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annotate graal/com.oracle.max.base/src/com/sun/max/collect/HashMapping.java @ 4142:bc8527f3071c

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Adjust code base to new level of warnings.
author Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
date Sun, 18 Dec 2011 05:24:06 +0100
parents e233f5660da4
children
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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 }