Mercurial > jhg

annotate src/org/tmatesoft/hg/repo/HgDataFile.java @ 515:e6c8b9b654b2

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Provide access to HgDataFile being iterated into HgChangesetTreeHandler.TreeElement to give context for renamed files
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Mon, 17 Dec 2012 20:51:12 +0100
parents abfbe81154b5
children e4ee4bf4c7d0
rev   line source
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1 /*
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2 * Copyright (c) 2010-2012 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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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.*;
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23 import java.io.ByteArrayOutputStream;
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24 import java.io.File;
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25 import java.io.FileInputStream;
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26 import java.io.IOException;
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27 import java.nio.ByteBuffer;
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28 import java.nio.channels.FileChannel;
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29 import java.util.ArrayList;
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30 import java.util.Arrays;
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31 import java.util.Collection;
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32
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33 import org.tmatesoft.hg.core.HgChangesetFileSneaker;
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34 import org.tmatesoft.hg.core.Nodeid;
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35 import org.tmatesoft.hg.internal.DataAccess;
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36 import org.tmatesoft.hg.internal.FilterByteChannel;
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37 import org.tmatesoft.hg.internal.FilterDataAccess;
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38 import org.tmatesoft.hg.internal.IntMap;
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39 import org.tmatesoft.hg.internal.Internals;
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40 import org.tmatesoft.hg.internal.RevlogStream;
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41 import org.tmatesoft.hg.util.ByteChannel;
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42 import org.tmatesoft.hg.util.CancelSupport;
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43 import org.tmatesoft.hg.util.CancelledException;
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44 import org.tmatesoft.hg.util.LogFacility;
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45 import org.tmatesoft.hg.util.Pair;
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46 import org.tmatesoft.hg.util.Path;
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47 import org.tmatesoft.hg.util.ProgressSupport;
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48
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49
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50 /**
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51 * Regular user data file stored in the repository.
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52 *
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53 * <p> Note, most methods accept index in the file's revision history, not that of changelog. Easy way to obtain
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54 * changeset revision index from file's is to use {@link #getChangesetRevisionIndex(int)}. To obtain file's revision
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55 * index for a given changeset, {@link HgManifest#getFileRevision(int, Path)} or {@link HgChangesetFileSneaker} may
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56 * come handy.
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57 *
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58 * @author Artem Tikhomirov
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59 * @author TMate Software Ltd.
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60 */
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61 public final class HgDataFile extends Revlog {
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62
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63 // absolute from repo root?
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64 // slashes, unix-style?
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65 // repo location agnostic, just to give info to user, not to access real storage
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66 private final Path path;
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67 private Metadata metadata; // get initialized on first access to file content.
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69 /*package-local*/HgDataFile(HgRepository hgRepo, Path filePath, RevlogStream content) {
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70 super(hgRepo, content);
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71 path = filePath;
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72 }
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74 /*package-local*/HgDataFile(HgRepository hgRepo, Path filePath) {
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75 super(hgRepo);
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76 path = filePath;
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77 }
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79 // 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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80 // it might be confused with files existed before but lately removed. TODO HgFileNode.exists makes more sense.
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81 // or HgDataFile.known()
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82 public boolean exists() {
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83 return content != null; // XXX need better impl
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84 }
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86 /**
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87 * Human-readable file name, i.e. "COPYING", not "store/data/_c_o_p_y_i_n_g.i"
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88 */
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89 public Path getPath() {
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90 return path; // hgRepo.backresolve(this) -> name? In this case, what about hashed long names?
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91 }
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93 /**
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94 * Handy shorthand for {@link #getLength(int) length(getRevisionIndex(nodeid))}
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95 *
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96 * @param nodeid revision of the file
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97 *
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98 * @return size of the file content at the given revision
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99 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em>
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100 */
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101 public int getLength(Nodeid nodeid) throws HgRuntimeException {
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102 try {
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103 return getLength(getRevisionIndex(nodeid));
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104 } catch (HgInvalidControlFileException ex) {
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105 throw ex.isRevisionSet() ? ex : ex.setRevision(nodeid);
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106 } catch (HgInvalidRevisionException ex) {
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107 throw ex.isRevisionSet() ? ex : ex.setRevision(nodeid);
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108 }
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109 }
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111 /**
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112 * @param fileRevisionIndex - revision local index, non-negative. From predefined constants, only {@link HgRepository#TIP} makes sense.
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113 * @return size of the file content at the revision identified by local revision number.
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114 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em>
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115 */
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116 public int getLength(int fileRevisionIndex) throws HgRuntimeException {
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117 if (wrongRevisionIndex(fileRevisionIndex) || fileRevisionIndex == BAD_REVISION) {
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118 throw new HgInvalidRevisionException(fileRevisionIndex);
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119 }
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120 if (fileRevisionIndex == TIP) {
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121 fileRevisionIndex = getLastRevision();
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122 } else if (fileRevisionIndex == WORKING_COPY) {
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123 File f = getRepo().getFile(this);
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124 if (f.exists()) {
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125 // single revision can't be greater than 2^32, shall be safe to cast to int
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126 return Internals.ltoi(f.length());
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127 }
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128 Nodeid fileRev = getWorkingCopyRevision();
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129 if (fileRev == null) {
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130 throw new HgInvalidRevisionException(String.format("File %s is not part of working copy", getPath()), null, fileRevisionIndex);
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131 }
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132 fileRevisionIndex = getRevisionIndex(fileRev);
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133 }
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134 if (metadata == null || !metadata.checked(fileRevisionIndex)) {
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135 checkAndRecordMetadata(fileRevisionIndex);
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136 }
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137 final int dataLen = content.dataLength(fileRevisionIndex);
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138 if (metadata.known(fileRevisionIndex)) {
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139 return dataLen - metadata.dataOffset(fileRevisionIndex);
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140 }
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141 return dataLen;
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142 }
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143
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144 /**
237
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145 * Reads content of the file from working directory. If file present in the working directory, its actual content without
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146 * 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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147 * 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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148 * repository, and filters repo -> working copy get applied.
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149 *
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150 * 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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151 * e.g. from another branch), no content would be supplied.
237
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152 *
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153 * @param sink content consumer
380
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154 * @throws CancelledException if execution of the operation was cancelled
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155 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em>
237
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156 */
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157 public void workingCopy(ByteChannel sink) throws CancelledException, HgRuntimeException {
237
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158 File f = getRepo().getFile(this);
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159 if (f.exists()) {
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160 final CancelSupport cs = CancelSupport.Factory.get(sink);
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161 final ProgressSupport progress = ProgressSupport.Factory.get(sink);
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162 final long flength = f.length();
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163 final int bsize = (int) Math.min(flength, 32*1024);
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164 progress.start((int) (flength > Integer.MAX_VALUE ? flength >>> 15 /*32 kb buf size*/ : flength));
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165 ByteBuffer buf = ByteBuffer.allocate(bsize);
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166 FileChannel fc = null;
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167 try {
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168 fc = new FileInputStream(f).getChannel();
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169 while (fc.read(buf) != -1) {
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170 cs.checkCancelled();
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171 buf.flip();
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172 int consumed = sink.write(buf);
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173 progress.worked(flength > Integer.MAX_VALUE ? 1 : consumed);
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174 buf.compact();
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175 }
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176 } catch (IOException ex) {
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177 throw new HgInvalidFileException("Working copy read failed", ex, f);
237
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178 } finally {
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179 progress.done();
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180 if (fc != null) {
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181 try {
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182 fc.close();
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183 } catch (IOException ex) {
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184 getRepo().getSessionContext().getLog().dump(getClass(), Warn, ex, null);
237
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185 }
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186 }
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187 }
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188 } else {
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189 Nodeid fileRev = getWorkingCopyRevision();
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190 if (fileRev == null) {
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191 // no content for this data file in the working copy - it is not part of the actual working state.
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192 // XXX perhaps, shall report this to caller somehow, not silently pass no data?
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193 return;
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194 }
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195 final int fileRevIndex = getRevisionIndex(fileRev);
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196 contentWithFilters(fileRevIndex, sink);
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197 }
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198 }
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199
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200 /**
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201 * @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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202 */
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203 private Nodeid getWorkingCopyRevision() throws HgInvalidControlFileException {
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204 final Pair<Nodeid, Nodeid> wcParents = getRepo().getWorkingCopyParents();
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205 Nodeid p = wcParents.first().isNull() ? wcParents.second() : wcParents.first();
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206 final HgChangelog clog = getRepo().getChangelog();
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207 final int csetRevIndex;
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208 if (p.isNull()) {
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209 // no dirstate parents
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210 getRepo().getSessionContext().getLog().dump(getClass(), Info, "No dirstate parents, resort to TIP", getPath());
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211 // if it's a repository with no dirstate, use TIP then
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212 csetRevIndex = clog.getLastRevision();
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213 if (csetRevIndex == -1) {
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214 // shall not happen provided there's .i for this data file (hence at least one cset)
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215 // and perhaps exception is better here. However, null as "can't find" indication seems reasonable.
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216 return null;
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217 }
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218 } else {
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219 // common case to avoid searching complete changelog for nodeid match
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220 final Nodeid tipRev = clog.getRevision(TIP);
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221 if (tipRev.equals(p)) {
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222 csetRevIndex = clog.getLastRevision();
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223 } else {
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224 // bad luck, need to search honestly
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225 csetRevIndex = getRepo().getChangelog().getRevisionIndex(p);
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226 }
237
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227 }
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228 Nodeid fileRev = getRepo().getManifest().getFileRevision(csetRevIndex, getPath());
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229 // 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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230 // branch than the one from dirstate. Thus it's possible to get null fileRev
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231 // which would serve as an indication this data file is not part of working copy
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232 return fileRev;
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233 }
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234
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235 /**
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236 * Access content of a file revision
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237 * XXX not sure distinct method contentWithFilters() is the best way to do, perhaps, callers shall add filters themselves?
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238 *
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239 * @param fileRevisionIndex - revision local index, non-negative. From predefined constants, {@link HgRepository#TIP} and {@link HgRepository#WORKING_COPY} make sense.
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240 * @param sink content consumer
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241 *
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242 * @throws CancelledException if execution of the operation was cancelled
425
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243 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em>
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244 */
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245 public void contentWithFilters(int fileRevisionIndex, ByteChannel sink) throws CancelledException, HgRuntimeException {
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246 if (fileRevisionIndex == WORKING_COPY) {
237
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247 workingCopy(sink); // pass un-mangled sink
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248 } else {
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249 content(fileRevisionIndex, new FilterByteChannel(sink, getRepo().getFiltersFromRepoToWorkingDir(getPath())));
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250 }
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251 }
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252
367
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253 /**
396
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254 * Retrieve content of specific revision. Content is provided as is, without any filters (e.g. keywords, eol, etc.) applied.
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255 * For filtered content, use {@link #contentWithFilters(int, ByteChannel)}.
367
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256 *
368
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257 * @param fileRevisionIndex - revision local index, non-negative. From predefined constants, {@link HgRepository#TIP} and {@link HgRepository#WORKING_COPY} make sense.
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258 * @param sink content consumer
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259 *
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260 * @throws CancelledException if execution of the operation was cancelled
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261 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em>
367
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262 */
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263 public void content(int fileRevisionIndex, ByteChannel sink) throws CancelledException, HgRuntimeException {
367
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264 // for data files need to check heading of the file content for possible metadata
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265 // @see http://mercurial.selenic.com/wiki/FileFormats#data.2BAC8-
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266 if (fileRevisionIndex == TIP) {
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267 fileRevisionIndex = getLastRevision();
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268 }
367
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269 if (fileRevisionIndex == WORKING_COPY) {
237
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270 // sink is supposed to come into workingCopy without filters
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271 // thus we shall not get here (into #content) from #contentWithFilters(WC)
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272 workingCopy(sink);
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273 return;
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274 }
367
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275 if (wrongRevisionIndex(fileRevisionIndex) || fileRevisionIndex == BAD_REVISION) {
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276 throw new HgInvalidRevisionException(fileRevisionIndex);
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277 }
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278 if (sink == null) {
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279 throw new IllegalArgumentException();
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280 }
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281 if (metadata == null) {
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282 metadata = new Metadata();
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283 }
277
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284 ErrorHandlingInspector insp;
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285 final LogFacility lf = getRepo().getSessionContext().getLog();
367
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286 if (metadata.none(fileRevisionIndex)) {
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287 insp = new ContentPipe(sink, 0, lf);
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288 } else if (metadata.known(fileRevisionIndex)) {
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289 insp = new ContentPipe(sink, metadata.dataOffset(fileRevisionIndex), lf);
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290 } else {
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291 // do not know if there's metadata
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292 insp = new MetadataInspector(metadata, lf, new ContentPipe(sink, 0, lf));
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293 }
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294 insp.checkCancelled();
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295 super.content.iterate(fileRevisionIndex, fileRevisionIndex, true, insp);
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296 try {
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297 insp.checkFailed();
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298 } catch (HgInvalidControlFileException ex) {
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299 ex = ex.setFileName(getPath());
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300 throw ex.isRevisionIndexSet() ? ex : ex.setRevisionIndex(fileRevisionIndex);
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301 } catch (IOException ex) {
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302 HgInvalidControlFileException e = new HgInvalidControlFileException("Revision content access failed", ex, null);
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303 throw content.initWithIndexFile(e).setFileName(getPath()).setRevisionIndex(fileRevisionIndex);
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304 }
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305 }
425
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306
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307 /**
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308 * Walk complete change history of the file.
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309 * @param inspector callback to visit changesets
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310 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em>
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311 */
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312 public void history(HgChangelog.Inspector inspector) throws HgRuntimeException {
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313 history(0, getLastRevision(), inspector);
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314 }
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315
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316 /**
425
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317 * Walk subset of the file's change history.
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318 * @param start revision local index, inclusive; non-negative or {@link HgRepository#TIP}
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319 * @param end revision local index, inclusive; non-negative or {@link HgRepository#TIP}
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320 * @param inspector callback to visit changesets
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321 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em>
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322 */
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323 public void history(int start, int end, HgChangelog.Inspector inspector) throws HgRuntimeException {
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324 if (!exists()) {
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325 throw new IllegalStateException("Can't get history of invalid repository file node");
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326 }
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327 final int last = getLastRevision();
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328 if (end == TIP) {
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329 end = last;
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330 }
300
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331 if (start == TIP) {
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332 start = last;
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333 }
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334 HgInternals.checkRevlogRange(start, end, last);
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335
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336 final int[] commitRevisions = new int[end - start + 1];
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337 final boolean[] needsSorting = { false };
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338 RevlogStream.Inspector insp = new RevlogStream.Inspector() {
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339 int count = 0;
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340 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess data) {
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341 if (count > 0) {
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342 if (commitRevisions[count -1] > linkRevision) {
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343 needsSorting[0] = true;
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344 }
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345 }
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346 commitRevisions[count++] = linkRevision;
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347 }
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348 };
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349 content.iterate(start, end, false, insp);
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350 final HgChangelog changelog = getRepo().getChangelog();
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351 if (needsSorting[0]) {
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352 // automatic tools (svnmerge?) produce unnatural file history
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353 // (e.g. cpython/Lib/doctest.py, revision 164 points to cset 63509, 165 - to 38453)
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354 Arrays.sort(commitRevisions);
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355 }
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356 changelog.rangeInternal(inspector, commitRevisions);
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357 }
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358
354
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359 /**
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360 * For a given revision of the file (identified with revision index), find out index of the corresponding changeset.
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361 *
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362 * @return changeset revision index
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363 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em>
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364 */
437
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365 public int getChangesetRevisionIndex(int fileRevisionIndex) throws HgRuntimeException {
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366 return content.linkRevision(fileRevisionIndex);
367
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367 }
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368
354
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369 /**
367
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370 * Complements {@link #getChangesetRevisionIndex(int)} to get changeset revision that corresponds to supplied file revision
354
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371 *
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372 * @param nid revision of the file
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373 * @return changeset revision
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374 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em>
354
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375 */
425
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376 public Nodeid getChangesetRevision(Nodeid nid) throws HgRuntimeException {
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377 int changelogRevision = getChangesetRevisionIndex(getRevisionIndex(nid));
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378 return getRepo().getChangelog().getRevision(changelogRevision);
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379 }
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380
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381 /**
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382 * Tells whether this file originates from another repository file
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383 * @return <code>true</code> if this file is a copy of another from the repository
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384 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em>
354
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385 */
425
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386 public boolean isCopy() throws HgRuntimeException {
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387 if (metadata == null || !metadata.checked(0)) {
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388 checkAndRecordMetadata(0);
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389 }
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390 if (!metadata.known(0)) {
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391 return false;
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392 }
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393 return metadata.find(0, "copy") != null;
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394 }
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395
354
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396 /**
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397 * Get name of the file this one was copied from.
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398 *
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399 * @return name of the file origin
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400 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em>
354
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401 */
425
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402 public Path getCopySourceName() throws HgRuntimeException {
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403 if (isCopy()) {
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404 return Path.create(metadata.find(0, "copy"));
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405 }
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406 throw new UnsupportedOperationException(); // XXX REVISIT, think over if Exception is good (clients would check isCopy() anyway, perhaps null is sufficient?)
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407 }
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408
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409 /**
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410 *
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411 * @return revision this file was copied from
425
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412 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em>
415
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413 */
425
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414 public Nodeid getCopySourceRevision() throws HgRuntimeException {
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415 if (isCopy()) {
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416 return Nodeid.fromAscii(metadata.find(0, "copyrev")); // XXX reuse/cache Nodeid
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417 }
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418 throw new UnsupportedOperationException();
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419 }
417
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420
415
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421 /**
417
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422 * Get file flags recorded in the manifest
416
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423 * @param fileRevisionIndex - revision local index, non-negative, or {@link HgRepository#TIP}.
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424 * @see HgManifest#getFileFlags(int, Path)
425
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425 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em>
415
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426 */
425
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427 public HgManifest.Flags getFlags(int fileRevisionIndex) throws HgRuntimeException {
415
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428 int changesetRevIndex = getChangesetRevisionIndex(fileRevisionIndex);
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429 return getRepo().getManifest().getFileFlags(changesetRevIndex, getPath());
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430 }
416
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431
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432 @Override
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433 public String toString() {
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434 StringBuilder sb = new StringBuilder(getClass().getSimpleName());
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435 sb.append('(');
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436 sb.append(getPath());
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437 sb.append(')');
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438 return sb.toString();
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439 }
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440
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441 private void checkAndRecordMetadata(int localRev) throws HgInvalidControlFileException {
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442 if (metadata == null) {
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443 metadata = new Metadata();
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444 }
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445 // use MetadataInspector without delegate to process metadata only
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446 RevlogStream.Inspector insp = new MetadataInspector(metadata, getRepo().getSessionContext().getLog(), null);
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447 super.content.iterate(localRev, localRev, true, insp);
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448 }
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449
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450 private static final class MetadataEntry {
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451 private final String entry;
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452 private final int valueStart;
388
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453
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454 // key may be null
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455 /*package-local*/MetadataEntry(String key, String value) {
388
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456 if (key == null) {
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457 entry = value;
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458 valueStart = -1; // not 0 to tell between key == null and key == ""
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459 } else {
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460 entry = key + value;
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461 valueStart = key.length();
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462 }
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463 }
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464 /*package-local*/boolean matchKey(String key) {
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465 return key == null ? valueStart == -1 : key.length() == valueStart && entry.startsWith(key);
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466 }
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467 // uncomment once/if needed
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468 // public String key() {
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469 // return entry.substring(0, valueStart);
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470 // }
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471 public String value() {
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472 return valueStart == -1 ? entry : entry.substring(valueStart);
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473 }
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474 }
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475
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476 private static class Metadata {
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477 private static class Record {
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478 public final int offset;
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479 public final MetadataEntry[] entries;
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480
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481 public Record(int off, MetadataEntry[] entr) {
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482 offset = off;
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483 entries = entr;
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484 }
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485 }
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486 // XXX sparse array needed
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487 private final IntMap<Record> entries = new IntMap<Record>(5);
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488
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489 private final Record NONE = new Record(-1, null); // don't want statics
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490
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491 // true when there's metadata for given revision
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492 boolean known(int revision) {
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493 Record i = entries.get(revision);
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494 return i != null && NONE != i;
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495 }
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496
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497 // true when revision has been checked for metadata presence.
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498 public boolean checked(int revision) {
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499 return entries.containsKey(revision);
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500 }
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501
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502 // true when revision has been checked and found not having any metadata
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503 boolean none(int revision) {
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504 Record i = entries.get(revision);
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505 return i == NONE;
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506 }
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507
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508 // mark revision as having no metadata.
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509 void recordNone(int revision) {
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510 Record i = entries.get(revision);
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511 if (i == NONE) {
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512 return; // already there
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513 }
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514 if (i != null) {
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515 throw new IllegalStateException(String.format("Trying to override Metadata state for revision %d (known offset: %d)", revision, i));
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516 }
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517 entries.put(revision, NONE);
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518 }
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519
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520 // since this is internal class, callers are supposed to ensure arg correctness (i.e. ask known() before)
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521 int dataOffset(int revision) {
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522 return entries.get(revision).offset;
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523 }
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524 void add(int revision, int dataOffset, Collection<MetadataEntry> e) {
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525 assert !entries.containsKey(revision);
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526 entries.put(revision, new Record(dataOffset, e.toArray(new MetadataEntry[e.size()])));
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527 }
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528
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529 String find(int revision, String key) {
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530 for (MetadataEntry me : entries.get(revision).entries) {
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531 if (me.matchKey(key)) {
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532 return me.value();
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533 }
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534 }
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535 return null;
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536 }
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537 }
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538
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539 private static class MetadataInspector extends ErrorHandlingInspector implements RevlogStream.Inspector {
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540 private final Metadata metadata;
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541 private final RevlogStream.Inspector delegate;
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542 private final LogFacility log;
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543
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544 /**
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545 * @param _metadata never <code>null</code>
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546 * @param logFacility log facility from the session context
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547 * @param chain <code>null</code> if no further data processing other than metadata is desired
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548 */
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549 public MetadataInspector(Metadata _metadata, LogFacility logFacility, RevlogStream.Inspector chain) {
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550 metadata = _metadata;
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551 log = logFacility;
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552 delegate = chain;
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553 setCancelSupport(CancelSupport.Factory.get(chain));
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554 }
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555
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556 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess data) {
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557 try {
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558 final int daLength = data.length();
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559 if (daLength < 4 || data.readByte() != 1 || data.readByte() != 10) {
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560 metadata.recordNone(revisionNumber);
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561 data.reset();
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562 } else {
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563 ArrayList<MetadataEntry> _metadata = new ArrayList<MetadataEntry>();
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564 int offset = parseMetadata(data, daLength, _metadata);
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565 metadata.add(revisionNumber, offset, _metadata);
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566 // da is in prepared state (i.e. we consumed all bytes up to metadata end).
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567 // However, it's not safe to assume delegate won't call da.reset() for some reason,
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568 // and we need to ensure predictable result.
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569 data.reset();
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570 data = new FilterDataAccess(data, offset, daLength - offset);
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571 }
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572 if (delegate != null) {
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573 delegate.next(revisionNumber, actualLen, baseRevision, linkRevision, parent1Revision, parent2Revision, nodeid, data);
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574 }
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575 } catch (IOException ex) {
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576 recordFailure(ex);
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577 } catch (HgInvalidControlFileException ex) {
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578 // TODO RevlogStream, where this RevlogStream.Inspector goes, shall set File (as it's the only one having access to it)
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579 recordFailure(ex.isRevisionIndexSet() ? ex : ex.setRevisionIndex(revisionNumber));
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580 }
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581 }
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582
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583 private int parseMetadata(DataAccess data, final int daLength, ArrayList<MetadataEntry> _metadata) throws IOException, HgInvalidControlFileException {
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584 int lastEntryStart = 2;
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585 int lastColon = -1;
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586 // XXX in fact, need smth like ByteArrayBuilder, similar to StringBuilder,
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587 // which can't be used here because we can't convert bytes to chars as we read them
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588 // (there might be multi-byte encoding), and we need to collect all bytes before converting to string
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589 ByteArrayOutputStream bos = new ByteArrayOutputStream();
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590 String key = null, value = null;
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591 boolean byteOne = false;
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592 boolean metadataIsComplete = false;
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593 for (int i = 2; i < daLength; i++) {
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594 byte b = data.readByte();
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595 if (b == '\n') {
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596 if (byteOne) { // i.e. \n follows 1
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597 lastEntryStart = i+1;
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598 metadataIsComplete = true;
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599 // XXX is it possible to have here incomplete key/value (i.e. if last pair didn't end with \n)
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600 // if yes, need to set metadataIsComplete to true in that case as well
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601 break;
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602 }
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603 if (key == null || lastColon == -1 || i <= lastColon) {
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604 log.dump(getClass(), Error, "Missing key in file revision metadata at index %d", i);
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605 }
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606 value = new String(bos.toByteArray()).trim();
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607 bos.reset();
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608 _metadata.add(new MetadataEntry(key, value));
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609 key = value = null;
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610 lastColon = -1;
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611 lastEntryStart = i+1;
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612 continue;
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613 }
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614 // byteOne has to be consumed up to this line, if not yet, consume it
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615 if (byteOne) {
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616 // insert 1 we've read on previous step into the byte builder
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617 bos.write(1);
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618 byteOne = false;
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619 // fall-through to consume current byte
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620 }
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621 if (b == (int) ':') {
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622 assert value == null;
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623 key = new String(bos.toByteArray());
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624 bos.reset();
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625 lastColon = i;
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626 } else if (b == 1) {
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627 byteOne = true;
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628 } else {
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629 bos.write(b);
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630 }
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631 }
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632 // data.isEmpty is not reliable, renamed files of size==0 keep only metadata
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633 if (!metadataIsComplete) {
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634 // XXX perhaps, worth a testcase (empty file, renamed, read or ask ifCopy
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635 throw new HgInvalidControlFileException("Metadata is not closed properly", null, null);
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636 }
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637 return lastEntryStart;
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638 }
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639
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640 @Override
425
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641 public void checkFailed() throws HgRuntimeException, IOException, CancelledException {
322
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642 super.checkFailed();
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643 if (delegate instanceof ErrorHandlingInspector) {
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644 // TODO need to add ErrorDestination (ErrorTarget/Acceptor?) and pass it around (much like CancelSupport get passed)
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645 // so that delegate would be able report its failures directly to caller without this hack
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646 ((ErrorHandlingInspector) delegate).checkFailed();
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647 }
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648 }
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649 }
2
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650 }