Mercurial > hg > truffle
annotate graal/com.oracle.max.base/src/com/sun/max/collect/IntHashMap.java @ 4184:fa6b78681c54
Added copyright check to the gate.
author | Doug Simon <doug.simon@oracle.com> |
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date | Tue, 03 Jan 2012 12:37:31 +0100 |
parents | bc8527f3071c |
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rev | line source |
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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 |
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29 /** |
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30 * Similar to java.util.HashMap, but with plain primitive ints as keys. |
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31 * Unsynchronized. |
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32 */ |
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33 public class IntHashMap<T> { |
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34 |
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35 private static final int INITIAL_SIZE = 4; |
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36 |
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37 private int[] keys; |
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38 private T[] values; |
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39 private int numberOfValues; |
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40 private int threshold; |
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41 private static final float LOAD_FACTOR = 0.75f; |
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42 |
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43 public IntHashMap() { |
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44 } |
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45 |
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46 /** |
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47 * Constructs an empty {@code IntHashMap} with the specified initial capacity. |
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48 * |
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49 * @param initialCapacity the initial capacity |
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50 * @throws IllegalArgumentException if the initial capacity is negative |
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51 */ |
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52 public IntHashMap(int initialCapacity) { |
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53 if (initialCapacity < 0) { |
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54 throw new IllegalArgumentException("Illegal initial capacity: " + initialCapacity); |
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55 } |
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56 |
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57 // Find a power of 2 >= initialCapacity |
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58 int capacity = Integer.highestOneBit(Math.max(initialCapacity, 1)); |
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59 if (capacity < initialCapacity) { |
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60 capacity <<= 1; |
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61 } |
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62 |
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63 keys = new int[capacity]; |
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64 Class<T[]> type = null; |
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65 values = Utils.newArray(type, capacity); |
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66 setThreshold(); |
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67 } |
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68 |
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69 /** |
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70 * Applies a hash function to a given integer key. This is critical |
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71 * because ArrayHashMapping uses power-of-two length hash tables, that |
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72 * otherwise encounter collisions for integer keys that do not differ |
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73 * in lower bits. |
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74 */ |
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75 static int hash(int key) { |
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76 // This function ensures that hashCodes that differ only by |
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77 // constant multiples at each bit position have a bounded |
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78 // number of collisions (approximately 8 at default load factor). |
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79 final int hash = key ^ ((key >>> 20) ^ (key >>> 12)); |
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80 return hash ^ (hash >>> 7) ^ (hash >>> 4); |
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81 } |
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82 |
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83 /** |
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84 * Returns index for an integer key. |
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85 */ |
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86 static int indexFor(int key, int length) { |
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87 return key & (length - 1); |
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88 } |
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89 |
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90 public T get(int key) { |
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91 if (keys == null) { |
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92 return null; |
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93 } |
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94 int index = key % keys.length; |
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95 if (index < 0) { |
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96 index *= -1; |
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97 } |
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98 final int start = index; |
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99 do { |
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100 final T value = values[index]; |
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101 if (value == null) { |
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102 return null; |
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103 } |
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104 if (keys[index] == key) { |
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105 return values[index]; |
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106 } |
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107 index++; |
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108 index %= keys.length; |
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109 } while (index != start); |
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110 return null; |
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111 } |
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112 |
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113 private void setThreshold() { |
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114 assert keys.length == values.length; |
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115 threshold = (int) (keys.length * LOAD_FACTOR); |
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116 } |
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117 |
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118 public void grow() { |
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119 if (keys == null) { |
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120 keys = new int[INITIAL_SIZE]; |
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121 Class<T[]> type = null; |
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122 values = Utils.newArray(type, INITIAL_SIZE); |
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123 setThreshold(); |
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124 } else { |
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125 final int[] ks = this.keys; |
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126 final T[] vs = this.values; |
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127 final int length = ks.length * 2; |
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128 this.keys = new int[length]; |
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129 Class<T[]> type = null; |
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130 this.values = Utils.newArray(type, length); |
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131 numberOfValues = 0; |
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132 setThreshold(); |
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133 for (int i = 0; i < ks.length; i++) { |
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134 final T value = vs[i]; |
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135 if (value != null) { |
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136 put(ks[i], value); |
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137 } |
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138 } |
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139 } |
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140 } |
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141 |
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142 public T put(int key, T value) { |
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143 assert value != null; |
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144 if (numberOfValues >= threshold) { |
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145 grow(); |
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146 } |
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147 int index = key % keys.length; |
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148 if (index < 0) { |
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149 index *= -1; |
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150 } |
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151 final int start = index; |
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152 while (values[index] != null) { |
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153 if (keys[index] == key) { |
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154 T oldValue = values[index]; |
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155 values[index] = value; |
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156 return oldValue; |
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157 } |
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158 index++; |
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159 index %= keys.length; |
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160 assert index != start; |
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161 } |
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162 keys[index] = key; |
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163 values[index] = value; |
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164 numberOfValues++; |
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165 return null; |
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166 } |
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167 |
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168 public List<T> toList() { |
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169 if (values == null) { |
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170 return Collections.emptyList(); |
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171 } |
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172 final List<T> list = new ArrayList<>(numberOfValues); |
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173 for (int i = 0; i < values.length; i++) { |
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174 final T value = values[i]; |
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175 if (value != null) { |
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176 list.add(value); |
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177 } |
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178 } |
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179 return list; |
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180 } |
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181 |
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182 public int count() { |
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183 return numberOfValues; |
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184 } |
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185 } |