Mercurial > hg > truffle
annotate graal/com.oracle.max.base/src/com/sun/max/collect/ChainedHashMapping.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 * Hash table based implementation of the {@link Mapping} interface. Compared to {@link HashMap}, this data |
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31 * structure can provide better space utilization (the {@link DefaultEntry} chained entry type has one less field than |
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32 * the chained entry type in HashMap) and extensibility (subclasses can override how keys produce a |
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33 * {@link #hashCode(Object) hash code} and how they are tested for {@linkplain #equivalent(Object, Object) equality}). |
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34 * Other differences include: |
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35 * <ul> |
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36 * <li>{@code null} keys are illegal in ChainedHashMapping.</li> |
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37 * <li>Adding a {@code null} value in {@link #put(Object, Object) put} is equivalent to calling |
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38 * {@link #remove(Object) remove} with the given key.</li> |
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39 * <li>The number of buckets used shrinks when the load (i.e. {@linkplain #length() number of entries} / {@linkplain #capacity() capacity}) falls below |
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40 * {@value #MIN_LOAD_FACTOR} after {@link ChainedHashMapping#remove(Object) removing} an entry.</li> |
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41 * </ul> |
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42 * |
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43 * @param <K> the type of keys maintained by this map |
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44 * @param <V> the type of mapped values |
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45 */ |
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46 public class ChainedHashMapping<K, V> extends HashMapping<K, V> implements Mapping<K, V> { |
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47 |
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48 // Note: this implementation is partly derived from java.util.HashMap in the standard JDK |
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49 // In particular, it uses a table whose length is guaranteed to be a power of 2. |
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50 |
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51 /** |
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52 * The default initial capacity - MUST be a power of two. |
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53 */ |
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54 public static final int DEFAULT_INITIAL_CAPACITY = 16; |
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55 |
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56 /** |
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57 * The maximum capacity, used if a higher value is implicitly specified |
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58 * by either of the constructors with arguments. |
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59 * MUST be a power of two <= 1<<30. |
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60 */ |
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61 public static final int MAXIMUM_CAPACITY = 1 << 30; |
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62 |
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63 public static final float MAX_LOAD_FACTOR = 0.75f; |
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64 public static final float MIN_LOAD_FACTOR = 0.25f; |
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65 |
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66 /** |
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67 * The interface for the chained entries of a bucket in a {@link ChainedHashMapping}. |
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68 */ |
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69 public interface Entry<K, V> { |
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70 K key(); |
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71 V value(); |
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72 void setValue(V value); |
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73 Entry<K, V> next(); |
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74 void setNext(Entry<K, V> next); |
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75 } |
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76 |
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77 /** |
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78 * The default chained entry type used by {@link ChainedHashMapping}. This type of chained entry does not cache the hash value of the key. If the |
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79 * computing this hash code is an expensive operation, then using a {@link HashEntryChainedHashMapping} may provide better performance. |
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80 */ |
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81 public static class DefaultEntry<K, V> implements Entry<K, V> { |
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82 final K key; |
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83 V value; |
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84 Entry<K, V> next; |
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85 |
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86 public DefaultEntry(K key, V value, Entry<K, V> next) { |
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87 this.key = key; |
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88 this.value = value; |
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89 this.next = next; |
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90 } |
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91 |
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92 public final K key() { |
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93 return key; |
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94 } |
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95 |
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96 public final Entry<K, V> next() { |
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97 return next; |
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98 } |
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99 |
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100 public void setNext(Entry<K, V> next) { |
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101 this.next = next; |
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102 } |
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103 |
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104 public void setValue(V value) { |
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105 this.value = value; |
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106 } |
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107 |
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108 public final V value() { |
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109 return value; |
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110 } |
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111 |
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112 @Override |
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113 public String toString() { |
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114 return key() + "=" + value(); |
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115 } |
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116 } |
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117 |
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118 private Entry<K, V>[] table; |
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119 |
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120 private int numberOfEntries; |
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121 private int growThreshold; |
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122 private int shrinkThreshold; |
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123 |
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124 private void setThreshold() { |
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125 growThreshold = (int) (table.length * MAX_LOAD_FACTOR); |
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126 shrinkThreshold = (int) (table.length * MIN_LOAD_FACTOR); |
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127 } |
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128 |
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129 /** |
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130 * Creates a chained hash table with {@linkplain HashEquality equality} key semantics and an initial capacity of |
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131 * {@value ChainedHashMapping#DEFAULT_INITIAL_CAPACITY} whose entries record the hash of the key. |
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132 */ |
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133 public ChainedHashMapping() { |
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134 this(null); |
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135 } |
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136 |
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137 /** |
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138 * Creates a chained hash table with a default initial capacity of {@value DEFAULT_INITIAL_CAPACITY}. |
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139 * |
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140 * @param equivalence |
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141 * the semantics of key comparison and hashing. If {@code null}, then {@link HashEquality} is used. |
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142 */ |
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143 public ChainedHashMapping(HashEquivalence<K> equivalence) { |
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144 this(equivalence, DEFAULT_INITIAL_CAPACITY); |
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145 } |
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146 |
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147 /** |
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148 * Creates a chained hash table with {@linkplain HashEquality equality} key semantics. |
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149 * |
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150 * @param initialCapacity |
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151 * the initial capacity of the table |
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152 */ |
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153 public ChainedHashMapping(int initialCapacity) { |
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154 this(null, initialCapacity); |
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155 } |
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156 |
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157 /** |
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158 * Creates a chained hash table. |
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159 * |
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160 * @param equivalence |
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161 * the semantics of key comparison and hashing. If {@code null}, then {@link HashEquality} is used. |
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162 * @param initialCapacity |
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163 * the initial capacity of the table |
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164 */ |
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165 public ChainedHashMapping(HashEquivalence<K> equivalence, int initialCapacity) { |
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166 super(equivalence); |
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167 if (initialCapacity < 0) { |
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168 throw new IllegalArgumentException("Illegal initial capacity: " + initialCapacity); |
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169 } |
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170 |
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171 // Find a power of 2 >= initialCapacity |
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172 int capacity = Integer.highestOneBit(Math.max(Math.min(MAXIMUM_CAPACITY, initialCapacity), 1)); |
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173 if (capacity < initialCapacity) { |
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174 capacity <<= 1; |
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175 } |
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176 |
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177 final Class<Entry<K, V>[]> type = null; |
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178 table = Utils.cast(type, new Entry[capacity]); |
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179 setThreshold(); |
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180 } |
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181 |
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182 /** |
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183 * Applies a supplemental hash function to a given hashCode, which |
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184 * defends against poor quality hash functions. This is critical |
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185 * because BuckHashMapping uses power-of-two length hash tables, that |
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186 * otherwise encounter collisions for hashCodes that do not differ |
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187 * in lower bits. |
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188 */ |
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189 static int hash(int hash) { |
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190 // This function ensures that hashCodes that differ only by |
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191 // constant multiples at each bit position have a bounded |
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192 // number of collisions (approximately 8 at default load factor). |
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193 final int h = hash ^ ((hash >>> 20) ^ (hash >>> 12)); |
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194 return h ^ (h >>> 7) ^ (h >>> 4); |
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195 } |
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196 |
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197 /** |
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198 * Returns index for hash code h. |
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199 */ |
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200 static int indexFor(int h, int length) { |
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201 return h & (length - 1); |
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202 } |
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203 |
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204 public int length() { |
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205 return numberOfEntries; |
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206 } |
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207 |
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208 /** |
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209 * Determines if a given entry matches a given key. |
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210 * <p> |
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211 * This method exists primarily for the benefit of subclasses who can override this implementation with a more |
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212 * efficient one that uses {@code hashForKey}. For example, the {@linkplain HashEntryChainedHashMapping} subclass uses bucket |
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213 * entries that record the hash of a key to avoid re-computing it every time an entry is compared. |
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214 * |
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215 * @param entry |
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216 * the entry to test |
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217 * @param key |
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218 * the key to test |
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219 * @param hashForKey |
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220 * the hash value for {@code key} |
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221 */ |
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222 protected boolean matches(Entry<K, V> entry, K key, int hashForKey) { |
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223 return equivalent(entry.key(), key); |
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224 } |
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225 |
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226 public V get(K key) { |
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227 if (key == null) { |
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228 throw new IllegalArgumentException("Key cannot be null"); |
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229 } |
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230 final int hashForKey = hash(hashCode(key)); |
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231 final int index = indexFor(hashForKey, table.length); |
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232 for (Entry<K, V> entry = table[index]; entry != null; entry = entry.next()) { |
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233 if (matches(entry, key, hashForKey)) { |
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234 return entry.value(); |
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235 } |
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236 } |
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237 return null; |
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238 } |
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239 |
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240 private void resize(int newTableLength) { |
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241 final Class<Entry<K, V>[]> type = null; |
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242 final Entry<K, V>[] newTable = Utils.cast(type, new Entry[newTableLength]); |
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243 transfer(newTable); |
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244 table = newTable; |
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245 setThreshold(); |
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246 } |
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247 |
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248 /** |
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249 * Transfers all entries from current table to newTable. |
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250 */ |
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251 private void transfer(Entry<K, V>[] newTable) { |
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252 final Entry<K, V>[] src = table; |
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253 final int newCapacity = newTable.length; |
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254 for (int j = 0; j < src.length; j++) { |
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255 Entry<K, V> entry = src[j]; |
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256 if (entry != null) { |
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257 do { |
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258 final Entry<K, V> next = entry.next(); |
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259 final int hash = hash(hashCode(entry.key())); |
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260 final int index = indexFor(hash, newCapacity); |
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261 entry.setNext(newTable[index]); |
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262 newTable[index] = entry; |
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263 entry = next; |
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264 } while (entry != null); |
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265 } |
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266 } |
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267 } |
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268 |
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269 public V remove(K key) { |
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270 if (key == null) { |
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271 throw new IllegalArgumentException("Key cannot be null"); |
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272 } |
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273 |
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274 final int hashForKey = hash(hashCode(key)); |
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275 final int index = indexFor(hashForKey, table.length); |
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276 Entry<K, V> prev = table[index]; |
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277 Entry<K, V> entry = prev; |
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278 |
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279 while (entry != null) { |
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280 final Entry<K, V> next = entry.next(); |
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281 if (matches(entry, key, hashForKey)) { |
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282 if (prev == entry) { |
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283 table[index] = next; |
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284 } else { |
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285 prev.setNext(next); |
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286 } |
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287 if (--numberOfEntries < shrinkThreshold) { |
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288 resize(table.length >> 1); |
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289 } |
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290 entry.setNext(null); |
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291 return entry.value(); |
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292 } |
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293 prev = entry; |
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294 entry = next; |
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295 } |
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296 return null; |
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297 } |
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298 |
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299 public V put(K key, V value) { |
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300 if (value == null) { |
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301 return remove(key); |
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302 } |
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303 if (key == null) { |
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304 throw new IllegalArgumentException("Key cannot be null"); |
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305 } |
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306 |
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307 final int hashForKey = hash(hashCode(key)); |
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308 final int index = indexFor(hashForKey, table.length); |
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309 for (Entry<K, V> entry = table[index]; entry != null; entry = entry.next()) { |
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310 if (matches(entry, key, hashForKey)) { |
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311 final V oldValue = entry.value(); |
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312 entry.setValue(value); |
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313 return oldValue; |
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314 } |
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|
315 } |
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316 |
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317 table[index] = createEntry(hashForKey, key, value, table[index]); |
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318 if (numberOfEntries++ >= growThreshold) { |
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319 resize(2 * table.length); |
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320 } |
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321 return null; |
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|
322 } |
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|
323 |
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|
324 public void clear() { |
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|
325 final Class<Entry<K, V>[]> type = null; |
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|
326 table = Utils.cast(type, new Entry[1]); |
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327 numberOfEntries = 0; |
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|
328 setThreshold(); |
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|
329 } |
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|
330 |
4142
bc8527f3071c
Adjust code base to new level of warnings.
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3733
diff
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|
331 protected Entry<K, V> createEntry(@SuppressWarnings("unused") int hashOfKey, K key, V value, Entry<K, V> next) { |
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3733
diff
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|
332 return new DefaultEntry<>(key, value, next); |
3733
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|
333 } |
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|
334 |
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|
335 protected abstract class HashIterator<Type> implements Iterator<Type> { |
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|
336 |
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|
337 /** |
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|
338 * Next entry to return. |
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diff
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|
339 */ |
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|
340 Entry<K, V> nextEntry; |
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|
341 |
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|
342 /** |
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|
343 * Index at which to start searching for the next entry. |
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|
344 */ |
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|
345 int index; |
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|
346 |
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diff
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|
347 HashIterator() { |
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diff
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|
348 // advance to first entry |
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|
349 if (numberOfEntries > 0) { |
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diff
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|
350 final Entry<K, V>[] t = table; |
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changeset
|
351 while (index < t.length && nextEntry == null) { |
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|
352 nextEntry = t[index++]; |
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diff
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|
353 } |
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|
354 } |
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|
355 } |
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|
356 |
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diff
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|
357 public final boolean hasNext() { |
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changeset
|
358 return nextEntry != null; |
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diff
changeset
|
359 } |
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diff
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|
360 |
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diff
changeset
|
361 final Entry<K, V> nextEntry() { |
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diff
changeset
|
362 final Entry<K, V> entry = nextEntry; |
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diff
changeset
|
363 if (entry == null) { |
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parents:
diff
changeset
|
364 throw new NoSuchElementException(); |
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parents:
diff
changeset
|
365 } |
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diff
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|
366 |
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diff
changeset
|
367 nextEntry = entry.next(); |
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parents:
diff
changeset
|
368 if (nextEntry == null) { |
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parents:
diff
changeset
|
369 final Entry<K, V>[] t = table; |
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diff
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|
370 while (index < t.length && nextEntry == null) { |
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diff
changeset
|
371 nextEntry = t[index++]; |
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diff
changeset
|
372 } |
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parents:
diff
changeset
|
373 } |
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parents:
diff
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|
374 return entry; |
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parents:
diff
changeset
|
375 } |
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parents:
diff
changeset
|
376 |
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parents:
diff
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|
377 public void remove() { |
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parents:
diff
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|
378 throw new UnsupportedOperationException(); |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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379 } |
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380 } |
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381 |
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382 protected final class ValueIterator extends HashIterator<V> { |
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383 public V next() { |
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384 return nextEntry().value(); |
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385 } |
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386 } |
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387 |
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388 protected final class KeyIterator extends HashIterator<K> { |
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389 public K next() { |
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390 return nextEntry().key(); |
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391 } |
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392 } |
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393 |
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394 protected final class EntryIterator extends HashIterator<Entry<K, V>> { |
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395 public Entry<K, V> next() { |
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396 return nextEntry(); |
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397 } |
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398 } |
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399 |
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400 public IterableWithLength<K> keys() { |
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401 return new HashMappingIterable<K>() { |
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402 public Iterator<K> iterator() { |
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403 return new KeyIterator(); |
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404 } |
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405 }; |
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406 } |
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407 |
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408 @Override |
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409 public IterableWithLength<V> values() { |
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410 return new HashMappingIterable<V>() { |
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411 public Iterator<V> iterator() { |
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412 return new ValueIterator(); |
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413 } |
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414 }; |
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415 } |
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416 |
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417 /** |
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418 * Gets the capacity of this chained hash table. The capacity is size of the array holding the head of each entry |
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419 * chain. |
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420 * <p> |
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421 * Note that this value may change over time as entries are added and removed from the table. As such, the returned |
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422 * value should only be used for diagnostic purposes. |
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423 */ |
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424 public int capacity() { |
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425 return table.length; |
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426 } |
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427 |
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428 /** |
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429 * Computes the number of entries in the longest chain in the table. A chain longer than about 10 probably indicates |
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430 * a poor hashing function being used for the keys. |
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431 * <p> |
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432 * Note that this value may change over time as entries are added and removed from the table. As such, the returned |
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433 * value should only be used for diagnostic purposes. |
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434 */ |
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435 public int computeLongestChain() { |
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436 int max = 0; |
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437 for (Entry head : table) { |
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438 if (head != null) { |
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439 int total = 0; |
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440 for (Entry e = head; e != null; e = e.next()) { |
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441 ++total; |
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442 } |
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443 max = Math.max(max, total); |
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444 } |
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445 |
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446 } |
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447 return max; |
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448 } |
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449 } |