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annotate src/org/tmatesoft/hg/repo/HgDataFile.java @ 490:b3c16d1aede0

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Refactoring: move HgRepository's implementation aspects to Internals (which is now its imlementation counterpart and primary repository class to be used by other parts of the library)
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Thu, 16 Aug 2012 17:08:34 +0200
parents 909306e412e2
children abfbe81154b5
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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51 /**
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52 * Regular user data file stored in the repository.
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53 *
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54 * <p> Note, most methods accept index in the file's revision history, not that of changelog. Easy way to obtain
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55 * changeset revision index from file's is to use {@link #getChangesetRevisionIndex(int)}. To obtain file's revision
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56 * index for a given changeset, {@link HgManifest#getFileRevision(int, Path)} or {@link HgChangesetFileSneaker} may
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57 * come handy.
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58 *
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59 * @author Artem Tikhomirov
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60 * @author TMate Software Ltd.
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61 */
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62 public final class HgDataFile extends Revlog {
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64 // absolute from repo root?
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65 // slashes, unix-style?
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66 // repo location agnostic, just to give info to user, not to access real storage
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67 private final Path path;
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68 private Metadata metadata; // get initialized on first access to file content.
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70 /*package-local*/HgDataFile(HgRepository hgRepo, Path filePath, RevlogStream content) {
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71 super(hgRepo, content);
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72 path = filePath;
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73 }
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75 /*package-local*/HgDataFile(HgRepository hgRepo, Path filePath) {
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76 super(hgRepo);
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77 path = filePath;
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78 }
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80 // 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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81 // it might be confused with files existed before but lately removed. TODO HgFileNode.exists makes more sense.
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82 // or HgDataFile.known()
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83 public boolean exists() {
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84 return content != null; // XXX need better impl
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85 }
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87 /**
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88 * Human-readable file name, i.e. "COPYING", not "store/data/_c_o_p_y_i_n_g.i"
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89 */
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90 public Path getPath() {
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91 return path; // hgRepo.backresolve(this) -> name? In this case, what about hashed long names?
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92 }
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93
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94 /**
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95 * Handy shorthand for {@link #getLength(int) length(getRevisionIndex(nodeid))}
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96 *
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97 * @param nodeid revision of the file
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98 *
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99 * @return size of the file content at the given revision
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100 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em>
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101 */
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102 public int getLength(Nodeid nodeid) throws HgRuntimeException {
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103 try {
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104 return getLength(getRevisionIndex(nodeid));
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105 } catch (HgInvalidControlFileException ex) {
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106 throw ex.isRevisionSet() ? ex : ex.setRevision(nodeid);
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107 } catch (HgInvalidRevisionException ex) {
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108 throw ex.isRevisionSet() ? ex : ex.setRevision(nodeid);
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109 }
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110 }
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112 /**
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113 * @param fileRevisionIndex - revision local index, non-negative. From predefined constants, only {@link HgRepository#TIP} makes sense.
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114 * @return size of the file content at the revision identified by local revision number.
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115 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em>
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116 */
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117 public int getLength(int fileRevisionIndex) throws HgRuntimeException {
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118 if (wrongRevisionIndex(fileRevisionIndex) || fileRevisionIndex == BAD_REVISION) {
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119 throw new HgInvalidRevisionException(fileRevisionIndex);
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120 }
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121 if (fileRevisionIndex == TIP) {
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122 fileRevisionIndex = getLastRevision();
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123 } else if (fileRevisionIndex == WORKING_COPY) {
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124 File f = getRepo().getFile(this);
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125 if (f.exists()) {
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126 // single revision can't be greater than 2^32, shall be safe to cast to int
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127 return Internals.ltoi(f.length());
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128 }
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129 Nodeid fileRev = getWorkingCopyRevision();
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130 if (fileRev == null) {
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131 throw new HgInvalidRevisionException(String.format("File %s is not part of working copy", getPath()), null, fileRevisionIndex);
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132 }
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133 fileRevisionIndex = getRevisionIndex(fileRev);
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134 }
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135 if (metadata == null || !metadata.checked(fileRevisionIndex)) {
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136 checkAndRecordMetadata(fileRevisionIndex);
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137 }
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138 final int dataLen = content.dataLength(fileRevisionIndex);
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139 if (metadata.known(fileRevisionIndex)) {
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140 return dataLen - metadata.dataOffset(fileRevisionIndex);
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141 }
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142 return dataLen;
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143 }
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144
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145 /**
237
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146 * Reads content of the file from working directory. If file present in the working directory, its actual content without
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147 * 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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148 * 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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149 * repository, and filters repo -> working copy get applied.
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150 *
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151 * 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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152 * e.g. from another branch), no content would be supplied.
237
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153 *
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154 * @param sink content consumer
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155 * @throws CancelledException if execution of the operation was cancelled
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156 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em>
237
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157 */
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158 public void workingCopy(ByteChannel sink) throws CancelledException, HgRuntimeException {
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159 File f = getRepo().getFile(this);
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160 if (f.exists()) {
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161 final CancelSupport cs = CancelSupport.Factory.get(sink);
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162 final ProgressSupport progress = ProgressSupport.Factory.get(sink);
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163 final long flength = f.length();
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164 final int bsize = (int) Math.min(flength, 32*1024);
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165 progress.start((int) (flength > Integer.MAX_VALUE ? flength >>> 15 /*32 kb buf size*/ : flength));
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166 ByteBuffer buf = ByteBuffer.allocate(bsize);
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167 FileChannel fc = null;
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168 try {
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169 fc = new FileInputStream(f).getChannel();
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170 while (fc.read(buf) != -1) {
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171 cs.checkCancelled();
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172 buf.flip();
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173 int consumed = sink.write(buf);
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174 progress.worked(flength > Integer.MAX_VALUE ? 1 : consumed);
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175 buf.compact();
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176 }
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177 } catch (IOException ex) {
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178 throw new HgInvalidFileException("Working copy read failed", ex, f);
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179 } finally {
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180 progress.done();
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181 if (fc != null) {
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182 try {
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183 fc.close();
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184 } catch (IOException ex) {
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185 getRepo().getSessionContext().getLog().dump(getClass(), Warn, ex, null);
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186 }
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187 }
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188 }
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189 } else {
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190 Nodeid fileRev = getWorkingCopyRevision();
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191 if (fileRev == null) {
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192 // no content for this data file in the working copy - it is not part of the actual working state.
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193 // XXX perhaps, shall report this to caller somehow, not silently pass no data?
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194 return;
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195 }
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196 final int fileRevIndex = getRevisionIndex(fileRev);
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197 contentWithFilters(fileRevIndex, sink);
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198 }
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199 }
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200
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201 /**
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202 * @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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203 */
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204 private Nodeid getWorkingCopyRevision() throws HgInvalidControlFileException {
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205 final Pair<Nodeid, Nodeid> wcParents = getRepo().getWorkingCopyParents();
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206 Nodeid p = wcParents.first().isNull() ? wcParents.second() : wcParents.first();
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207 final HgChangelog clog = getRepo().getChangelog();
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208 final int csetRevIndex;
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209 if (p.isNull()) {
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210 // no dirstate parents
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211 getRepo().getSessionContext().getLog().dump(getClass(), Info, "No dirstate parents, resort to TIP", getPath());
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212 // if it's a repository with no dirstate, use TIP then
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213 csetRevIndex = clog.getLastRevision();
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214 if (csetRevIndex == -1) {
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215 // shall not happen provided there's .i for this data file (hence at least one cset)
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216 // and perhaps exception is better here. However, null as "can't find" indication seems reasonable.
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217 return null;
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218 }
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219 } else {
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220 // common case to avoid searching complete changelog for nodeid match
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221 final Nodeid tipRev = clog.getRevision(TIP);
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222 if (tipRev.equals(p)) {
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223 csetRevIndex = clog.getLastRevision();
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224 } else {
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225 // bad luck, need to search honestly
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226 csetRevIndex = getRepo().getChangelog().getRevisionIndex(p);
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227 }
237
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228 }
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229 Nodeid fileRev = getRepo().getManifest().getFileRevision(csetRevIndex, getPath());
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230 // 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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231 // branch than the one from dirstate. Thus it's possible to get null fileRev
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232 // which would serve as an indication this data file is not part of working copy
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233 return fileRev;
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234 }
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235
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236 /**
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237 * Access content of a file revision
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238 * XXX not sure distinct method contentWithFilters() is the best way to do, perhaps, callers shall add filters themselves?
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239 *
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240 * @param fileRevisionIndex - revision local index, non-negative. From predefined constants, {@link HgRepository#TIP} and {@link HgRepository#WORKING_COPY} make sense.
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241 * @param sink content consumer
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242 *
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243 * @throws CancelledException if execution of the operation was cancelled
425
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244 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em>
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245 */
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246 public void contentWithFilters(int fileRevisionIndex, ByteChannel sink) throws CancelledException, HgRuntimeException {
396
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247 if (fileRevisionIndex == WORKING_COPY) {
237
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248 workingCopy(sink); // pass un-mangled sink
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249 } else {
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250 content(fileRevisionIndex, new FilterByteChannel(sink, getRepo().getFiltersFromRepoToWorkingDir(getPath())));
237
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251 }
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252 }
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253
367
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254 /**
396
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255 * Retrieve content of specific revision. Content is provided as is, without any filters (e.g. keywords, eol, etc.) applied.
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256 * For filtered content, use {@link #contentWithFilters(int, ByteChannel)}.
367
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257 *
368
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258 * @param fileRevisionIndex - revision local index, non-negative. From predefined constants, {@link HgRepository#TIP} and {@link HgRepository#WORKING_COPY} make sense.
396
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259 * @param sink content consumer
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260 *
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261 * @throws CancelledException if execution of the operation was cancelled
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262 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em>
367
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263 */
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264 public void content(int fileRevisionIndex, ByteChannel sink) throws CancelledException, HgRuntimeException {
367
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265 // for data files need to check heading of the file content for possible metadata
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266 // @see http://mercurial.selenic.com/wiki/FileFormats#data.2BAC8-
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267 if (fileRevisionIndex == TIP) {
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268 fileRevisionIndex = getLastRevision();
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269 }
367
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270 if (fileRevisionIndex == WORKING_COPY) {
237
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271 // sink is supposed to come into workingCopy without filters
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272 // thus we shall not get here (into #content) from #contentWithFilters(WC)
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273 workingCopy(sink);
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274 return;
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275 }
367
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276 if (wrongRevisionIndex(fileRevisionIndex) || fileRevisionIndex == BAD_REVISION) {
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277 throw new HgInvalidRevisionException(fileRevisionIndex);
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278 }
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279 if (sink == null) {
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280 throw new IllegalArgumentException();
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281 }
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282 if (metadata == null) {
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283 metadata = new Metadata();
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284 }
277
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285 ErrorHandlingInspector insp;
490
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286 final LogFacility lf = getRepo().getSessionContext().getLog();
367
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287 if (metadata.none(fileRevisionIndex)) {
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288 insp = new ContentPipe(sink, 0, lf);
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289 } else if (metadata.known(fileRevisionIndex)) {
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290 insp = new ContentPipe(sink, metadata.dataOffset(fileRevisionIndex), lf);
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291 } else {
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292 // do not know if there's metadata
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293 insp = new MetadataInspector(metadata, lf, new ContentPipe(sink, 0, lf));
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294 }
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295 insp.checkCancelled();
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296 super.content.iterate(fileRevisionIndex, fileRevisionIndex, true, insp);
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297 try {
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298 insp.checkFailed();
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299 } catch (HgInvalidControlFileException ex) {
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300 ex = ex.setFileName(getPath());
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301 throw ex.isRevisionIndexSet() ? ex : ex.setRevisionIndex(fileRevisionIndex);
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302 } catch (IOException ex) {
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303 HgInvalidControlFileException e = new HgInvalidControlFileException("Revision content access failed", ex, null);
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304 throw content.initWithIndexFile(e).setFileName(getPath()).setRevisionIndex(fileRevisionIndex);
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305 }
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306 }
425
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307
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308 /**
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309 * Walk complete change history of the file.
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310 * @param inspector callback to visit changesets
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311 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em>
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312 */
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313 public void history(HgChangelog.Inspector inspector) throws HgRuntimeException {
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314 history(0, getLastRevision(), inspector);
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315 }
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316
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317 /**
425
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318 * Walk subset of the file's change history.
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319 * @param start revision local index, inclusive; non-negative or {@link HgRepository#TIP}
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320 * @param end revision local index, inclusive; non-negative or {@link HgRepository#TIP}
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321 * @param inspector callback to visit changesets
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322 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em>
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323 */
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324 public void history(int start, int end, HgChangelog.Inspector inspector) throws HgRuntimeException {
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325 if (!exists()) {
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326 throw new IllegalStateException("Can't get history of invalid repository file node");
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327 }
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328 final int last = getLastRevision();
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329 if (end == TIP) {
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330 end = last;
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331 }
300
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332 if (start == TIP) {
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333 start = last;
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334 }
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335 HgInternals.checkRevlogRange(start, end, last);
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336
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337 final int[] commitRevisions = new int[end - start + 1];
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338 final boolean[] needsSorting = { false };
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339 RevlogStream.Inspector insp = new RevlogStream.Inspector() {
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340 int count = 0;
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341 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess data) {
242
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342 if (count > 0) {
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343 if (commitRevisions[count -1] > linkRevision) {
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344 needsSorting[0] = true;
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345 }
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346 }
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347 commitRevisions[count++] = linkRevision;
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348 }
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349 };
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350 content.iterate(start, end, false, insp);
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351 final HgChangelog changelog = getRepo().getChangelog();
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352 if (needsSorting[0]) {
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353 // automatic tools (svnmerge?) produce unnatural file history
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354 // (e.g. cpython/Lib/doctest.py, revision 164 points to cset 63509, 165 - to 38453)
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355 Arrays.sort(commitRevisions);
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356 }
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357 changelog.rangeInternal(inspector, commitRevisions);
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358 }
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359
354
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360 /**
367
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361 * For a given revision of the file (identified with revision index), find out index of the corresponding changeset.
354
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362 *
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363 * @return changeset revision index
425
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364 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em>
354
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365 */
437
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366 public int getChangesetRevisionIndex(int fileRevisionIndex) throws HgRuntimeException {
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367 return content.linkRevision(fileRevisionIndex);
367
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368 }
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369
354
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370 /**
367
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371 * Complements {@link #getChangesetRevisionIndex(int)} to get changeset revision that corresponds to supplied file revision
354
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372 *
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373 * @param nid revision of the file
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374 * @return changeset revision
425
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375 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em>
354
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376 */
425
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377 public Nodeid getChangesetRevision(Nodeid nid) throws HgRuntimeException {
367
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378 int changelogRevision = getChangesetRevisionIndex(getRevisionIndex(nid));
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379 return getRepo().getChangelog().getRevision(changelogRevision);
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380 }
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381
354
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382 /**
396
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383 * Tells whether this file originates from another repository file
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384 * @return <code>true</code> if this file is a copy of another from the repository
425
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385 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em>
354
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386 */
425
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387 public boolean isCopy() throws HgRuntimeException {
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388 if (metadata == null || !metadata.checked(0)) {
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389 checkAndRecordMetadata(0);
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390 }
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391 if (!metadata.known(0)) {
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392 return false;
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393 }
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394 return metadata.find(0, "copy") != null;
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395 }
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396
354
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397 /**
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398 * Get name of the file this one was copied from.
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399 *
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400 * @return name of the file origin
425
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401 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em>
354
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402 */
425
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403 public Path getCopySourceName() throws HgRuntimeException {
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404 if (isCopy()) {
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405 return Path.create(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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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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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 {
275
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443 // content() always initializes metadata.
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444 // TODO [post-1.0] this is expensive way to find out metadata, distinct RevlogStream.Iterator would be better.
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445 // Alternatively, may parameterize MetadataContentPipe to do prepare only.
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446 // For reference, when throwing CancelledException, hg status -A --rev 3:80 takes 70 ms
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447 // however, if we just consume buffer instead (buffer.position(buffer.limit()), same command takes ~320ms
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448 // (compared to command-line counterpart of 190ms)
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449 try {
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450 content(localRev, new ByteChannel() { // No-op channel
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451 public int write(ByteBuffer buffer) throws IOException, CancelledException {
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diff changeset
452 throw new CancelledException();
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453 }
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454 });
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diff changeset
455 } catch (CancelledException ex) {
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456 // it's ok, we did that
366
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457 } catch (HgInvalidControlFileException ex) {
396
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diff changeset
458 throw ex.isRevisionIndexSet() ? ex : ex.setRevisionIndex(localRev);
275
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459 }
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460 }
78
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461
88
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462 private static final class MetadataEntry {
78
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463 private final String entry;
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464 private final int valueStart;
388
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465
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diff changeset
466 // key may be null
78
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467 /*package-local*/MetadataEntry(String key, String value) {
388
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diff changeset
468 if (key == null) {
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diff changeset
469 entry = value;
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470 valueStart = -1; // not 0 to tell between key == null and key == ""
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471 } else {
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472 entry = key + value;
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473 valueStart = key.length();
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474 }
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475 }
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diff changeset
476 /*package-local*/boolean matchKey(String key) {
388
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477 return key == null ? valueStart == -1 : key.length() == valueStart && entry.startsWith(key);
78
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478 }
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479 // uncomment once/if needed
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480 // public String key() {
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481 // return entry.substring(0, valueStart);
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482 // }
78
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483 public String value() {
388
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diff changeset
484 return valueStart == -1 ? entry : entry.substring(valueStart);
78
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485 }
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486 }
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diff changeset
487
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488 private static class Metadata {
276
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489 private static class Record {
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490 public final int offset;
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491 public final MetadataEntry[] entries;
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492
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493 public Record(int off, MetadataEntry[] entr) {
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494 offset = off;
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495 entries = entr;
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496 }
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497 }
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498 // XXX sparse array needed
276
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499 private final IntMap<Record> entries = new IntMap<Record>(5);
134
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500
276
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501 private final Record NONE = new Record(-1, null); // don't want statics
134
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502
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503 // true when there's metadata for given revision
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504 boolean known(int revision) {
276
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505 Record i = entries.get(revision);
134
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diff changeset
506 return i != null && NONE != i;
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507 }
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diff changeset
508
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diff changeset
509 // true when revision has been checked for metadata presence.
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diff changeset
510 public boolean checked(int revision) {
276
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diff changeset
511 return entries.containsKey(revision);
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512 }
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513
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514 // true when revision has been checked and found not having any metadata
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515 boolean none(int revision) {
276
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diff changeset
516 Record i = entries.get(revision);
134
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diff changeset
517 return i == NONE;
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diff changeset
518 }
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519
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diff changeset
520 // mark revision as having no metadata.
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diff changeset
521 void recordNone(int revision) {
276
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diff changeset
522 Record i = entries.get(revision);
134
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523 if (i == NONE) {
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diff changeset
524 return; // already there
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525 }
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diff changeset
526 if (i != null) {
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diff changeset
527 throw new IllegalStateException(String.format("Trying to override Metadata state for revision %d (known offset: %d)", revision, i));
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diff changeset
528 }
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diff changeset
529 entries.put(revision, NONE);
134
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diff changeset
530 }
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diff changeset
531
78
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diff changeset
532 // since this is internal class, callers are supposed to ensure arg correctness (i.e. ask known() before)
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diff changeset
533 int dataOffset(int revision) {
276
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diff changeset
534 return entries.get(revision).offset;
78
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diff changeset
535 }
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diff changeset
536 void add(int revision, int dataOffset, Collection<MetadataEntry> e) {
276
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diff changeset
537 assert !entries.containsKey(revision);
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diff changeset
538 entries.put(revision, new Record(dataOffset, e.toArray(new MetadataEntry[e.size()])));
78
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diff changeset
539 }
276
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diff changeset
540
78
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diff changeset
541 String find(int revision, String key) {
276
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diff changeset
542 for (MetadataEntry me : entries.get(revision).entries) {
78
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diff changeset
543 if (me.matchKey(key)) {
c25c5c348d1b Skip metadata in the beginning of a file content. Parse metadata, recognize copies/renames
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diff changeset
544 return me.value();
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parents: 77
diff changeset
545 }
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parents: 77
diff changeset
546 }
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diff changeset
547 return null;
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diff changeset
548 }
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diff changeset
549 }
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diff changeset
550
277
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diff changeset
551 private static class MetadataInspector extends ErrorHandlingInspector implements RevlogStream.Inspector {
157
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diff changeset
552 private final Metadata metadata;
277
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diff changeset
553 private final RevlogStream.Inspector delegate;
388
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diff changeset
554 private final LogFacility log;
157
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diff changeset
555
396
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diff changeset
556 public MetadataInspector(Metadata _metadata, LogFacility logFacility, RevlogStream.Inspector chain) {
157
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diff changeset
557 metadata = _metadata;
388
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diff changeset
558 log = logFacility;
277
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diff changeset
559 delegate = chain;
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diff changeset
560 setCancelSupport(CancelSupport.Factory.get(chain));
157
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diff changeset
561 }
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diff changeset
562
423
9c9c442b5f2e Major refactoring of exception handling. Low-level API uses RuntimeExceptions, while checked are left for higher level
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parents: 420
diff changeset
563 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess data) {
277
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diff changeset
564 try {
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diff changeset
565 final int daLength = data.length();
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diff changeset
566 if (daLength < 4 || data.readByte() != 1 || data.readByte() != 10) {
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diff changeset
567 metadata.recordNone(revisionNumber);
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diff changeset
568 data.reset();
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569 } else {
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570 ArrayList<MetadataEntry> _metadata = new ArrayList<MetadataEntry>();
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571 int offset = parseMetadata(data, daLength, _metadata);
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572 metadata.add(revisionNumber, offset, _metadata);
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573 // da is in prepared state (i.e. we consumed all bytes up to metadata end).
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574 // However, it's not safe to assume delegate won't call da.reset() for some reason,
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575 // and we need to ensure predictable result.
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576 data.reset();
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577 data = new FilterDataAccess(data, offset, daLength - offset);
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578 }
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579 if (delegate != null) {
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580 delegate.next(revisionNumber, actualLen, baseRevision, linkRevision, parent1Revision, parent2Revision, nodeid, data);
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581 }
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582 } catch (IOException ex) {
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583 recordFailure(ex);
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584 } catch (HgInvalidControlFileException ex) {
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585 // TODO RevlogStream, where this RevlogStream.Inspector goes, shall set File (as it's the only one having access to it)
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586 recordFailure(ex.isRevisionIndexSet() ? ex : ex.setRevisionIndex(revisionNumber));
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587 }
277
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588 }
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589
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590 private int parseMetadata(DataAccess data, final int daLength, ArrayList<MetadataEntry> _metadata) throws IOException, HgInvalidControlFileException {
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591 int lastEntryStart = 2;
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592 int lastColon = -1;
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593 // XXX in fact, need smth like ByteArrayBuilder, similar to StringBuilder,
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594 // which can't be used here because we can't convert bytes to chars as we read them
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595 // (there might be multi-byte encoding), and we need to collect all bytes before converting to string
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596 ByteArrayOutputStream bos = new ByteArrayOutputStream();
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597 String key = null, value = null;
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598 boolean byteOne = false;
323
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599 boolean metadataIsComplete = false;
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600 for (int i = 2; i < daLength; i++) {
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601 byte b = data.readByte();
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602 if (b == '\n') {
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603 if (byteOne) { // i.e. \n follows 1
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604 lastEntryStart = i+1;
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605 metadataIsComplete = true;
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606 // XXX is it possible to have here incomplete key/value (i.e. if last pair didn't end with \n)
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607 // if yes, need to set metadataIsComplete to true in that case as well
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608 break;
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609 }
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610 if (key == null || lastColon == -1 || i <= lastColon) {
456
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611 log.dump(getClass(), Error, "Missing key in file revision metadata at index %d", i);
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612 }
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613 value = new String(bos.toByteArray()).trim();
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614 bos.reset();
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615 _metadata.add(new MetadataEntry(key, value));
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616 key = value = null;
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617 lastColon = -1;
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618 lastEntryStart = i+1;
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619 continue;
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620 }
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621 // byteOne has to be consumed up to this line, if not yet, consume it
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622 if (byteOne) {
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623 // insert 1 we've read on previous step into the byte builder
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624 bos.write(1);
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625 byteOne = false;
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626 // fall-through to consume current byte
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627 }
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628 if (b == (int) ':') {
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629 assert value == null;
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630 key = new String(bos.toByteArray());
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631 bos.reset();
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632 lastColon = i;
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633 } else if (b == 1) {
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634 byteOne = true;
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635 } else {
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636 bos.write(b);
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637 }
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638 }
323
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639 // data.isEmpty is not reliable, renamed files of size==0 keep only metadata
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640 if (!metadataIsComplete) {
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641 // XXX perhaps, worth a testcase (empty file, renamed, read or ask ifCopy
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642 throw new HgInvalidControlFileException("Metadata is not closed properly", null, null);
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643 }
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644 return lastEntryStart;
17
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645 }
322
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646
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647 @Override
425
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648 public void checkFailed() throws HgRuntimeException, IOException, CancelledException {
322
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649 super.checkFailed();
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650 if (delegate instanceof ErrorHandlingInspector) {
425
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651 // TODO need to add ErrorDestination (ErrorTarget/Acceptor?) and pass it around (much like CancelSupport get passed)
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652 // so that delegate would be able report its failures directly to caller without this hack
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653 ((ErrorHandlingInspector) delegate).checkFailed();
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654 }
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655 }
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656 }
2
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657 }