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annotate src/org/tmatesoft/hg/internal/diff/DiffRangeMap.java @ 695:053bb4397bf9

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Refactoring: nice Revlog.indexWalk() implementation
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Mon, 05 Aug 2013 18:45:16 +0200
parents f568330dd9c0
children 7839ff0bfd78
rev   line source
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1 /*
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2 * Copyright (c) 2013 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.diff;
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18
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19 import java.util.ArrayList;
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20
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21 import org.tmatesoft.hg.internal.DiffHelper;
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22 import org.tmatesoft.hg.internal.DiffHelper.MatchInspector;
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23 import org.tmatesoft.hg.internal.IntSliceSeq;
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24 import org.tmatesoft.hg.internal.IntTuple;
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25 import org.tmatesoft.hg.internal.DiffHelper.ChunkSequence;
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26
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27 /**
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28 * Sequence of pairs of ranges (s1Start,s1End) - (s2Start, s2End)
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29 * @author Artem Tikhomirov
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30 * @author TMate Software Ltd.
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31 */
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32 public class DiffRangeMap extends DiffHelper.DeltaInspector<ChunkSequence<?>> {
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33 private final IntSliceSeq ranges;
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34
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35 public DiffRangeMap() {
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36 ranges = new IntSliceSeq(5);
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37 }
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38
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39 /**
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40 * handy method to fill this map from supplied DiffHelper
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41 * <pre>
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42 * DiffHelper<LineSequence> pg = ...
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43 * pg.findMatchingBlocks(p1ToBase); // doesn't compile
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44 * DiffHelper<?> dh = pg;
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45 * dh.findMatchingBlocks(p1ToBase); // compiles ok!
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46 * </pre>
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47 */
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48 @SuppressWarnings("unchecked")
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49 public DiffRangeMap fill(DiffHelper<?> dh) {
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50 @SuppressWarnings("rawtypes")
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51 final MatchInspector i = (MatchInspector) this;
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52 dh.findMatchingBlocks(i);
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53 return this;
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54 }
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55
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56 @Override
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57 protected void added(int s1InsertPoint, int s2From, int s2To) {
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58 ranges.add(s1InsertPoint, s1InsertPoint, s2From, s2To, (int)'+');
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59 }
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60 @Override
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61 protected void changed(int s1From, int s1To, int s2From, int s2To) {
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62 ranges.add(s1From, s1To, s2From, s2To, (int)'*');
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63 }
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64 @Override
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65 protected void deleted(int s2DeletePoint, int s1From, int s1To) {
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66 ranges.add(s1From, s1To, s2DeletePoint, s2DeletePoint, (int)'-');
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67 }
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68 @Override
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69 protected void unchanged(int s1From, int s2From, int length) {
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70 ranges.add(s1From, s1From + length, s2From, s2From + length, (int)'=');
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71 }
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72
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73 public Iterable<RangePair> findInSource(int sourceStart, int sourceEnd) {
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74 ArrayList<RangePair> rv = new ArrayList<RangePair>(4);
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75 for (IntTuple t : ranges) {
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76 int srcRangeStart = t.at(0);
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77 int srcRangeEnd = t.at(1);
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78 if (srcRangeEnd <= sourceStart) { // srcRangeEnd exclusive
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79 continue;
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80 }
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81 if (srcRangeStart >= sourceEnd) {
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82 break;
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83 }
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84 rv.add(new RangePair(srcRangeStart, srcRangeEnd, t.at(2), t.at(3)));
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85 }
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86 return rv;
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87 }
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88
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89 public Iterable<RangePair> insertions() {
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90 return rangesOfKind('+');
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91 }
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92
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93 public Iterable<RangePair> same() {
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94 return rangesOfKind('=');
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95 }
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96
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97 private Iterable<RangePair> rangesOfKind(int kind) {
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98 ArrayList<RangePair> rv = new ArrayList<RangePair>(4);
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99 for (IntTuple t : ranges) {
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100 if (t.at(4) == kind) {
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101 rv.add(new RangePair(t.at(0), t.at(1), t.at(2), t.at(3)));
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102 }
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103 }
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104 return rv;
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105 }
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106
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107 public static final class RangePair {
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108 private final int s1Start;
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109 private final int s1End;
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110 private final int s2Start;
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111 private final int s2End;
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112
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113 public RangePair(int s1Start, int s1End, int s2Start, int s2End) {
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114 this.s1Start = s1Start;
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115 this.s1End = s1End;
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116 this.s2Start = s2Start;
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117 this.s2End = s2End;
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118 }
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119 public int start1() {
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120 return s1Start;
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121 }
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122 public int end1() {
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123 return s1End;
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124 }
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125 public int length1() {
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126 return s1End - s1Start;
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127 }
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128 public int start2() {
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129 return s2Start;
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130 }
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131 public int end2() {
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132 return s2End;
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133 }
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134 public int length2() {
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135 return s2End - s2Start;
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136 }
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137 @Override
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138 public String toString() {
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139 return String.format("[%d..%d)->[%d..%d)", s1Start, s1End, s2Start, s2End);
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140 }
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141 }
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142 }