Mercurial > hg > blitz_condensed
annotate src/com/go/trove/util/CompleteIntrospector.java @ 34:6f68e94c1fb8 default tip
Add CondensedStats monitoring utility, equivalent to vmstat
author | Dominic Cleal <dominic-cleal@cdo2.com> |
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date | Thu, 05 Aug 2010 11:07:25 +0100 |
parents | 3dc0c5604566 |
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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 } |