Mercurial > hg > truffle
annotate graal/com.oracle.max.base/src/com/sun/max/collect/HashMapping.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 |
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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 /** |
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28 * This class provides a skeletal implementation of the {@link Mapping} interface, to minimize the effort required to |
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29 * implement this interface. |
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30 * <p> |
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31 * This class also includes a number of factory methods for creating {@code Mapping} instances with various properties. |
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32 */ |
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33 public abstract class HashMapping<K, V> implements Mapping<K, V> { |
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34 |
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35 private final HashEquivalence<K> equivalence; |
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36 |
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37 /** |
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38 * Determines if two given keys are equal. |
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39 * <p> |
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40 * Subclasses override this method to define equivalence without delegating to a {@link HashEquivalence} object. |
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41 */ |
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42 protected boolean equivalent(K key1, K key2) { |
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43 return equivalence.equivalent(key1, key2); |
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44 } |
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45 |
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46 /** |
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47 * Computes a hash code for a given key. |
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48 * <p> |
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49 * Subclasses override this method to compute a hash code without delegating to a {@link HashEquivalence} object. |
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50 */ |
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51 protected int hashCode(K key) { |
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52 // Don't guard against a negative number here as the caller needs to convert the hash code into a valid index |
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53 // which will involve range checking anyway |
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54 return equivalence.hashCode(key); |
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55 } |
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56 |
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57 /** |
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58 * Creates a hash table. |
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59 * |
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60 * @param equivalence |
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61 * the semantics to be used for comparing keys. If {@code null} is provided, then {@link HashEquality} is |
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62 * used. |
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63 */ |
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64 protected HashMapping(HashEquivalence<K> equivalence) { |
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65 if (equivalence == null) { |
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66 final Class<HashEquality<K>> type = null; |
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67 this.equivalence = HashEquality.instance(type); |
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68 } else { |
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69 this.equivalence = equivalence; |
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70 } |
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71 } |
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72 |
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73 public boolean containsKey(K key) { |
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74 return get(key) != null; |
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75 } |
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76 |
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77 protected abstract class HashMappingIterable<Type> implements IterableWithLength<Type> { |
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78 public int size() { |
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79 return HashMapping.this.length(); |
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80 } |
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81 } |
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82 |
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83 /** |
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84 * Gets an iterator over the values in this mapping by looking up each {@linkplain #keys() key}. |
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85 * <p> |
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86 * Subclasses will most likely override this method with a more efficient implementation. |
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87 */ |
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88 public IterableWithLength<V> values() { |
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89 return new HashMappingIterable<V>() { |
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90 private final IterableWithLength<K> keys = keys(); |
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91 public Iterator<V> iterator() { |
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92 return new Iterator<V>() { |
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93 private final Iterator<K> keyIterator = keys.iterator(); |
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94 |
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95 public boolean hasNext() { |
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96 return keyIterator.hasNext(); |
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97 } |
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98 |
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99 public V next() { |
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100 return get(keyIterator.next()); |
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101 } |
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102 |
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103 public void remove() { |
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104 throw new UnsupportedOperationException(); |
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105 } |
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106 }; |
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107 } |
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108 }; |
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109 } |
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110 |
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111 public static <K, V> Mapping<K, V> createMapping(HashEquivalence<K> equivalence) { |
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112 return new OpenAddressingHashMapping<>(equivalence); |
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113 } |
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114 |
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115 public static <K, V> Mapping<K, V> createIdentityMapping() { |
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116 final Class<HashIdentity<K>> type = null; |
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117 return createMapping(HashIdentity.instance(type)); |
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118 } |
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119 |
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120 public static <K, V> Mapping<K, V> createEqualityMapping() { |
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121 final Class<HashEquality<K>> type = null; |
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122 return createMapping(HashEquality.instance(type)); |
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123 } |
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124 |
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125 public static <K, V> Mapping<K, V> createVariableMapping(HashEquivalence<K> equivalence) { |
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126 return new ChainedHashMapping<>(equivalence); |
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127 } |
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128 |
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129 public static <K, V> Mapping<K, V> createVariableIdentityMapping() { |
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130 final Class<HashIdentity<K>> type = null; |
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131 return createVariableMapping(HashIdentity.instance(type)); |
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132 } |
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133 |
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134 public static <K, V> Mapping<K, V> createVariableEqualityMapping() { |
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135 final Class<HashEquality<K>> type = null; |
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136 return createVariableMapping(HashEquality.instance(type)); |
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137 } |
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138 } |