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annotate src/org/tmatesoft/hg/internal/ArrayHelper.java @ 326:d42a45a2c9d6

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author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 04 Oct 2011 06:28:01 +0200
parents b9592e21176a
children 6334b0267103
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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 }