 2000 Walt Disney Internet Group. All rights reserved.
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7 *
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8 * Redistribution and use in source and binary forms, with or without
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9 * modification, are permitted provided that the following conditions
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10 * are met:
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11 *
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12 * 1. Redistributions of source code must retain the above copyright
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13 * notice, this list of conditions and the following disclaimer.
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14 *
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15 * 2. Redistributions in binary form must reproduce the above copyright
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16 * notice, this list of conditions and the following disclaimer in
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17 * the documentation and/or other materials provided with the
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18 * distribution.
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19 *
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20 * 3. The end-user documentation included with the redistribution,
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21 * if any, must include the following acknowledgment:
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22 * "This product includes software developed by the
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23 * Walt Disney Internet Group (http://opensource.go.com/)."
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24 * Alternately, this acknowledgment may appear in the software itself,
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25 * if and wherever such third-party acknowledgments normally appear.
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26 *
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27 * 4. The names "Tea", "TeaServlet", "Kettle", "Trove" and "BeanDoc" must
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28 * not be used to endorse or promote products derived from this
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29 * software without prior written permission. For written
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30 * permission, please contact opensource@dig.com.
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31 *
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32 * 5. Products derived from this software may not be called "Tea",
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33 * "TeaServlet", "Kettle" or "Trove", nor may "Tea", "TeaServlet",
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34 * "Kettle", "Trove" or "BeanDoc" appear in their name, without prior
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35 * written permission of the Walt Disney Internet Group.
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36 *
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37 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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38 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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39 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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40 * DISCLAIMED. IN NO EVENT SHALL THE WALT DISNEY INTERNET GROUP OR ITS
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41 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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42 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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43 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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44 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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45 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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46 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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47 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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48 * ====================================================================
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49 *
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50 * For more information about Tea, please see http://opensource.go.com/.
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51 */
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52
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53 package com.go.trove.util;
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54
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55 import java.beans.*;
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56 import java.util.*;
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57 import java.lang.ref.*;
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58
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59 /******************************************************************************
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60 * A JavaBean Introspector that ensures interface properties are properly
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61 * discovered.
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62 *
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63 * @author Brian S O'Neill
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64 * @version
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65 * <!--$$Revision: 1.1 $-->, <!--$$JustDate:--> 00/12/13 <!-- $-->
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66 */
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67 public class CompleteIntrospector {
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68 // Weakly maps Class objects to softly referenced PropertyDescriptor maps.
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69 private static Map cPropertiesCache;
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70
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71 static {
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72 cPropertiesCache = new IdentityMap();
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73
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74 // The Introspector has a poor design in that a special GLOBAL setting
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75 // is used. The default setting has a negative affect because the
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76 // BeanInfo search path disregards packages. By default, the search
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77 // path provides a BeanInfo for Component, which is for
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78 // java.awt.Component. However, any class with this name, in any
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79 // package, will be given the visible properties of java.awt.Component.
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80 Introspector.setBeanInfoSearchPath(new String[0]);
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81 }
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82
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83 /**
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84 * Test program.
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85 */
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86 public static void main(String[] args) throws Exception {
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87 Map map = getAllProperties(Class.forName(args[0]));
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88 Iterator keys = map.keySet().iterator();
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89 while (keys.hasNext()) {
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90 String key = (String)keys.next();
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91 PropertyDescriptor desc = (PropertyDescriptor)map.get(key);
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92 System.out.println(key + " = " + desc);
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93 }
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94 }
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95
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96 /**
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97 * A function that returns a Map of all the available properties on
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98 * a given class including write-only properties. The properties returned
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99 * is mostly a superset of those returned from the standard JavaBeans
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100 * Introspector except more properties are made available to interfaces.
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101 *
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102 * @return an unmodifiable mapping of property names (Strings) to
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103 * PropertyDescriptor objects.
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104 *
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105 */
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106 public static Map getAllProperties(Class clazz)
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107 throws IntrospectionException {
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108
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109 synchronized (cPropertiesCache) {
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110 Map properties;
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111
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112 Reference ref = (Reference)cPropertiesCache.get(clazz);
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113 if (ref != null) {
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114 properties = (Map)ref.get();
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115 if (properties != null) {
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116 return properties;
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117 }
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118 else {
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119 // Clean up cleared reference.
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120 cPropertiesCache.remove(clazz);
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121 }
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122 }
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123
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124 properties = Collections.unmodifiableMap(createProperties(clazz));
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125 cPropertiesCache.put(clazz, new SoftReference(properties));
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126 return properties;
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127 }
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128 }
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129
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130 private static Map createProperties(Class clazz)
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131 throws IntrospectionException {
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132
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133 Map properties = new HashMap();
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134
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135 if (clazz == null || clazz.isPrimitive()) {
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136 return properties;
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137 }
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138
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139 BeanInfo info;
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140 try {
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141 info = Introspector.getBeanInfo(clazz);
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142 }
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143 catch (LinkageError e) {
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144 throw new IntrospectionException(e.toString());
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145 }
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146
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147 if (info != null) {
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148 PropertyDescriptor[] pdArray = info.getPropertyDescriptors();
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149
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150 // Standard properties.
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151 int length = pdArray.length;
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152 for (int i=0; i<length; i++) {
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153 properties.put(pdArray[i].getName(), pdArray[i]);
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154 }
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155 }
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156
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157 // Properties defined in Object are also available to interfaces.
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158 if (clazz.isInterface()) {
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159 properties.putAll(getAllProperties(Object.class));
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160 }
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161
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162 // Ensure that all implemented interfaces are properly analyzed.
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163 Class[] interfaces = clazz.getInterfaces();
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164 for (int i=0; i<interfaces.length; i++) {
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165 properties.putAll(getAllProperties(interfaces[i]));
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166 }
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167
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168 // Filter out properties with names that contain '$' characters.
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169 Iterator it = properties.keySet().iterator();
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170 while (it.hasNext()) {
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171 String propertyName = (String)it.next();
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172 if (propertyName.indexOf('$') >= 0) {
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173 it.remove();
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174 }
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175 }
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176
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177 return properties;
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178 }
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179 }