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annotate graal/com.oracle.max.base/src/com/sun/max/collect/HashEntryChainedHashMapping.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 /**
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26 * A chained hash table whose {@linkplain HashEntry entries} record the hash of the key. This can provide better
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27 * performance improvement when the cost of computing the key's hash code is high.
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28 */
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29 public class HashEntryChainedHashMapping<K, V> extends ChainedHashMapping<K, V> {
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30
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31 public static class HashEntry<K, V> extends DefaultEntry<K, V> {
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32
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33 final int hashOfKey;
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34
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35 public HashEntry(int hashOfKey, K key, V value, Entry<K, V> next) {
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36 super(key, value, next);
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37 this.hashOfKey = hashOfKey;
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38 }
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39 }
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40
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41 /**
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42 * Creates a chained hash table whose entries record the hash of the key.
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43 *
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44 * @param equivalence
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45 * the semantics of key comparison and hashing. If {@code null}, then {@link HashEquality} is used.
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46 * @param initialCapacity
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47 * the initial capacity of the table
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48 */
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49 public HashEntryChainedHashMapping(HashEquivalence<K> equivalence, int initialCapacity) {
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50 super(equivalence, initialCapacity);
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51 }
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52
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53 /**
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54 * Creates a chained hash table with {@linkplain HashEquality equality} key semantics whose entries record the hash
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55 * of the key.
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56 *
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57 * @param initialCapacity
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58 * the initial capacity of the table
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59 */
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60 public HashEntryChainedHashMapping(int initialCapacity) {
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61 super(initialCapacity);
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62 }
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63
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64 /**
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65 * Creates a chained hash table with an initial capacity of {@value ChainedHashMapping#DEFAULT_INITIAL_CAPACITY}
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66 * whose entries record the hash of the key.
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67 *
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68 * @param equivalence
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69 * the semantics of key comparison and hashing. If {@code null}, then {@link HashEquality} is used.
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70 */
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71 public HashEntryChainedHashMapping(HashEquivalence<K> equivalence) {
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72 super(equivalence);
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73 }
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74
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75 /**
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76 * Creates a chained hash table with {@linkplain HashEquality equality} key semantics and an initial capacity of
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77 * {@value ChainedHashMapping#DEFAULT_INITIAL_CAPACITY} whose entries record the hash of the key.
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78 */
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79 public HashEntryChainedHashMapping() {
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80 super();
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81 }
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82
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83 @Override
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84 protected Entry<K, V> createEntry(int hashOfKey, K key, V value, Entry<K, V> next) {
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85 return new HashEntryChainedHashMapping.HashEntry<>(hashOfKey, key, value, next);
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86 }
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87
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88 @Override
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89 protected boolean matches(Entry<K, V> entry, K key, int hashForKey) {
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90 final K entryKey = entry.key();
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91 return entryKey == key || (hashForKey == ((HashEntryChainedHashMapping.HashEntry) entry).hashOfKey && key.equals(entryKey));
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92 }
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93 }