Mercurial > projects > dwt2
annotate org.eclipse.jface/src/org/eclipse/jface/viewers/CustomHashtable.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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children | 52184e4b815c |
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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 * Peter Shipton - original hashtable implementation |
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10 * Nick Edgar - added element comparer support |
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11 * Port to the D programming language: |
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12 * Frank Benoit <benoit@tionex.de> |
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13 *******************************************************************************/ |
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14 |
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15 module org.eclipse.jface.viewers.CustomHashtable; |
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16 |
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17 import org.eclipse.jface.viewers.IElementComparer; |
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18 // import java.util.Enumeration; |
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19 // import java.util.NoSuchElementException; |
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20 |
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21 import java.lang.all; |
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22 import java.util.Enumeration; |
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23 import tango.core.Exception; |
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24 static import tango.text.Text; |
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25 alias tango.text.Text.Text!(char) StringBuffer; |
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26 |
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27 /** |
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28 * CustomHashtable associates keys with values. Keys and values cannot be null. |
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29 * The size of the Hashtable is the number of key/value pairs it contains. |
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30 * The capacity is the number of key/value pairs the Hashtable can hold. |
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31 * The load factor is a float value which determines how full the Hashtable |
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32 * gets before expanding the capacity. If the load factor of the Hashtable |
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33 * is exceeded, the capacity is doubled. |
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34 * <p> |
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35 * CustomHashtable allows a custom comparator and hash code provider. |
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36 */ |
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37 /* package */final class CustomHashtable { |
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38 alias Object.toHash toHash; |
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39 |
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40 /** |
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41 * HashMapEntry is an internal class which is used to hold the entries of a Hashtable. |
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42 */ |
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43 private static class HashMapEntry { |
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44 Object key, value; |
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45 |
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46 HashMapEntry next; |
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47 |
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48 this(Object theKey, Object theValue) { |
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49 key = theKey; |
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50 value = theValue; |
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51 } |
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52 } |
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53 |
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54 private static final class EmptyEnumerator : Enumeration { |
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55 public bool hasMoreElements() { |
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56 return false; |
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57 } |
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58 |
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59 public Object nextElement() { |
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60 throw new NoSuchElementException(null); |
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61 } |
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62 } |
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63 |
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64 private class HashEnumerator : Enumeration { |
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65 bool key; |
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66 |
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67 int start; |
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68 |
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69 HashMapEntry entry; |
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70 |
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71 this(bool isKey) { |
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72 key = isKey; |
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73 start = firstSlot; |
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74 } |
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75 |
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76 public bool hasMoreElements() { |
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77 if (entry !is null) { |
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78 return true; |
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79 } |
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80 while (start <= lastSlot) { |
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81 if (elementData[start++] !is null) { |
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82 entry = elementData[start - 1]; |
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83 return true; |
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84 } |
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85 } |
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86 return false; |
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87 } |
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88 |
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89 public Object nextElement() { |
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90 if (hasMoreElements()) { |
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91 Object result = key ? entry.key : entry.value; |
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92 entry = entry.next; |
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93 return result; |
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94 } else { |
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95 throw new NoSuchElementException(null); |
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96 } |
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97 } |
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98 } |
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99 |
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100 /+transient+/ int elementCount; |
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101 |
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102 /+transient+/ HashMapEntry[] elementData; |
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103 |
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104 private float loadFactor; |
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105 |
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106 private int threshold; |
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107 |
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108 /+transient+/ int firstSlot = 0; |
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109 |
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110 /+transient+/ int lastSlot = -1; |
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111 |
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112 /+transient+/ private IElementComparer comparer; |
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113 |
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114 private static const EmptyEnumerator emptyEnumerator; |
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115 static this(){ |
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116 emptyEnumerator = new EmptyEnumerator(); |
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117 } |
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118 |
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119 /** |
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120 * The default capacity used when not specified in the constructor. |
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121 */ |
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122 public static const int DEFAULT_CAPACITY = 13; |
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123 |
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124 /** |
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125 * Constructs a new Hashtable using the default capacity |
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126 * and load factor. |
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127 */ |
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128 public this() { |
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129 this(13); |
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130 } |
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131 |
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132 /** |
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133 * Constructs a new Hashtable using the specified capacity |
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134 * and the default load factor. |
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135 * |
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136 * @param capacity the initial capacity |
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137 */ |
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138 public this(int capacity) { |
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139 this(capacity, null); |
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140 } |
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141 |
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142 /** |
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143 * Constructs a new hash table with the default capacity and the given |
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144 * element comparer. |
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145 * |
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146 * @param comparer the element comparer to use to compare keys and obtain |
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147 * hash codes for keys, or <code>null</code> to use the normal |
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148 * <code>equals</code> and <code>hashCode</code> methods |
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149 */ |
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150 public this(IElementComparer comparer) { |
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151 this(DEFAULT_CAPACITY, comparer); |
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152 } |
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153 |
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154 /** |
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155 * Constructs a new hash table with the given capacity and the given |
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156 * element comparer. |
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157 * |
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158 * @param capacity the maximum number of elements that can be added without |
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159 * rehashing |
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160 * @param comparer the element comparer to use to compare keys and obtain |
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161 * hash codes for keys, or <code>null</code> to use the normal |
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162 * <code>equals</code> and <code>hashCode</code> methods |
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163 */ |
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164 public this(int capacity, IElementComparer comparer) { |
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165 if (capacity >= 0) { |
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166 elementCount = 0; |
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167 elementData = new HashMapEntry[capacity is 0 ? 1 : capacity]; |
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168 firstSlot = elementData.length; |
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169 loadFactor = 0.75f; |
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170 computeMaxSize(); |
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171 } else { |
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172 throw new IllegalArgumentException(null); |
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173 } |
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174 this.comparer = comparer; |
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175 } |
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176 |
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177 /** |
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178 * Constructs a new hash table with enough capacity to hold all keys in the |
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179 * given hash table, then adds all key/value pairs in the given hash table |
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180 * to the new one, using the given element comparer. |
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181 * @param table the original hash table to copy from |
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182 * |
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183 * @param comparer the element comparer to use to compare keys and obtain |
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184 * hash codes for keys, or <code>null</code> to use the normal |
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185 * <code>equals</code> and <code>hashCode</code> methods |
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186 */ |
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187 public this(CustomHashtable table, IElementComparer comparer) { |
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188 this(table.size() * 2, comparer); |
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189 for (int i = table.elementData.length; --i >= 0;) { |
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190 HashMapEntry entry = table.elementData[i]; |
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191 while (entry !is null) { |
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192 put(entry.key, entry.value); |
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193 entry = entry.next; |
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194 } |
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195 } |
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196 } |
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197 |
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198 /** |
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199 * Returns the element comparer used to compare keys and to obtain |
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200 * hash codes for keys, or <code>null</code> if no comparer has been |
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201 * provided. |
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202 * |
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203 * @return the element comparer or <code>null</code> |
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204 * |
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205 * @since 3.2 |
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206 */ |
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207 public IElementComparer getComparer() { |
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208 return comparer; |
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209 } |
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210 |
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211 private void computeMaxSize() { |
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212 threshold = cast(int) (elementData.length * loadFactor); |
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213 } |
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214 |
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215 /** |
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216 * Answers if this Hashtable contains the specified object as a key |
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217 * of one of the key/value pairs. |
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218 * |
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219 * @param key the object to look for as a key in this Hashtable |
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220 * @return true if object is a key in this Hashtable, false otherwise |
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221 */ |
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222 public bool containsKey(Object key) { |
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223 return getEntry(key) !is null; |
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224 } |
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225 |
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226 /** |
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227 * Answers an Enumeration on the values of this Hashtable. The |
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228 * results of the Enumeration may be affected if the contents |
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229 * of this Hashtable are modified. |
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230 * |
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231 * @return an Enumeration of the values of this Hashtable |
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232 */ |
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233 public Enumeration elements() { |
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234 if (elementCount is 0) { |
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235 return emptyEnumerator; |
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236 } |
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237 return new HashEnumerator(false); |
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238 } |
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239 |
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240 /** |
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241 * Answers the value associated with the specified key in |
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242 * this Hashtable. |
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243 * |
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244 * @param key the key of the value returned |
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245 * @return the value associated with the specified key, null if the specified key |
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246 * does not exist |
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247 */ |
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248 public Object get(Object key) { |
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249 int index = (toHash(key) & 0x7FFFFFFF) % elementData.length; |
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250 HashMapEntry entry = elementData[index]; |
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251 while (entry !is null) { |
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252 if (keyEquals(key, entry.key)) { |
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253 return entry.value; |
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254 } |
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255 entry = entry.next; |
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256 } |
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257 return null; |
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258 } |
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259 |
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260 private HashMapEntry getEntry(Object key) { |
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261 int index = (toHash(key) & 0x7FFFFFFF) % elementData.length; |
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262 HashMapEntry entry = elementData[index]; |
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263 while (entry !is null) { |
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264 if (keyEquals(key, entry.key)) { |
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265 return entry; |
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266 } |
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267 entry = entry.next; |
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268 } |
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269 return null; |
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270 } |
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271 |
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272 /** |
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273 * Answers the hash code for the given key. |
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274 */ |
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275 private hash_t toHash(Object key) { |
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276 if (comparer is null) { |
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277 return key.toHash(); |
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278 } else { |
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279 return comparer.toHash(key); |
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280 } |
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281 } |
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282 |
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283 /** |
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284 * Compares two keys for equality. |
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285 */ |
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286 private bool keyEquals(Object a, Object b) { |
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287 if (comparer is null) { |
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288 return a.opEquals(b) !is 0; |
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289 } else { |
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290 return comparer.opEquals(a, b) !is 0; |
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291 } |
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292 } |
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293 |
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294 /** |
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295 * Answers an Enumeration on the keys of this Hashtable. The |
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296 * results of the Enumeration may be affected if the contents |
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297 * of this Hashtable are modified. |
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298 * |
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299 * @return an Enumeration of the keys of this Hashtable |
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300 */ |
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301 public Enumeration keys() { |
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302 if (elementCount is 0) { |
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303 return emptyEnumerator; |
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304 } |
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305 return new HashEnumerator(true); |
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306 } |
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307 |
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308 /** |
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309 * Associate the specified value with the specified key in this Hashtable. |
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310 * If the key already exists, the old value is replaced. The key and value |
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311 * cannot be null. |
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312 * |
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313 * @param key the key to add |
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314 * @param value the value to add |
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315 * @return the old value associated with the specified key, null if the key did |
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316 * not exist |
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317 */ |
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318 public Object put(Object key, Object value) { |
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319 if (key !is null && value !is null) { |
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320 int index = (toHash(key) & 0x7FFFFFFF) % elementData.length; |
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321 HashMapEntry entry = elementData[index]; |
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322 while (entry !is null && !keyEquals(key, entry.key)) { |
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323 entry = entry.next; |
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324 } |
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325 if (entry is null) { |
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326 if (++elementCount > threshold) { |
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327 rehash(); |
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328 index = (toHash(key) & 0x7FFFFFFF) % elementData.length; |
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329 } |
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330 if (index < firstSlot) { |
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331 firstSlot = index; |
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332 } |
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333 if (index > lastSlot) { |
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334 lastSlot = index; |
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335 } |
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336 entry = new HashMapEntry(key, value); |
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337 entry.next = elementData[index]; |
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338 elementData[index] = entry; |
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339 return null; |
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340 } |
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341 Object result = entry.value; |
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342 entry.key = key; // important to avoid hanging onto keys that are equal but "old" -- see bug 30607 |
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343 entry.value = value; |
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344 return result; |
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345 } else { |
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346 throw new NullPointerException(); |
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347 } |
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348 } |
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349 |
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350 /** |
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351 * Increases the capacity of this Hashtable. This method is sent when |
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352 * the size of this Hashtable exceeds the load factor. |
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353 */ |
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354 private void rehash() { |
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355 int length = elementData.length << 1; |
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356 if (length is 0) { |
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357 length = 1; |
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358 } |
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359 firstSlot = length; |
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360 lastSlot = -1; |
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361 HashMapEntry[] newData = new HashMapEntry[length]; |
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362 for (int i = elementData.length; --i >= 0;) { |
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363 HashMapEntry entry = elementData[i]; |
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364 while (entry !is null) { |
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365 int index = (toHash(entry.key) & 0x7FFFFFFF) % length; |
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366 if (index < firstSlot) { |
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367 firstSlot = index; |
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368 } |
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369 if (index > lastSlot) { |
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370 lastSlot = index; |
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371 } |
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372 HashMapEntry next = entry.next; |
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373 entry.next = newData[index]; |
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374 newData[index] = entry; |
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375 entry = next; |
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376 } |
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377 } |
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378 elementData = newData; |
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379 computeMaxSize(); |
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380 } |
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381 |
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382 /** |
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383 * Remove the key/value pair with the specified key from this Hashtable. |
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384 * |
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385 * @param key the key to remove |
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386 * @return the value associated with the specified key, null if the specified key |
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387 * did not exist |
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388 */ |
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389 public Object remove(Object key) { |
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390 HashMapEntry last = null; |
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391 int index = (toHash(key) & 0x7FFFFFFF) % elementData.length; |
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392 HashMapEntry entry = elementData[index]; |
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393 while (entry !is null && !keyEquals(key, entry.key)) { |
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394 last = entry; |
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395 entry = entry.next; |
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396 } |
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397 if (entry !is null) { |
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398 if (last is null) { |
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399 elementData[index] = entry.next; |
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400 } else { |
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401 last.next = entry.next; |
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402 } |
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403 elementCount--; |
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404 return entry.value; |
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405 } |
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406 return null; |
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407 } |
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408 |
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409 /** |
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410 * Answers the number of key/value pairs in this Hashtable. |
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411 * |
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412 * @return the number of key/value pairs in this Hashtable |
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413 */ |
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414 public int size() { |
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415 return elementCount; |
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416 } |
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417 |
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418 /** |
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419 * Answers the string representation of this Hashtable. |
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420 * |
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421 * @return the string representation of this Hashtable |
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422 */ |
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423 public override String toString() { |
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424 if (size() is 0) { |
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425 return "{}"; //$NON-NLS-1$ |
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426 } |
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427 |
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428 StringBuffer buffer = new StringBuffer(); |
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429 buffer.append('{'); |
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430 for (int i = elementData.length; --i >= 0;) { |
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431 HashMapEntry entry = elementData[i]; |
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432 while (entry !is null) { |
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433 if( buffer.length > 1 ){ |
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434 buffer.append(", "); //$NON-NLS-1$ |
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435 } |
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436 buffer.append(entry.key.toString); |
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437 buffer.append('='); |
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438 buffer.append(entry.value.toString); |
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439 entry = entry.next; |
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440 } |
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441 } |
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442 buffer.append('}'); |
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443 return buffer.toString(); |
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444 } |
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445 } |