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annotate src/org/tmatesoft/hg/util/DirectHashSet.java @ 338:3cfa4d908fc9

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Add options to control DataAccessProvider, allow to turn off use of file memory mapping in particular to solve potential sharing violation (os file handle gets released on MappedByteByffer being GC'd, not on FileChannel.close())
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 15 Nov 2011 04:47:03 +0100
parents 85b8efde5586
children 51d682cf9cdc
rev   line source
304
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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 }