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annotate src/org/eclipse/jetty/util/ajax/JSONPojoConvertor.java @ 803:166b16bda630

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remove org.eclipse.jetty.util.preventers
author Franklin Schmidt <fschmidt@gmail.com>
date Wed, 07 Sep 2016 21:21:32 -0600
parents 3428c60d7cfc
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1 //
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2 // ========================================================================
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3 // Copyright (c) 1995-2014 Mort Bay Consulting Pty. Ltd.
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4 // ------------------------------------------------------------------------
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5 // All rights reserved. This program and the accompanying materials
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6 // are made available under the terms of the Eclipse Public License v1.0
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7 // and Apache License v2.0 which accompanies this distribution.
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8 //
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9 // The Eclipse Public License is available at
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10 // http://www.eclipse.org/legal/epl-v10.html
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11 //
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12 // The Apache License v2.0 is available at
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13 // http://www.opensource.org/licenses/apache2.0.php
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14 //
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15 // You may elect to redistribute this code under either of these licenses.
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16 // ========================================================================
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17 //
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18
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19 package org.eclipse.jetty.util.ajax;
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20
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21 import java.lang.reflect.Array;
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22 import java.lang.reflect.InvocationTargetException;
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23 import java.lang.reflect.Method;
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24 import java.lang.reflect.Modifier;
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25 import java.util.Arrays;
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26 import java.util.HashMap;
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27 import java.util.HashSet;
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28 import java.util.Iterator;
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29 import java.util.Locale;
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30 import java.util.Map;
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31 import java.util.Set;
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32
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33 import org.eclipse.jetty.util.ajax.JSON.Output;
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34 import org.eclipse.jetty.util.log.Log;
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35 import org.eclipse.jetty.util.log.Logger;
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36 /**
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37 * Converts POJOs to JSON and vice versa.
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38 * The key difference:
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39 * - returns the actual object from Convertor.fromJSON (JSONObjectConverter returns a Map)
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40 * - the getters/setters are resolved at initialization (JSONObjectConverter resolves it at runtime)
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41 * - correctly sets the number fields
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42 *
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43 */
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44 public class JSONPojoConvertor implements JSON.Convertor
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45 {
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46 private static final Logger LOG = Log.getLogger(JSONPojoConvertor.class);
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47 public static final Object[] GETTER_ARG = new Object[]{}, NULL_ARG = new Object[]{null};
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48 private static final Map<Class<?>, NumberType> __numberTypes = new HashMap<Class<?>, NumberType>();
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49
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50 public static NumberType getNumberType(Class<?> clazz)
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51 {
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52 return __numberTypes.get(clazz);
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53 }
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54
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55 protected boolean _fromJSON;
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56 protected Class<?> _pojoClass;
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57 protected Map<String,Method> _getters = new HashMap<String,Method>();
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58 protected Map<String,Setter> _setters = new HashMap<String,Setter>();
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59 protected Set<String> _excluded;
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60
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61 /**
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62 * @param pojoClass The class to convert
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63 */
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64 public JSONPojoConvertor(Class<?> pojoClass)
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65 {
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66 this(pojoClass, (Set<String>)null, true);
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67 }
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68
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69 /**
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70 * @param pojoClass The class to convert
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71 * @param excluded The fields to exclude
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72 */
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73 public JSONPojoConvertor(Class<?> pojoClass, String[] excluded)
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74 {
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75 this(pojoClass, new HashSet<String>(Arrays.asList(excluded)), true);
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76 }
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77
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78 /**
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79 * @param pojoClass The class to convert
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80 * @param excluded The fields to exclude
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81 */
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82 public JSONPojoConvertor(Class<?> pojoClass, Set<String> excluded)
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83 {
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84 this(pojoClass, excluded, true);
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85 }
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86
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87 /**
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88 * @param pojoClass The class to convert
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89 * @param excluded The fields to exclude
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90 * @param fromJSON If true, add a class field to the JSON
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91 */
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92 public JSONPojoConvertor(Class<?> pojoClass, Set<String> excluded, boolean fromJSON)
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93 {
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94 _pojoClass = pojoClass;
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95 _excluded = excluded;
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96 _fromJSON = fromJSON;
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97 init();
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98 }
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99
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100 /**
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101 * @param pojoClass The class to convert
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102 * @param fromJSON If true, add a class field to the JSON
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103 */
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104 public JSONPojoConvertor(Class<?> pojoClass, boolean fromJSON)
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105 {
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106 this(pojoClass, (Set<String>)null, fromJSON);
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107 }
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108
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109 /* ------------------------------------------------------------ */
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110 protected void init()
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111 {
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112 Method[] methods = _pojoClass.getMethods();
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113 for (int i=0;i<methods.length;i++)
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114 {
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115 Method m=methods[i];
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116 if (!Modifier.isStatic(m.getModifiers()) && m.getDeclaringClass()!=Object.class)
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117 {
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118 String name=m.getName();
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119 switch(m.getParameterTypes().length)
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120 {
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121 case 0:
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122
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123 if(m.getReturnType()!=null)
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124 {
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125 if (name.startsWith("is") && name.length()>2)
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126 name=name.substring(2,3).toLowerCase(Locale.ENGLISH)+name.substring(3);
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127 else if (name.startsWith("get") && name.length()>3)
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128 name=name.substring(3,4).toLowerCase(Locale.ENGLISH)+name.substring(4);
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129 else
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130 break;
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131 if(includeField(name, m))
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132 addGetter(name, m);
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133 }
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134 break;
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135 case 1:
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136 if (name.startsWith("set") && name.length()>3)
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137 {
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138 name=name.substring(3,4).toLowerCase(Locale.ENGLISH)+name.substring(4);
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139 if(includeField(name, m))
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140 addSetter(name, m);
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141 }
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142 break;
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143 }
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144 }
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145 }
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146 }
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147
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148 /* ------------------------------------------------------------ */
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149 protected void addGetter(String name, Method method)
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150 {
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151 _getters.put(name, method);
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152 }
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153
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154 /* ------------------------------------------------------------ */
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155 protected void addSetter(String name, Method method)
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156 {
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157 _setters.put(name, new Setter(name, method));
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158 }
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159
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160 /* ------------------------------------------------------------ */
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161 protected Setter getSetter(String name)
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162 {
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163 return _setters.get(name);
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164 }
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165
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166 /* ------------------------------------------------------------ */
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167 protected boolean includeField(String name, Method m)
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168 {
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169 return _excluded==null || !_excluded.contains(name);
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170 }
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171
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172 /* ------------------------------------------------------------ */
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173 protected int getExcludedCount()
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174 {
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175 return _excluded==null ? 0 : _excluded.size();
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176 }
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177
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178 /* ------------------------------------------------------------ */
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179 public Object fromJSON(Map object)
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180 {
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181 Object obj = null;
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182 try
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183 {
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184 obj = _pojoClass.newInstance();
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185 }
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186 catch(Exception e)
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187 {
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188 // TODO return Map instead?
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189 throw new RuntimeException(e);
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190 }
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191
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192 setProps(obj, object);
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193 return obj;
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194 }
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195
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196 /* ------------------------------------------------------------ */
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197 public int setProps(Object obj, Map<?,?> props)
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198 {
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199 int count = 0;
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200 for(Iterator<?> iterator = props.entrySet().iterator(); iterator.hasNext();)
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201 {
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202 Map.Entry<?, ?> entry = (Map.Entry<?,?>) iterator.next();
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203 Setter setter = getSetter((String)entry.getKey());
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204 if(setter!=null)
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205 {
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206 try
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207 {
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208 setter.invoke(obj, entry.getValue());
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209 count++;
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210 }
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211 catch(Exception e)
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212 {
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213 // TODO throw exception?
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214 LOG.warn(_pojoClass.getName()+"#"+setter.getPropertyName()+" not set from "+
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215 (entry.getValue().getClass().getName())+"="+entry.getValue().toString());
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216 log(e);
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217 }
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218 }
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219 }
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220 return count;
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221 }
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222
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223 /* ------------------------------------------------------------ */
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224 public void toJSON(Object obj, Output out)
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225 {
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226 if(_fromJSON)
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227 out.addClass(_pojoClass);
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228 for(Map.Entry<String,Method> entry : _getters.entrySet())
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229 {
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230 try
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231 {
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232 out.add(entry.getKey(), entry.getValue().invoke(obj, GETTER_ARG));
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233 }
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234 catch(Exception e)
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235 {
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236 // TODO throw exception?
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237 LOG.warn("{} property '{}' excluded. (errors)", _pojoClass.getName(),
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238 entry.getKey());
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239 log(e);
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240 }
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241 }
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242 }
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243
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244 /* ------------------------------------------------------------ */
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245 protected void log(Throwable t)
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246 {
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247 LOG.ignore(t);
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248 }
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249
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250 /* ------------------------------------------------------------ */
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251 public static class Setter
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252 {
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253 protected String _propertyName;
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254 protected Method _setter;
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255 protected NumberType _numberType;
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256 protected Class<?> _type;
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257 protected Class<?> _componentType;
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258
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259 public Setter(String propertyName, Method method)
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260 {
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261 _propertyName = propertyName;
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262 _setter = method;
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263 _type = method.getParameterTypes()[0];
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264 _numberType = __numberTypes.get(_type);
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265 if(_numberType==null && _type.isArray())
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266 {
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267 _componentType = _type.getComponentType();
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268 _numberType = __numberTypes.get(_componentType);
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269 }
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270 }
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271
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272 public String getPropertyName()
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273 {
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274 return _propertyName;
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275 }
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276
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277 public Method getMethod()
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278 {
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279 return _setter;
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280 }
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281
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282 public NumberType getNumberType()
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283 {
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284 return _numberType;
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285 }
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286
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287 public Class<?> getType()
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288 {
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289 return _type;
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290 }
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291
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292 public Class<?> getComponentType()
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293 {
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294 return _componentType;
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295 }
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296
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297 public boolean isPropertyNumber()
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298 {
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299 return _numberType!=null;
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300 }
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301
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302 public void invoke(Object obj, Object value) throws IllegalArgumentException,
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303 IllegalAccessException, InvocationTargetException
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304 {
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305 if(value==null)
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306 _setter.invoke(obj, NULL_ARG);
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307 else
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308 invokeObject(obj, value);
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309 }
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310
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311 protected void invokeObject(Object obj, Object value) throws IllegalArgumentException,
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312 IllegalAccessException, InvocationTargetException
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313 {
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314
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315 if (_type.isEnum())
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316 {
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317 if (value instanceof Enum)
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318 _setter.invoke(obj, new Object[]{value});
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319 else
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320 _setter.invoke(obj, new Object[]{Enum.valueOf((Class<? extends Enum>)_type,value.toString())});
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321 }
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322 else if(_numberType!=null && value instanceof Number)
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323 {
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324 _setter.invoke(obj, new Object[]{_numberType.getActualValue((Number)value)});
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325 }
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326 else if (Character.TYPE.equals(_type) || Character.class.equals(_type))
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327 {
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328 _setter.invoke(obj, new Object[]{String.valueOf(value).charAt(0)});
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329 }
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330 else if(_componentType!=null && value.getClass().isArray())
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331 {
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332 if(_numberType==null)
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333 {
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334 int len = Array.getLength(value);
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335 Object array = Array.newInstance(_componentType, len);
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336 try
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337 {
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338 System.arraycopy(value, 0, array, 0, len);
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339 }
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340 catch(Exception e)
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341 {
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342 // unusual array with multiple types
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343 LOG.ignore(e);
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344 _setter.invoke(obj, new Object[]{value});
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345 return;
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346 }
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347 _setter.invoke(obj, new Object[]{array});
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348 }
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349 else
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350 {
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351 Object[] old = (Object[])value;
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352 Object array = Array.newInstance(_componentType, old.length);
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353 try
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354 {
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355 for(int i=0; i<old.length; i++)
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356 Array.set(array, i, _numberType.getActualValue((Number)old[i]));
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357 }
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358 catch(Exception e)
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359 {
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360 // unusual array with multiple types
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361 LOG.ignore(e);
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362 _setter.invoke(obj, new Object[]{value});
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363 return;
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364 }
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365 _setter.invoke(obj, new Object[]{array});
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366 }
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367 }
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368 else
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369 _setter.invoke(obj, new Object[]{value});
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370 }
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371 }
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372
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373 public interface NumberType
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374 {
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375 public Object getActualValue(Number number);
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376 }
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377
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378 public static final NumberType SHORT = new NumberType()
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379 {
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380 public Object getActualValue(Number number)
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381 {
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382 return new Short(number.shortValue());
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383 }
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384 };
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385
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386 public static final NumberType INTEGER = new NumberType()
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387 {
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388 public Object getActualValue(Number number)
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389 {
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390 return new Integer(number.intValue());
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391 }
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392 };
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393
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394 public static final NumberType FLOAT = new NumberType()
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395 {
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396 public Object getActualValue(Number number)
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397 {
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diff changeset
398 return new Float(number.floatValue());
3428c60d7cfc replace jetty jars with source
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399 }
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diff changeset
400 };
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diff changeset
401
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parents:
diff changeset
402 public static final NumberType LONG = new NumberType()
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parents:
diff changeset
403 {
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diff changeset
404 public Object getActualValue(Number number)
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diff changeset
405 {
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diff changeset
406 return number instanceof Long ? number : new Long(number.longValue());
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parents:
diff changeset
407 }
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parents:
diff changeset
408 };
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parents:
diff changeset
409
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parents:
diff changeset
410 public static final NumberType DOUBLE = new NumberType()
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parents:
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411 {
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parents:
diff changeset
412 public Object getActualValue(Number number)
3428c60d7cfc replace jetty jars with source
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parents:
diff changeset
413 {
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diff changeset
414 return number instanceof Double ? number : new Double(number.doubleValue());
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parents:
diff changeset
415 }
3428c60d7cfc replace jetty jars with source
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parents:
diff changeset
416 };
3428c60d7cfc replace jetty jars with source
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parents:
diff changeset
417
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parents:
diff changeset
418 static
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419 {
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diff changeset
420 __numberTypes.put(Short.class, SHORT);
3428c60d7cfc replace jetty jars with source
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parents:
diff changeset
421 __numberTypes.put(Short.TYPE, SHORT);
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parents:
diff changeset
422 __numberTypes.put(Integer.class, INTEGER);
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parents:
diff changeset
423 __numberTypes.put(Integer.TYPE, INTEGER);
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parents:
diff changeset
424 __numberTypes.put(Long.class, LONG);
3428c60d7cfc replace jetty jars with source
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parents:
diff changeset
425 __numberTypes.put(Long.TYPE, LONG);
3428c60d7cfc replace jetty jars with source
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parents:
diff changeset
426 __numberTypes.put(Float.class, FLOAT);
3428c60d7cfc replace jetty jars with source
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parents:
diff changeset
427 __numberTypes.put(Float.TYPE, FLOAT);
3428c60d7cfc replace jetty jars with source
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parents:
diff changeset
428 __numberTypes.put(Double.class, DOUBLE);
3428c60d7cfc replace jetty jars with source
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parents:
diff changeset
429 __numberTypes.put(Double.TYPE, DOUBLE);
3428c60d7cfc replace jetty jars with source
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parents:
diff changeset
430 }
3428c60d7cfc replace jetty jars with source
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parents:
diff changeset
431 }