Mercurial > hg > blitz_stable
annotate src/com/go/trove/util/NullKeyMap.java @ 0:3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
author | Dan Creswell <dan.creswell@gmail.com> |
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date | Sat, 21 Mar 2009 11:00:06 +0000 |
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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.util.*; |
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56 import java.io.Serializable; |
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57 |
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58 /****************************************************************************** |
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59 * A Map supporting null keys that wraps a Map that doesn't support null keys. |
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60 * NullKeyMap substitutes null keys with a special placeholder object. This |
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61 * technique does not work when the wrapped Map is a TreeMap because it cannot |
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62 * be compared against other objects. In order for TreeMaps to support null |
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63 * keys, use any of the null ordering comparators found in the {@link Utils} |
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64 * class. |
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65 * |
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66 * @author Brian S O'Neill |
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67 * @version |
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68 * <!--$$Revision: 1.1 $-->, <!--$$JustDate:--> 9/07/00 <!-- $--> |
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69 */ |
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70 public class NullKeyMap extends AbstractMap implements Serializable { |
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71 // Instead of using null as a key, use this placeholder. |
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72 private static final Object NULL = new Serializable() {}; |
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73 |
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74 private Map mMap; |
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75 |
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76 private transient Set mKeySet; |
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77 private transient Set mEntrySet; |
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78 |
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79 /** |
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80 * @param map The map to wrap. |
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81 */ |
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82 public NullKeyMap(Map map) { |
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83 mMap = map; |
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84 } |
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85 |
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86 public int size() { |
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87 return mMap.size(); |
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88 } |
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89 |
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90 public boolean isEmpty() { |
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91 return mMap.isEmpty(); |
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92 } |
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93 |
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94 public boolean containsKey(Object key) { |
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95 return (key == null) ? mMap.containsKey(NULL) : mMap.containsKey(key); |
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96 } |
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97 |
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98 public boolean containsValue(Object value) { |
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99 return mMap.containsValue(value); |
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100 } |
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101 |
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102 public Object get(Object key) { |
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103 return (key == null) ? mMap.get(NULL) : mMap.get(key); |
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104 } |
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105 |
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106 public Object put(Object key, Object value) { |
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107 return mMap.put((key == null) ? NULL : key, value); |
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108 } |
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109 |
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110 public Object remove(Object key) { |
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111 return (key == null) ? mMap.remove(NULL) : mMap.remove(key); |
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112 } |
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113 |
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114 public void putAll(Map map) { |
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115 Iterator it = map.entrySet().iterator(); |
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116 while (it.hasNext()) { |
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117 Map.Entry entry = (Map.Entry)it.next(); |
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118 put(entry.getKey(), entry.getValue()); |
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119 } |
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120 } |
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121 |
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122 public void clear() { |
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123 mMap.clear(); |
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124 } |
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125 |
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126 public Set keySet() { |
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127 if (mKeySet == null) { |
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128 mKeySet = new AbstractSet() { |
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129 public Iterator iterator() { |
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130 final Iterator it = mMap.keySet().iterator(); |
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131 |
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132 return new Iterator() { |
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133 public boolean hasNext() { |
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134 return it.hasNext(); |
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135 } |
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136 |
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137 public Object next() { |
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138 Object key = it.next(); |
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139 return (key == NULL) ? null : key; |
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140 } |
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141 |
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142 public void remove() { |
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143 it.remove(); |
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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 boolean contains(Object key) { |
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149 return containsKey((key == null) ? NULL : key); |
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150 } |
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151 |
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152 public boolean remove(Object key) { |
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153 if (key == null) { |
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154 key = NULL; |
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155 } |
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156 if (containsKey(key)) { |
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157 NullKeyMap.this.remove(key); |
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158 return true; |
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159 } |
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160 else { |
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161 return false; |
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162 } |
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163 } |
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164 |
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165 public int size() { |
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166 return NullKeyMap.this.size(); |
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167 } |
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168 |
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169 public void clear() { |
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170 NullKeyMap.this.clear(); |
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171 } |
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172 }; |
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173 } |
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174 |
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175 return mKeySet; |
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176 } |
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177 |
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178 public Collection values() { |
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179 return mMap.values(); |
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180 } |
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181 |
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182 public Set entrySet() { |
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183 if (mEntrySet == null) { |
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184 mEntrySet = new AbstractSet() { |
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185 public Iterator iterator() { |
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186 final Iterator it = mMap.entrySet().iterator(); |
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187 |
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188 return new Iterator() { |
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189 public boolean hasNext() { |
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190 return it.hasNext(); |
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191 } |
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192 |
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193 public Object next() { |
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194 final Map.Entry entry = (Map.Entry)it.next(); |
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195 if (entry.getKey() == NULL) { |
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196 return new AbstractMapEntry() { |
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197 public Object getKey() { |
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198 return null; |
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199 } |
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200 |
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201 public Object getValue() { |
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202 return entry.getValue(); |
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203 } |
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204 |
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205 public Object setValue(Object value) { |
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206 return entry.setValue(value); |
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207 } |
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208 }; |
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209 } |
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210 else { |
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211 return entry; |
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212 } |
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213 } |
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214 |
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215 public void remove() { |
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216 it.remove(); |
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217 } |
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218 }; |
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219 } |
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220 |
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221 public boolean contains(Object obj) { |
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222 if (!(obj instanceof Map.Entry)) { |
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223 return false; |
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224 } |
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225 Map.Entry entry = (Map.Entry)obj; |
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226 Object key = entry.getKey(); |
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227 Object value = entry.getValue(); |
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228 if (key == null) { |
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229 key = NULL; |
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230 } |
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231 Object lookup = get(key); |
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232 if (lookup == null) { |
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233 return value == null; |
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234 } |
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235 else { |
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236 return lookup.equals(value); |
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237 } |
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238 } |
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239 |
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240 public boolean remove(Object obj) { |
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241 if (!(obj instanceof Map.Entry)) { |
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242 return false; |
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243 } |
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244 Map.Entry entry = ((Map.Entry)obj); |
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245 Object key = entry.getKey(); |
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246 if (key == null) { |
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247 key = NULL; |
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248 } |
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249 if (containsKey(key)) { |
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250 NullKeyMap.this.remove(key); |
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251 return true; |
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252 } |
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253 else { |
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254 return false; |
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255 } |
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256 } |
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257 |
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258 public int size() { |
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259 return NullKeyMap.this.size(); |
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260 } |
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261 |
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262 public void clear() { |
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263 NullKeyMap.this.clear(); |
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264 } |
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265 }; |
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266 } |
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267 |
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268 return mEntrySet; |
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269 } |
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270 } |