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annotate src/org/tmatesoft/hg/repo/HgDataFile.java @ 396:0ae53c32ecef

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Straighten out exceptions thrown when file access failed - three is too much
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Thu, 23 Feb 2012 01:06:24 +0100
parents b015f3918120
children a57a21aa4190
rev   line source
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1 /*
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2 * Copyright (c) 2010-2012 TMate Software Ltd
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3 *
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4 * This program is free software; you can redistribute it and/or modify
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5 * it under the terms of the GNU General Public License as published by
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6 * the Free Software Foundation; version 2 of the License.
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7 *
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8 * This program is distributed in the hope that it will be useful,
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9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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11 * GNU General Public License for more details.
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12 *
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13 * For information on how to redistribute this software under
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14 * the terms of a license other than GNU General Public License
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15 * contact TMate Software at support@hg4j.com
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16 */
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17 package org.tmatesoft.hg.repo;
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19 import static org.tmatesoft.hg.repo.HgInternals.wrongRevisionIndex;
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20 import static org.tmatesoft.hg.repo.HgRepository.*;
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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.HgException;
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35 import org.tmatesoft.hg.core.HgInvalidControlFileException;
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36 import org.tmatesoft.hg.core.HgInvalidFileException;
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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.LogFacility;
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49 import org.tmatesoft.hg.util.Pair;
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50 import org.tmatesoft.hg.util.Path;
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51 import org.tmatesoft.hg.util.ProgressSupport;
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52
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55 /**
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56 * ? name:HgFileNode?
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57 *
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58 * @author Artem Tikhomirov
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59 * @author TMate Software Ltd.
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60 */
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61 public class HgDataFile extends Revlog {
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62
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63 // absolute from repo root?
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64 // slashes, unix-style?
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65 // repo location agnostic, just to give info to user, not to access real storage
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66 private final Path path;
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67 private Metadata metadata; // get initialized on first access to file content.
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69 /*package-local*/HgDataFile(HgRepository hgRepo, Path filePath, RevlogStream content) {
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70 super(hgRepo, content);
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71 path = filePath;
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72 }
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74 /*package-local*/HgDataFile(HgRepository hgRepo, Path filePath) {
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75 super(hgRepo);
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76 path = filePath;
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77 }
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79 // exists is not the best name possible. now it means no file with such name was ever known to the repo.
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80 // it might be confused with files existed before but lately removed.
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81 public boolean exists() {
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82 return content != null; // XXX need better impl
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83 }
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84
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85 // human-readable (i.e. "COPYING", not "store/data/_c_o_p_y_i_n_g.i")
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86 public Path getPath() {
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87 return path; // hgRepo.backresolve(this) -> name? In this case, what about hashed long names?
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88 }
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89
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90 /**
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91 * Handy shorthand for {@link #length(int) length(getRevisionIndex(nodeid))}
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92 *
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93 * @param nodeid revision of the file
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94 *
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95 * @return size of the file content at the given revision
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96 * @throws HgInvalidRevisionException if supplied nodeid doesn't identify any revision from this revlog (<em>runtime exception</em>)
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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 HgInvalidControlFileException, HgInvalidRevisionException {
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100 try {
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101 return length(getRevisionIndex(nodeid));
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102 } catch (HgInvalidControlFileException ex) {
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103 throw ex.isRevisionSet() ? ex : ex.setRevision(nodeid);
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104 } catch (HgInvalidRevisionException ex) {
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105 throw ex.isRevisionSet() ? ex : ex.setRevision(nodeid);
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106 }
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107 }
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109 /**
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110 * @param fileRevisionIndex - revision local index, non-negative. From predefined constants, only {@link HgRepository#TIP} makes sense.
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111 * @return size of the file content at the revision identified by local revision number.
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112 * @throws HgInvalidRevisionException if supplied argument doesn't represent revision index in this revlog (<em>runtime exception</em>)
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113 * @throws HgInvalidControlFileException if access to revlog index/data entry failed
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114 */
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115 public int length(int fileRevisionIndex) throws HgInvalidControlFileException, HgInvalidRevisionException {
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116 // FIXME support WORKING_COPY constant
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117 if (metadata == null || !metadata.checked(fileRevisionIndex)) {
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118 checkAndRecordMetadata(fileRevisionIndex);
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119 }
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120 final int dataLen = content.dataLength(fileRevisionIndex);
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121 if (metadata.known(fileRevisionIndex)) {
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122 return dataLen - metadata.dataOffset(fileRevisionIndex);
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123 }
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124 return dataLen;
22
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125 }
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126
237
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127 /**
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128 * Reads content of the file from working directory. If file present in the working directory, its actual content without
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129 * 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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130 * as if it would be refreshed in the working copy, i.e. its corresponding revision
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131 * (XXX according to dirstate? file tip?) is read from the repository, and filters repo -> working copy get applied.
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132 *
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133 * @param sink content consumer
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134 * @throws HgInvalidControlFileException if access to revlog index/data entry failed
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135 * @throws HgInvalidFileException if access to file in working directory failed
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136 * @throws CancelledException if execution of the operation was cancelled
237
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137 */
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138 public void workingCopy(ByteChannel sink) throws HgException, CancelledException {
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139 File f = getRepo().getFile(this);
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140 if (f.exists()) {
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141 final CancelSupport cs = CancelSupport.Factory.get(sink);
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142 final ProgressSupport progress = ProgressSupport.Factory.get(sink);
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143 final long flength = f.length();
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144 final int bsize = (int) Math.min(flength, 32*1024);
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145 progress.start((int) (flength > Integer.MAX_VALUE ? flength >>> 15 /*32 kb buf size*/ : flength));
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146 ByteBuffer buf = ByteBuffer.allocate(bsize);
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147 FileChannel fc = null;
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148 try {
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149 fc = new FileInputStream(f).getChannel();
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150 while (fc.read(buf) != -1) {
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151 cs.checkCancelled();
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152 buf.flip();
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153 int consumed = sink.write(buf);
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154 progress.worked(flength > Integer.MAX_VALUE ? 1 : consumed);
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155 buf.compact();
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156 }
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157 } catch (IOException ex) {
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158 throw new HgInvalidFileException("Working copy read failed", ex, f);
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159 } finally {
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160 progress.done();
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161 if (fc != null) {
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162 try {
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163 fc.close();
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164 } catch (IOException ex) {
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165 getRepo().getContext().getLog().info(getClass(), ex, null);
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166 }
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167 }
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168 }
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169 } else {
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170 final Pair<Nodeid, Nodeid> wcParents = getRepo().getWorkingCopyParents();
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171 Nodeid p = wcParents.first().isNull() ? wcParents.second() : wcParents.first();
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172 if (p.isNull()) {
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173 // no dirstate parents - no content
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174 // XXX what if it's repository with no dirstate? Shall I use TIP then?
388
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175 return;
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176 }
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177 final HgChangelog clog = getRepo().getChangelog();
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178 // common case to avoid searching complete changelog for nodeid match
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179 final Nodeid tipRev = clog.getRevision(TIP);
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180 final int csetRevIndex;
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181 if (tipRev.equals(p)) {
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182 csetRevIndex = clog.getLastRevision();
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183 } else {
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184 // bad luck, need to search honestly
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185 csetRevIndex = getRepo().getChangelog().getRevisionIndex(p);
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186 }
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187 Nodeid fileRev = getRepo().getManifest().getFileRevision(csetRevIndex, getPath());
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188 final int fileRevIndex = getRevisionIndex(fileRev);
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189 contentWithFilters(fileRevIndex, sink);
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190 }
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191 }
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192
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193 /**
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194 * Access content of a file revision
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195 * XXX not sure distinct method contentWithFilters() is the best way to do, perhaps, callers shall add filters themselves?
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196 *
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197 * @param fileRevisionIndex - revision local index, non-negative. From predefined constants, {@link HgRepository#TIP} and {@link HgRepository#WORKING_COPY} make sense.
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198 * @param sink content consumer
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199 *
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200 * @throws HgInvalidControlFileException if access to revlog index/data entry failed
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201 * @throws HgInvalidFileException if access to file in working directory failed
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202 * @throws CancelledException if execution of the operation was cancelled
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203 * @throws HgInvalidRevisionException if supplied argument doesn't represent revision index in this revlog (<em>runtime exception</em>)
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204 */
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205 public void contentWithFilters(int fileRevisionIndex, ByteChannel sink) throws HgException, CancelledException, HgInvalidRevisionException {
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206 if (fileRevisionIndex == WORKING_COPY) {
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207 workingCopy(sink); // pass un-mangled sink
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208 } else {
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209 content(fileRevisionIndex, new FilterByteChannel(sink, getRepo().getFiltersFromRepoToWorkingDir(getPath())));
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210 }
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211 }
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212
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213 /**
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214 * Retrieve content of specific revision. Content is provided as is, without any filters (e.g. keywords, eol, etc.) applied.
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215 * For filtered content, use {@link #contentWithFilters(int, ByteChannel)}.
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216 *
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217 * @param fileRevisionIndex - revision local index, non-negative. From predefined constants, {@link HgRepository#TIP} and {@link HgRepository#WORKING_COPY} make sense.
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218 * @param sink content consumer
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219 *
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220 * @throws HgInvalidControlFileException if access to revlog index/data entry failed
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221 * @throws HgInvalidFileException if access to file in working directory failed
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222 * @throws CancelledException if execution of the operation was cancelled
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223 * @throws HgInvalidRevisionException if supplied argument doesn't represent revision index in this revlog (<em>runtime exception</em>)
367
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224 */
396
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225 public void content(int fileRevisionIndex, ByteChannel sink) throws HgException, CancelledException, HgInvalidRevisionException {
367
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226 // for data files need to check heading of the file content for possible metadata
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227 // @see http://mercurial.selenic.com/wiki/FileFormats#data.2BAC8-
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228 if (fileRevisionIndex == TIP) {
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229 fileRevisionIndex = getLastRevision();
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230 }
367
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231 if (fileRevisionIndex == WORKING_COPY) {
237
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232 // sink is supposed to come into workingCopy without filters
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233 // thus we shall not get here (into #content) from #contentWithFilters(WC)
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234 workingCopy(sink);
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235 return;
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236 }
367
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237 if (wrongRevisionIndex(fileRevisionIndex) || fileRevisionIndex == BAD_REVISION) {
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238 throw new HgInvalidRevisionException(fileRevisionIndex);
148
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239 }
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240 if (sink == null) {
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241 throw new IllegalArgumentException();
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242 }
134
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243 if (metadata == null) {
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244 metadata = new Metadata();
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245 }
277
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246 ErrorHandlingInspector insp;
388
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247 final LogFacility lf = getRepo().getContext().getLog();
367
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248 if (metadata.none(fileRevisionIndex)) {
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249 insp = new ContentPipe(sink, 0, lf);
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250 } else if (metadata.known(fileRevisionIndex)) {
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251 insp = new ContentPipe(sink, metadata.dataOffset(fileRevisionIndex), lf);
157
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252 } else {
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253 // do not know if there's metadata
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254 insp = new MetadataInspector(metadata, lf, new ContentPipe(sink, 0, lf));
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255 }
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256 insp.checkCancelled();
367
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257 super.content.iterate(fileRevisionIndex, fileRevisionIndex, true, insp);
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258 try {
237
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259 insp.checkFailed(); // XXX is there real need to throw IOException from ContentPipe?
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260 } catch (HgInvalidControlFileException ex) {
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261 ex = ex.setFileName(getPath());
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262 throw ex.isRevisionIndexSet() ? ex : ex.setRevisionIndex(fileRevisionIndex);
237
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263 } catch (IOException ex) {
396
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264 HgInvalidControlFileException e = new HgInvalidControlFileException("Revision content access failed", ex, null);
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265 throw content.initWithIndexFile(e).setFileName(getPath()).setRevisionIndex(fileRevisionIndex);
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266 } catch (HgException ex) {
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267 // shall not happen, unless we changed ContentPipe or its subclass
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268 HgInvalidControlFileException e = new HgInvalidControlFileException("Revision content access failed", ex, null);
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269 throw content.initWithIndexFile(e).setFileName(getPath()).setRevisionIndex(fileRevisionIndex);
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270 }
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271 }
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272
317
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273 private static class HistoryNode {
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274 int changeset;
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275 Nodeid cset;
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276 HistoryNode parent1, parent2;
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277 List<HistoryNode> children;
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278
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279 HistoryNode(int cs, HistoryNode p1, HistoryNode p2) {
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280 changeset = cs;
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281 parent1 = p1;
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282 parent2 = p2;
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283 if (p1 != null) {
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284 p1.addChild(this);
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285 }
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286 if (p2 != null) {
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287 p2.addChild(this);
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288 }
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289 }
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290
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291 Nodeid changesetRevision() {
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292 assert cset != null : "we initialize all csets prior to use";
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293 return cset;
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294 }
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295
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296 void addChild(HistoryNode child) {
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297 if (children == null) {
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298 children = new ArrayList<HistoryNode>(2);
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299 }
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300 children.add(child);
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301 }
305
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302 }
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303
328
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304 /**
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305 * @deprecated use {@link HgLogCommand#execute(org.tmatesoft.hg.core.HgChangesetTreeHandler)} instead
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306 */
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307 @Deprecated
366
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308 public void history(HgChangelog.TreeInspector inspector) throws HgInvalidControlFileException{
317
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309 final CancelSupport cancelSupport = CancelSupport.Factory.get(inspector);
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310 try {
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311 final boolean[] needsSorting = { false };
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312 final HistoryNode[] completeHistory = new HistoryNode[getRevisionCount()];
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313 final int[] commitRevisions = new int[completeHistory.length];
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314 RevlogStream.Inspector insp = new RevlogStream.Inspector() {
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315 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess data) {
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316 if (revisionNumber > 0) {
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317 if (commitRevisions[revisionNumber-1] > linkRevision) {
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318 needsSorting[0] = true;
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319 }
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320 }
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321 commitRevisions[revisionNumber] = linkRevision;
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322 HistoryNode p1 = null, p2 = null;
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323 if (parent1Revision != -1) {
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324 p1 = completeHistory[parent1Revision];
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325 }
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326 if (parent2Revision != -1) {
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327 p2 = completeHistory[parent2Revision];
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328 }
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329 completeHistory[revisionNumber] = new HistoryNode(linkRevision, p1, p2);
305
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330 }
317
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331 };
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332 content.iterate(0, getLastRevision(), false, insp);
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333 cancelSupport.checkCancelled();
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334 if (needsSorting[0]) {
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335 Arrays.sort(commitRevisions);
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336 }
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337 // read changeset revisions at once (to avoid numerous changelog.getRevision reads)
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338 // but just nodeids, not RawChangeset (changelog.iterate(data=false)
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339 ArrayList<Nodeid> changesetRevisions = new ArrayList<Nodeid>(commitRevisions.length);
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340 getRepo().getChangelog().getRevisionsInternal(changesetRevisions, commitRevisions);
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341 cancelSupport.checkCancelled();
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342 // assign them to corresponding HistoryNodes
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343 for (int i = 0; i < completeHistory.length; i++ ) {
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344 final HistoryNode n = completeHistory[i];
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345 if (needsSorting[0]) {
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346 int x = Arrays.binarySearch(commitRevisions, n.changeset);
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347 assert x >= 0;
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348 n.cset = changesetRevisions.get(x);
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349 } else {
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350 // commit revisions were not sorted, may use original index directly
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351 n.cset = changesetRevisions.get(i);
305
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352 }
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353 }
317
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354 cancelSupport.checkCancelled();
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355 // XXX shall sort completeHistory according to changeset numbers?
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356 for (int i = 0; i < completeHistory.length; i++ ) {
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357 final HistoryNode n = completeHistory[i];
305
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358 HistoryNode p;
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359 Nodeid p1, p2;
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360 if ((p = n.parent1) != null) {
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361 p1 = p.changesetRevision();
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362 } else {
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363 p1 = Nodeid.NULL;
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364 }
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365 if ((p= n.parent2) != null) {
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366 p2 = p.changesetRevision();
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367 } else {
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368 p2 = Nodeid.NULL;
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369 }
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370 final Pair<Nodeid, Nodeid> parentChangesets = new Pair<Nodeid, Nodeid>(p1, p2);
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371 final List<Nodeid> childChangesets;
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372 if (n.children == null) {
317
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373 childChangesets = Collections.emptyList();
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374 } else {
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375 Nodeid[] revisions = new Nodeid[n.children.size()];
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376 int j = 0;
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377 for (HistoryNode hn : n.children) {
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378 revisions[j++] = hn.changesetRevision();
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379 }
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380 childChangesets = Arrays.asList(revisions);
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381 }
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382 inspector.next(n.changesetRevision(), parentChangesets, childChangesets);
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383 cancelSupport.checkCancelled();
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384 }
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385 } catch (CancelledException ex) {
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386 return;
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387 }
305
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388 }
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389
366
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390 public void history(HgChangelog.Inspector inspector) throws HgInvalidControlFileException {
135
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391 history(0, getLastRevision(), inspector);
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392 }
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393
366
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394 public void history(int start, int end, HgChangelog.Inspector inspector) throws HgInvalidRevisionException, HgInvalidControlFileException {
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395 if (!exists()) {
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396 throw new IllegalStateException("Can't get history of invalid repository file node");
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397 }
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398 final int last = getLastRevision();
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399 if (end == TIP) {
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400 end = last;
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401 }
300
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402 if (start == TIP) {
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403 start = last;
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404 }
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405 HgInternals.checkRevlogRange(start, end, last);
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406
48
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407 final int[] commitRevisions = new int[end - start + 1];
242
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408 final boolean[] needsSorting = { false };
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409 RevlogStream.Inspector insp = new RevlogStream.Inspector() {
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410 int count = 0;
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411 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess data) {
242
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412 if (count > 0) {
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413 if (commitRevisions[count -1] > linkRevision) {
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414 needsSorting[0] = true;
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415 }
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416 }
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417 commitRevisions[count++] = linkRevision;
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418 }
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419 };
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420 content.iterate(start, end, false, insp);
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421 final HgChangelog changelog = getRepo().getChangelog();
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422 if (needsSorting[0]) {
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423 // automatic tools (svnmerge?) produce unnatural file history
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424 // (e.g. cpython/Lib/doctest.py, revision 164 points to cset 63509, 165 - to 38453)
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425 Arrays.sort(commitRevisions);
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426 }
245
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427 changelog.rangeInternal(inspector, commitRevisions);
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428 }
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429
354
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430 /**
367
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431 * For a given revision of the file (identified with revision index), find out index of the corresponding changeset.
354
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432 *
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433 * @return changeset revision index
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434 * @throws HgInvalidRevisionException if supplied argument doesn't represent revision index in this revlog
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435 * @throws HgInvalidControlFileException if access to revlog index/data entry failed
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436 */
367
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437 public int getChangesetRevisionIndex(int revision) throws HgInvalidControlFileException, HgInvalidRevisionException {
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438 return content.linkRevision(revision);
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439 }
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440 /**
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441 * @deprecated use {@link #getChangesetRevisionIndex(int)} instead
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442 */
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443 @Deprecated
354
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444 public int getChangesetLocalRevision(int revision) throws HgInvalidControlFileException, HgInvalidRevisionException {
367
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445 return getChangesetRevisionIndex(revision);
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446 }
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447
354
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448 /**
367
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449 * Complements {@link #getChangesetRevisionIndex(int)} to get changeset revision that corresponds to supplied file revision
354
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450 *
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451 * @param nid revision of the file
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452 * @return changeset revision
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453 * @throws HgInvalidRevisionException if supplied argument doesn't represent revision index in this revlog
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454 * @throws HgInvalidControlFileException if access to revlog index/data entry failed
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455 */
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456 public Nodeid getChangesetRevision(Nodeid nid) throws HgInvalidControlFileException, HgInvalidRevisionException {
367
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457 int changelogRevision = getChangesetRevisionIndex(getRevisionIndex(nid));
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458 return getRepo().getChangelog().getRevision(changelogRevision);
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459 }
78
c25c5c348d1b Skip metadata in the beginning of a file content. Parse metadata, recognize copies/renames
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diff changeset
460
354
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diff changeset
461 /**
396
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diff changeset
462 * Tells whether this file originates from another repository file
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463 * @return <code>true</code> if this file is a copy of another from the repository
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464 * @throws HgInvalidControlFileException if access to revlog or file metadata failed
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465 */
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466 public boolean isCopy() throws HgInvalidControlFileException {
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467 if (metadata == null || !metadata.checked(0)) {
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468 checkAndRecordMetadata(0);
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469 }
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470 if (!metadata.known(0)) {
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471 return false;
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472 }
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473 return metadata.find(0, "copy") != null;
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474 }
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475
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476 /**
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477 * Get name of the file this one was copied from.
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478 *
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479 * @return name of the file origin
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480 * @throws HgInvalidControlFileException if access to revlog or file metadata failed
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481 * @throws UnsupportedOperationException if this file doesn't represent a copy ({@link #isCopy()} was false)
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482 */
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483 public Path getCopySourceName() throws HgInvalidControlFileException {
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484 if (isCopy()) {
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485 return Path.create(metadata.find(0, "copy"));
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486 }
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487 throw new UnsupportedOperationException(); // XXX REVISIT, think over if Exception is good (clients would check isCopy() anyway, perhaps null is sufficient?)
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488 }
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489
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490 public Nodeid getCopySourceRevision() throws HgInvalidControlFileException {
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491 if (isCopy()) {
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492 return Nodeid.fromAscii(metadata.find(0, "copyrev")); // XXX reuse/cache Nodeid
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493 }
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494 throw new UnsupportedOperationException();
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495 }
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496
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497 @Override
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498 public String toString() {
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499 StringBuilder sb = new StringBuilder(getClass().getSimpleName());
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500 sb.append('(');
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501 sb.append(getPath());
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502 sb.append(')');
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503 return sb.toString();
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504 }
275
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505
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506 private void checkAndRecordMetadata(int localRev) throws HgInvalidControlFileException {
275
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507 // content() always initializes metadata.
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508 // FIXME this is expensive way to find out metadata, distinct RevlogStream.Iterator would be better.
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509 // Alternatively, may parameterize MetadataContentPipe to do prepare only.
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510 // For reference, when throwing CancelledException, hg status -A --rev 3:80 takes 70 ms
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511 // however, if we just consume buffer instead (buffer.position(buffer.limit()), same command takes ~320ms
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512 // (compared to command-line counterpart of 190ms)
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513 try {
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514 content(localRev, new ByteChannel() { // No-op channel
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515 public int write(ByteBuffer buffer) throws IOException, CancelledException {
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516 throw new CancelledException();
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517 }
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518 });
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519 } catch (CancelledException ex) {
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520 // it's ok, we did that
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521 } catch (HgInvalidControlFileException ex) {
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522 throw ex.isRevisionIndexSet() ? ex : ex.setRevisionIndex(localRev);
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523 } catch (HgException ex) {
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524 // metadata comes from the content, hence initWithDataFile
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525 throw content.initWithDataFile(new HgInvalidControlFileException(null, ex, null));
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526 }
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527 }
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528
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529 private static final class MetadataEntry {
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530 private final String entry;
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531 private final int valueStart;
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532
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533 // key may be null
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534 /*package-local*/MetadataEntry(String key, String value) {
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535 if (key == null) {
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536 entry = value;
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537 valueStart = -1; // not 0 to tell between key == null and key == ""
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538 } else {
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539 entry = key + value;
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540 valueStart = key.length();
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541 }
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542 }
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543 /*package-local*/boolean matchKey(String key) {
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544 return key == null ? valueStart == -1 : key.length() == valueStart && entry.startsWith(key);
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545 }
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546 // uncomment once/if needed
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547 // public String key() {
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548 // return entry.substring(0, valueStart);
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549 // }
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550 public String value() {
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551 return valueStart == -1 ? entry : entry.substring(valueStart);
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552 }
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553 }
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554
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555 private static class Metadata {
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556 private static class Record {
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557 public final int offset;
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558 public final MetadataEntry[] entries;
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559
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560 public Record(int off, MetadataEntry[] entr) {
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561 offset = off;
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562 entries = entr;
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563 }
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564 }
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565 // XXX sparse array needed
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566 private final IntMap<Record> entries = new IntMap<Record>(5);
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567
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568 private final Record NONE = new Record(-1, null); // don't want statics
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569
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570 // true when there's metadata for given revision
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571 boolean known(int revision) {
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572 Record i = entries.get(revision);
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573 return i != null && NONE != i;
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574 }
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575
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576 // true when revision has been checked for metadata presence.
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577 public boolean checked(int revision) {
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578 return entries.containsKey(revision);
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579 }
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580
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581 // true when revision has been checked and found not having any metadata
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582 boolean none(int revision) {
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583 Record i = entries.get(revision);
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584 return i == NONE;
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585 }
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586
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587 // mark revision as having no metadata.
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588 void recordNone(int revision) {
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589 Record i = entries.get(revision);
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590 if (i == NONE) {
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591 return; // already there
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592 }
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593 if (i != null) {
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594 throw new IllegalStateException(String.format("Trying to override Metadata state for revision %d (known offset: %d)", revision, i));
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595 }
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596 entries.put(revision, NONE);
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597 }
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598
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599 // since this is internal class, callers are supposed to ensure arg correctness (i.e. ask known() before)
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600 int dataOffset(int revision) {
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601 return entries.get(revision).offset;
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602 }
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603 void add(int revision, int dataOffset, Collection<MetadataEntry> e) {
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604 assert !entries.containsKey(revision);
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605 entries.put(revision, new Record(dataOffset, e.toArray(new MetadataEntry[e.size()])));
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606 }
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607
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608 String find(int revision, String key) {
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609 for (MetadataEntry me : entries.get(revision).entries) {
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610 if (me.matchKey(key)) {
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611 return me.value();
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612 }
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613 }
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614 return null;
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615 }
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616 }
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617
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618 private static class MetadataInspector extends ErrorHandlingInspector implements RevlogStream.Inspector {
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619 private final Metadata metadata;
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620 private final RevlogStream.Inspector delegate;
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621 private final LogFacility log;
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622
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623 public MetadataInspector(Metadata _metadata, LogFacility logFacility, RevlogStream.Inspector chain) {
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624 metadata = _metadata;
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625 log = logFacility;
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626 delegate = chain;
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627 setCancelSupport(CancelSupport.Factory.get(chain));
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628 }
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629
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630 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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631 try {
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632 final int daLength = data.length();
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633 if (daLength < 4 || data.readByte() != 1 || data.readByte() != 10) {
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634 metadata.recordNone(revisionNumber);
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635 data.reset();
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636 } else {
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637 ArrayList<MetadataEntry> _metadata = new ArrayList<MetadataEntry>();
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638 int offset = parseMetadata(data, daLength, _metadata);
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639 metadata.add(revisionNumber, offset, _metadata);
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640 // da is in prepared state (i.e. we consumed all bytes up to metadata end).
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641 // However, it's not safe to assume delegate won't call da.reset() for some reason,
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642 // and we need to ensure predictable result.
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643 data.reset();
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644 data = new FilterDataAccess(data, offset, daLength - offset);
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645 }
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646 if (delegate != null) {
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647 delegate.next(revisionNumber, actualLen, baseRevision, linkRevision, parent1Revision, parent2Revision, nodeid, data);
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648 }
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649 } catch (IOException ex) {
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650 recordFailure(ex);
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651 } catch (HgInvalidControlFileException ex) {
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652 recordFailure(ex.isRevisionIndexSet() ? ex : ex.setRevisionIndex(revisionNumber));
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653 }
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654 }
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655
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656 private int parseMetadata(DataAccess data, final int daLength, ArrayList<MetadataEntry> _metadata) throws IOException, HgInvalidControlFileException {
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657 int lastEntryStart = 2;
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658 int lastColon = -1;
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659 // XXX in fact, need smth like ByteArrayBuilder, similar to StringBuilder,
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660 // which can't be used here because we can't convert bytes to chars as we read them
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661 // (there might be multi-byte encoding), and we need to collect all bytes before converting to string
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662 ByteArrayOutputStream bos = new ByteArrayOutputStream();
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663 String key = null, value = null;
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664 boolean byteOne = false;
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665 boolean metadataIsComplete = false;
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666 for (int i = 2; i < daLength; i++) {
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667 byte b = data.readByte();
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668 if (b == '\n') {
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669 if (byteOne) { // i.e. \n follows 1
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670 lastEntryStart = i+1;
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671 metadataIsComplete = true;
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672 // XXX is it possible to have here incomplete key/value (i.e. if last pair didn't end with \n)
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673 // if yes, need to set metadataIsComplete to true in that case as well
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674 break;
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675 }
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676 if (key == null || lastColon == -1 || i <= lastColon) {
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677 log.error(getClass(), "Missing key in file revision metadata at index %d", i);
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678 }
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diff changeset
679 value = new String(bos.toByteArray()).trim();
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680 bos.reset();
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diff changeset
681 _metadata.add(new MetadataEntry(key, value));
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682 key = value = null;
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683 lastColon = -1;
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684 lastEntryStart = i+1;
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diff changeset
685 continue;
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686 }
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687 // byteOne has to be consumed up to this line, if not yet, consume it
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688 if (byteOne) {
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689 // insert 1 we've read on previous step into the byte builder
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690 bos.write(1);
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691 byteOne = false;
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692 // fall-through to consume current byte
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693 }
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694 if (b == (int) ':') {
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695 assert value == null;
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696 key = new String(bos.toByteArray());
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697 bos.reset();
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698 lastColon = i;
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699 } else if (b == 1) {
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700 byteOne = true;
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701 } else {
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702 bos.write(b);
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703 }
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704 }
323
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705 // data.isEmpty is not reliable, renamed files of size==0 keep only metadata
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706 if (!metadataIsComplete) {
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707 // XXX perhaps, worth a testcase (empty file, renamed, read or ask ifCopy
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708 throw new HgInvalidControlFileException("Metadata is not closed properly", null, null);
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709 }
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710 return lastEntryStart;
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711 }
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712
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713 @Override
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714 public void checkFailed() throws HgException, IOException, CancelledException {
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715 super.checkFailed();
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716 if (delegate instanceof ErrorHandlingInspector) {
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717 // XXX need to add ErrorDestination and pass it around (much like CancelSupport get passed)
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718 // so that delegate would be able report its failures directly to caller without this hack
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719 ((ErrorHandlingInspector) delegate).checkFailed();
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720 }
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721 }
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722 }
2
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723 }