Mercurial > projects > dwt2
annotate org.eclipse.core.jobs/src/org/eclipse/core/internal/jobs/ObjectMap.d @ 12:bc29606a740c
Added dwt-addons in original directory structure of eclipse.org
author | Frank Benoit <benoit@tionex.de> |
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date | Sat, 14 Mar 2009 18:23:29 +0100 |
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1 /******************************************************************************* |
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2 * Copyright (c) 2000, 2006 IBM Corporation and others. |
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3 * All rights reserved. This program and the accompanying materials |
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4 * are made available under the terms of the Eclipse Public License v1.0 |
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5 * which accompanies this distribution, and is available at |
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6 * http://www.eclipse.org/legal/epl-v10.html |
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7 * |
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8 * Contributors: |
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9 * IBM Corporation - initial API and implementation |
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10 * Port to the D programming language: |
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11 * Frank Benoit <benoit@tionex.de> |
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12 *******************************************************************************/ |
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13 module org.eclipse.core.internal.jobs.ObjectMap; |
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14 |
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15 import java.lang.all; |
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16 import java.util.Collections; |
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17 import java.util.Collection; |
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18 import java.util.Iterator; |
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19 import java.util.Map; |
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20 import java.util.HashMap; |
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21 import java.util.Set; |
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22 import java.util.HashSet; |
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23 import org.eclipse.core.internal.jobs.StringPool; |
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24 |
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25 /** |
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26 * A specialized map implementation that is optimized for a small set of object |
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27 * keys. |
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28 * |
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29 * Implemented as a single array that alternates keys and values. |
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30 * |
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31 * Note: This class is copied from org.eclipse.core.resources |
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32 */ |
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33 public class ObjectMap : Map { |
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34 // 8 attribute keys, 8 attribute values |
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35 protected static const int DEFAULT_SIZE = 16; |
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36 protected static const int GROW_SIZE = 10; |
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37 protected int count = 0; |
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38 protected Object[] elements = null; |
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39 |
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40 /** |
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41 * Creates a new object map. |
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42 * |
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43 * @param initialCapacity |
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44 * The initial number of elements that will fit in the map. |
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45 */ |
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46 public this(int initialCapacity) { |
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47 if (initialCapacity > 0) |
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48 elements = new Object[Math.max(initialCapacity * 2, 0)]; |
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49 } |
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50 |
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51 /** |
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52 * Creates a new object map of the same size as the given map and populate |
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53 * it with the key/attribute pairs found in the map. |
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54 * |
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55 * @param map |
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56 * The entries in the given map will be added to the new map. |
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57 */ |
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58 public this(Map map) { |
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59 this(map.size()); |
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60 putAll(map); |
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61 } |
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62 |
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63 /** |
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64 * @see Map#clear() |
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65 */ |
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66 public void clear() { |
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67 elements = null; |
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68 count = 0; |
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69 } |
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70 |
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71 /** |
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72 * @see java.lang.Object#clone() |
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73 */ |
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74 public Object clone() { |
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75 return new ObjectMap(this); |
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76 } |
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77 |
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78 /** |
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79 * @see Map#containsKey(java.lang.Object) |
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80 */ |
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81 public bool containsKey(Object key) { |
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82 if (elements is null || count is 0) |
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83 return false; |
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84 for (int i = 0; i < elements.length; i = i + 2) |
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85 if (elements[i] !is null && elements[i].opEquals(key)) |
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86 return true; |
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87 return false; |
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88 } |
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89 public bool containsKey(String key) { |
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90 return containsKey(stringcast(key)); |
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91 } |
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92 /** |
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93 * @see Map#containsValue(java.lang.Object) |
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94 */ |
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95 public bool containsValue(Object value) { |
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96 if (elements is null || count is 0) |
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97 return false; |
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98 for (int i = 1; i < elements.length; i = i + 2) |
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99 if (elements[i] !is null && elements[i].opEquals(value)) |
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100 return true; |
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101 return false; |
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102 } |
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103 |
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104 /** |
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105 * @see Map#entrySet() |
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106 * |
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107 * Note: This implementation does not conform properly to the |
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108 * specification in the Map interface. The returned collection will not |
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109 * be bound to this map and will not remain in sync with this map. |
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110 */ |
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111 public Set entrySet() { |
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112 return count is 0 ? Collections.EMPTY_SET : toHashMap().entrySet(); |
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113 } |
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114 |
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115 /** |
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116 * @see Object#equals(java.lang.Object) |
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117 */ |
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118 public override int opEquals(Object o) { |
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119 if (!(cast(Map)o )) |
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120 return false; |
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121 Map other = cast(Map) o; |
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122 //must be same size |
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123 if (count !is other.size()) |
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124 return false; |
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125 //keysets must be equal |
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126 if (!(cast(Object)keySet()).opEquals(cast(Object)other.keySet())) |
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127 return false; |
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128 //values for each key must be equal |
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129 for (int i = 0; i < elements.length; i = i + 2) { |
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130 if (elements[i] !is null && (!elements[i + 1].opEquals(other.get(elements[i])))) |
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131 return false; |
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132 } |
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133 return true; |
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134 } |
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135 |
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136 /** |
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137 * @see Map#get(java.lang.Object) |
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138 */ |
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139 public Object get(Object key) { |
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140 if (elements is null || count is 0) |
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141 return null; |
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142 for (int i = 0; i < elements.length; i = i + 2) |
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143 if (elements[i] !is null && elements[i].opEquals(key)) |
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144 return elements[i + 1]; |
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145 return null; |
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146 } |
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147 public Object get(String key) { |
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148 return get(stringcast(key)); |
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149 } |
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150 |
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151 /** |
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152 * The capacity of the map has been exceeded, grow the array by GROW_SIZE to |
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153 * accomodate more entries. |
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154 */ |
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155 protected void grow() { |
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156 Object[] expanded = new Object[elements.length + GROW_SIZE]; |
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157 System.arraycopy(elements, 0, expanded, 0, elements.length); |
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158 elements = expanded; |
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159 } |
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160 |
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161 /** |
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162 * @see Object#hashCode() |
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163 */ |
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164 public override hash_t toHash() { |
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165 int hash = 0; |
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166 for (int i = 0; i < elements.length; i = i + 2) { |
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167 if (elements[i] !is null) { |
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168 hash += elements[i].toHash(); |
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169 } |
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170 } |
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171 return hash; |
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172 } |
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173 |
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174 /** |
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175 * @see Map#isEmpty() |
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176 */ |
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177 public bool isEmpty() { |
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178 return count is 0; |
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179 } |
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180 |
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181 /** |
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182 * Returns all keys in this table as an array. |
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183 */ |
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184 public String[] keys() { |
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185 String[] result = new String[count]; |
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186 int next = 0; |
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187 for (int i = 0; i < elements.length; i = i + 2) |
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188 if (elements[i] !is null) |
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189 result[next++] = stringcast( elements[i] ); |
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190 return result; |
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191 } |
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192 |
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193 /** |
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194 * @see Map#keySet() |
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195 * |
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196 * Note: This implementation does not conform properly to the |
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197 * specification in the Map interface. The returned collection will not |
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198 * be bound to this map and will not remain in sync with this map. |
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199 */ |
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200 public Set keySet() { |
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201 Set result = new HashSet(size()); |
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202 for (int i = 0; i < elements.length; i = i + 2) { |
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203 if (elements[i] !is null) { |
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204 result.add(elements[i]); |
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205 } |
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206 } |
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207 return result; |
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208 } |
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209 |
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210 /** |
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211 * @see Map#put(java.lang.Object, java.lang.Object) |
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212 */ |
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213 public Object put(Object key, Object value) { |
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214 if (key is null) |
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215 throw new NullPointerException(); |
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216 if (value is null) |
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217 return remove(key); |
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218 |
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219 // handle the case where we don't have any attributes yet |
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220 if (elements is null) |
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221 elements = new Object[DEFAULT_SIZE]; |
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222 if (count is 0) { |
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223 elements[0] = key; |
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224 elements[1] = value; |
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225 count++; |
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226 return null; |
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227 } |
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228 |
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229 int emptyIndex = -1; |
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230 // replace existing value if it exists |
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231 for (int i = 0; i < elements.length; i += 2) { |
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232 if (elements[i] !is null) { |
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233 if (elements[i].opEquals(key)) { |
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234 Object oldValue = elements[i + 1]; |
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235 elements[i + 1] = value; |
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236 return oldValue; |
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237 } |
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238 } else if (emptyIndex is -1) { |
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239 // keep track of the first empty index |
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240 emptyIndex = i; |
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241 } |
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242 } |
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243 // this will put the emptyIndex greater than the size but |
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244 // that's ok because we will grow first. |
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245 if (emptyIndex is -1) |
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246 emptyIndex = count * 2; |
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247 |
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248 // otherwise add it to the list of elements. |
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249 // grow if necessary |
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250 if (elements.length <= (count * 2)) |
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251 grow(); |
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252 elements[emptyIndex] = key; |
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253 elements[emptyIndex + 1] = value; |
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254 count++; |
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255 return null; |
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256 } |
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257 public Object put(String key, Object value) { |
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258 return put( stringcast(key), value ); |
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259 } |
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260 public Object put(Object key, String value) { |
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261 return put( key, stringcast(value) ); |
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262 } |
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263 public Object put(String key, String value) { |
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264 return put( stringcast(key), stringcast(value) ); |
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265 } |
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266 |
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267 /** |
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268 * @see Map#putAll(java.util.Map) |
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269 */ |
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270 public void putAll(Map map) { |
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271 for (Iterator i = map.keySet().iterator(); i.hasNext();) { |
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272 Object key = i.next(); |
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273 Object value = map.get(key); |
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274 put(key, value); |
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275 } |
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276 } |
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277 |
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278 /** |
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279 * @see Map#remove(java.lang.Object) |
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280 */ |
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281 public Object remove(Object key) { |
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282 if (elements is null || count is 0) |
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283 return null; |
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284 for (int i = 0; i < elements.length; i = i + 2) { |
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285 if (elements[i] !is null && elements[i].opEquals(key)) { |
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286 elements[i] = null; |
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287 Object result = elements[i + 1]; |
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288 elements[i + 1] = null; |
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289 count--; |
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290 return result; |
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291 } |
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292 } |
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293 return null; |
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294 } |
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295 public Object remove(String key) { |
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296 return remove( stringcast(key)); |
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297 } |
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298 |
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299 /* (non-Javadoc |
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300 * Method declared on IStringPoolParticipant |
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301 */ |
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302 public void shareStrings(StringPool set) { |
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303 //copy elements for thread safety |
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304 Object[] array = elements; |
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305 if (array is null) |
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306 return; |
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307 for (int i = 0; i < array.length; i++) { |
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308 Object o = array[i]; |
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309 if (cast(ArrayWrapperString)o ) |
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310 array[i] = stringcast(set.add(stringcast( o))); |
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311 } |
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312 } |
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313 |
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314 /** |
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315 * @see Map#size() |
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316 */ |
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317 public int size() { |
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318 return count; |
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319 } |
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320 |
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321 /** |
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322 * Creates a new hash map with the same contents as this map. |
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323 */ |
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324 private HashMap toHashMap() { |
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325 HashMap result = new HashMap(size()); |
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326 for (int i = 0; i < elements.length; i = i + 2) { |
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327 if (elements[i] !is null) { |
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328 result.put(elements[i], elements[i + 1]); |
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329 } |
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330 } |
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331 return result; |
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332 } |
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333 |
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334 /** |
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335 * @see Map#values() |
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336 * |
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337 * Note: This implementation does not conform properly to the |
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338 * specification in the Map interface. The returned collection will not |
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339 * be bound to this map and will not remain in sync with this map. |
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340 */ |
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341 public Collection values() { |
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342 Set result = new HashSet(size()); |
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343 for (int i = 1; i < elements.length; i = i + 2) { |
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344 if (elements[i] !is null) { |
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345 result.add(elements[i]); |
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346 } |
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347 } |
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348 return result; |
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349 } |
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350 |
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351 public int opApply (int delegate(ref Object value) dg){ |
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352 implMissing(__FILE__, __LINE__ ); |
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353 return 0; |
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354 } |
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355 public int opApply (int delegate(ref Object key, ref Object value) dg){ |
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356 implMissing(__FILE__, __LINE__ ); |
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357 return 0; |
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358 } |
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359 |
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360 } |