Mercurial > hg4j

annotate src/org/tmatesoft/hg/repo/HgDataFile.java @ 355:f2c11fe7f3e9

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Newline filter shall respect whole stream when deciding whether to process line terminators, hence added stream preview functionality
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 06 Dec 2011 12:57:21 +0100
parents 5f9073eabf06
children 189dc6dc1c3e
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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.wrongLocalRevision;
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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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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(getLocalRevision(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 argument doesn't represent revision index in 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(getLocalRevision(nodeid));
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101 }
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102
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103 /**
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104 * @return size of the file content at the revision identified by local revision number.
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105 * @throws HgInvalidRevisionException if supplied argument doesn't represent revision index in this revlog
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106 * @throws HgDataStreamException if attempt to access file metadata failed
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107 * @throws HgInvalidControlFileException if access to revlog index/data entry failed
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108 */
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109 public int length(int localRev) throws HgDataStreamException, HgInvalidControlFileException, HgInvalidRevisionException {
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110 if (metadata == null || !metadata.checked(localRev)) {
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111 checkAndRecordMetadata(localRev);
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112 }
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113 final int dataLen = content.dataLength(localRev);
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114 if (metadata.known(localRev)) {
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115 return dataLen - metadata.dataOffset(localRev);
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116 }
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117 return dataLen;
22
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118 }
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119
237
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120 /**
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121 * Reads content of the file from working directory. If file present in the working directory, its actual content without
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122 * 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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123 * as if it would be refreshed in the working copy, i.e. its corresponding revision
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124 * (XXX according to dirstate? file tip?) is read from the repository, and filters repo -> working copy get applied.
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125 *
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126 * @param sink where to pipe content to
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127 * @throws HgDataStreamException to indicate troubles reading repository file
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128 * @throws CancelledException if operation was cancelled
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129 */
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130 public void workingCopy(ByteChannel sink) throws HgDataStreamException, CancelledException {
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131 File f = getRepo().getFile(this);
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132 if (f.exists()) {
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133 final CancelSupport cs = CancelSupport.Factory.get(sink);
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134 final ProgressSupport progress = ProgressSupport.Factory.get(sink);
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135 final long flength = f.length();
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136 final int bsize = (int) Math.min(flength, 32*1024);
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137 progress.start((int) (flength > Integer.MAX_VALUE ? flength >>> 15 /*32 kb buf size*/ : flength));
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138 ByteBuffer buf = ByteBuffer.allocate(bsize);
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139 FileChannel fc = null;
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140 try {
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141 fc = new FileInputStream(f).getChannel();
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142 while (fc.read(buf) != -1) {
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143 cs.checkCancelled();
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144 buf.flip();
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145 int consumed = sink.write(buf);
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146 progress.worked(flength > Integer.MAX_VALUE ? 1 : consumed);
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147 buf.compact();
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148 }
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149 } catch (IOException ex) {
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150 throw new HgDataStreamException(getPath(), ex);
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151 } finally {
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152 progress.done();
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153 if (fc != null) {
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154 try {
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155 fc.close();
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156 } catch (IOException ex) {
295
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157 getRepo().getContext().getLog().info(getClass(), ex, null);
237
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158 }
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159 }
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160 }
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161 } else {
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162 // FIXME not TIP, but revision according to dirstate!!!
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163 // add tests for this case
237
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164 contentWithFilters(TIP, sink);
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165 }
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166 }
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167
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168 // public void content(int revision, ByteChannel sink, boolean applyFilters) throws HgDataStreamException, IOException, CancelledException {
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169 // byte[] content = content(revision);
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170 // final CancelSupport cancelSupport = CancelSupport.Factory.get(sink);
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171 // final ProgressSupport progressSupport = ProgressSupport.Factory.get(sink);
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172 // ByteBuffer buf = ByteBuffer.allocate(512);
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173 // int left = content.length;
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174 // progressSupport.start(left);
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175 // int offset = 0;
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176 // cancelSupport.checkCancelled();
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177 // ByteChannel _sink = applyFilters ? new FilterByteChannel(sink, getRepo().getFiltersFromRepoToWorkingDir(getPath())) : sink;
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178 // do {
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179 // buf.put(content, offset, Math.min(left, buf.remaining()));
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180 // buf.flip();
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181 // cancelSupport.checkCancelled();
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182 // // XXX I may not rely on returned number of bytes but track change in buf position instead.
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183 // int consumed = _sink.write(buf);
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184 // buf.compact();
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185 // offset += consumed;
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186 // left -= consumed;
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187 // progressSupport.worked(consumed);
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188 // } while (left > 0);
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189 // progressSupport.done(); // XXX shall specify whether #done() is invoked always or only if completed successfully.
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190 // }
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191
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192 /*XXX not sure distinct method contentWithFilters() is the best way to do, perhaps, callers shall add filters themselves?*/
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193 public void contentWithFilters(int revision, ByteChannel sink) throws HgDataStreamException, CancelledException, HgInvalidRevisionException {
237
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194 if (revision == WORKING_COPY) {
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195 workingCopy(sink); // pass un-mangled sink
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196 } else {
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197 content(revision, new FilterByteChannel(sink, getRepo().getFiltersFromRepoToWorkingDir(getPath())));
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198 }
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199 }
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200
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201 // for data files need to check heading of the file content for possible metadata
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202 // @see http://mercurial.selenic.com/wiki/FileFormats#data.2BAC8-
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203 public void content(int revision, ByteChannel sink) throws HgDataStreamException, CancelledException, HgInvalidRevisionException {
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204 if (revision == TIP) {
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205 revision = getLastRevision();
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206 }
157
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207 if (revision == WORKING_COPY) {
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208 // sink is supposed to come into workingCopy without filters
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209 // thus we shall not get here (into #content) from #contentWithFilters(WC)
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210 workingCopy(sink);
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211 return;
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212 }
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213 if (wrongLocalRevision(revision) || revision == BAD_REVISION) {
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214 throw new HgInvalidRevisionException(revision);
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215 }
157
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216 if (sink == null) {
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217 throw new IllegalArgumentException();
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218 }
134
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219 if (metadata == null) {
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220 metadata = new Metadata();
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221 }
277
74e7493a042a Favor delegation over generalization
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222 ErrorHandlingInspector insp;
134
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223 if (metadata.none(revision)) {
355
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224 insp = new ContentPipe(sink, 0, getRepo().getContext().getLog());
157
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225 } else if (metadata.known(revision)) {
355
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226 insp = new ContentPipe(sink, metadata.dataOffset(revision), getRepo().getContext().getLog());
157
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227 } else {
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228 // do not know if there's metadata
355
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229 insp = new MetadataInspector(metadata, getPath(), new ContentPipe(sink, 0, getRepo().getContext().getLog()));
78
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230 }
157
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231 insp.checkCancelled();
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232 super.content.iterate(revision, revision, true, insp);
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233 try {
237
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234 insp.checkFailed(); // XXX is there real need to throw IOException from ContentPipe?
157
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235 } catch (HgDataStreamException ex) {
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236 throw ex;
237
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237 } catch (IOException ex) {
323
4c7e3ba67213 Exception when analyzing metadata of an empty renamed file
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238 throw new HgDataStreamException(getPath(), ex).setRevisionNumber(revision);
157
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239 } catch (HgException ex) {
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240 // shall not happen, unless we changed ContentPipe or its subclass
215
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241 throw new HgDataStreamException(getPath(), ex.getClass().getName(), ex);
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242 }
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243 }
157
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244
317
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245 private static class HistoryNode {
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246 int changeset;
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247 Nodeid cset;
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248 HistoryNode parent1, parent2;
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249 List<HistoryNode> children;
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250
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251 HistoryNode(int cs, HistoryNode p1, HistoryNode p2) {
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252 changeset = cs;
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253 parent1 = p1;
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254 parent2 = p2;
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255 if (p1 != null) {
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256 p1.addChild(this);
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257 }
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258 if (p2 != null) {
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259 p2.addChild(this);
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260 }
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261 }
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262
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263 Nodeid changesetRevision() {
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264 assert cset != null : "we initialize all csets prior to use";
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265 return cset;
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266 }
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267
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268 void addChild(HistoryNode child) {
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269 if (children == null) {
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270 children = new ArrayList<HistoryNode>(2);
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271 }
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272 children.add(child);
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273 }
305
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274 }
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275
328
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276 /**
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277 * @deprecated use {@link HgLogCommand#execute(org.tmatesoft.hg.core.HgChangesetTreeHandler)} instead
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278 */
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279 @Deprecated
317
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280 public void history(HgChangelog.TreeInspector inspector) {
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281 final CancelSupport cancelSupport = CancelSupport.Factory.get(inspector);
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282 try {
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283 final boolean[] needsSorting = { false };
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284 final HistoryNode[] completeHistory = new HistoryNode[getRevisionCount()];
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285 final int[] commitRevisions = new int[completeHistory.length];
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286 RevlogStream.Inspector insp = new RevlogStream.Inspector() {
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287 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess data) {
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288 if (revisionNumber > 0) {
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289 if (commitRevisions[revisionNumber-1] > linkRevision) {
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290 needsSorting[0] = true;
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291 }
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292 }
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293 commitRevisions[revisionNumber] = linkRevision;
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294 HistoryNode p1 = null, p2 = null;
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295 if (parent1Revision != -1) {
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296 p1 = completeHistory[parent1Revision];
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297 }
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298 if (parent2Revision != -1) {
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299 p2 = completeHistory[parent2Revision];
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300 }
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301 completeHistory[revisionNumber] = new HistoryNode(linkRevision, p1, p2);
305
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302 }
317
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303 };
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304 content.iterate(0, getLastRevision(), false, insp);
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305 cancelSupport.checkCancelled();
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306 if (needsSorting[0]) {
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307 Arrays.sort(commitRevisions);
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308 }
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309 // read changeset revisions at once (to avoid numerous changelog.getRevision reads)
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310 // but just nodeids, not RawChangeset (changelog.iterate(data=false)
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311 ArrayList<Nodeid> changesetRevisions = new ArrayList<Nodeid>(commitRevisions.length);
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312 getRepo().getChangelog().getRevisionsInternal(changesetRevisions, commitRevisions);
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diff changeset
313 cancelSupport.checkCancelled();
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314 // assign them to corresponding HistoryNodes
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315 for (int i = 0; i < completeHistory.length; i++ ) {
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diff changeset
316 final HistoryNode n = completeHistory[i];
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317 if (needsSorting[0]) {
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diff changeset
318 int x = Arrays.binarySearch(commitRevisions, n.changeset);
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319 assert x >= 0;
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320 n.cset = changesetRevisions.get(x);
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321 } else {
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322 // commit revisions were not sorted, may use original index directly
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323 n.cset = changesetRevisions.get(i);
305
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324 }
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325 }
317
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326 cancelSupport.checkCancelled();
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327 // XXX shall sort completeHistory according to changeset numbers?
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328 for (int i = 0; i < completeHistory.length; i++ ) {
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329 final HistoryNode n = completeHistory[i];
305
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diff changeset
330 HistoryNode p;
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331 Nodeid p1, p2;
317
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332 if ((p = n.parent1) != null) {
305
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333 p1 = p.changesetRevision();
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334 } else {
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335 p1 = Nodeid.NULL;
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336 }
317
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337 if ((p= n.parent2) != null) {
305
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338 p2 = p.changesetRevision();
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339 } else {
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340 p2 = Nodeid.NULL;
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341 }
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342 final Pair<Nodeid, Nodeid> parentChangesets = new Pair<Nodeid, Nodeid>(p1, p2);
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343 final List<Nodeid> childChangesets;
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344 if (n.children == null) {
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345 childChangesets = Collections.emptyList();
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346 } else {
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347 Nodeid[] revisions = new Nodeid[n.children.size()];
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348 int j = 0;
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349 for (HistoryNode hn : n.children) {
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350 revisions[j++] = hn.changesetRevision();
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351 }
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352 childChangesets = Arrays.asList(revisions);
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353 }
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354 inspector.next(n.changesetRevision(), parentChangesets, childChangesets);
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355 cancelSupport.checkCancelled();
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356 }
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357 } catch (CancelledException ex) {
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358 return;
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359 }
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360 }
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361
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362 public void history(HgChangelog.Inspector inspector) {
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363 history(0, getLastRevision(), inspector);
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364 }
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365
347
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366 public void history(int start, int end, HgChangelog.Inspector inspector) throws HgInvalidRevisionException {
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367 if (!exists()) {
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368 throw new IllegalStateException("Can't get history of invalid repository file node");
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369 }
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370 final int last = getLastRevision();
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371 if (end == TIP) {
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372 end = last;
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373 }
300
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374 if (start == TIP) {
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375 start = last;
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376 }
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377 HgInternals.checkRevlogRange(start, end, last);
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378
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379 final int[] commitRevisions = new int[end - start + 1];
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380 final boolean[] needsSorting = { false };
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381 RevlogStream.Inspector insp = new RevlogStream.Inspector() {
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382 int count = 0;
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383 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess data) {
242
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384 if (count > 0) {
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385 if (commitRevisions[count -1] > linkRevision) {
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386 needsSorting[0] = true;
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387 }
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388 }
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389 commitRevisions[count++] = linkRevision;
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390 }
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391 };
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392 content.iterate(start, end, false, insp);
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393 final HgChangelog changelog = getRepo().getChangelog();
242
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394 if (needsSorting[0]) {
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395 // automatic tools (svnmerge?) produce unnatural file history
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396 // (e.g. cpython/Lib/doctest.py, revision 164 points to cset 63509, 165 - to 38453)
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397 Arrays.sort(commitRevisions);
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398 }
245
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399 changelog.rangeInternal(inspector, commitRevisions);
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400 }
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401
354
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402 /**
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403 * For a given local revision of the file, find out local revision in the changelog.
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404 * FIXME rename to getChangesetRevisionIndex()
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405 *
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406 * @return changeset revision index
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407 * @throws HgInvalidRevisionException if supplied argument doesn't represent revision index in this revlog
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408 * @throws HgInvalidControlFileException if access to revlog index/data entry failed
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409 */
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410 public int getChangesetLocalRevision(int revision) throws HgInvalidControlFileException, HgInvalidRevisionException {
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411 return content.linkRevision(revision);
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412 }
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413
354
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414 /**
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415 * Complements {@link #getChangesetLocalRevision(int)} to get changeset revision that corresponds to supplied file revision
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416 *
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417 * @param nid revision of the file
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418 * @return changeset revision
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419 * @throws HgInvalidRevisionException if supplied argument doesn't represent revision index in this revlog
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420 * @throws HgInvalidControlFileException if access to revlog index/data entry failed
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421 */
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422 public Nodeid getChangesetRevision(Nodeid nid) throws HgInvalidControlFileException, HgInvalidRevisionException {
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423 int changelogRevision = getChangesetLocalRevision(getLocalRevision(nid));
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424 return getRepo().getChangelog().getRevision(changelogRevision);
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425 }
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426
354
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427 /**
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428 *
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429 * @return
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430 * @throws HgDataStreamException if attempt to access file metadata failed
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431 */
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diff changeset
432 public boolean isCopy() throws HgDataStreamException {
134
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433 if (metadata == null || !metadata.checked(0)) {
275
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diff changeset
434 checkAndRecordMetadata(0);
78
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435 }
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436 if (!metadata.known(0)) {
78
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437 return false;
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438 }
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439 return metadata.find(0, "copy") != null;
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440 }
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441
354
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442 /**
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443 * Get name of the file this one was copied from.
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444 *
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445 * @return name of the file origin
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446 * @throws HgDataStreamException if attempt to access file metadata failed
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447 * @throws UnsupportedOperationException if this file doesn't represent a copy ({@link #isCopy()} was false)
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diff changeset
448 */
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diff changeset
449 public Path getCopySourceName() throws HgDataStreamException {
78
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450 if (isCopy()) {
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451 return Path.create(metadata.find(0, "copy"));
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452 }
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diff changeset
453 throw new UnsupportedOperationException(); // XXX REVISIT, think over if Exception is good (clients would check isCopy() anyway, perhaps null is sufficient?)
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454 }
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diff changeset
455
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diff changeset
456 public Nodeid getCopySourceRevision() throws HgDataStreamException {
78
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457 if (isCopy()) {
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458 return Nodeid.fromAscii(metadata.find(0, "copyrev")); // XXX reuse/cache Nodeid
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459 }
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460 throw new UnsupportedOperationException();
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461 }
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462
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463 @Override
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464 public String toString() {
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465 StringBuilder sb = new StringBuilder(getClass().getSimpleName());
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466 sb.append('(');
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467 sb.append(getPath());
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468 sb.append(')');
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469 return sb.toString();
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470 }
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471
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472 private void checkAndRecordMetadata(int localRev) throws HgDataStreamException {
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473 // content() always initializes metadata.
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474 // FIXME this is expensive way to find out metadata, distinct RevlogStream.Iterator would be better.
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475 // Alternatively, may parameterize MetadataContentPipe to do prepare only.
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476 // For reference, when throwing CancelledException, hg status -A --rev 3:80 takes 70 ms
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477 // however, if we just consume buffer instead (buffer.position(buffer.limit()), same command takes ~320ms
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478 // (compared to command-line counterpart of 190ms)
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479 try {
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480 content(localRev, new ByteChannel() { // No-op channel
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481 public int write(ByteBuffer buffer) throws IOException, CancelledException {
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482 throw new CancelledException();
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483 }
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484 });
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485 } catch (CancelledException ex) {
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486 // it's ok, we did that
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487 }
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488 }
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489
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490 private static final class MetadataEntry {
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491 private final String entry;
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492 private final int valueStart;
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493 /*package-local*/MetadataEntry(String key, String value) {
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494 entry = key + value;
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495 valueStart = key.length();
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496 }
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497 /*package-local*/boolean matchKey(String key) {
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498 return key.length() == valueStart && entry.startsWith(key);
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499 }
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500 // uncomment once/if needed
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501 // public String key() {
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502 // return entry.substring(0, valueStart);
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503 // }
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504 public String value() {
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505 return entry.substring(valueStart);
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506 }
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507 }
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508
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509 private static class Metadata {
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510 private static class Record {
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511 public final int offset;
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512 public final MetadataEntry[] entries;
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513
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514 public Record(int off, MetadataEntry[] entr) {
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515 offset = off;
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516 entries = entr;
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517 }
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518 }
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519 // XXX sparse array needed
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520 private final IntMap<Record> entries = new IntMap<Record>(5);
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521
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522 private final Record NONE = new Record(-1, null); // don't want statics
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523
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524 // true when there's metadata for given revision
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525 boolean known(int revision) {
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526 Record i = entries.get(revision);
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527 return i != null && NONE != i;
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528 }
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529
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530 // true when revision has been checked for metadata presence.
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531 public boolean checked(int revision) {
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532 return entries.containsKey(revision);
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533 }
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534
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535 // true when revision has been checked and found not having any metadata
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536 boolean none(int revision) {
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537 Record i = entries.get(revision);
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538 return i == NONE;
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539 }
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540
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541 // mark revision as having no metadata.
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542 void recordNone(int revision) {
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543 Record i = entries.get(revision);
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544 if (i == NONE) {
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545 return; // already there
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546 }
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547 if (i != null) {
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548 throw new IllegalStateException(String.format("Trying to override Metadata state for revision %d (known offset: %d)", revision, i));
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549 }
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550 entries.put(revision, NONE);
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551 }
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552
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553 // since this is internal class, callers are supposed to ensure arg correctness (i.e. ask known() before)
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554 int dataOffset(int revision) {
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555 return entries.get(revision).offset;
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556 }
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557 void add(int revision, int dataOffset, Collection<MetadataEntry> e) {
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558 assert !entries.containsKey(revision);
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559 entries.put(revision, new Record(dataOffset, e.toArray(new MetadataEntry[e.size()])));
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560 }
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561
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562 String find(int revision, String key) {
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563 for (MetadataEntry me : entries.get(revision).entries) {
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564 if (me.matchKey(key)) {
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diff changeset
565 return me.value();
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566 }
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567 }
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568 return null;
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569 }
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570 }
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571
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572 private static class MetadataInspector extends ErrorHandlingInspector implements RevlogStream.Inspector {
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573 private final Metadata metadata;
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574 private final Path fname; // need this only for error reporting
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575 private final RevlogStream.Inspector delegate;
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576
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577 public MetadataInspector(Metadata _metadata, Path file, RevlogStream.Inspector chain) {
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578 metadata = _metadata;
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579 fname = file;
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580 delegate = chain;
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581 setCancelSupport(CancelSupport.Factory.get(chain));
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582 }
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583
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584 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess data) {
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585 try {
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586 final int daLength = data.length();
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587 if (daLength < 4 || data.readByte() != 1 || data.readByte() != 10) {
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588 metadata.recordNone(revisionNumber);
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589 data.reset();
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590 } else {
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591 ArrayList<MetadataEntry> _metadata = new ArrayList<MetadataEntry>();
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592 int offset = parseMetadata(data, daLength, _metadata);
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593 metadata.add(revisionNumber, offset, _metadata);
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594 // da is in prepared state (i.e. we consumed all bytes up to metadata end).
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595 // However, it's not safe to assume delegate won't call da.reset() for some reason,
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596 // and we need to ensure predictable result.
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597 data.reset();
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598 data = new FilterDataAccess(data, offset, daLength - offset);
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599 }
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600 if (delegate != null) {
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601 delegate.next(revisionNumber, actualLen, baseRevision, linkRevision, parent1Revision, parent2Revision, nodeid, data);
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602 }
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603 } catch (IOException ex) {
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604 recordFailure(ex);
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605 } catch (HgDataStreamException ex) {
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606 recordFailure(ex.setRevisionNumber(revisionNumber));
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607 }
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608 }
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609
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610 private int parseMetadata(DataAccess data, final int daLength, ArrayList<MetadataEntry> _metadata) throws IOException, HgDataStreamException {
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611 int lastEntryStart = 2;
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612 int lastColon = -1;
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613 // XXX in fact, need smth like ByteArrayBuilder, similar to StringBuilder,
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614 // which can't be used here because we can't convert bytes to chars as we read them
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615 // (there might be multi-byte encoding), and we need to collect all bytes before converting to string
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616 ByteArrayOutputStream bos = new ByteArrayOutputStream();
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617 String key = null, value = null;
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618 boolean byteOne = false;
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619 boolean metadataIsComplete = false;
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620 for (int i = 2; i < daLength; i++) {
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621 byte b = data.readByte();
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622 if (b == '\n') {
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623 if (byteOne) { // i.e. \n follows 1
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624 lastEntryStart = i+1;
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625 metadataIsComplete = true;
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626 // XXX is it possible to have here incomplete key/value (i.e. if last pair didn't end with \n)
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627 // if yes, need to set metadataIsComplete to true in that case as well
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628 break;
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629 }
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630 if (key == null || lastColon == -1 || i <= lastColon) {
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631 throw new IllegalStateException(); // FIXME log instead and record null key in the metadata. Ex just to fail fast during dev
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632 }
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633 value = new String(bos.toByteArray()).trim();
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634 bos.reset();
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635 _metadata.add(new MetadataEntry(key, value));
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636 key = value = null;
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637 lastColon = -1;
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638 lastEntryStart = i+1;
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639 continue;
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640 }
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641 // byteOne has to be consumed up to this line, if not yet, consume it
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642 if (byteOne) {
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643 // insert 1 we've read on previous step into the byte builder
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644 bos.write(1);
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645 byteOne = false;
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646 // fall-through to consume current byte
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647 }
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648 if (b == (int) ':') {
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649 assert value == null;
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650 key = new String(bos.toByteArray());
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651 bos.reset();
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652 lastColon = i;
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653 } else if (b == 1) {
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654 byteOne = true;
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655 } else {
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656 bos.write(b);
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657 }
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658 }
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659 // data.isEmpty is not reliable, renamed files of size==0 keep only metadata
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660 if (!metadataIsComplete) {
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661 // XXX perhaps, worth a testcase (empty file, renamed, read or ask ifCopy
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662 throw new HgDataStreamException(fname, "Metadata is not closed properly", null);
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663 }
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664 return lastEntryStart;
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665 }
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666
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667 @Override
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668 public void checkFailed() throws HgException, IOException, CancelledException {
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669 super.checkFailed();
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670 if (delegate instanceof ErrorHandlingInspector) {
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671 // XXX need to add ErrorDestination and pass it around (much like CancelSupport get passed)
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672 // so that delegate would be able report its failures directly to caller without this hack
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673 ((ErrorHandlingInspector) delegate).checkFailed();
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674 }
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675 }
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676 }
2
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677 }