Mercurial > hg4j

annotate src/org/tmatesoft/hg/internal/DirstateReader.java @ 709:497e697636fc

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Report merged lines as changed block if possible, not as a sequence of added/deleted blocks. To facilitate access to merge parent lines AddBlock got mergeLineAt() method that reports index of the line in the second parent (if any), while insertedAt() has been changed to report index in the first parent always
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Wed, 21 Aug 2013 16:23:27 +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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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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56
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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 }