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annotate src/org/tmatesoft/hg/internal/AnnotateFacility.java @ 544:7f5998a9619d

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Refactor PatchGenerator to be generic and welcome sequence of any nature
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Fri, 15 Feb 2013 16:48:54 +0100
parents 1e95f48d9886
children 15b406c7cd9d
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;
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18
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19 import static org.tmatesoft.hg.repo.HgRepository.NO_REVISION;
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20
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21 import org.tmatesoft.hg.core.Nodeid;
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22 import org.tmatesoft.hg.internal.PatchGenerator.ChunkSequence;
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23 import org.tmatesoft.hg.internal.PatchGenerator.LineSequence;
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24 import org.tmatesoft.hg.repo.HgDataFile;
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25 import org.tmatesoft.hg.repo.HgInvalidStateException;
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26 import org.tmatesoft.hg.repo.HgRepository;
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27 import org.tmatesoft.hg.util.CancelledException;
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28
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29 /**
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30 *
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31 * @author Artem Tikhomirov
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32 * @author TMate Software Ltd.
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33 */
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34 @Experimental(reason="work in progress")
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35 public class AnnotateFacility {
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36
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37 /**
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38 * Annotates changes of the file against its parent(s)
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39 */
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40 public void annotateChange(HgDataFile df, int changestRevisionIndex, Inspector insp) {
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41 Nodeid fileRev = df.getRepo().getManifest().getFileRevision(changestRevisionIndex, df.getPath());
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42 int fileRevIndex = df.getRevisionIndex(fileRev);
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43 int[] fileRevParents = new int[2];
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44 df.parents(fileRevIndex, fileRevParents, null, null);
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45 if (fileRevParents[0] != NO_REVISION && fileRevParents[1] != NO_REVISION) {
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46 // merge
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47 } else if (fileRevParents[0] == fileRevParents[1]) {
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48 // may be equal iff both are unset
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49 assert fileRevParents[0] == NO_REVISION;
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50 // everything added
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51 insp.added(null);
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52 } else {
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53 int soleParent = fileRevParents[0] == NO_REVISION ? fileRevParents[1] : fileRevParents[0];
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54 assert soleParent != NO_REVISION;
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55 try {
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56 ByteArrayChannel c1, c2;
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57 df.content(soleParent, c1 = new ByteArrayChannel());
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58 df.content(fileRevIndex, c2 = new ByteArrayChannel());
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59 int parentChangesetRevIndex = df.getChangesetRevisionIndex(soleParent);
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60 PatchGenerator<LineSequence> pg = new PatchGenerator<LineSequence>();
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61 pg.init(LineSequence.newlines(c1.toArray()), LineSequence.newlines(c2.toArray()));
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62 pg.findMatchingBlocks(new BlameBlockInspector(insp));
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63 } catch (CancelledException ex) {
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64 // TODO likely it was bad idea to throw cancelled exception from content()
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65 // deprecate and provide alternative?
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66 HgInvalidStateException ise = new HgInvalidStateException("ByteArrayChannel never throws CancelledException");
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67 ise.initCause(ex);
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68 throw ise;
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69 }
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70 }
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71 }
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72
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73 @Callback
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74 public interface Inspector {
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75 void same(Block block);
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76 void added(AddBlock block);
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77 void changed(ChangeBlock block);
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78 void deleted(DeleteBlock block);
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79 }
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80
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81 public interface Block {
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82 // boolean isMergeRevision();
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83 // int fileRevisionIndex();
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84 // int originFileRevisionIndex();
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85 // String[] lines();
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86 // byte[] data();
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87 }
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88
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89 public interface AddBlock extends Block {
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90 int insertedAt(); // line index in the old file
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91 int firstAddedLine();
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92 int totalAddedLines();
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93 String[] addedLines();
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94 }
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95 public interface DeleteBlock extends Block {
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96 int removedAt(); // line index in the new file
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97 int firstRemovedLine();
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98 int totalRemovedLines();
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99 String[] removedLines();
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100 }
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101 public interface ChangeBlock extends AddBlock, DeleteBlock {
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102 }
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103
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104 static class BlameBlockInspector extends PatchGenerator.DeltaInspector<LineSequence> {
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105 private final Inspector insp;
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106
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107 public BlameBlockInspector(Inspector inspector) {
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108 assert inspector != null;
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109 insp = inspector;
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110 }
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111
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112 @Override
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113 protected void changed(int s1From, int s1To, int s2From, int s2To) {
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114 insp.changed(new BlockImpl2(seq1, seq2, s1From, s1To-s1From, s2From, s2To - s2From, s1From, s2From));
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115 }
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116
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117 @Override
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118 protected void added(int s1InsertPoint, int s2From, int s2To) {
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119 insp.added(new BlockImpl2(null, seq2, -1, -1, s2From, s2To - s2From, s1InsertPoint, -1));
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120 }
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121
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122 @Override
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123 protected void deleted(int s2DeletePoint, int s1From, int s1To) {
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124 insp.deleted(new BlockImpl2(seq1, null, s1From, s1To - s1From, -1, -1, -1, s2DeletePoint));
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125 }
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126
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127 @Override
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128 protected void unchanged(int s1From, int s2From, int length) {
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129 insp.same(new BlockImpl(seq2, s2From, length));
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130 }
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131 }
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132
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133 static class BlockImpl implements Block {
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134 private final ChunkSequence seq;
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135 private final int start;
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136 private final int length;
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137
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138 BlockImpl() {
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139 // FIXME delete this cons
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140 seq = null;
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141 start = length = -1;
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142 }
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143
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144 BlockImpl(ChunkSequence s, int blockStart, int blockLength) {
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145 seq = s;
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146 start = blockStart;
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147 length = blockLength;
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148 }
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149
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150 }
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151
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152 static class BlockImpl2 implements ChangeBlock {
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153
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154 private final ChunkSequence oldSeq;
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155 private final ChunkSequence newSeq;
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156 private final int s1Start;
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157 private final int s1Len;
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158 private final int s2Start;
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159 private final int s2Len;
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160 private final int s1InsertPoint;
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161 private final int s2DeletePoint;
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162
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163 public BlockImpl2(ChunkSequence s1, ChunkSequence s2, int s1Start, int s1Len, int s2Start, int s2Len, int s1InsertPoint, int s2DeletePoint) {
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164 oldSeq = s1;
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165 newSeq = s2;
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166 this.s1Start = s1Start;
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167 this.s1Len = s1Len;
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168 this.s2Start = s2Start;
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169 this.s2Len = s2Len;
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170 this.s1InsertPoint = s1InsertPoint;
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171 this.s2DeletePoint = s2DeletePoint;
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172 }
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173
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174 public int insertedAt() {
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175 return s1InsertPoint;
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176 }
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177
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178 public int firstAddedLine() {
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179 return s2Start;
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180 }
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181
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182 public int totalAddedLines() {
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183 return s2Len;
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184 }
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185
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186 public String[] addedLines() {
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187 return generateLines(totalAddedLines(), firstAddedLine());
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188 }
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189
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190 public int removedAt() {
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191 return s2DeletePoint;
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192 }
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193
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194 public int firstRemovedLine() {
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195 return s1Start;
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196 }
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197
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198 public int totalRemovedLines() {
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199 return s1Len;
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200 }
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201
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202 public String[] removedLines() {
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203 return generateLines(totalRemovedLines(), firstRemovedLine());
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204 }
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205
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206 private String[] generateLines(int count, int startFrom) {
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207 String[] rv = new String[count];
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208 for (int i = 0; i < count; i++) {
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209 rv[i] = String.format("LINE %d", startFrom + i+1);
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210 }
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211 return rv;
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212 }
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213 }
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214 }