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annotate src/org/tmatesoft/hg/internal/ArrayHelper.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 b9592e21176a
children 6334b0267103
rev   line source
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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.internal;
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18
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19 /**
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20 * Internal alternative to Arrays.sort to build reversed index along with sorting
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21 *
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22 * @author Artem Tikhomirov
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23 * @author TMate Software Ltd.
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24 */
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25 public class ArrayHelper {
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26 private int[] reverse;
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27
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28 @SuppressWarnings("unchecked")
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29 public void sort(Comparable<?>[] a) {
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30 // Object[] aux = (Object[]) a.clone();
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31 reverse = new int[a.length];
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32 sort1((Comparable<Object>[])a, 0, a.length);
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33 for (int i = 0; i < reverse.length; i++) {
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34 // element that was not moved don't have an index in reverse.
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35 // perhaps, can do it inside sort alg?
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36 // Alternatively, may start with filling reverse[] array with initial indexes and
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37 // avoid != 0 comparisons in #swap altogether?
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38 if (reverse[i] == 0) {
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39 reverse[i] = i+1;
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40 }
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41 }
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42 }
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43
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44 /**
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45 * Slightly modified version of Arrays.sort1(int[], int, int) quicksort alg (just to deal with Object[])
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46 */
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47 private void sort1(Comparable<Object> x[], int off, int len) {
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48 // Insertion sort on smallest arrays
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49 if (len < 7) {
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50 for (int i=off; i<len+off; i++)
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51 for (int j=i; j>off && x[j-1].compareTo(x[j]) > 0; j--)
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52 swap(x, j, j-1);
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53 return;
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54 }
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55
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56 // Choose a partition element, v
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57 int m = off + (len >> 1); // Small arrays, middle element
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58 if (len > 7) {
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59 int l = off;
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60 int n = off + len - 1;
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61 if (len > 40) { // Big arrays, pseudomedian of 9
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62 int s = len/8;
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63 l = med3(x, l, l+s, l+2*s);
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64 m = med3(x, m-s, m, m+s);
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65 n = med3(x, n-2*s, n-s, n);
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66 }
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67 m = med3(x, l, m, n); // Mid-size, med of 3
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68 }
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69 Comparable<Object> v = x[m];
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70
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71 // Establish Invariant: v* (<v)* (>v)* v*
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72 int a = off, b = a, c = off + len - 1, d = c;
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73 while(true) {
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74 while (b <= c && x[b].compareTo(v) <= 0) {
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75 if (x[b] == v)
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76 swap(x, a++, b);
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77 b++;
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78 }
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79 while (c >= b && x[c].compareTo(v) >= 0) {
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80 if (x[c] == v)
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81 swap(x, c, d--);
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82 c--;
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83 }
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84 if (b > c)
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85 break;
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86 swap(x, b++, c--);
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87 }
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88
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89 // Swap partition elements back to middle
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90 int s, n = off + len;
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91 s = Math.min(a-off, b-a ); vecswap(x, off, b-s, s);
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92 s = Math.min(d-c, n-d-1); vecswap(x, b, n-s, s);
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93
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94 // Recursively sort non-partition-elements
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95 if ((s = b-a) > 1)
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96 sort1(x, off, s);
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97 if ((s = d-c) > 1)
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98 sort1(x, n-s, s);
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99 }
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100
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101 /**
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102 * Swaps x[a .. (a+n-1)] with x[b .. (b+n-1)].
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103 */
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104 private void vecswap(Object[] x, int a, int b, int n) {
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105 for (int i=0; i<n; i++, a++, b++) {
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106 swap(x, a, b);
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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 * Returns the index of the median of the three indexed integers.
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112 */
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113 private static int med3(Comparable<Object>[] x, int a, int b, int c) {
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114 return (x[a].compareTo(x[b]) < 0 ?
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115 (x[b].compareTo(x[c]) < 0 ? b : x[a].compareTo(x[c]) < 0 ? c : a) :
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116 (x[b].compareTo(x[c]) > 0 ? b : x[a].compareTo(x[c]) > 0 ? c : a));
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117 }
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118
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119
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120 /**
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121 * @return the reverse
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122 */
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123 public int[] getReverse() {
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124 return reverse;
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125 }
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126
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127 /**
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128 * Swaps x[a] with x[b].
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129 */
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130 private void swap(Object[] x, int a, int b) {
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131 Object t = x[a];
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132 x[a] = x[b];
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133 x[b] = t;
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134 int z1 = reverse[a] != 0 ? reverse[a] : a+1;
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135 int z2 = reverse[b] != 0 ? reverse[b] : b+1;
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136 reverse[b] = z1;
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137 reverse[a] = z2;
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138 }
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139 }