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annotate src/org/tmatesoft/hg/internal/BatchRangeHelper.java @ 526:2f9ed6bcefa2

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Initial support for Revert command with accompanying minor refactoring
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 15 Jan 2013 17:07:19 +0100
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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18
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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 }