Mercurial > hg > truffle
annotate graal/com.oracle.max.base/src/com/sun/max/collect/OpenAddressingHashMapping.java @ 3733:e233f5660da4
Added Java files from Maxine project.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Sat, 17 Dec 2011 19:59:18 +0100 |
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1 /* |
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2 * Copyright (c) 2007, 2011, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. |
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8 * |
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9 * This code is distributed in the hope that it will be useful, but WITHOUT |
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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12 * version 2 for more details (a copy is included in the LICENSE file that |
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13 * accompanied this code). |
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14 * |
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15 * You should have received a copy of the GNU General Public License version |
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16 * 2 along with this work; if not, write to the Free Software Foundation, |
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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18 * |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
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22 */ |
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23 package com.sun.max.collect; |
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24 |
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25 import java.util.*; |
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26 |
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27 import com.sun.max.*; |
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28 import com.sun.max.lang.*; |
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29 |
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30 /** |
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31 * An open addressing hash table with liner probe hash collision resolution. |
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32 */ |
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33 public class OpenAddressingHashMapping<K, V> extends HashMapping<K, V> implements Mapping<K, V> { |
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34 |
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35 // Note: this implementation is partly derived from java.util.IdentityHashMap in the standard JDK |
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36 |
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37 /** |
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38 * The initial capacity used by the no-args constructor. |
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39 * MUST be a power of two. The value 32 corresponds to the |
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40 * (specified) expected maximum size of 21, given a load factor |
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41 * of 2/3. |
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42 */ |
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43 private static final int DEFAULT_CAPACITY = 32; |
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44 |
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45 /** |
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46 * The minimum capacity, used if a lower value is implicitly specified |
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47 * by either of the constructors with arguments. The value 4 corresponds |
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48 * to an expected maximum size of 2, given a load factor of 2/3. |
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49 * MUST be a power of two. |
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50 */ |
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51 private static final int MINIMUM_CAPACITY = 4; |
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52 |
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53 /** |
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54 * The maximum capacity, used if a higher value is implicitly specified |
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55 * by either of the constructors with arguments. |
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56 * MUST be a power of two <= 1<<29. |
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57 */ |
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58 private static final int MAXIMUM_CAPACITY = 1 << 29; |
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59 |
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60 /** |
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61 * The table, resized as necessary. Length MUST always be a power of two. |
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62 */ |
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63 private Object[] table; |
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64 |
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65 /** |
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66 * Returns the appropriate capacity for the specified expected maximum |
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67 * size. Returns the smallest power of two between MINIMUM_CAPACITY |
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68 * and MAXIMUM_CAPACITY, inclusive, that is greater than |
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69 * (3 * expectedMaxSize)/2, if such a number exists. Otherwise |
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70 * returns MAXIMUM_CAPACITY. If (3 * expectedMaxSize)/2 is negative, it |
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71 * is assumed that overflow has occurred, and MAXIMUM_CAPACITY is returned. |
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72 */ |
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73 private static int capacity(int expectedMaxSize) { |
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74 // Compute minimum capacity for expectedMaxSize given a load factor of 2/3 |
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75 final int minimumCapacity = (3 * expectedMaxSize) >> 1; |
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76 |
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77 // Compute the appropriate capacity |
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78 int result; |
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79 if (minimumCapacity > MAXIMUM_CAPACITY || minimumCapacity < 0) { |
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80 result = MAXIMUM_CAPACITY; |
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81 } else { |
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82 result = MINIMUM_CAPACITY; |
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83 while (result < minimumCapacity) { |
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84 result <<= 1; |
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85 } |
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86 } |
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87 return result; |
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88 } |
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89 |
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90 /** |
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91 * Constructs a new, empty open addressing hash table with {@linkplain HashEquality equality} key semantics and a |
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92 * default expected maximum size of 21. |
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93 */ |
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94 public OpenAddressingHashMapping() { |
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95 this(null); |
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96 } |
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97 |
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98 /** |
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99 * Constructs a new, empty open addressing hash table with a default expected maximum size of 21. |
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100 * |
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101 * @param equivalence |
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102 * the semantics to be used for comparing keys. If {@code null} is provided, then {@link HashEquality} is |
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103 * used. |
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104 */ |
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105 public OpenAddressingHashMapping(HashEquivalence<K> equivalence) { |
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106 this(equivalence, (DEFAULT_CAPACITY * 2) / 3); |
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107 } |
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108 |
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109 /** |
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110 * Constructs a new, empty open addressing hash table with {@linkplain HashEquality equality} key semantics. |
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111 * |
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112 * @param expectedMaximumSize |
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113 * the expected maximum size of the map |
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114 */ |
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115 public OpenAddressingHashMapping(int expectedMaximumSize) { |
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116 this(null, expectedMaximumSize); |
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117 } |
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118 |
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119 /** |
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120 * Constructs a new, empty open addressing hash table with the specified expected maximum size. Putting more than |
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121 * the expected number of key-value mappings into the map may cause the internal data structure to grow, which may |
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122 * be somewhat time-consuming. |
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123 * |
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124 * @param equivalence |
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125 * the semantics to be used for comparing keys. If {@code null} is provided, then {@link HashEquality} is |
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126 * used. |
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127 * @param expectedMaximumSize |
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128 * the expected maximum size of the map |
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129 * @throws IllegalArgumentException |
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130 * if {@code expectedMaximumSize} is negative |
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131 */ |
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132 public OpenAddressingHashMapping(HashEquivalence<K> equivalence, int expectedMaximumSize) { |
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133 super(equivalence); |
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134 if (expectedMaximumSize < 0) { |
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135 throw new IllegalArgumentException("Illegal initial capacity: " + expectedMaximumSize); |
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136 } |
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137 |
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138 // Find a power of 2 >= initialCapacity |
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139 final int capacity = capacity(expectedMaximumSize); |
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140 threshold = (capacity * 2) / 3; |
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141 table = new Object[capacity * 2]; |
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142 } |
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143 |
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144 private int numberOfEntries; |
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145 private int threshold; |
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146 |
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147 public int length() { |
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148 return numberOfEntries; |
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149 } |
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150 |
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151 /** |
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152 * Applies a supplemental hash function to a given hashCode, which |
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153 * defends against poor quality hash functions. This is critical |
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154 * because BuckHashMapping uses power-of-two length hash tables, that |
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155 * otherwise encounter collisions for hashCodes that do not differ |
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156 * in lower bits. |
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157 */ |
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158 static int hash(int hash) { |
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159 // This function ensures that hashCodes that differ only by |
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160 // constant multiples at each bit position have a bounded |
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161 // number of collisions (approximately 8 at default load factor). |
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162 final int h = hash ^ ((hash >>> 20) ^ (hash >>> 12)); |
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163 return h ^ (h >>> 7) ^ (h >>> 4); |
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164 } |
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165 |
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166 /** |
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167 * Returns index for hash code h. |
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168 */ |
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169 static int indexFor(int h, int length) { |
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170 // Multiply by -127, and left-shift to use least bit as part of hash |
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171 final int index = ((h << 1) - (h << 8)) & (length - 1); |
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172 assert (index & 1) == 0 : "index must be even"; |
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173 return index; |
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174 } |
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175 |
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176 /** |
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177 * Circularly traverses table of size {@code length}. |
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178 */ |
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179 private static int nextKeyIndex(int i, int length) { |
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180 return i + 2 < length ? i + 2 : 0; |
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181 } |
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182 |
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183 public V get(K key) { |
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184 if (key == null) { |
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185 throw new IllegalArgumentException("Key cannot be null"); |
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186 } |
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187 |
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188 final Object[] tbl = this.table; |
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189 final int length = tbl.length; |
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190 final int hash = hash(hashCode(key)); |
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191 int index = indexFor(hash, tbl.length); |
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192 while (true) { |
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193 final Object item = tbl[index]; |
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194 final Class<K> keyType = null; |
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195 final K entryKey = Utils.cast(keyType, item); |
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196 if (equivalent(entryKey, key)) { |
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197 final Class<V> valueType = null; |
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198 return Utils.cast(valueType, tbl[index + 1]); |
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199 } |
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200 if (item == null) { |
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201 return null; |
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202 } |
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203 index = nextKeyIndex(index, length); |
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204 } |
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205 } |
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206 |
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207 public V put(K key, V value) { |
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208 if (key == null) { |
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209 throw new IllegalArgumentException("Key cannot be null"); |
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210 } |
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211 if (value == null) { |
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212 throw new IllegalArgumentException("Value cannot be null"); |
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213 } |
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214 |
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215 final Object[] tbl = this.table; |
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216 final int length = tbl.length; |
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217 final int hash = hash(hashCode(key)); |
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218 int index = indexFor(hash, tbl.length); |
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219 |
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220 Object item = tbl[index]; |
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221 while (item != null) { |
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222 final Class<K> keyType = null; |
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223 final K entryKey = Utils.cast(keyType, item); |
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224 if (equivalent(entryKey, key)) { |
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225 final Class<V> valueType = null; |
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226 final V oldValue = Utils.cast(valueType, tbl[index + 1]); |
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227 tbl[index + 1] = value; |
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228 return oldValue; |
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229 } |
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230 index = nextKeyIndex(index, length); |
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231 item = tbl[index]; |
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232 } |
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|
233 |
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234 tbl[index] = key; |
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235 tbl[index + 1] = value; |
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236 if (numberOfEntries++ >= threshold) { |
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237 resize(length); // length == 2 * current capacity. |
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238 } |
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239 return null; |
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240 |
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241 } |
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242 |
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243 public V remove(K key) { |
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244 if (key == null) { |
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|
245 throw new IllegalArgumentException("Key cannot be null"); |
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|
246 } |
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247 |
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248 final Object[] tbl = this.table; |
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249 final int length = tbl.length; |
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250 final int hash = hash(hashCode(key)); |
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|
251 int index = indexFor(hash, tbl.length); |
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252 |
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253 while (true) { |
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254 final Object item = tbl[index]; |
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255 final Class<K> keyType = null; |
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256 final K entryKey = Utils.cast(keyType, item); |
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257 if (equivalent(entryKey, key)) { |
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258 numberOfEntries--; |
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259 final Class<V> valueType = null; |
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260 final V oldValue = Utils.cast(valueType, tbl[index + 1]); |
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261 tbl[index + 1] = null; |
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262 tbl[index] = null; |
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263 return oldValue; |
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264 } |
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265 if (item == null) { |
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266 return null; |
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267 } |
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268 index = nextKeyIndex(index, length); |
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269 } |
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270 } |
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271 |
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272 public void clear() { |
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273 for (int i = 0; i != table.length; ++i) { |
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274 table[i] = null; |
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275 } |
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276 numberOfEntries = 0; |
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277 } |
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278 |
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279 /** |
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280 * Resize the table to hold given capacity. |
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281 * |
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282 * @param newCapacity the new capacity, must be a power of two. |
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283 */ |
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284 private void resize(int newCapacity) { |
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285 assert Ints.isPowerOfTwoOrZero(newCapacity) : "newCapacity must be a power of 2"; |
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286 final int newLength = newCapacity * 2; |
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287 |
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288 final Object[] oldTable = table; |
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289 final int oldLength = oldTable.length; |
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290 if (oldLength == 2 * MAXIMUM_CAPACITY) { // can't expand any further |
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291 if (threshold == MAXIMUM_CAPACITY - 1) { |
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292 throw new IllegalStateException("Capacity exhausted."); |
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293 } |
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294 threshold = MAXIMUM_CAPACITY - 1; // Gigantic map! |
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295 return; |
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296 } |
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297 if (oldLength >= newLength) { |
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298 return; |
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299 } |
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300 |
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301 final Object[] newTable = new Object[newLength]; |
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302 threshold = newLength / 3; |
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303 |
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304 for (int i = 0; i < oldLength; i += 2) { |
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305 final Class<K> keyType = null; |
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306 final K key = Utils.cast(keyType, oldTable[i]); |
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307 if (key != null) { |
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308 final Object value = oldTable[i + 1]; |
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309 oldTable[i] = null; |
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310 oldTable[i + 1] = null; |
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311 final int hash = hash(hashCode(key)); |
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312 int index = indexFor(hash, newLength); |
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313 while (newTable[index] != null) { |
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314 index = nextKeyIndex(index, newLength); |
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315 } |
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316 newTable[index] = key; |
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317 newTable[index + 1] = value; |
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318 } |
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319 } |
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320 table = newTable; |
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|
321 } |
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322 |
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323 private abstract class HashIterator<Type> implements Iterator<Type> { |
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324 |
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|
325 /** |
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326 * Current slot. |
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|
327 */ |
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|
328 int index = numberOfEntries != 0 ? 0 : table.length; |
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329 |
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|
330 /** |
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|
331 * To avoid unnecessary next computation. |
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|
332 */ |
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|
333 boolean indexIsValid; |
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diff
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|
334 |
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335 public boolean hasNext() { |
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336 for (int i = index; i < table.length; i += 2) { |
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337 final Object key = table[i]; |
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338 if (key != null) { |
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|
339 index = i; |
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340 indexIsValid = true; |
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|
341 return true; |
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|
342 } |
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|
343 } |
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344 index = table.length; |
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|
345 return false; |
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|
346 } |
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347 |
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348 protected int nextIndex() { |
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|
349 if (!indexIsValid && !hasNext()) { |
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350 throw new NoSuchElementException(); |
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changeset
|
351 } |
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|
352 |
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|
353 indexIsValid = false; |
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|
354 final int lastReturnedIndex = index; |
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|
355 index += 2; |
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|
356 return lastReturnedIndex; |
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changeset
|
357 } |
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|
358 |
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diff
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|
359 public void remove() { |
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|
360 throw new UnsupportedOperationException(); |
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parents:
diff
changeset
|
361 } |
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changeset
|
362 } |
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|
363 |
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diff
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|
364 private class KeyIterator extends HashIterator<K> { |
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changeset
|
365 public K next() { |
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|
366 final Class<K> keyType = null; |
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|
367 return Utils.cast(keyType, table[nextIndex()]); |
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|
368 } |
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changeset
|
369 } |
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|
370 |
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diff
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|
371 private class ValueIterator extends HashIterator<V> { |
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changeset
|
372 public V next() { |
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diff
changeset
|
373 final Class<V> valueType = null; |
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|
374 return Utils.cast(valueType, table[nextIndex() + 1]); |
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|
375 } |
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parents:
diff
changeset
|
376 } |
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parents:
diff
changeset
|
377 |
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diff
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|
378 public IterableWithLength<K> keys() { |
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|
379 return new HashMappingIterable<K>() { |
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parents:
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|
380 public Iterator<K> iterator() { |
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381 return new KeyIterator(); |
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382 } |
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383 }; |
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384 } |
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385 |
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386 @Override |
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387 public IterableWithLength<V> values() { |
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388 return new HashMappingIterable<V>() { |
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389 public Iterator<V> iterator() { |
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390 return new ValueIterator(); |
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391 } |
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392 }; |
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393 } |
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394 } |