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annotate src/org/tmatesoft/hg/internal/DirstateReader.java @ 678:8625cba0a5a8

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Towards better blame of merge revisions: refactor merge handling strategy
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Fri, 19 Jul 2013 15:36:29 +0200
parents 5c68567b3645
children
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1 /*
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2 * Copyright (c) 2010-2013 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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a3a2e5deb320 Updated contact address to support@hg4j.com
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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.internal;
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18
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19 import static org.tmatesoft.hg.core.Nodeid.NULL;
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20 import static org.tmatesoft.hg.repo.HgRepositoryFiles.Branch;
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21 import static org.tmatesoft.hg.repo.HgRepositoryFiles.Dirstate;
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22 import static org.tmatesoft.hg.util.LogFacility.Severity.Debug;
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23
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24 import java.io.BufferedReader;
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25 import java.io.File;
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26 import java.io.FileInputStream;
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27 import java.io.FileNotFoundException;
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28 import java.io.IOException;
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29 import java.io.InputStreamReader;
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30
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31 import org.tmatesoft.hg.core.Nodeid;
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32 import org.tmatesoft.hg.repo.HgDirstate;
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33 import org.tmatesoft.hg.repo.HgDirstate.EntryKind;
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34 import org.tmatesoft.hg.repo.HgInvalidControlFileException;
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35 import org.tmatesoft.hg.repo.HgRepository;
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36 import org.tmatesoft.hg.util.LogFacility.Severity;
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37 import org.tmatesoft.hg.util.Pair;
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38 import org.tmatesoft.hg.util.Path;
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39
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41 /**
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42 * Parse dirstate file
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43 *
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44 * @see http://mercurial.selenic.com/wiki/DirState
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45 * @see http://mercurial.selenic.com/wiki/FileFormats#dirstate
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46 *
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47 * @author Artem Tikhomirov
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48 * @author TMate Software Ltd.
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49 */
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50 public final class DirstateReader {
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51 // dirstate read code originally lived in org.tmatesoft.hg.repo.HgDirstate
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52
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53 private final Internals repo;
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54 private final Path.Source pathPool;
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55 private Pair<Nodeid, Nodeid> parents;
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57 public DirstateReader(Internals hgRepo, Path.Source pathSource) {
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58 repo = hgRepo;
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59 pathPool = pathSource;
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60 }
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62 public void readInto(HgDirstate.Inspector target) throws HgInvalidControlFileException {
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63 EncodingHelper encodingHelper = repo.buildFileNameEncodingHelper();
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64 parents = new Pair<Nodeid,Nodeid>(Nodeid.NULL, Nodeid.NULL);
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65 File dirstateFile = getDirstateFile(repo);
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66 if (dirstateFile == null || !dirstateFile.exists()) {
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67 return;
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68 }
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69 DataAccess da = repo.getDataAccess().createReader(dirstateFile, false);
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70 try {
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71 if (da.isEmpty()) {
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72 return;
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73 }
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74 parents = internalReadParents(da);
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75 // hg init; hg up produces an empty repository where dirstate has parents (40 bytes) only
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76 while (!da.isEmpty()) {
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77 final byte state = da.readByte();
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78 final int fmode = da.readInt();
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79 final int size = da.readInt();
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80 final int time = da.readInt();
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81 final int nameLen = da.readInt();
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82 String fn1 = null, fn2 = null;
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83 byte[] name = new byte[nameLen];
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84 da.readBytes(name, 0, nameLen);
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85 for (int i = 0; i < nameLen; i++) {
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86 if (name[i] == 0) {
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87 fn1 = encodingHelper.fromDirstate(name, 0, i);
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88 fn2 = encodingHelper.fromDirstate(name, i+1, nameLen - i - 1);
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89 break;
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90 }
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91 }
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92 if (fn1 == null) {
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93 fn1 = encodingHelper.fromDirstate(name, 0, nameLen);
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94 }
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95 HgDirstate.Record r = new HgDirstate.Record(fmode, size, time, pathPool.path(fn1), fn2 == null ? null : pathPool.path(fn2));
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96 if (state == 'n') {
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97 target.next(EntryKind.Normal, r);
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98 } else if (state == 'a') {
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99 target.next(EntryKind.Added, r);
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100 } else if (state == 'r') {
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101 target.next(EntryKind.Removed, r);
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102 } else if (state == 'm') {
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103 target.next(EntryKind.Merged, r);
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104 } else {
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105 repo.getLog().dump(getClass(), Severity.Warn, "Dirstate record for file %s (size: %d, tstamp:%d) has unknown state '%c'", r.name(), r.size(), r.modificationTime(), state);
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106 }
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107 }
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108 } catch (IOException ex) {
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109 throw new HgInvalidControlFileException("Dirstate read failed", ex, dirstateFile);
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110 } finally {
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111 da.done();
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112 }
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113 }
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114
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115 private static Pair<Nodeid, Nodeid> internalReadParents(DataAccess da) throws IOException {
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116 byte[] parents = new byte[40];
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117 da.readBytes(parents, 0, 40);
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118 Nodeid n1 = Nodeid.fromBinary(parents, 0);
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119 Nodeid n2 = Nodeid.fromBinary(parents, 20);
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120 parents = null;
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121 return new Pair<Nodeid, Nodeid>(n1, n2);
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122 }
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123
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124 /**
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125 * @return pair of working copy parents, with {@link Nodeid#NULL} for missing values.
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126 */
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127 public Pair<Nodeid,Nodeid> parents() {
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128 assert parents != null; // instance not initialized with #read()
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129 return parents;
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130 }
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131
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132 private static File getDirstateFile(Internals repo) {
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133 return repo.getFileFromRepoDir(Dirstate.getName());
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134 }
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135
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136 /**
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137 * @return pair of parents, both {@link Nodeid#NULL} if dirstate is not available
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138 */
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139 public static Pair<Nodeid, Nodeid> readParents(Internals internalRepo) throws HgInvalidControlFileException {
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140 // do not read whole dirstate if all we need is WC parent information
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141 File dirstateFile = getDirstateFile(internalRepo);
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142 if (dirstateFile == null || !dirstateFile.exists()) {
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143 return new Pair<Nodeid,Nodeid>(NULL, NULL);
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144 }
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145 DataAccess da = internalRepo.getDataAccess().createReader(dirstateFile, false);
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146 try {
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147 if (da.isEmpty()) {
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148 return new Pair<Nodeid,Nodeid>(NULL, NULL);
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149 }
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150 return internalReadParents(da);
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151 } catch (IOException ex) {
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152 throw new HgInvalidControlFileException("Error reading working copy parents from dirstate", ex, dirstateFile);
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153 } finally {
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154 da.done();
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155 }
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156 }
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157
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158 /**
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159 * TODO [post-1.0] it's really not a proper place for the method, need WorkingCopyContainer or similar
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160 * @return branch associated with the working directory
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161 */
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162 public static String readBranch(Internals internalRepo) throws HgInvalidControlFileException {
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163 File branchFile = internalRepo.getRepositoryFile(Branch);
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164 String branch = HgRepository.DEFAULT_BRANCH_NAME;
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165 if (branchFile.exists()) {
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166 try {
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167 // branch file is UTF-8 encoded, see http://mercurial.selenic.com/wiki/EncodingStrategy#UTF-8_strings
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168 // shall not use system-default encoding (FileReader) when reading it!
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169 // Perhaps, shall use EncodingHelper.fromBranch and InputStream instead, for uniformity?
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170 // Since whole file is in UTF8, InputStreamReader is a convenience over InputStream,
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171 // which we use elsewhere (together with EncodingHelper) - other files are usually a mix of binary data
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172 // and encoded text (hence, InputStreamReader with charset is not an option there)
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173 BufferedReader r = new BufferedReader(new InputStreamReader(new FileInputStream(branchFile), EncodingHelper.getUTF8()));
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174 String b = r.readLine();
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175 if (b != null) {
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176 b = b.trim().intern();
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177 }
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178 branch = b == null || b.length() == 0 ? HgRepository.DEFAULT_BRANCH_NAME : b;
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179 r.close();
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180 } catch (FileNotFoundException ex) {
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181 internalRepo.getLog().dump(HgDirstate.class, Debug, ex, null); // log verbose debug, exception might be legal here
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182 // IGNORE
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183 } catch (IOException ex) {
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184 throw new HgInvalidControlFileException("Error reading file with branch information", ex, branchFile);
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185 }
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186 }
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187 return branch;
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188 }
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189 }