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annotate src/org/eclipse/jetty/util/MultiMap.java @ 848:22a4e93ed20e

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author Franklin Schmidt <fschmidt@gmail.com>
date Mon, 19 Sep 2016 16:38:36 -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;
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20
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21 import java.io.Serializable;
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22 import java.util.Arrays;
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23 import java.util.Collection;
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24 import java.util.HashMap;
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25 import java.util.List;
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26 import java.util.Map;
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27 import java.util.Set;
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28 import java.util.concurrent.ConcurrentHashMap;
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29 import java.util.concurrent.ConcurrentMap;
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30
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31 /* ------------------------------------------------------------ */
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32 /** A multi valued Map.
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33 * This Map specializes HashMap and provides methods
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34 * that operate on multi valued items.
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35 * <P>
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36 * Implemented as a map of LazyList values
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37 * @param <K> The key type of the map.
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38 *
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39 * @see LazyList
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40 *
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41 */
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42 public class MultiMap<K> implements ConcurrentMap<K,Object>, Serializable
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43 {
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44 private static final long serialVersionUID = -6878723138353851005L;
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45 Map<K,Object> _map;
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46 ConcurrentMap<K, Object> _cmap;
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47
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48 public MultiMap()
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49 {
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50 _map=new HashMap<K, Object>();
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51 }
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52
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53 public MultiMap(Map<K,Object> map)
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54 {
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55 if (map instanceof ConcurrentMap)
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56 _map=_cmap=new ConcurrentHashMap<K, Object>(map);
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57 else
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58 _map=new HashMap<K, Object>(map);
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59 }
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60
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61 public MultiMap(MultiMap<K> map)
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62 {
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63 if (map._cmap!=null)
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64 _map=_cmap=new ConcurrentHashMap<K, Object>(map._cmap);
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65 else
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66 _map=new HashMap<K,Object>(map._map);
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67 }
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68
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69 public MultiMap(int capacity)
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70 {
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71 _map=new HashMap<K, Object>(capacity);
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72 }
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73
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74 public MultiMap(boolean concurrent)
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75 {
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76 if (concurrent)
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77 _map=_cmap=new ConcurrentHashMap<K, Object>();
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78 else
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79 _map=new HashMap<K, Object>();
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80 }
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81
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82
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83 /* ------------------------------------------------------------ */
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84 /** Get multiple values.
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85 * Single valued entries are converted to singleton lists.
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86 * @param name The entry key.
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87 * @return Unmodifieable List of values.
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88 */
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89 public List getValues(Object name)
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90 {
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91 return LazyList.getList(_map.get(name),true);
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92 }
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93
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94 /* ------------------------------------------------------------ */
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95 /** Get a value from a multiple value.
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96 * If the value is not a multivalue, then index 0 retrieves the
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97 * value or null.
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98 * @param name The entry key.
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99 * @param i Index of element to get.
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100 * @return Unmodifieable List of values.
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101 */
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102 public Object getValue(Object name,int i)
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103 {
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104 Object l=_map.get(name);
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105 if (i==0 && LazyList.size(l)==0)
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106 return null;
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107 return LazyList.get(l,i);
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108 }
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109
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110
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111 /* ------------------------------------------------------------ */
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112 /** Get value as String.
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113 * Single valued items are converted to a String with the toString()
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114 * Object method. Multi valued entries are converted to a comma separated
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115 * List. No quoting of commas within values is performed.
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116 * @param name The entry key.
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117 * @return String value.
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118 */
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119 public String getString(Object name)
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120 {
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121 Object l=_map.get(name);
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122 switch(LazyList.size(l))
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123 {
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124 case 0:
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125 return null;
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126 case 1:
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127 Object o=LazyList.get(l,0);
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128 return o==null?null:o.toString();
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129 default:
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130 {
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131 StringBuilder values=new StringBuilder(128);
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132 for (int i=0; i<LazyList.size(l); i++)
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133 {
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134 Object e=LazyList.get(l,i);
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135 if (e!=null)
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136 {
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137 if (values.length()>0)
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138 values.append(',');
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139 values.append(e.toString());
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140 }
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141 }
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142 return values.toString();
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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 public Object get(Object name)
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149 {
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150 Object l=_map.get(name);
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151 switch(LazyList.size(l))
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152 {
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153 case 0:
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154 return null;
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155 case 1:
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156 Object o=LazyList.get(l,0);
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157 return o;
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158 default:
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159 return LazyList.getList(l,true);
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160 }
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161 }
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162
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163 /* ------------------------------------------------------------ */
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164 /** Put and entry into the map.
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165 * @param name The entry key.
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166 * @param value The entry value.
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167 * @return The previous value or null.
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168 */
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169 public Object put(K name, Object value)
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170 {
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171 return _map.put(name,LazyList.add(null,value));
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172 }
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173
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174 /* ------------------------------------------------------------ */
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175 /** Put multi valued entry.
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176 * @param name The entry key.
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177 * @param values The List of multiple values.
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178 * @return The previous value or null.
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179 */
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180 public Object putValues(K name, List<? extends Object> values)
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181 {
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182 return _map.put(name,values);
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183 }
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184
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185 /* ------------------------------------------------------------ */
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186 /** Put multi valued entry.
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187 * @param name The entry key.
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188 * @param values The String array of multiple values.
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189 * @return The previous value or null.
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190 */
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191 public Object putValues(K name, String... values)
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192 {
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193 Object list=null;
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194 for (int i=0;i<values.length;i++)
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195 list=LazyList.add(list,values[i]);
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196 return _map.put(name,list);
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197 }
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198
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199
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200 /* ------------------------------------------------------------ */
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201 /** Add value to multi valued entry.
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202 * If the entry is single valued, it is converted to the first
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203 * value of a multi valued entry.
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204 * @param name The entry key.
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205 * @param value The entry value.
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206 */
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207 public void add(K name, Object value)
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208 {
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209 Object lo = _map.get(name);
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210 Object ln = LazyList.add(lo,value);
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211 if (lo!=ln)
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212 _map.put(name,ln);
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213 }
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214
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215 /* ------------------------------------------------------------ */
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216 /** Add values to multi valued entry.
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217 * If the entry is single valued, it is converted to the first
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218 * value of a multi valued entry.
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219 * @param name The entry key.
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220 * @param values The List of multiple values.
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221 */
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222 public void addValues(K name, List<? extends Object> values)
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223 {
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224 Object lo = _map.get(name);
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225 Object ln = LazyList.addCollection(lo,values);
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226 if (lo!=ln)
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227 _map.put(name,ln);
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228 }
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229
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230 /* ------------------------------------------------------------ */
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231 /** Add values to multi valued entry.
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232 * If the entry is single valued, it is converted to the first
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233 * value of a multi valued entry.
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234 * @param name The entry key.
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235 * @param values The String array of multiple values.
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236 */
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237 public void addValues(K name, String[] values)
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238 {
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239 Object lo = _map.get(name);
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240 Object ln = LazyList.addCollection(lo,Arrays.asList(values));
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241 if (lo!=ln)
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242 _map.put(name,ln);
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243 }
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244
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245 /* ------------------------------------------------------------ */
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246 /** Remove value.
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247 * @param name The entry key.
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248 * @param value The entry value.
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249 * @return true if it was removed.
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250 */
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251 public boolean removeValue(K name,Object value)
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252 {
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253 Object lo = _map.get(name);
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254 Object ln=lo;
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255 int s=LazyList.size(lo);
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256 if (s>0)
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257 {
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258 ln=LazyList.remove(lo,value);
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259 if (ln==null)
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260 _map.remove(name);
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261 else
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262 _map.put(name, ln);
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263 }
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264 return LazyList.size(ln)!=s;
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265 }
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266
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267
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268 /* ------------------------------------------------------------ */
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269 /** Put all contents of map.
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270 * @param m Map
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271 */
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272 public void putAll(Map<? extends K, ? extends Object> m)
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273 {
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274 boolean multi = (m instanceof MultiMap);
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275
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276 if (multi)
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277 {
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278 for (Map.Entry<? extends K, ? extends Object> entry : m.entrySet())
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279 {
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280 _map.put(entry.getKey(),LazyList.clone(entry.getValue()));
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281 }
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282 }
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283 else
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284 {
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285 _map.putAll(m);
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286 }
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287 }
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288
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289 /* ------------------------------------------------------------ */
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290 /**
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291 * @return Map of String arrays
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292 */
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293 public Map<K,String[]> toStringArrayMap()
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294 {
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295 HashMap<K,String[]> map = new HashMap<K,String[]>(_map.size()*3/2)
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296 {
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297 public String toString()
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298 {
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299 StringBuilder b=new StringBuilder();
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300 b.append('{');
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301 for (K k:keySet())
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302 {
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303 if(b.length()>1)
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304 b.append(',');
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305 b.append(k);
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306 b.append('=');
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307 b.append(Arrays.asList(get(k)));
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308 }
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309
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310 b.append('}');
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311 return b.toString();
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312 }
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313 };
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314
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315 for(Map.Entry<K,Object> entry: _map.entrySet())
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316 {
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317 String[] a = LazyList.toStringArray(entry.getValue());
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318 map.put(entry.getKey(),a);
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319 }
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320 return map;
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321 }
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322
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323 @Override
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324 public String toString()
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325 {
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326 return _cmap==null?_map.toString():_cmap.toString();
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327 }
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328
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329 public void clear()
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330 {
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331 _map.clear();
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332 }
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333
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334 public boolean containsKey(Object key)
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335 {
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336 return _map.containsKey(key);
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337 }
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338
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339 public boolean containsValue(Object value)
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340 {
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341 return _map.containsValue(value);
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342 }
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343
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344 public Set<Entry<K, Object>> entrySet()
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345 {
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346 return _map.entrySet();
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347 }
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348
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349 @Override
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350 public boolean equals(Object o)
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351 {
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352 return _map.equals(o);
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353 }
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354
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355 @Override
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356 public int hashCode()
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357 {
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358 return _map.hashCode();
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359 }
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360
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361 public boolean isEmpty()
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362 {
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363 return _map.isEmpty();
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364 }
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365
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366 public Set<K> keySet()
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367 {
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368 return _map.keySet();
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369 }
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370
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371 public Object remove(Object key)
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372 {
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373 return _map.remove(key);
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374 }
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375
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376 public int size()
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377 {
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378 return _map.size();
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379 }
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380
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381 public Collection<Object> values()
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382 {
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383 return _map.values();
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384 }
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385
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386
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387
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388 public Object putIfAbsent(K key, Object value)
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389 {
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390 if (_cmap==null)
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391 throw new UnsupportedOperationException();
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392 return _cmap.putIfAbsent(key,value);
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393 }
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394
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395 public boolean remove(Object key, Object value)
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396 {
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397 if (_cmap==null)
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398 throw new UnsupportedOperationException();
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399 return _cmap.remove(key,value);
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400 }
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401
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402 public boolean replace(K key, Object oldValue, Object newValue)
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403 {
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404 if (_cmap==null)
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405 throw new UnsupportedOperationException();
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406 return _cmap.replace(key,oldValue,newValue);
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407 }
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408
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409 public Object replace(K key, Object value)
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410 {
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411 if (_cmap==null)
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412 throw new UnsupportedOperationException();
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413 return _cmap.replace(key,value);
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414 }
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415 }