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annotate src/org/tmatesoft/hg/internal/ArrayHelper.java @ 308:3f40262153a4

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author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Sat, 24 Sep 2011 07:29:05 +0200
parents 2f2ab5c27f41
children 237de162be28
rev   line source
307
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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
2f2ab5c27f41 Collect sort reverse indexes along with array sorting
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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 *
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21 * @author Artem Tikhomirov
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22 * @author TMate Software Ltd.
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23 */
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24 public class ArrayHelper {
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25 private int[] reverse;
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26
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27 @SuppressWarnings("unchecked")
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28 public void sort(Comparable<?>[] a) {
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29 // Object[] aux = (Object[]) a.clone();
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30 reverse = new int[a.length];
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31 sort1((Comparable<Object>[])a, 0, a.length);
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32 }
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33
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34 private void sort1(Comparable<Object> x[], int off, int len) {
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35 // Insertion sort on smallest arrays
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36 if (len < 7) {
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37 for (int i=off; i<len+off; i++)
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38 for (int j=i; j>off && x[j-1].compareTo(x[j]) > 0; j--)
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39 swap(x, j, j-1);
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40 return;
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41 }
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42
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43 // Choose a partition element, v
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44 int m = off + (len >> 1); // Small arrays, middle element
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45 if (len > 7) {
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46 int l = off;
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47 int n = off + len - 1;
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48 if (len > 40) { // Big arrays, pseudomedian of 9
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49 int s = len/8;
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50 l = med3(x, l, l+s, l+2*s);
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51 m = med3(x, m-s, m, m+s);
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52 n = med3(x, n-2*s, n-s, n);
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53 }
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54 m = med3(x, l, m, n); // Mid-size, med of 3
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55 }
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56 Comparable<Object> v = x[m];
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57
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58 // Establish Invariant: v* (<v)* (>v)* v*
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59 int a = off, b = a, c = off + len - 1, d = c;
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60 while(true) {
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61 while (b <= c && x[b].compareTo(v) <= 0) {
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62 if (x[b] == v)
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63 swap(x, a++, b);
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64 b++;
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65 }
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66 while (c >= b && x[c].compareTo(v) >= 0) {
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67 if (x[c] == v)
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68 swap(x, c, d--);
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69 c--;
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70 }
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71 if (b > c)
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72 break;
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73 swap(x, b++, c--);
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74 }
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75
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76 // Swap partition elements back to middle
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77 int s, n = off + len;
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78 s = Math.min(a-off, b-a ); vecswap(x, off, b-s, s);
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79 s = Math.min(d-c, n-d-1); vecswap(x, b, n-s, s);
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80
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81 // Recursively sort non-partition-elements
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82 if ((s = b-a) > 1)
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83 sort1(x, off, s);
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84 if ((s = d-c) > 1)
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85 sort1(x, n-s, s);
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86 }
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87
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88 /**
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89 * Swaps x[a .. (a+n-1)] with x[b .. (b+n-1)].
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90 */
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91 private void vecswap(Object[] x, int a, int b, int n) {
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92 for (int i=0; i<n; i++, a++, b++) {
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93 swap(x, a, b);
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94 }
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95 }
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96
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97 /**
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98 * Returns the index of the median of the three indexed integers.
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99 */
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100 private static int med3(Comparable<Object>[] x, int a, int b, int c) {
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101 return (x[a].compareTo(x[b]) < 0 ?
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102 (x[b].compareTo(x[c]) < 0 ? b : x[a].compareTo(x[c]) < 0 ? c : a) :
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103 (x[b].compareTo(x[c]) > 0 ? b : x[a].compareTo(x[c]) > 0 ? c : a));
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104 }
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105
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106
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107 /**
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108 * @return the reverse
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109 */
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110 public int[] getReverse() {
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111 return reverse;
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112 }
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113
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114 /**
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115 * Swaps x[a] with x[b].
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116 */
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117 private void swap(Object[] x, int a, int b) {
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118 Object t = x[a];
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119 x[a] = x[b];
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120 x[b] = t;
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121 int z1 = reverse[a] != 0 ? reverse[a] : a+1;
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122 int z2 = reverse[b] != 0 ? reverse[b] : b+1;
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123 reverse[b] = z1;
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124 reverse[a] = z2;
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125 }
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126 }