Mercurial > hg4j

annotate src/org/tmatesoft/hg/core/HgAnnotateCommand.java @ 606:5daa42067e7c

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Avoid mmap files when only few bytes are to be read
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 07 May 2013 14:16:35 +0200
parents 707b5c7c6fa4
children f41dd9a3b8af
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.core;
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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 java.util.Arrays;
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22
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23 import org.tmatesoft.hg.internal.Callback;
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24 import org.tmatesoft.hg.internal.CsetParamKeeper;
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25 import org.tmatesoft.hg.internal.Experimental;
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26 import org.tmatesoft.hg.internal.FileAnnotation;
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27 import org.tmatesoft.hg.internal.FileAnnotation.LineDescriptor;
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28 import org.tmatesoft.hg.internal.FileAnnotation.LineInspector;
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29 import org.tmatesoft.hg.repo.HgBlameInspector.BlockData;
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30 import org.tmatesoft.hg.repo.HgDataFile;
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31 import org.tmatesoft.hg.repo.HgRepository;
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32 import org.tmatesoft.hg.util.CancelSupport;
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33 import org.tmatesoft.hg.util.CancelledException;
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34 import org.tmatesoft.hg.util.Path;
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35 import org.tmatesoft.hg.util.ProgressSupport;
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36
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37 /**
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38 * WORK IN PROGRESS. UNSTABLE API
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39 *
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40 * 'hg annotate' counterpart, report origin revision and file line-by-line
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41 *
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42 * @author Artem Tikhomirov
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43 * @author TMate Software Ltd.
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44 * @since 1.1
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45 */
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46 @Experimental(reason="Work in progress. Unstable API")
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47 public class HgAnnotateCommand extends HgAbstractCommand<HgAnnotateCommand> {
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48
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49 private final HgRepository repo;
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50 private final CsetParamKeeper annotateRevision;
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51 private Path file;
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52 private boolean followRename;
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53
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54 public HgAnnotateCommand(HgRepository hgRepo) {
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55 repo = hgRepo;
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56 annotateRevision = new CsetParamKeeper(repo);
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57 annotateRevision.doSet(HgRepository.TIP);
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58 }
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59
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60 public HgAnnotateCommand changeset(Nodeid nodeid) throws HgBadArgumentException {
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61 annotateRevision.set(nodeid);
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62 return this;
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63 }
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64
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65 public HgAnnotateCommand changeset(int changelogRevIndex) throws HgBadArgumentException {
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66 annotateRevision.set(changelogRevIndex);
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67 return this;
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68 }
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69
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70 /**
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71 * Select file to annotate, origin of renamed/copied file would be followed, too.
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72 *
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73 * @param filePath path relative to repository root
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74 * @return <code>this</code> for convenience
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75 */
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76 public HgAnnotateCommand file(Path filePath) {
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77 return file(filePath, true);
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78 }
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79
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80 /**
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81 * Select file to annotate.
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82 *
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83 * @param filePath path relative to repository root
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84 * @param followCopyRename true to follow copies/renames.
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85 * @return <code>this</code> for convenience
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86 */
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87 public HgAnnotateCommand file(Path filePath, boolean followCopyRename) {
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88 file = filePath;
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89 followRename = followCopyRename;
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90 return this;
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91 }
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92
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93 // TODO [1.1] set encoding and provide String line content from LineInfo
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94
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95 /**
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96 * Annotate selected file
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97 *
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98 * @param inspector
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99 * @throws HgException subclass thereof to indicate specific issue with the command arguments or repository state
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100 * @throws HgCallbackTargetException
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101 * @throws CancelledException if execution of the command was cancelled
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102 */
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103 public void execute(Inspector inspector) throws HgException, HgCallbackTargetException, CancelledException {
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104 if (inspector == null) {
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105 throw new IllegalArgumentException();
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106 }
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107 if (file == null) {
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108 throw new HgBadArgumentException("Command needs file argument", null);
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109 }
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110 final ProgressSupport progress = getProgressSupport(inspector);
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111 final CancelSupport cancellation = getCancelSupport(inspector, true);
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112 cancellation.checkCancelled();
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113 progress.start(2);
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114 HgDataFile df = repo.getFileNode(file);
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115 if (!df.exists()) {
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116 return;
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117 }
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118 final int changesetStart = followRename ? 0 : df.getChangesetRevisionIndex(0);
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119 Collector c = new Collector(cancellation);
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120 FileAnnotation fa = new FileAnnotation(c);
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121 df.annotate(changesetStart, annotateRevision.get(), fa, HgIterateDirection.NewToOld);
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122 progress.worked(1);
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123 c.throwIfCancelled();
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124 cancellation.checkCancelled();
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125 ProgressSupport.Sub subProgress = new ProgressSupport.Sub(progress, 1);
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126 subProgress.start(c.lineRevisions.length);
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127 LineImpl li = new LineImpl();
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128 for (int i = 0; i < c.lineRevisions.length; i++) {
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129 li.init(i+1, c.lineRevisions[i], c.line(i));
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130 inspector.next(li);
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131 subProgress.worked(1);
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132 cancellation.checkCancelled();
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133 }
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134 subProgress.done();
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135 progress.done();
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136 }
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137
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138 /**
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139 * Callback to receive annotated lines
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140 */
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141 @Callback
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142 public interface Inspector {
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143 // start(FileDescriptor) throws HgCallbackTargetException;
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144 void next(LineInfo lineInfo) throws HgCallbackTargetException;
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145 // end(FileDescriptor) throws HgCallbackTargetException;
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146 }
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147
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148 /**
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149 * Describes a line reported through {@link Inspector#next(LineInfo)}
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150 *
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151 * Clients shall not implement this interface
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152 */
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153 public interface LineInfo {
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154 int getLineNumber();
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155 int getChangesetIndex();
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156 byte[] getContent();
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157 }
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158
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159 // FIXME there's no need in FileAnnotation.LineInspector, merge it here
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160 private static class Collector implements LineInspector {
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161 private int[] lineRevisions;
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162 private byte[][] lines;
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163 private final CancelSupport cancelSupport;
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164 private CancelledException cancelEx;
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165
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166 Collector(CancelSupport cancellation) {
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167 cancelSupport = cancellation;
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168 }
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169
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170 public void line(int lineNumber, int changesetRevIndex, BlockData lineContent, LineDescriptor ld) {
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171 if (cancelEx != null) {
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172 return;
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173 }
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174 if (lineRevisions == null) {
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175 lineRevisions = new int [ld.totalLines()];
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176 Arrays.fill(lineRevisions, NO_REVISION);
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177 lines = new byte[ld.totalLines()][];
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178 }
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179 lineRevisions[lineNumber] = changesetRevIndex;
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180 lines[lineNumber] = lineContent.asArray();
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181 try {
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182 cancelSupport.checkCancelled();
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183 } catch (CancelledException ex) {
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184 cancelEx = ex;
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185 }
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186 }
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187
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188 public byte[] line(int i) {
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189 return lines[i];
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190 }
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191
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192 public void throwIfCancelled() throws CancelledException {
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193 if (cancelEx != null) {
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194 throw cancelEx;
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195 }
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196 }
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197 }
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198
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199
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200 private static class LineImpl implements LineInfo {
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201 private int ln;
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202 private int rev;
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203 private byte[] content;
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204
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205 void init(int line, int csetRev, byte[] cnt) {
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206 ln = line;
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207 rev = csetRev;
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208 content = cnt;
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209 }
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210
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211 public int getLineNumber() {
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212 return ln;
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213 }
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214
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215 public int getChangesetIndex() {
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216 return rev;
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217 }
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218
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219 public byte[] getContent() {
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220 return content;
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221 }
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222 }
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223 }