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annotate src/org/tmatesoft/hg/repo/HgDataFile.java @ 382:82336b7c54f4

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Per-repository UpdateConfigCommand completed. Access to system properties through SessionContext to ease alternation
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Fri, 10 Feb 2012 13:56:24 +0100
parents 9517df1ef7ec
children 994b5813a925
rev   line source
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1 /*
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2 * Copyright (c) 2010-2011 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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22 import java.io.ByteArrayOutputStream;
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23 import java.io.File;
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24 import java.io.FileInputStream;
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25 import java.io.IOException;
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26 import java.nio.ByteBuffer;
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27 import java.nio.channels.FileChannel;
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28 import java.util.ArrayList;
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29 import java.util.Arrays;
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30 import java.util.Collection;
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31 import java.util.Collections;
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32 import java.util.List;
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33
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34 import org.tmatesoft.hg.core.HgDataStreamException;
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35 import org.tmatesoft.hg.core.HgException;
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36 import org.tmatesoft.hg.core.HgInvalidControlFileException;
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37 import org.tmatesoft.hg.core.HgInvalidRevisionException;
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38 import org.tmatesoft.hg.core.HgLogCommand;
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39 import org.tmatesoft.hg.core.Nodeid;
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40 import org.tmatesoft.hg.internal.DataAccess;
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41 import org.tmatesoft.hg.internal.FilterByteChannel;
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42 import org.tmatesoft.hg.internal.FilterDataAccess;
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43 import org.tmatesoft.hg.internal.IntMap;
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44 import org.tmatesoft.hg.internal.RevlogStream;
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45 import org.tmatesoft.hg.util.ByteChannel;
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46 import org.tmatesoft.hg.util.CancelSupport;
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47 import org.tmatesoft.hg.util.CancelledException;
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48 import org.tmatesoft.hg.util.Pair;
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49 import org.tmatesoft.hg.util.Path;
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50 import org.tmatesoft.hg.util.ProgressSupport;
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54 /**
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55 * ? name:HgFileNode?
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56 *
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57 * @author Artem Tikhomirov
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58 * @author TMate Software Ltd.
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59 */
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60 public class HgDataFile extends Revlog {
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61
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62 // absolute from repo root?
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63 // slashes, unix-style?
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64 // repo location agnostic, just to give info to user, not to access real storage
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65 private final Path path;
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66 private Metadata metadata; // get initialized on first access to file content.
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68 /*package-local*/HgDataFile(HgRepository hgRepo, Path filePath, RevlogStream content) {
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69 super(hgRepo, content);
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70 path = filePath;
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71 }
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73 /*package-local*/HgDataFile(HgRepository hgRepo, Path filePath) {
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74 super(hgRepo);
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75 path = filePath;
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76 }
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78 // 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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79 // it might be confused with files existed before but lately removed.
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80 public boolean exists() {
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81 return content != null; // XXX need better impl
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82 }
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84 // human-readable (i.e. "COPYING", not "store/data/_c_o_p_y_i_n_g.i")
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85 public Path getPath() {
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86 return path; // hgRepo.backresolve(this) -> name? In this case, what about hashed long names?
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87 }
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88
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89 /**
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90 * Handy shorthand for {@link #length(int) length(getRevisionIndex(nodeid))}
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91 *
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92 * @param nodeid revision of the file
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93 *
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94 * @return size of the file content at the given revision
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95 * @throws HgInvalidRevisionException if supplied nodeid doesn't identify any revision from this revlog
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96 * @throws HgDataStreamException if attempt to access file metadata failed
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97 * @throws HgInvalidControlFileException if access to revlog index/data entry failed
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98 */
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99 public int length(Nodeid nodeid) throws HgDataStreamException, HgInvalidControlFileException, HgInvalidRevisionException {
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100 return length(getRevisionIndex(nodeid));
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101 }
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102
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103 /**
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104 * @param fileRevisionIndex - revision local index, non-negative. From predefined constants, only {@link HgRepository#TIP} makes sense.
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105 * @return size of the file content at the revision identified by local revision number.
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106 * @throws HgInvalidRevisionException if supplied argument doesn't represent revision index in this revlog
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107 * @throws HgDataStreamException if attempt to access file metadata failed
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108 * @throws HgInvalidControlFileException if access to revlog index/data entry failed
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109 */
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110 public int length(int fileRevisionIndex) throws HgDataStreamException, HgInvalidControlFileException, HgInvalidRevisionException {
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111 // TODO support WORKING_COPY constant
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112 if (metadata == null || !metadata.checked(fileRevisionIndex)) {
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113 checkAndRecordMetadata(fileRevisionIndex);
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114 }
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115 final int dataLen = content.dataLength(fileRevisionIndex);
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116 if (metadata.known(fileRevisionIndex)) {
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117 return dataLen - metadata.dataOffset(fileRevisionIndex);
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118 }
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119 return dataLen;
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120 }
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121
237
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122 /**
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123 * Reads content of the file from working directory. If file present in the working directory, its actual content without
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124 * 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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125 * as if it would be refreshed in the working copy, i.e. its corresponding revision
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126 * (XXX according to dirstate? file tip?) is read from the repository, and filters repo -> working copy get applied.
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127 *
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128 * @param sink where to pipe content to
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129 * @throws HgDataStreamException to indicate troubles reading repository file
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130 * @throws CancelledException if execution of the operation was cancelled
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131 */
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132 public void workingCopy(ByteChannel sink) throws HgDataStreamException, HgInvalidControlFileException, CancelledException {
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133 File f = getRepo().getFile(this);
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134 if (f.exists()) {
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135 final CancelSupport cs = CancelSupport.Factory.get(sink);
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136 final ProgressSupport progress = ProgressSupport.Factory.get(sink);
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137 final long flength = f.length();
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138 final int bsize = (int) Math.min(flength, 32*1024);
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139 progress.start((int) (flength > Integer.MAX_VALUE ? flength >>> 15 /*32 kb buf size*/ : flength));
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140 ByteBuffer buf = ByteBuffer.allocate(bsize);
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141 FileChannel fc = null;
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142 try {
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143 fc = new FileInputStream(f).getChannel();
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144 while (fc.read(buf) != -1) {
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145 cs.checkCancelled();
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146 buf.flip();
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147 int consumed = sink.write(buf);
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148 progress.worked(flength > Integer.MAX_VALUE ? 1 : consumed);
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149 buf.compact();
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150 }
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151 } catch (IOException ex) {
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152 throw new HgDataStreamException(getPath(), ex);
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153 } finally {
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154 progress.done();
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155 if (fc != null) {
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156 try {
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157 fc.close();
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158 } catch (IOException ex) {
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159 getRepo().getContext().getLog().info(getClass(), ex, null);
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160 }
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161 }
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162 }
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163 } else {
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164 // FIXME not TIP, but revision according to dirstate!!!
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165 // add tests for this case
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166 contentWithFilters(TIP, sink);
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167 }
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168 }
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169
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170 // public void content(int revision, ByteChannel sink, boolean applyFilters) throws HgDataStreamException, IOException, CancelledException {
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171 // byte[] content = content(revision);
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172 // final CancelSupport cancelSupport = CancelSupport.Factory.get(sink);
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173 // final ProgressSupport progressSupport = ProgressSupport.Factory.get(sink);
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174 // ByteBuffer buf = ByteBuffer.allocate(512);
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175 // int left = content.length;
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176 // progressSupport.start(left);
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177 // int offset = 0;
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178 // cancelSupport.checkCancelled();
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179 // ByteChannel _sink = applyFilters ? new FilterByteChannel(sink, getRepo().getFiltersFromRepoToWorkingDir(getPath())) : sink;
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180 // do {
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181 // buf.put(content, offset, Math.min(left, buf.remaining()));
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182 // buf.flip();
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183 // cancelSupport.checkCancelled();
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184 // // XXX I may not rely on returned number of bytes but track change in buf position instead.
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185 // int consumed = _sink.write(buf);
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186 // buf.compact();
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187 // offset += consumed;
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188 // left -= consumed;
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189 // progressSupport.worked(consumed);
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190 // } while (left > 0);
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191 // progressSupport.done(); // XXX shall specify whether #done() is invoked always or only if completed successfully.
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192 // }
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193
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194 /*XXX not sure distinct method contentWithFilters() is the best way to do, perhaps, callers shall add filters themselves?*/
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195 public void contentWithFilters(int revision, ByteChannel sink) throws HgDataStreamException, HgInvalidControlFileException, CancelledException, HgInvalidRevisionException {
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196 if (revision == WORKING_COPY) {
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197 workingCopy(sink); // pass un-mangled sink
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198 } else {
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199 content(revision, new FilterByteChannel(sink, getRepo().getFiltersFromRepoToWorkingDir(getPath())));
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200 }
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201 }
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202
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203 /**
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204 *
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205 * @param fileRevisionIndex - revision local index, non-negative. From predefined constants, {@link HgRepository#TIP} and {@link HgRepository#WORKING_COPY} make sense.
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206 * @param sink
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207 * @throws HgDataStreamException FIXME
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208 * @throws HgInvalidControlFileException if access to revlog index/data entry failed
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209 * @throws CancelledException if execution of the operation was cancelled
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210 * @throws HgInvalidRevisionException if supplied argument doesn't represent revision index in this revlog
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211 */
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212 public void content(int fileRevisionIndex, ByteChannel sink) throws HgDataStreamException, HgInvalidControlFileException, CancelledException, HgInvalidRevisionException {
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213 // for data files need to check heading of the file content for possible metadata
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214 // @see http://mercurial.selenic.com/wiki/FileFormats#data.2BAC8-
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215 if (fileRevisionIndex == TIP) {
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216 fileRevisionIndex = getLastRevision();
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217 }
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218 if (fileRevisionIndex == WORKING_COPY) {
237
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219 // sink is supposed to come into workingCopy without filters
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220 // thus we shall not get here (into #content) from #contentWithFilters(WC)
157
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221 workingCopy(sink);
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222 return;
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223 }
367
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224 if (wrongRevisionIndex(fileRevisionIndex) || fileRevisionIndex == BAD_REVISION) {
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225 throw new HgInvalidRevisionException(fileRevisionIndex);
148
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226 }
157
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227 if (sink == null) {
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228 throw new IllegalArgumentException();
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229 }
134
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230 if (metadata == null) {
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231 metadata = new Metadata();
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232 }
277
74e7493a042a Favor delegation over generalization
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233 ErrorHandlingInspector insp;
367
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234 if (metadata.none(fileRevisionIndex)) {
355
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235 insp = new ContentPipe(sink, 0, getRepo().getContext().getLog());
367
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236 } else if (metadata.known(fileRevisionIndex)) {
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237 insp = new ContentPipe(sink, metadata.dataOffset(fileRevisionIndex), getRepo().getContext().getLog());
157
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238 } else {
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239 // do not know if there's metadata
355
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240 insp = new MetadataInspector(metadata, getPath(), new ContentPipe(sink, 0, getRepo().getContext().getLog()));
78
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241 }
157
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242 insp.checkCancelled();
367
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243 super.content.iterate(fileRevisionIndex, fileRevisionIndex, true, insp);
157
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244 try {
237
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245 insp.checkFailed(); // XXX is there real need to throw IOException from ContentPipe?
157
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246 } catch (HgDataStreamException ex) {
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247 throw ex;
237
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248 } catch (IOException ex) {
367
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249 throw new HgDataStreamException(getPath(), ex).setRevisionIndex(fileRevisionIndex);
157
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250 } catch (HgException ex) {
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251 // shall not happen, unless we changed ContentPipe or its subclass
215
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252 throw new HgDataStreamException(getPath(), ex.getClass().getName(), ex);
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253 }
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254 }
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255
317
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256 private static class HistoryNode {
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257 int changeset;
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258 Nodeid cset;
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259 HistoryNode parent1, parent2;
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260 List<HistoryNode> children;
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261
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262 HistoryNode(int cs, HistoryNode p1, HistoryNode p2) {
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263 changeset = cs;
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264 parent1 = p1;
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265 parent2 = p2;
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266 if (p1 != null) {
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267 p1.addChild(this);
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268 }
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269 if (p2 != null) {
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270 p2.addChild(this);
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271 }
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272 }
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273
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274 Nodeid changesetRevision() {
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275 assert cset != null : "we initialize all csets prior to use";
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276 return cset;
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277 }
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278
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279 void addChild(HistoryNode child) {
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280 if (children == null) {
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281 children = new ArrayList<HistoryNode>(2);
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282 }
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283 children.add(child);
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284 }
305
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285 }
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286
328
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287 /**
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288 * @deprecated use {@link HgLogCommand#execute(org.tmatesoft.hg.core.HgChangesetTreeHandler)} instead
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289 */
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290 @Deprecated
366
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291 public void history(HgChangelog.TreeInspector inspector) throws HgInvalidControlFileException{
317
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292 final CancelSupport cancelSupport = CancelSupport.Factory.get(inspector);
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293 try {
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294 final boolean[] needsSorting = { false };
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295 final HistoryNode[] completeHistory = new HistoryNode[getRevisionCount()];
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296 final int[] commitRevisions = new int[completeHistory.length];
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297 RevlogStream.Inspector insp = new RevlogStream.Inspector() {
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298 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess data) {
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299 if (revisionNumber > 0) {
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300 if (commitRevisions[revisionNumber-1] > linkRevision) {
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301 needsSorting[0] = true;
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302 }
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303 }
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304 commitRevisions[revisionNumber] = linkRevision;
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305 HistoryNode p1 = null, p2 = null;
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306 if (parent1Revision != -1) {
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307 p1 = completeHistory[parent1Revision];
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308 }
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309 if (parent2Revision != -1) {
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310 p2 = completeHistory[parent2Revision];
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311 }
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312 completeHistory[revisionNumber] = new HistoryNode(linkRevision, p1, p2);
305
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313 }
317
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314 };
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315 content.iterate(0, getLastRevision(), false, insp);
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diff changeset
316 cancelSupport.checkCancelled();
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317 if (needsSorting[0]) {
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318 Arrays.sort(commitRevisions);
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319 }
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320 // read changeset revisions at once (to avoid numerous changelog.getRevision reads)
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321 // but just nodeids, not RawChangeset (changelog.iterate(data=false)
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322 ArrayList<Nodeid> changesetRevisions = new ArrayList<Nodeid>(commitRevisions.length);
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323 getRepo().getChangelog().getRevisionsInternal(changesetRevisions, commitRevisions);
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324 cancelSupport.checkCancelled();
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325 // assign them to corresponding HistoryNodes
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326 for (int i = 0; i < completeHistory.length; i++ ) {
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diff changeset
327 final HistoryNode n = completeHistory[i];
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328 if (needsSorting[0]) {
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329 int x = Arrays.binarySearch(commitRevisions, n.changeset);
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330 assert x >= 0;
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331 n.cset = changesetRevisions.get(x);
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332 } else {
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333 // commit revisions were not sorted, may use original index directly
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334 n.cset = changesetRevisions.get(i);
305
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335 }
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336 }
317
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337 cancelSupport.checkCancelled();
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338 // XXX shall sort completeHistory according to changeset numbers?
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339 for (int i = 0; i < completeHistory.length; i++ ) {
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340 final HistoryNode n = completeHistory[i];
305
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341 HistoryNode p;
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342 Nodeid p1, p2;
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343 if ((p = n.parent1) != null) {
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344 p1 = p.changesetRevision();
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345 } else {
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346 p1 = Nodeid.NULL;
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347 }
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348 if ((p= n.parent2) != null) {
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349 p2 = p.changesetRevision();
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350 } else {
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351 p2 = Nodeid.NULL;
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352 }
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353 final Pair<Nodeid, Nodeid> parentChangesets = new Pair<Nodeid, Nodeid>(p1, p2);
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354 final List<Nodeid> childChangesets;
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355 if (n.children == null) {
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356 childChangesets = Collections.emptyList();
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357 } else {
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358 Nodeid[] revisions = new Nodeid[n.children.size()];
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359 int j = 0;
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360 for (HistoryNode hn : n.children) {
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361 revisions[j++] = hn.changesetRevision();
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362 }
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363 childChangesets = Arrays.asList(revisions);
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364 }
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365 inspector.next(n.changesetRevision(), parentChangesets, childChangesets);
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366 cancelSupport.checkCancelled();
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367 }
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368 } catch (CancelledException ex) {
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369 return;
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370 }
305
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371 }
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372
366
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373 public void history(HgChangelog.Inspector inspector) throws HgInvalidControlFileException {
135
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374 history(0, getLastRevision(), inspector);
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375 }
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376
366
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377 public void history(int start, int end, HgChangelog.Inspector inspector) throws HgInvalidRevisionException, HgInvalidControlFileException {
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378 if (!exists()) {
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379 throw new IllegalStateException("Can't get history of invalid repository file node");
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380 }
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381 final int last = getLastRevision();
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382 if (end == TIP) {
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383 end = last;
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384 }
300
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385 if (start == TIP) {
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386 start = last;
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387 }
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388 HgInternals.checkRevlogRange(start, end, last);
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389
48
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390 final int[] commitRevisions = new int[end - start + 1];
242
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391 final boolean[] needsSorting = { false };
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392 RevlogStream.Inspector insp = new RevlogStream.Inspector() {
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393 int count = 0;
51
9429c7bd1920 Try DataAccess to reach revision data instead of plain byte arrays
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394 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess data) {
242
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395 if (count > 0) {
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396 if (commitRevisions[count -1] > linkRevision) {
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397 needsSorting[0] = true;
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398 }
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399 }
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400 commitRevisions[count++] = linkRevision;
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401 }
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402 };
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403 content.iterate(start, end, false, insp);
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404 final HgChangelog changelog = getRepo().getChangelog();
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405 if (needsSorting[0]) {
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406 // automatic tools (svnmerge?) produce unnatural file history
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407 // (e.g. cpython/Lib/doctest.py, revision 164 points to cset 63509, 165 - to 38453)
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diff changeset
408 Arrays.sort(commitRevisions);
233
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409 }
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diff changeset
410 changelog.rangeInternal(inspector, commitRevisions);
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411 }
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diff changeset
412
354
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diff changeset
413 /**
367
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414 * For a given revision of the file (identified with revision index), find out index of the corresponding changeset.
354
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415 *
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416 * @return changeset revision index
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417 * @throws HgInvalidRevisionException if supplied argument doesn't represent revision index in this revlog
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418 * @throws HgInvalidControlFileException if access to revlog index/data entry failed
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419 */
367
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diff changeset
420 public int getChangesetRevisionIndex(int revision) throws HgInvalidControlFileException, HgInvalidRevisionException {
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diff changeset
421 return content.linkRevision(revision);
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422 }
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diff changeset
423 /**
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diff changeset
424 * @deprecated use {@link #getChangesetRevisionIndex(int)} instead
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diff changeset
425 */
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diff changeset
426 @Deprecated
354
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diff changeset
427 public int getChangesetLocalRevision(int revision) throws HgInvalidControlFileException, HgInvalidRevisionException {
367
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diff changeset
428 return getChangesetRevisionIndex(revision);
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diff changeset
429 }
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430
354
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431 /**
367
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432 * Complements {@link #getChangesetRevisionIndex(int)} to get changeset revision that corresponds to supplied file revision
354
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433 *
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434 * @param nid revision of the file
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435 * @return changeset revision
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436 * @throws HgInvalidRevisionException if supplied argument doesn't represent revision index in this revlog
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437 * @throws HgInvalidControlFileException if access to revlog index/data entry failed
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diff changeset
438 */
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diff changeset
439 public Nodeid getChangesetRevision(Nodeid nid) throws HgInvalidControlFileException, HgInvalidRevisionException {
367
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diff changeset
440 int changelogRevision = getChangesetRevisionIndex(getRevisionIndex(nid));
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diff changeset
441 return getRepo().getChangelog().getRevision(changelogRevision);
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442 }
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diff changeset
443
354
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diff changeset
444 /**
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diff changeset
445 *
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diff changeset
446 * @return
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diff changeset
447 * @throws HgDataStreamException if attempt to access file metadata failed
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diff changeset
448 */
157
d5268ca7715b Merged branch wrap-data-access into default for resource-friendly data access. Updated API to promote that friendliness to clients (channels, not byte[]). More exceptions
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diff changeset
449 public boolean isCopy() throws HgDataStreamException {
134
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diff changeset
450 if (metadata == null || !metadata.checked(0)) {
275
6d1804fe0ed7 Issue 10: Report file content length with respect of metadata. Respect dirstate parents for WC's status. Exceptions to keep useful attributes of the location
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diff changeset
451 checkAndRecordMetadata(0);
78
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452 }
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diff changeset
453 if (!metadata.known(0)) {
78
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diff changeset
454 return false;
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diff changeset
455 }
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diff changeset
456 return metadata.find(0, "copy") != null;
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diff changeset
457 }
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diff changeset
458
354
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diff changeset
459 /**
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460 * Get name of the file this one was copied from.
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461 *
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462 * @return name of the file origin
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463 * @throws HgDataStreamException if attempt to access file metadata failed
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464 * @throws UnsupportedOperationException if this file doesn't represent a copy ({@link #isCopy()} was false)
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465 */
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466 public Path getCopySourceName() throws HgDataStreamException {
78
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467 if (isCopy()) {
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468 return Path.create(metadata.find(0, "copy"));
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469 }
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470 throw new UnsupportedOperationException(); // XXX REVISIT, think over if Exception is good (clients would check isCopy() anyway, perhaps null is sufficient?)
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471 }
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472
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473 public Nodeid getCopySourceRevision() throws HgDataStreamException {
78
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474 if (isCopy()) {
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475 return Nodeid.fromAscii(metadata.find(0, "copyrev")); // XXX reuse/cache Nodeid
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476 }
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477 throw new UnsupportedOperationException();
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478 }
88
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479
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480 @Override
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481 public String toString() {
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482 StringBuilder sb = new StringBuilder(getClass().getSimpleName());
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483 sb.append('(');
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484 sb.append(getPath());
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485 sb.append(')');
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486 return sb.toString();
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487 }
275
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488
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489 private void checkAndRecordMetadata(int localRev) throws HgDataStreamException {
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490 // content() always initializes metadata.
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491 // FIXME this is expensive way to find out metadata, distinct RevlogStream.Iterator would be better.
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492 // Alternatively, may parameterize MetadataContentPipe to do prepare only.
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493 // For reference, when throwing CancelledException, hg status -A --rev 3:80 takes 70 ms
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494 // however, if we just consume buffer instead (buffer.position(buffer.limit()), same command takes ~320ms
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495 // (compared to command-line counterpart of 190ms)
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496 try {
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497 content(localRev, new ByteChannel() { // No-op channel
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498 public int write(ByteBuffer buffer) throws IOException, CancelledException {
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499 throw new CancelledException();
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500 }
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501 });
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502 } catch (CancelledException ex) {
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503 // it's ok, we did that
366
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504 } catch (HgInvalidControlFileException ex) {
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505 throw new HgDataStreamException(getPath(), ex);
275
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506 }
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507 }
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508
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509 private static final class MetadataEntry {
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510 private final String entry;
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511 private final int valueStart;
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512 /*package-local*/MetadataEntry(String key, String value) {
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513 entry = key + value;
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514 valueStart = key.length();
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515 }
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516 /*package-local*/boolean matchKey(String key) {
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517 return key.length() == valueStart && entry.startsWith(key);
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518 }
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519 // uncomment once/if needed
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520 // public String key() {
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521 // return entry.substring(0, valueStart);
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522 // }
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523 public String value() {
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524 return entry.substring(valueStart);
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525 }
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526 }
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527
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528 private static class Metadata {
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529 private static class Record {
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530 public final int offset;
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531 public final MetadataEntry[] entries;
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532
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533 public Record(int off, MetadataEntry[] entr) {
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534 offset = off;
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535 entries = entr;
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536 }
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537 }
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538 // XXX sparse array needed
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539 private final IntMap<Record> entries = new IntMap<Record>(5);
134
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540
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541 private final Record NONE = new Record(-1, null); // don't want statics
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542
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543 // true when there's metadata for given revision
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544 boolean known(int revision) {
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545 Record i = entries.get(revision);
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546 return i != null && NONE != i;
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547 }
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548
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549 // true when revision has been checked for metadata presence.
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550 public boolean checked(int revision) {
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551 return entries.containsKey(revision);
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552 }
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553
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554 // true when revision has been checked and found not having any metadata
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555 boolean none(int revision) {
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556 Record i = entries.get(revision);
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557 return i == NONE;
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558 }
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559
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560 // mark revision as having no metadata.
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561 void recordNone(int revision) {
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562 Record i = entries.get(revision);
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563 if (i == NONE) {
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564 return; // already there
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565 }
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566 if (i != null) {
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567 throw new IllegalStateException(String.format("Trying to override Metadata state for revision %d (known offset: %d)", revision, i));
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568 }
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569 entries.put(revision, NONE);
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570 }
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571
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572 // since this is internal class, callers are supposed to ensure arg correctness (i.e. ask known() before)
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573 int dataOffset(int revision) {
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574 return entries.get(revision).offset;
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575 }
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576 void add(int revision, int dataOffset, Collection<MetadataEntry> e) {
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577 assert !entries.containsKey(revision);
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578 entries.put(revision, new Record(dataOffset, e.toArray(new MetadataEntry[e.size()])));
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579 }
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580
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581 String find(int revision, String key) {
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582 for (MetadataEntry me : entries.get(revision).entries) {
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583 if (me.matchKey(key)) {
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584 return me.value();
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585 }
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586 }
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587 return null;
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588 }
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589 }
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590
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591 private static class MetadataInspector extends ErrorHandlingInspector implements RevlogStream.Inspector {
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592 private final Metadata metadata;
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593 private final Path fname; // need this only for error reporting
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594 private final RevlogStream.Inspector delegate;
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595
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596 public MetadataInspector(Metadata _metadata, Path file, RevlogStream.Inspector chain) {
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597 metadata = _metadata;
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598 fname = file;
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599 delegate = chain;
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600 setCancelSupport(CancelSupport.Factory.get(chain));
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601 }
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602
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603 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess data) throws HgException {
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604 try {
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605 final int daLength = data.length();
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606 if (daLength < 4 || data.readByte() != 1 || data.readByte() != 10) {
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607 metadata.recordNone(revisionNumber);
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608 data.reset();
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609 } else {
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610 ArrayList<MetadataEntry> _metadata = new ArrayList<MetadataEntry>();
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611 int offset = parseMetadata(data, daLength, _metadata);
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612 metadata.add(revisionNumber, offset, _metadata);
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613 // da is in prepared state (i.e. we consumed all bytes up to metadata end).
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614 // However, it's not safe to assume delegate won't call da.reset() for some reason,
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615 // and we need to ensure predictable result.
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616 data.reset();
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617 data = new FilterDataAccess(data, offset, daLength - offset);
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618 }
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619 if (delegate != null) {
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620 delegate.next(revisionNumber, actualLen, baseRevision, linkRevision, parent1Revision, parent2Revision, nodeid, data);
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621 }
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622 } catch (IOException ex) {
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623 recordFailure(ex);
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624 } catch (HgDataStreamException ex) {
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625 recordFailure(ex.setRevisionIndex(revisionNumber));
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626 }
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627 }
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628
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629 private int parseMetadata(DataAccess data, final int daLength, ArrayList<MetadataEntry> _metadata) throws IOException, HgDataStreamException {
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630 int lastEntryStart = 2;
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631 int lastColon = -1;
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632 // XXX in fact, need smth like ByteArrayBuilder, similar to StringBuilder,
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633 // which can't be used here because we can't convert bytes to chars as we read them
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634 // (there might be multi-byte encoding), and we need to collect all bytes before converting to string
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635 ByteArrayOutputStream bos = new ByteArrayOutputStream();
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636 String key = null, value = null;
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637 boolean byteOne = false;
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638 boolean metadataIsComplete = false;
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639 for (int i = 2; i < daLength; i++) {
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640 byte b = data.readByte();
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641 if (b == '\n') {
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642 if (byteOne) { // i.e. \n follows 1
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643 lastEntryStart = i+1;
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644 metadataIsComplete = true;
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645 // XXX is it possible to have here incomplete key/value (i.e. if last pair didn't end with \n)
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646 // if yes, need to set metadataIsComplete to true in that case as well
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647 break;
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648 }
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649 if (key == null || lastColon == -1 || i <= lastColon) {
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650 throw new IllegalStateException(); // FIXME log instead and record null key in the metadata. Ex just to fail fast during dev
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651 }
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652 value = new String(bos.toByteArray()).trim();
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653 bos.reset();
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654 _metadata.add(new MetadataEntry(key, value));
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655 key = value = null;
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656 lastColon = -1;
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657 lastEntryStart = i+1;
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658 continue;
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659 }
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660 // byteOne has to be consumed up to this line, if not yet, consume it
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661 if (byteOne) {
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662 // insert 1 we've read on previous step into the byte builder
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663 bos.write(1);
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664 byteOne = false;
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665 // fall-through to consume current byte
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666 }
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667 if (b == (int) ':') {
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668 assert value == null;
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669 key = new String(bos.toByteArray());
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670 bos.reset();
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671 lastColon = i;
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672 } else if (b == 1) {
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673 byteOne = true;
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674 } else {
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675 bos.write(b);
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676 }
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677 }
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678 // data.isEmpty is not reliable, renamed files of size==0 keep only metadata
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679 if (!metadataIsComplete) {
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680 // XXX perhaps, worth a testcase (empty file, renamed, read or ask ifCopy
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681 throw new HgDataStreamException(fname, "Metadata is not closed properly", null);
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682 }
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74e7493a042a Favor delegation over generalization
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683 return lastEntryStart;
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684 }
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685
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686 @Override
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687 public void checkFailed() throws HgException, IOException, CancelledException {
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688 super.checkFailed();
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689 if (delegate instanceof ErrorHandlingInspector) {
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690 // XXX need to add ErrorDestination and pass it around (much like CancelSupport get passed)
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691 // so that delegate would be able report its failures directly to caller without this hack
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692 ((ErrorHandlingInspector) delegate).checkFailed();
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693 }
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694 }
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695 }
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696 }