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annotate src/org/tmatesoft/hg/internal/BatchRangeHelper.java @ 709:497e697636fc

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Report merged lines as changed block if possible, not as a sequence of added/deleted blocks. To facilitate access to merge parent lines AddBlock got mergeLineAt() method that reports index of the line in the second parent (if any), while insertedAt() has been changed to report index in the first parent always
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Wed, 21 Aug 2013 16:23:27 +0200
parents 1ee452f31187
children
rev   line source
520
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1 /*
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2 * Copyright (c) 2012 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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19 import java.util.Arrays;
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20 import java.util.NoSuchElementException;
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21
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22 /**
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23 * Helper to break given range [start..end] (inclusive bounds) to series of ranges,
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24 * all but last are of batchSize length, and the last one is at most of batchSize+batchSizeTolerance length.
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25 *
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26 * Range is [{@link #start()rangeStart}..{@link #end() rangeEnd}], where rangeStart is less or equal to rangeEnd.
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27 *
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28 * When reverse range iteration is requested, original range is iterated from end to start, but the subranges
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29 * boundaries are in natural order. i.e. for 0..100, 10 first subrange would be [91..100], not [100..91]. This
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30 * helps clients of this class to get [start()..end()] in natural order regardless of iteration direction.
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31 *
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32 * Note, this class (and its treatment of inclusive boundaries) is designed solely for use with methods that navigate
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33 * revlogs and take (start,end) pair of inclusive range.
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34 *
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35 * @author Artem Tikhomirov
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36 * @author TMate Software Ltd.
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37 */
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38 public class BatchRangeHelper {
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39
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40 private final int rangeCount;
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41 private final int rangeDelta;
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42 private final int nextValueDelta;
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43 private final int firstBoundary, lastBoundary;
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44 private int rangeIndex, rangeValue, rangeStart, rangeEnd;
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45
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46 public BatchRangeHelper(int start, int end, int batchSize, boolean reverse) {
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47 this(start, end, batchSize, batchSize/5, reverse);
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48 }
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49
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50 public BatchRangeHelper(int start, int end, int batchSize, int batchSizeTolerance, boolean reverse) {
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51 assert end >= start;
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52 assert start >= 0;
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53 assert batchSize > 0;
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54 assert batchSizeTolerance >= 0;
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55 final int totalElements = end-start+1;
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56 int batchRangeCount = totalElements / batchSize;
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57 // batchRangeCount == 0, totalElements > 0 => need at least 1 range
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58 if (batchRangeCount == 0 || batchRangeCount*batchSize+batchSizeTolerance < totalElements) {
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59 batchRangeCount++;
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60 }
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61 rangeCount = batchRangeCount;
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62 rangeDelta = batchSize-1; // ranges are inclusive, and always grow naturally.
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63 nextValueDelta = reverse ? -batchSize : batchSize;
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64 firstBoundary = reverse ? end-rangeDelta : start;
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65 lastBoundary = reverse ? start : end;
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66 reset();
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67 }
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68
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69 public boolean hasNext() {
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70 return rangeIndex < rangeCount;
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71 }
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72
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73 public void next() {
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74 if (!hasNext()) {
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75 throw new NoSuchElementException();
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76 }
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77 rangeStart = rangeValue;
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78 rangeEnd = rangeValue + rangeDelta;
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79 rangeValue += nextValueDelta;
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80 if (++rangeIndex >= rangeCount) {
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81 if (nextValueDelta < 0) {
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82 // reverse iteration, lastBoundary represents start
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83 rangeStart = lastBoundary;
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84 } else {
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85 // lastBoundary represents end
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86 rangeEnd = lastBoundary;
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87 }
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88 }
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89 }
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90
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91 public int start() {
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92 return rangeStart;
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93 }
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94
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95 public int end() {
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96 return rangeEnd;
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97 }
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98
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99 public BatchRangeHelper reset() {
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100 rangeValue = firstBoundary;
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101 rangeIndex = 0;
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102 return this;
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103 }
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104
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105 public int[] toArray() {
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106 int[] rv = new int[rangeCount*2];
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107 reset();
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108 int i = 0;
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109 while (hasNext()) {
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110 next();
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111 rv[i++] = start();
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112 rv[i++] = end();
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113 }
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114 reset();
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115 return rv;
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116 }
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117
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118 public static void main(String[] args) {
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119 System.out.println("With remainder within tolerance");
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120 System.out.println(Arrays.toString(new BatchRangeHelper(0, 102, 10, 4, false).toArray()));
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121 System.out.println(Arrays.toString(new BatchRangeHelper(0, 102, 10, 4, true).toArray()));
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122 System.out.println("With remainder out of tolerance");
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123 System.out.println(Arrays.toString(new BatchRangeHelper(0, 102, 10, 2, false).toArray()));
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124 System.out.println(Arrays.toString(new BatchRangeHelper(0, 102, 10, 2, true).toArray()));
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125 System.out.println("Range smaller than batch");
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126 System.out.println(Arrays.toString(new BatchRangeHelper(1, 9, 10, false).toArray()));
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127 System.out.println(Arrays.toString(new BatchRangeHelper(1, 9, 10, true).toArray()));
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128 System.out.println("Range smaller than batch and smaller than tolerance");
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129 System.out.println(Arrays.toString(new BatchRangeHelper(1, 9, 10, 20, false).toArray()));
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130 System.out.println(Arrays.toString(new BatchRangeHelper(1, 9, 10, 20, true).toArray()));
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131 System.out.println("Zero tolerance");
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132 System.out.println(Arrays.toString(new BatchRangeHelper(0, 100, 10, 0, false).toArray()));
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133 System.out.println(Arrays.toString(new BatchRangeHelper(0, 100, 10, 0, true).toArray()));
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134 System.out.println("Right to boundary");
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135 System.out.println(Arrays.toString(new BatchRangeHelper(1, 100, 10, false).toArray()));
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136 System.out.println(Arrays.toString(new BatchRangeHelper(1, 100, 10, true).toArray()));
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137 }
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138 }