Mercurial > hg4j
annotate src/org/tmatesoft/hg/repo/HgDataFile.java @ 690:b286222158be
Fix file.isCopy() use for status and cat commands
author | Artem Tikhomirov <tikhomirov.artem@gmail.com> |
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date | Thu, 01 Aug 2013 21:45:47 +0200 |
parents | 5050ee565bd1 |
children | 7efabe0cddcf |
rev | line source |
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Query file for its parents. Demo of recently added ignore and digest support from within cat cmd
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1 /* |
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2 * Copyright (c) 2010-2013 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.repo; |
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18 |
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Use 'revision index' instead of the vague 'local revision number' concept in the API
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19 import static org.tmatesoft.hg.repo.HgInternals.wrongRevisionIndex; |
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20 import static org.tmatesoft.hg.repo.HgRepository.*; |
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21 import static org.tmatesoft.hg.util.LogFacility.Severity.Info; |
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22 |
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Allow access to working copy content through HgDataFile. Give access to repository's working dir
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23 import java.io.File; |
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24 import java.io.FileInputStream; |
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25 import java.io.IOException; |
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26 import java.nio.ByteBuffer; |
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27 import java.nio.channels.FileChannel; |
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Do not expect file history to be ordered
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28 import java.util.Arrays; |
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Skip metadata in the beginning of a file content. Parse metadata, recognize copies/renames
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29 |
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30 import org.tmatesoft.hg.core.HgChangesetFileSneaker; |
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Issue 44: Renames/copies other than for the very first revision of a file are not recognized
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31 import org.tmatesoft.hg.core.HgFileRevision; |
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32 import org.tmatesoft.hg.core.Nodeid; |
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33 import org.tmatesoft.hg.internal.DataAccess; |
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Close FIS, not FileChannel, to clear both references to FileDescriptor right away
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34 import org.tmatesoft.hg.internal.FileUtils; |
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Conditionally apply filters to file content
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35 import org.tmatesoft.hg.internal.FilterByteChannel; |
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36 import org.tmatesoft.hg.internal.FilterDataAccess; |
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37 import org.tmatesoft.hg.internal.Internals; |
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38 import org.tmatesoft.hg.internal.Metadata; |
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39 import org.tmatesoft.hg.internal.RevlogStream; |
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40 import org.tmatesoft.hg.util.ByteChannel; |
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41 import org.tmatesoft.hg.util.CancelSupport; |
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42 import org.tmatesoft.hg.util.CancelledException; |
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43 import org.tmatesoft.hg.util.LogFacility; |
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44 import org.tmatesoft.hg.util.Pair; |
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45 import org.tmatesoft.hg.util.Path; |
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46 import org.tmatesoft.hg.util.ProgressSupport; |
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47 |
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48 |
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49 /** |
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50 * Regular user data file stored in the repository. |
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51 * |
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52 * <p> Note, most methods accept index in the file's revision history, not that of changelog. Easy way to obtain |
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53 * changeset revision index from file's is to use {@link #getChangesetRevisionIndex(int)}. To obtain file's revision |
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54 * index for a given changeset, {@link HgManifest#getFileRevision(int, Path)} or {@link HgChangesetFileSneaker} may |
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55 * come handy. |
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56 * |
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57 * @author Artem Tikhomirov |
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58 * @author TMate Software Ltd. |
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59 */ |
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60 public final class HgDataFile extends Revlog { |
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61 |
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62 // absolute from repo root? |
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63 // slashes, unix-style? |
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64 // repo location agnostic, just to give info to user, not to access real storage |
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65 private final Path path; |
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66 private Metadata metadata; // get initialized on first access to file content. |
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67 |
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68 /*package-local*/HgDataFile(HgRepository hgRepo, Path filePath, RevlogStream content) { |
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69 super(hgRepo, content, false); |
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70 path = filePath; |
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71 } |
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72 |
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73 // exists is not the best name possible. now it means no file with such name was ever known to the repo. |
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74 // it might be confused with files existed before but lately removed. TODO HgFileNode.exists makes more sense. |
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75 // or HgDataFile.known() |
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76 public boolean exists() { |
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77 return content.exists(); |
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78 } |
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79 |
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80 /** |
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81 * Human-readable file name, i.e. "COPYING", not "store/data/_c_o_p_y_i_n_g.i" |
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82 */ |
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83 public Path getPath() { |
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84 return path; // hgRepo.backresolve(this) -> name? In this case, what about hashed long names? |
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85 } |
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86 |
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87 /** |
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88 * Handy shorthand for {@link #getLength(int) length(getRevisionIndex(nodeid))} |
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89 * |
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90 * @param nodeid revision of the file |
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91 * |
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92 * @return size of the file content at the given revision |
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93 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em> |
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94 */ |
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95 public int getLength(Nodeid nodeid) throws HgRuntimeException { |
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96 try { |
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97 return getLength(getRevisionIndex(nodeid)); |
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98 } catch (HgInvalidControlFileException ex) { |
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99 throw ex.isRevisionSet() ? ex : ex.setRevision(nodeid); |
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100 } catch (HgInvalidRevisionException ex) { |
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101 throw ex.isRevisionSet() ? ex : ex.setRevision(nodeid); |
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102 } |
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103 } |
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104 |
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105 /** |
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106 * @param fileRevisionIndex - revision local index, non-negative. From predefined constants, only {@link HgRepository#TIP} makes sense. |
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107 * @return size of the file content at the revision identified by local revision number. |
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108 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em> |
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109 */ |
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110 public int getLength(int fileRevisionIndex) throws HgRuntimeException { |
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111 if (wrongRevisionIndex(fileRevisionIndex) || fileRevisionIndex == BAD_REVISION) { |
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112 throw new HgInvalidRevisionException(fileRevisionIndex); |
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113 } |
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114 if (fileRevisionIndex == TIP) { |
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115 fileRevisionIndex = getLastRevision(); |
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116 } else if (fileRevisionIndex == WORKING_COPY) { |
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117 File f = getRepo().getFile(this); |
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118 if (f.exists()) { |
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119 // single revision can't be greater than 2^32, shall be safe to cast to int |
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120 return Internals.ltoi(f.length()); |
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121 } |
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122 Nodeid fileRev = getWorkingCopyRevision(); |
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123 if (fileRev == null) { |
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124 throw new HgInvalidRevisionException(String.format("File %s is not part of working copy", getPath()), null, fileRevisionIndex); |
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125 } |
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126 fileRevisionIndex = getRevisionIndex(fileRev); |
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127 } |
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128 if (metadata == null || !metadata.checked(fileRevisionIndex)) { |
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129 checkAndRecordMetadata(fileRevisionIndex); |
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130 } |
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131 final int dataLen = content.dataLength(fileRevisionIndex); |
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132 if (metadata.known(fileRevisionIndex)) { |
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133 return dataLen - metadata.dataOffset(fileRevisionIndex); |
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134 } |
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135 return dataLen; |
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136 } |
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137 |
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138 /** |
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139 * Reads content of the file from working directory. If file present in the working directory, its actual content without |
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140 * any filters is supplied through the sink. If file does not exist in the working dir, this method provides content of a file |
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141 * as if it would be refreshed in the working copy, i.e. its corresponding revision (according to dirstate) is read from the |
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142 * repository, and filters repo -> working copy get applied. |
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143 * |
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144 * NOTE, if file is missing from the working directory and is not part of the dirstate (but otherwise legal repository file, |
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145 * e.g. from another branch), no content would be supplied. |
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146 * |
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147 * @param sink content consumer |
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148 * @throws CancelledException if execution of the operation was cancelled |
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149 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em> |
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150 */ |
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151 public void workingCopy(ByteChannel sink) throws CancelledException, HgRuntimeException { |
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152 File f = getRepo().getFile(this); |
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153 if (f.exists()) { |
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154 final CancelSupport cs = CancelSupport.Factory.get(sink); |
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155 final ProgressSupport progress = ProgressSupport.Factory.get(sink); |
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156 final long flength = f.length(); |
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157 final int bsize = (int) Math.min(flength, 32*1024); |
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158 progress.start((int) (flength > Integer.MAX_VALUE ? flength >>> 15 /*32 kb buf size*/ : flength)); |
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159 ByteBuffer buf = ByteBuffer.allocate(bsize); |
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160 FileInputStream fis = null; |
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161 try { |
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162 fis = new FileInputStream(f); |
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163 FileChannel fc = fis.getChannel(); |
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164 while (fc.read(buf) != -1) { |
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165 cs.checkCancelled(); |
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166 buf.flip(); |
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167 int consumed = sink.write(buf); |
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168 progress.worked(flength > Integer.MAX_VALUE ? 1 : consumed); |
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169 buf.compact(); |
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170 } |
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171 } catch (IOException ex) { |
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172 throw new HgInvalidFileException("Working copy read failed", ex, f); |
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173 } finally { |
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174 progress.done(); |
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175 if (fis != null) { |
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176 new FileUtils(getRepo().getSessionContext().getLog(), this).closeQuietly(fis); |
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177 } |
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178 } |
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179 } else { |
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180 Nodeid fileRev = getWorkingCopyRevision(); |
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181 if (fileRev == null) { |
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182 // no content for this data file in the working copy - it is not part of the actual working state. |
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183 // XXX perhaps, shall report this to caller somehow, not silently pass no data? |
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184 return; |
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185 } |
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186 final int fileRevIndex = getRevisionIndex(fileRev); |
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187 contentWithFilters(fileRevIndex, sink); |
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188 } |
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189 } |
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190 |
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191 /** |
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192 * @return file revision as recorded in repository manifest for dirstate parent, or <code>null</code> if no file revision can be found |
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193 * @throws HgInvalidControlFileException if failed to access revlog index/data entry. <em>Runtime exception</em> |
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194 * @throws HgRuntimeException subclass thereof to indicate other issues with the library. <em>Runtime exception</em> |
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195 */ |
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196 private Nodeid getWorkingCopyRevision() throws HgRuntimeException { |
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197 final Pair<Nodeid, Nodeid> wcParents = getRepo().getWorkingCopyParents(); |
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198 Nodeid p = wcParents.first().isNull() ? wcParents.second() : wcParents.first(); |
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199 final HgChangelog clog = getRepo().getChangelog(); |
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200 final int csetRevIndex; |
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201 if (p.isNull()) { |
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202 // no dirstate parents |
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203 getRepo().getSessionContext().getLog().dump(getClass(), Info, "No dirstate parents, resort to TIP", getPath()); |
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204 // if it's a repository with no dirstate, use TIP then |
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205 csetRevIndex = clog.getLastRevision(); |
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206 if (csetRevIndex == -1) { |
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207 // shall not happen provided there's .i for this data file (hence at least one cset) |
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208 // and perhaps exception is better here. However, null as "can't find" indication seems reasonable. |
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209 return null; |
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210 } |
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211 } else { |
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212 // common case to avoid searching complete changelog for nodeid match |
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213 final Nodeid tipRev = clog.getRevision(TIP); |
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214 if (tipRev.equals(p)) { |
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215 csetRevIndex = clog.getLastRevision(); |
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216 } else { |
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217 // bad luck, need to search honestly |
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218 csetRevIndex = clog.getRevisionIndex(p); |
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219 } |
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220 } |
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221 Nodeid fileRev = getRepo().getManifest().getFileRevision(csetRevIndex, getPath()); |
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222 // it's possible for a file to be in working dir and have store/.i but to belong e.g. to a different |
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223 // branch than the one from dirstate. Thus it's possible to get null fileRev |
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224 // which would serve as an indication this data file is not part of working copy |
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225 return fileRev; |
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226 } |
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227 |
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228 /** |
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229 * Access content of a file revision |
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230 * XXX not sure distinct method contentWithFilters() is the best way to do, perhaps, callers shall add filters themselves? |
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231 * |
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232 * @param fileRevisionIndex - revision local index, non-negative. From predefined constants, {@link HgRepository#TIP} and {@link HgRepository#WORKING_COPY} make sense. |
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233 * @param sink content consumer |
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234 * |
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235 * @throws CancelledException if execution of the operation was cancelled |
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236 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em> |
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237 */ |
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238 public void contentWithFilters(int fileRevisionIndex, ByteChannel sink) throws CancelledException, HgRuntimeException { |
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239 if (fileRevisionIndex == WORKING_COPY) { |
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240 workingCopy(sink); // pass un-mangled sink |
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241 } else { |
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242 content(fileRevisionIndex, new FilterByteChannel(sink, getRepo().getFiltersFromRepoToWorkingDir(getPath()))); |
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243 } |
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244 } |
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245 |
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246 /** |
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247 * Retrieve content of specific revision. Content is provided as is, without any filters (e.g. keywords, eol, etc.) applied. |
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248 * For filtered content, use {@link #contentWithFilters(int, ByteChannel)}. |
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249 * |
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250 * @param fileRevisionIndex - revision local index, non-negative. From predefined constants, {@link HgRepository#TIP} and {@link HgRepository#WORKING_COPY} make sense. |
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251 * @param sink content consumer |
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252 * |
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253 * @throws CancelledException if execution of the operation was cancelled |
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254 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em> |
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255 */ |
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256 public void content(int fileRevisionIndex, ByteChannel sink) throws CancelledException, HgRuntimeException { |
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257 // for data files need to check heading of the file content for possible metadata |
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258 // @see http://mercurial.selenic.com/wiki/FileFormats#data.2BAC8- |
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259 if (fileRevisionIndex == TIP) { |
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260 fileRevisionIndex = getLastRevision(); |
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261 } |
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262 if (fileRevisionIndex == WORKING_COPY) { |
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263 // sink is supposed to come into workingCopy without filters |
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264 // thus we shall not get here (into #content) from #contentWithFilters(WC) |
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265 workingCopy(sink); |
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266 return; |
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267 } |
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268 if (wrongRevisionIndex(fileRevisionIndex) || fileRevisionIndex == BAD_REVISION) { |
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269 throw new HgInvalidRevisionException(fileRevisionIndex); |
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270 } |
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271 if (sink == null) { |
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272 throw new IllegalArgumentException(); |
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273 } |
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274 if (metadata == null) { |
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275 metadata = new Metadata(getRepo()); |
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276 } |
277
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277 ErrorHandlingInspector insp; |
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278 final LogFacility lf = getRepo().getSessionContext().getLog(); |
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279 if (metadata.none(fileRevisionIndex)) { |
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280 insp = new ContentPipe(sink, 0, lf); |
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281 } else if (metadata.known(fileRevisionIndex)) { |
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282 insp = new ContentPipe(sink, metadata.dataOffset(fileRevisionIndex), lf); |
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283 } else { |
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284 // do not know if there's metadata |
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285 insp = new MetadataInspector(metadata, new ContentPipe(sink, 0, lf)); |
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286 } |
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287 insp.checkCancelled(); |
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288 super.content.iterate(fileRevisionIndex, fileRevisionIndex, true, insp); |
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289 try { |
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290 insp.checkFailed(); |
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291 } catch (HgInvalidControlFileException ex) { |
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292 ex = ex.setFileName(getPath()); |
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293 throw ex.isRevisionIndexSet() ? ex : ex.setRevisionIndex(fileRevisionIndex); |
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294 } catch (IOException ex) { |
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295 HgInvalidControlFileException e = new HgInvalidControlFileException("Revision content access failed", ex, null); |
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296 throw content.initWithIndexFile(e).setFileName(getPath()).setRevisionIndex(fileRevisionIndex); |
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297 } |
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298 } |
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299 |
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300 /** |
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301 * Walk complete change history of the file. |
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302 * @param inspector callback to visit changesets |
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303 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em> |
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304 */ |
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305 public void history(HgChangelog.Inspector inspector) throws HgRuntimeException { |
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306 history(0, getLastRevision(), inspector); |
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307 } |
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308 |
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309 /** |
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310 * Walk subset of the file's change history. |
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311 * @param start revision local index, inclusive; non-negative or {@link HgRepository#TIP} |
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312 * @param end revision local index, inclusive; non-negative or {@link HgRepository#TIP} |
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313 * @param inspector callback to visit changesets |
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314 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em> |
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315 */ |
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316 public void history(int start, int end, HgChangelog.Inspector inspector) throws HgRuntimeException { |
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317 if (!exists()) { |
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318 throw new IllegalStateException("Can't get history of invalid repository file node"); |
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319 } |
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320 final int last = getLastRevision(); |
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321 if (end == TIP) { |
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322 end = last; |
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323 } |
300
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324 if (start == TIP) { |
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325 start = last; |
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326 } |
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327 HgInternals.checkRevlogRange(start, end, last); |
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328 |
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329 final int[] commitRevisions = new int[end - start + 1]; |
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330 final boolean[] needsSorting = { false }; |
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331 RevlogStream.Inspector insp = new RevlogStream.Inspector() { |
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332 int count = 0; |
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333 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess data) { |
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334 if (count > 0) { |
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335 if (commitRevisions[count -1] > linkRevision) { |
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336 needsSorting[0] = true; |
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337 } |
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338 } |
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339 commitRevisions[count++] = linkRevision; |
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340 } |
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341 }; |
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342 content.iterate(start, end, false, insp); |
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343 final HgChangelog changelog = getRepo().getChangelog(); |
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344 if (needsSorting[0]) { |
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345 // automatic tools (svnmerge?) produce unnatural file history |
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346 // (e.g. cpython/Lib/doctest.py, revision 164 points to cset 63509, 165 - to 38453) |
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347 Arrays.sort(commitRevisions); |
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348 } |
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349 changelog.rangeInternal(inspector, commitRevisions); |
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350 } |
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351 |
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352 /** |
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353 * For a given revision of the file (identified with revision index), find out index of the corresponding changeset. |
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354 * |
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355 * @return changeset revision index |
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356 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em> |
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357 */ |
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358 public int getChangesetRevisionIndex(int fileRevisionIndex) throws HgRuntimeException { |
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359 return content.linkRevision(fileRevisionIndex); |
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360 } |
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361 |
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362 /** |
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363 * Complements {@link #getChangesetRevisionIndex(int)} to get changeset revision that corresponds to supplied file revision |
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364 * |
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365 * @param nid revision of the file |
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366 * @return changeset revision |
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367 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em> |
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368 */ |
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369 public Nodeid getChangesetRevision(Nodeid nid) throws HgRuntimeException { |
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370 int changelogRevision = getChangesetRevisionIndex(getRevisionIndex(nid)); |
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371 return getRepo().getChangelog().getRevision(changelogRevision); |
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372 } |
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373 |
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374 /** |
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375 * Tells whether first revision of this file originates from another repository file. |
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376 * This method is shorthand for {@link #isCopy(int) isCopy(0)} and it's advised to use {@link #isCopy(int)} instead. |
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377 * |
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378 * @return <code>true</code> if first revision of this file is a copy of some other from the repository |
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379 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em> |
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380 */ |
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381 public boolean isCopy() throws HgRuntimeException { |
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382 return isCopy(0); |
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383 } |
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384 |
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385 /** |
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386 * Get name of the file first revision of this one was copied from. |
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387 * Note, it's better to use {@link #getCopySource(int)} instead. |
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388 * |
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389 * @return name of the file origin |
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390 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em> |
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391 */ |
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392 public Path getCopySourceName() throws HgRuntimeException { |
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393 if (isCopy()) { |
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394 Path.Source ps = getRepo().getSessionContext().getPathFactory(); |
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395 return ps.path(metadata.find(0, "copy")); |
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396 } |
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397 throw new UnsupportedOperationException(); // XXX REVISIT, think over if Exception is good (clients would check isCopy() anyway, perhaps null is sufficient?) |
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398 } |
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399 |
415
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400 /** |
689
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401 * Use {@link #getCopySource(int)} instead |
415
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402 * @return revision this file was copied from |
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403 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em> |
415
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404 */ |
425
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405 public Nodeid getCopySourceRevision() throws HgRuntimeException { |
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406 if (isCopy()) { |
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407 return Nodeid.fromAscii(metadata.find(0, "copyrev")); // XXX reuse/cache Nodeid |
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408 } |
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409 throw new UnsupportedOperationException(); |
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410 } |
689
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411 |
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412 /** |
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413 * Tell if specified file revision was created by copying or renaming another file |
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414 * |
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415 * @param fileRevisionIndex index of file revision to check |
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416 * @return <code>true</code> if this revision originates (as a result of copy/rename) from another file |
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417 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em> |
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418 * @since 1.2 |
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419 */ |
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420 public boolean isCopy(int fileRevisionIndex) throws HgRuntimeException { |
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421 if (fileRevisionIndex == TIP) { |
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422 fileRevisionIndex = getLastRevision(); |
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423 } |
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424 if (wrongRevisionIndex(fileRevisionIndex) || fileRevisionIndex == BAD_REVISION || fileRevisionIndex == WORKING_COPY || fileRevisionIndex == NO_REVISION) { |
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425 throw new HgInvalidRevisionException(fileRevisionIndex); |
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426 } |
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427 |
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428 if (metadata == null || !metadata.checked(fileRevisionIndex)) { |
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429 checkAndRecordMetadata(fileRevisionIndex); |
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430 } |
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431 if (!metadata.known(fileRevisionIndex)) { |
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432 return false; |
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433 } |
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434 return metadata.find(fileRevisionIndex, "copy") != null; |
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435 } |
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436 |
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437 /** |
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438 * Find out which file and which revision of that file given revision originates from |
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439 * |
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440 * @param fileRevisionIndex file revision index of interest, it's assumed {@link #isCopy(int)} for the same revision is <code>true</code> |
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441 * @return origin revision descriptor |
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442 * @throws HgRuntimeException |
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443 * @throws UnsupportedOperationException if specified revision is not a {@link #isCopy(int) copy} revision |
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444 * @since 1.2 |
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445 */ |
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446 public HgFileRevision getCopySource(int fileRevisionIndex) throws HgRuntimeException { |
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447 if (fileRevisionIndex == TIP) { |
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448 fileRevisionIndex = getLastRevision(); |
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449 } |
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450 if (!isCopy(fileRevisionIndex)) { |
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451 throw new UnsupportedOperationException(); |
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452 } |
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453 Path.Source ps = getRepo().getSessionContext().getPathFactory(); |
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454 Path origin = ps.path(metadata.find(fileRevisionIndex, "copy")); |
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455 Nodeid originRev = Nodeid.fromAscii(metadata.find(fileRevisionIndex, "copyrev")); // XXX reuse/cache Nodeid |
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456 return new HgFileRevision(getRepo(), originRev, null, origin); |
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457 } |
417
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458 |
415
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459 /** |
417
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460 * Get file flags recorded in the manifest |
416
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461 * @param fileRevisionIndex - revision local index, non-negative, or {@link HgRepository#TIP}. |
417
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462 * @see HgManifest#getFileFlags(int, Path) |
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463 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em> |
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464 */ |
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465 public HgManifest.Flags getFlags(int fileRevisionIndex) throws HgRuntimeException { |
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466 int changesetRevIndex = getChangesetRevisionIndex(fileRevisionIndex); |
417
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467 return getRepo().getManifest().getFileFlags(changesetRevIndex, getPath()); |
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468 } |
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469 |
88
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470 @Override |
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471 public String toString() { |
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472 StringBuilder sb = new StringBuilder(getClass().getSimpleName()); |
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473 sb.append('('); |
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474 sb.append(getPath()); |
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475 sb.append(')'); |
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476 return sb.toString(); |
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477 } |
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478 |
628
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479 private void checkAndRecordMetadata(int localRev) throws HgRuntimeException { |
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480 if (metadata == null) { |
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481 metadata = new Metadata(getRepo()); |
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482 } |
495
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483 // use MetadataInspector without delegate to process metadata only |
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484 RevlogStream.Inspector insp = new MetadataInspector(metadata, null); |
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485 super.content.iterate(localRev, localRev, true, insp); |
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486 } |
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487 |
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488 private static class MetadataInspector extends ErrorHandlingInspector implements RevlogStream.Inspector { |
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489 private final Metadata metadata; |
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490 private final RevlogStream.Inspector delegate; |
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491 |
495
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492 /** |
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493 * @param _metadata never <code>null</code> |
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494 * @param chain <code>null</code> if no further data processing other than metadata is desired |
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495 */ |
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496 public MetadataInspector(Metadata _metadata, RevlogStream.Inspector chain) { |
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497 metadata = _metadata; |
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498 delegate = chain; |
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499 setCancelSupport(CancelSupport.Factory.get(chain)); |
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500 } |
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501 |
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502 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess data) throws HgRuntimeException { |
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503 try { |
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504 if (metadata.tryRead(revisionNumber, data)) { |
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505 // da is in prepared state (i.e. we consumed all bytes up to metadata end). |
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506 // However, it's not safe to assume delegate won't call da.reset() for some reason, |
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507 // and we need to ensure predictable result. |
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508 data.reset(); |
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509 int offset = metadata.dataOffset(revisionNumber); |
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510 data = new FilterDataAccess(data, offset, data.length() - offset); |
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511 } else { |
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512 data.reset(); |
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513 } |
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514 if (delegate != null) { |
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515 delegate.next(revisionNumber, actualLen, baseRevision, linkRevision, parent1Revision, parent2Revision, nodeid, data); |
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516 } |
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517 } catch (IOException ex) { |
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518 recordFailure(ex); |
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519 } catch (HgInvalidControlFileException ex) { |
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520 recordFailure(ex.isRevisionIndexSet() ? ex : ex.setRevisionIndex(revisionNumber)); |
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521 } |
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522 } |
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523 |
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524 @Override |
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525 public void checkFailed() throws HgRuntimeException, IOException, CancelledException { |
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526 super.checkFailed(); |
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527 if (delegate instanceof ErrorHandlingInspector) { |
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528 // TODO need to add ErrorDestination (ErrorTarget/Acceptor?) and pass it around (much like CancelSupport get passed) |
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529 // so that delegate would be able report its failures directly to caller without this hack |
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530 ((ErrorHandlingInspector) delegate).checkFailed(); |
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531 } |
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532 } |
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533 } |
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534 } |