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annotate src/org/tmatesoft/hg/util/DirectHashSet.java @ 304:85b8efde5586

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Use memory-friendly set implementation to canonicalize filenames and nodeids
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Wed, 21 Sep 2011 18:26:16 +0200
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children 51d682cf9cdc
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304
85b8efde5586 Use memory-friendly set implementation to canonicalize filenames and nodeids
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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1 /*
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2 * Copyright (c) 2011 TMate Software Ltd
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3 *
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4 * This program is free software; you can redistribute it and/or modify
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5 * it under the terms of the GNU General Public License as published by
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6 * the Free Software Foundation; version 2 of the License.
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7 *
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8 * This program is distributed in the hope that it will be useful,
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9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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11 * GNU General Public License for more details.
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12 *
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13 * For information on how to redistribute this software under
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14 * the terms of a license other than GNU General Public License
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15 * contact TMate Software at support@hg4j.com
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16 */
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17 package org.tmatesoft.hg.util;
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18
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19 import org.tmatesoft.hg.internal.Experimental;
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20
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21 /**
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22 * Memory-friendly alternative to HashSet. With slightly worse performance than that of HashSet, uses n * sizeof(HashMap.Entry) less memory
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23 * (i.e. for set of 50k elements saves more than 1 Mb of memory). Besides, elements of this set can be obtained (not only queried for presence) -
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24 * the option essential for canonical mappings (aka Pool)
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25 *
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26 * @author Artem Tikhomirov
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27 * @author TMate Software Ltd.
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28 */
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29 @Experimental
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30 public class DirectHashSet<T> {
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31
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32 private Object[] table;
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33 private int size;
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34 private int threshold;
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35
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36 public DirectHashSet() {
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37 this (16);
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38 }
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39
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40 public DirectHashSet(int capacity) {
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41 int result = 2;
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42 while (result < capacity) {
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43 result <<= 1;
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44 }
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45 table = new Object[result];
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46 threshold = result - (result >>> 2);
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47 }
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48
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49 /**
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50 * Add element to the set.
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51 * @param o element, shall not be <code>null</code>
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52 * @return previous element from the set equal to the argument
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53 */
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54 @SuppressWarnings("unchecked")
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55 public T put(T o) {
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56 final int h = hash(o);
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57 final int mask = table.length - 1;
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58 int i = h & mask;
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59 Object t;
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60 while ((t = table[i]) != null) {
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61 if (t.equals(o)) {
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62 table[i] = o;
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63 return (T) t;
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64 }
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65 i = (i+1) & mask;
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66 }
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67 table[i] = o;
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68 if (++size >= threshold) {
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69 resize();
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70 }
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71 return null;
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72 }
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73
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74 /**
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75 * Query set for the element.
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76 * @param o element, shall not be <code>null</code>
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77 * @return element from the set, if present
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78 */
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79 @SuppressWarnings("unchecked")
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80 public T get(T o) {
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81 final int h = hash(o);
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82 final int mask = table.length - 1;
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83 int i = h & mask;
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84 Object t;
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85 while ((t = table[i]) != null) {
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86 if (t == o || t.equals(o)) {
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87 return (T) t;
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88 }
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89 i = (i+1) & mask;
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90 }
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91 return null;
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92 }
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93
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94 public int size() {
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95 return size;
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96 }
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97
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98 public void clear() {
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99 Object[] t = table;
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100 for (int i = 0, top = t.length; i < top; i++) {
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101 t[i] = null;
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102 }
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103 size = 0;
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104 }
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105
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106 private void resize() {
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107 final int newSize = table.length << 1;
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108 final int newMask = newSize - 1;
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109 Object[] newTable = new Object[newSize];
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110 for (int i = 0, size = table.length; i < size; i++) {
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111 Object t = table[i];
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112 if (t != null) {
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113 table[i] = null;
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114 int x = hash(t) & newMask;
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115 while (newTable[x] != null) {
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116 x = (x+1) & newMask;
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117 }
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118 newTable[x] = t;
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119 }
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120 }
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121 table = newTable;
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122 threshold = newSize - (newSize >>> 2);
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123 }
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124
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125 private static int hash(Object o) {
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126 int h = o.hashCode();
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127 // return h;
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128 // HashMap.newHash()
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129 h ^= (h >>> 20) ^ (h >>> 12);
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130 return h ^ (h >>> 7) ^ (h >>> 4);
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131 }
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132
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133 }