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annotate src/org/tmatesoft/hg/internal/FileAnnotation.java @ 556:e55f17a7a195

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AnnotateFacility renamed to HgBlameFacility and exposed, API shapes out and got some javadoc
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Fri, 22 Feb 2013 20:21:24 +0100
parents e623aa2ca526
children b9e5ac26dd83
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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ab21ac7dd833 Line-by-line annotation API and support code in place
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17 package org.tmatesoft.hg.internal;
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18
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19 import java.util.LinkedList;
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20
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21 import org.tmatesoft.hg.core.HgIterateDirection;
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22 import org.tmatesoft.hg.repo.HgBlameFacility;
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23 import org.tmatesoft.hg.repo.HgDataFile;
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24 import org.tmatesoft.hg.repo.HgBlameFacility.*;
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25
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26 /**
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27 * Produce output like 'hg annotate' does
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28 *
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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 FileAnnotation implements HgBlameFacility.BlockInspector, RevisionDescriptor.Recipient {
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33
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34 @Experimental(reason="The line-by-line inspector likely to become part of core/command API")
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35 @Callback
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36 public interface LineInspector {
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37 /**
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38 * Not necessarily invoked sequentially by line numbers
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39 */
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40 void line(int lineNumber, int changesetRevIndex, LineDescriptor ld);
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41 }
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42
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43 public interface LineDescriptor {
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44 int totalLines();
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45 }
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46
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47 /**
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48 * Annotate file revision, line by line.
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49 */
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50 public static void annotate(HgDataFile df, int changelogRevisionIndex, LineInspector insp) {
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51 if (!df.exists()) {
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52 return;
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53 }
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54 FileAnnotation fa = new FileAnnotation(insp);
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55 HgBlameFacility af = new HgBlameFacility();
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56 af.annotate(df, changelogRevisionIndex, fa, HgIterateDirection.NewToOld);
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57 }
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58
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59 // blocks deleted in the target, as reported at the previous step
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60 private LinkedList<DeleteBlock> deleted = new LinkedList<DeleteBlock>();
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61 // blocks deleted in the origin, to become deletions in target at the next step
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62 private LinkedList<DeleteBlock> newDeleted = new LinkedList<DeleteBlock>();
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63 // keeps <startSeq1, startSeq2, len> of equal blocks, origin to target, from previous step
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64 // XXX smth like IntSliceVector to access triples (or slices of any size, in fact)
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65 // with easy indexing, e.g. #get(sliceIndex, indexWithinSlice)
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66 // and vect.get(7,2) instead of vect.get(7*SIZEOF_SLICE+2)
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67 private IntVector identical = new IntVector(20 * 3, 2 * 3);
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68 // equal blocks of the current iteration, to be recalculated before next step
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69 // to track line number (current target to ultimate target) mapping
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70 private IntVector newIdentical = new IntVector(20 * 3, 2 * 3);
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71
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72 private boolean[] knownLines;
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73 private final LineInspector delegate;
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74
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75 public FileAnnotation(LineInspector lineInspector) {
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76 delegate = lineInspector;
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77 }
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78
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79 public void start(RevisionDescriptor rd) {
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80 if (knownLines == null) {
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81 knownLines = new boolean[rd.target().elementCount()];
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82 }
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83 }
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84
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85 // private static void ppp(IntVector v) {
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86 // for (int i = 0; i < v.size(); i+= 3) {
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87 // int len = v.get(i+2);
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88 // System.out.printf("[%d..%d) == [%d..%d); ", v.get(i), v.get(i) + len, v.get(i+1), v.get(i+1) + len);
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89 // }
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90 // System.out.println();
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91 // }
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92
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93 public void done(RevisionDescriptor rd) {
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94 if (identical.size() > 0) {
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95 // update line numbers of the intermediate target to point to ultimate target's line numbers
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96 IntVector v = new IntVector(identical.size(), 2 * 3);
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97 for (int i = 0; i < newIdentical.size(); i += 3) {
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98 int originLine = newIdentical.get(i);
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99 int targetLine = newIdentical.get(i + 1);
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100 int length = newIdentical.get(i + 2);
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101 int startTargetLine = -1, startOriginLine = -1, c = 0;
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102 for (int j = 0; j < length; j++) {
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103 int lnInFinal = mapLineIndex(targetLine + j);
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104 if (lnInFinal == -1 || (startTargetLine != -1 && lnInFinal != startTargetLine + c)) {
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105 // the line is not among "same" in ultimate origin
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106 // or belongs to another/next "same" chunk
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107 if (startOriginLine == -1) {
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108 continue;
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109 }
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110 v.add(startOriginLine);
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111 v.add(startTargetLine);
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112 v.add(c);
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113 c = 0;
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114 startOriginLine = startTargetLine = -1;
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115 // fall-through to check if it's not complete miss but a next chunk
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116 }
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117 if (lnInFinal != -1) {
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118 if (startOriginLine == -1) {
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119 startOriginLine = originLine + j;
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120 startTargetLine = lnInFinal;
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121 c = 1;
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122 } else {
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123 assert lnInFinal == startTargetLine + c;
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124 c++;
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125 }
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126 }
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127 }
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128 if (startOriginLine != -1) {
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129 assert c > 0;
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130 v.add(startOriginLine);
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131 v.add(startTargetLine);
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132 v.add(c);
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133 }
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134 }
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135 newIdentical.clear();
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136 identical = v;
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137 } else {
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138 IntVector li = newIdentical;
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139 newIdentical = identical;
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140 identical = li;
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141 }
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142 LinkedList<DeleteBlock> ld = newDeleted;
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143 deleted.clear();
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144 newDeleted = deleted;
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145 deleted = ld;
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146 }
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147
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148 public void same(EqualBlock block) {
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149 newIdentical.add(block.originStart());
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150 newIdentical.add(block.targetStart());
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151 newIdentical.add(block.length());
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152 }
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153
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154 public void added(AddBlock block) {
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155 for (int i = 0, ln = block.firstAddedLine(), x = block.totalAddedLines(); i < x; i++, ln++) {
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156 int lnInFinal = mapLineIndex(ln);
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157 if (lnInFinal != -1 && !knownLines[lnInFinal]) {
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158 delegate.line(lnInFinal, block.targetChangesetIndex(), new LineDescriptorImpl());
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159 knownLines[lnInFinal] = true;
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160 }
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161 }
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162 }
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163
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164 public void changed(ChangeBlock block) {
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165 deleted(block);
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166 added(block);
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167 }
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168
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169 public void deleted(DeleteBlock block) {
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170 newDeleted.add(block);
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171 }
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172
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173 // line - index in the target
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174 private boolean isDeleted(int line) {
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175 for (DeleteBlock b : deleted) {
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176 if (b.firstRemovedLine() > line) {
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177 break;
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178 }
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179 // line >= b.firstRemovedLine
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180 if (b.firstRemovedLine() + b.totalRemovedLines() > line) {
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181 return true;
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182 }
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183 }
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184 return false;
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185 }
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186
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187 // map target lines to the lines of the revision being annotated (the one that came first)
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188 private int mapLineIndex(int ln) {
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189 if (isDeleted(ln)) {
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190 return -1;
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191 }
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192 if (identical.isEmpty()) {
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193 return ln;
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194 }
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195 for (int i = 0; i < identical.size(); i += 3) {
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196 final int originStart = identical.get(i);
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197 if (originStart > ln) {
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198 // assert false;
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199 return -1;
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200 }
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201 // ln >= b.originStart
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202 final int length = identical.get(i + 2);
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203 if (originStart + length > ln) {
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204 int targetStart = identical.get(i + 1);
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205 return targetStart + (ln - originStart);
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206 }
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207 }
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208 // assert false;
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209 return -1;
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210 }
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211
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212 private final class LineDescriptorImpl implements LineDescriptor {
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213 LineDescriptorImpl() {
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214 }
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215
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216 public int totalLines() {
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217 return FileAnnotation.this.knownLines.length;
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218 }
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219 }
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220 }