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annotate src/org/tmatesoft/hg/repo/HgDataFile.java @ 574:88afffd39899

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Improve memory consumption of HgManifest#getFileRevision(): avoid extra byte[] instances
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 16 Apr 2013 14:44:57 +0200
parents e4ee4bf4c7d0
children 46f29b73e51e
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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92
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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
425
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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) {
242
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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 /**
367
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360 * For a given revision of the file (identified with revision index), find out index of the corresponding changeset.
354
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361 *
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362 * @return changeset revision index
425
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363 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em>
354
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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
425
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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 /**
396
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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
425
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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
425
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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 Path.Source ps = getRepo().getSessionContext().getPathFactory();
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405 return ps.path(metadata.find(0, "copy"));
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406 }
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407 throw new UnsupportedOperationException(); // XXX REVISIT, think over if Exception is good (clients would check isCopy() anyway, perhaps null is sufficient?)
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408 }
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409
415
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410 /**
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411 *
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412 * @return revision this file was copied from
425
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413 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em>
415
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414 */
425
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415 public Nodeid getCopySourceRevision() throws HgRuntimeException {
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416 if (isCopy()) {
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417 return Nodeid.fromAscii(metadata.find(0, "copyrev")); // XXX reuse/cache Nodeid
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418 }
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419 throw new UnsupportedOperationException();
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420 }
417
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diff changeset
421
415
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422 /**
417
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423 * Get file flags recorded in the manifest
416
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424 * @param fileRevisionIndex - revision local index, non-negative, or {@link HgRepository#TIP}.
417
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diff changeset
425 * @see HgManifest#getFileFlags(int, Path)
425
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426 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em>
415
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427 */
425
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428 public HgManifest.Flags getFlags(int fileRevisionIndex) throws HgRuntimeException {
415
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429 int changesetRevIndex = getChangesetRevisionIndex(fileRevisionIndex);
417
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430 return getRepo().getManifest().getFileFlags(changesetRevIndex, getPath());
415
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431 }
416
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432
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433 @Override
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434 public String toString() {
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435 StringBuilder sb = new StringBuilder(getClass().getSimpleName());
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436 sb.append('(');
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437 sb.append(getPath());
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438 sb.append(')');
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439 return sb.toString();
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440 }
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441
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442 private void checkAndRecordMetadata(int localRev) throws HgInvalidControlFileException {
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443 if (metadata == null) {
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444 metadata = new Metadata();
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445 }
495
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446 // use MetadataInspector without delegate to process metadata only
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diff changeset
447 RevlogStream.Inspector insp = new MetadataInspector(metadata, getRepo().getSessionContext().getLog(), null);
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448 super.content.iterate(localRev, localRev, true, insp);
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449 }
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450
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451 private static final class MetadataEntry {
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452 private final String entry;
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453 private final int valueStart;
388
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454
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455 // key may be null
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456 /*package-local*/MetadataEntry(String key, String value) {
388
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457 if (key == null) {
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458 entry = value;
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459 valueStart = -1; // not 0 to tell between key == null and key == ""
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460 } else {
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461 entry = key + value;
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462 valueStart = key.length();
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463 }
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464 }
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465 /*package-local*/boolean matchKey(String key) {
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466 return key == null ? valueStart == -1 : key.length() == valueStart && entry.startsWith(key);
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467 }
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468 // uncomment once/if needed
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469 // public String key() {
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470 // return entry.substring(0, valueStart);
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471 // }
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472 public String value() {
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473 return valueStart == -1 ? entry : entry.substring(valueStart);
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474 }
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475 }
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476
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477 private static class Metadata {
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478 private static class Record {
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479 public final int offset;
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480 public final MetadataEntry[] entries;
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481
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482 public Record(int off, MetadataEntry[] entr) {
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483 offset = off;
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484 entries = entr;
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485 }
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486 }
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487 // XXX sparse array needed
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488 private final IntMap<Record> entries = new IntMap<Record>(5);
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489
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490 private final Record NONE = new Record(-1, null); // don't want statics
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491
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492 // true when there's metadata for given revision
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493 boolean known(int revision) {
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494 Record i = entries.get(revision);
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495 return i != null && NONE != i;
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496 }
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497
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498 // true when revision has been checked for metadata presence.
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499 public boolean checked(int revision) {
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500 return entries.containsKey(revision);
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501 }
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502
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503 // true when revision has been checked and found not having any metadata
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504 boolean none(int revision) {
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505 Record i = entries.get(revision);
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506 return i == NONE;
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507 }
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508
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509 // mark revision as having no metadata.
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510 void recordNone(int revision) {
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511 Record i = entries.get(revision);
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512 if (i == NONE) {
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513 return; // already there
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514 }
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515 if (i != null) {
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516 throw new IllegalStateException(String.format("Trying to override Metadata state for revision %d (known offset: %d)", revision, i));
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517 }
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518 entries.put(revision, NONE);
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519 }
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520
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521 // since this is internal class, callers are supposed to ensure arg correctness (i.e. ask known() before)
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522 int dataOffset(int revision) {
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523 return entries.get(revision).offset;
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524 }
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525 void add(int revision, int dataOffset, Collection<MetadataEntry> e) {
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526 assert !entries.containsKey(revision);
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527 entries.put(revision, new Record(dataOffset, e.toArray(new MetadataEntry[e.size()])));
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528 }
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529
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530 String find(int revision, String key) {
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531 for (MetadataEntry me : entries.get(revision).entries) {
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532 if (me.matchKey(key)) {
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533 return me.value();
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534 }
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535 }
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536 return null;
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537 }
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538 }
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539
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540 private static class MetadataInspector extends ErrorHandlingInspector implements RevlogStream.Inspector {
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541 private final Metadata metadata;
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542 private final RevlogStream.Inspector delegate;
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543 private final LogFacility log;
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544
495
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545 /**
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546 * @param _metadata never <code>null</code>
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547 * @param logFacility log facility from the session context
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548 * @param chain <code>null</code> if no further data processing other than metadata is desired
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549 */
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550 public MetadataInspector(Metadata _metadata, LogFacility logFacility, RevlogStream.Inspector chain) {
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551 metadata = _metadata;
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552 log = logFacility;
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553 delegate = chain;
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554 setCancelSupport(CancelSupport.Factory.get(chain));
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555 }
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556
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557 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess data) {
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558 try {
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559 final int daLength = data.length();
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560 if (daLength < 4 || data.readByte() != 1 || data.readByte() != 10) {
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561 metadata.recordNone(revisionNumber);
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562 data.reset();
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563 } else {
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564 ArrayList<MetadataEntry> _metadata = new ArrayList<MetadataEntry>();
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565 int offset = parseMetadata(data, daLength, _metadata);
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566 metadata.add(revisionNumber, offset, _metadata);
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567 // da is in prepared state (i.e. we consumed all bytes up to metadata end).
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568 // However, it's not safe to assume delegate won't call da.reset() for some reason,
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569 // and we need to ensure predictable result.
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570 data.reset();
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571 data = new FilterDataAccess(data, offset, daLength - offset);
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572 }
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573 if (delegate != null) {
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574 delegate.next(revisionNumber, actualLen, baseRevision, linkRevision, parent1Revision, parent2Revision, nodeid, data);
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575 }
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576 } catch (IOException ex) {
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577 recordFailure(ex);
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578 } catch (HgInvalidControlFileException ex) {
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579 // TODO RevlogStream, where this RevlogStream.Inspector goes, shall set File (as it's the only one having access to it)
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580 recordFailure(ex.isRevisionIndexSet() ? ex : ex.setRevisionIndex(revisionNumber));
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581 }
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582 }
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583
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584 private int parseMetadata(DataAccess data, final int daLength, ArrayList<MetadataEntry> _metadata) throws IOException, HgInvalidControlFileException {
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585 int lastEntryStart = 2;
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586 int lastColon = -1;
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587 // XXX in fact, need smth like ByteArrayBuilder, similar to StringBuilder,
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588 // which can't be used here because we can't convert bytes to chars as we read them
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589 // (there might be multi-byte encoding), and we need to collect all bytes before converting to string
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590 ByteArrayOutputStream bos = new ByteArrayOutputStream();
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591 String key = null, value = null;
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592 boolean byteOne = false;
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593 boolean metadataIsComplete = false;
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594 for (int i = 2; i < daLength; i++) {
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595 byte b = data.readByte();
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596 if (b == '\n') {
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597 if (byteOne) { // i.e. \n follows 1
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598 lastEntryStart = i+1;
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599 metadataIsComplete = true;
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600 // XXX is it possible to have here incomplete key/value (i.e. if last pair didn't end with \n)
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601 // if yes, need to set metadataIsComplete to true in that case as well
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602 break;
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603 }
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604 if (key == null || lastColon == -1 || i <= lastColon) {
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605 log.dump(getClass(), Error, "Missing key in file revision metadata at index %d", i);
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606 }
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607 value = new String(bos.toByteArray()).trim();
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608 bos.reset();
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609 _metadata.add(new MetadataEntry(key, value));
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610 key = value = null;
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611 lastColon = -1;
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612 lastEntryStart = i+1;
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613 continue;
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614 }
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615 // byteOne has to be consumed up to this line, if not yet, consume it
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616 if (byteOne) {
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617 // insert 1 we've read on previous step into the byte builder
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618 bos.write(1);
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619 byteOne = false;
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620 // fall-through to consume current byte
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621 }
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622 if (b == (int) ':') {
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623 assert value == null;
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624 key = new String(bos.toByteArray());
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625 bos.reset();
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626 lastColon = i;
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627 } else if (b == 1) {
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628 byteOne = true;
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629 } else {
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630 bos.write(b);
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631 }
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632 }
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633 // data.isEmpty is not reliable, renamed files of size==0 keep only metadata
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634 if (!metadataIsComplete) {
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635 // XXX perhaps, worth a testcase (empty file, renamed, read or ask ifCopy
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636 throw new HgInvalidControlFileException("Metadata is not closed properly", null, null);
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637 }
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638 return lastEntryStart;
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639 }
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640
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641 @Override
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642 public void checkFailed() throws HgRuntimeException, IOException, CancelledException {
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643 super.checkFailed();
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644 if (delegate instanceof ErrorHandlingInspector) {
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645 // TODO need to add ErrorDestination (ErrorTarget/Acceptor?) and pass it around (much like CancelSupport get passed)
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646 // so that delegate would be able report its failures directly to caller without this hack
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647 ((ErrorHandlingInspector) delegate).checkFailed();
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648 }
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649 }
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650 }
2
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651 }