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annotate src/org/tmatesoft/hg/internal/DirstateReader.java @ 526:2f9ed6bcefa2

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Initial support for Revert command with accompanying minor refactoring
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 15 Jan 2013 17:07:19 +0100
parents src/org/tmatesoft/hg/repo/HgDirstate.java@0be5be8d57e9
children 47b7bedf0569
rev   line source
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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.Dirstate;
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21 import static org.tmatesoft.hg.util.LogFacility.Severity.Debug;
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22
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23 import java.io.BufferedReader;
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24 import java.io.File;
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25 import java.io.FileNotFoundException;
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26 import java.io.FileReader;
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27 import java.io.IOException;
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29 import org.tmatesoft.hg.core.Nodeid;
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30 import org.tmatesoft.hg.repo.HgDirstate;
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31 import org.tmatesoft.hg.repo.HgDirstate.EntryKind;
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32 import org.tmatesoft.hg.repo.HgInvalidControlFileException;
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33 import org.tmatesoft.hg.repo.HgRepository;
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34 import org.tmatesoft.hg.util.LogFacility.Severity;
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35 import org.tmatesoft.hg.util.Pair;
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36 import org.tmatesoft.hg.util.Path;
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37
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39 /**
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40 * Parse dirstate file
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41 *
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42 * @see http://mercurial.selenic.com/wiki/DirState
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43 * @see http://mercurial.selenic.com/wiki/FileFormats#dirstate
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44 *
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45 * @author Artem Tikhomirov
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46 * @author TMate Software Ltd.
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47 */
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48 public final class DirstateReader {
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49 // dirstate read code originally lived in org.tmatesoft.hg.repo.HgDirstate
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50
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51 private final Internals repo;
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52 private final Path.Source pathPool;
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53 private Pair<Nodeid, Nodeid> parents;
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54
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55 public DirstateReader(Internals hgRepo, Path.Source pathSource) {
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56 repo = hgRepo;
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57 pathPool = pathSource;
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58 }
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60 public void readInto(HgDirstate.Inspector target) throws HgInvalidControlFileException {
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61 EncodingHelper encodingHelper = repo.buildFileNameEncodingHelper();
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62 parents = new Pair<Nodeid,Nodeid>(Nodeid.NULL, Nodeid.NULL);
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63 File dirstateFile = getDirstateFile(repo);
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64 if (dirstateFile == null || !dirstateFile.exists()) {
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65 return;
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66 }
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67 DataAccess da = repo.getDataAccess().create(dirstateFile);
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68 try {
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69 if (da.isEmpty()) {
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70 return;
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71 }
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72 parents = internalReadParents(da);
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73 // hg init; hg up produces an empty repository where dirstate has parents (40 bytes) only
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74 while (!da.isEmpty()) {
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75 final byte state = da.readByte();
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76 final int fmode = da.readInt();
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77 final int size = da.readInt();
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78 final int time = da.readInt();
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79 final int nameLen = da.readInt();
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80 String fn1 = null, fn2 = null;
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81 byte[] name = new byte[nameLen];
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82 da.readBytes(name, 0, nameLen);
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83 for (int i = 0; i < nameLen; i++) {
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84 if (name[i] == 0) {
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85 fn1 = encodingHelper.fromDirstate(name, 0, i);
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86 fn2 = encodingHelper.fromDirstate(name, i+1, nameLen - i - 1);
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87 break;
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88 }
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89 }
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90 if (fn1 == null) {
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91 fn1 = encodingHelper.fromDirstate(name, 0, nameLen);
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92 }
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93 HgDirstate.Record r = new HgDirstate.Record(fmode, size, time, pathPool.path(fn1), fn2 == null ? null : pathPool.path(fn2));
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94 if (state == 'n') {
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95 target.next(EntryKind.Normal, r);
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96 } else if (state == 'a') {
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97 target.next(EntryKind.Added, r);
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98 } else if (state == 'r') {
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99 target.next(EntryKind.Removed, r);
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100 } else if (state == 'm') {
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101 target.next(EntryKind.Merged, r);
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102 } else {
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103 repo.getSessionContext().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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104 }
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105 }
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106 } catch (IOException ex) {
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107 throw new HgInvalidControlFileException("Dirstate read failed", ex, dirstateFile);
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108 } finally {
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109 da.done();
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110 }
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111 }
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112
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113 private static Pair<Nodeid, Nodeid> internalReadParents(DataAccess da) throws IOException {
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114 byte[] parents = new byte[40];
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115 da.readBytes(parents, 0, 40);
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116 Nodeid n1 = Nodeid.fromBinary(parents, 0);
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117 Nodeid n2 = Nodeid.fromBinary(parents, 20);
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118 parents = null;
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119 return new Pair<Nodeid, Nodeid>(n1, n2);
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120 }
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121
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122 /**
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123 * @return pair of working copy parents, with {@link Nodeid#NULL} for missing values.
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124 */
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125 public Pair<Nodeid,Nodeid> parents() {
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126 assert parents != null; // instance not initialized with #read()
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127 return parents;
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128 }
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129
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130 private static File getDirstateFile(Internals repo) {
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131 return repo.getFileFromRepoDir(Dirstate.getName());
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132 }
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133
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134 /**
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135 * @return pair of parents, both {@link Nodeid#NULL} if dirstate is not available
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136 */
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137 public static Pair<Nodeid, Nodeid> readParents(Internals internalRepo) throws HgInvalidControlFileException {
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138 // do not read whole dirstate if all we need is WC parent information
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139 File dirstateFile = getDirstateFile(internalRepo);
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140 if (dirstateFile == null || !dirstateFile.exists()) {
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141 return new Pair<Nodeid,Nodeid>(NULL, NULL);
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142 }
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143 DataAccess da = internalRepo.getDataAccess().create(dirstateFile);
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144 try {
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145 if (da.isEmpty()) {
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146 return new Pair<Nodeid,Nodeid>(NULL, NULL);
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147 }
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148 return internalReadParents(da);
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149 } catch (IOException ex) {
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150 throw new HgInvalidControlFileException("Error reading working copy parents from dirstate", ex, dirstateFile);
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151 } finally {
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152 da.done();
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153 }
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154 }
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155
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156 /**
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157 * TODO [post-1.0] it's really not a proper place for the method, need WorkingCopyContainer or similar
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158 * @return branch associated with the working directory
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159 */
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160 public static String readBranch(Internals internalRepo) throws HgInvalidControlFileException {
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161 File branchFile = internalRepo.getFileFromRepoDir("branch"); // FIXME constant in the HgRepositoryFiles
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162 String branch = HgRepository.DEFAULT_BRANCH_NAME;
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163 if (branchFile.exists()) {
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164 try {
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165 BufferedReader r = new BufferedReader(new FileReader(branchFile));
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166 String b = r.readLine();
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167 if (b != null) {
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168 b = b.trim().intern();
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169 }
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170 branch = b == null || b.length() == 0 ? HgRepository.DEFAULT_BRANCH_NAME : b;
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171 r.close();
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172 } catch (FileNotFoundException ex) {
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173 internalRepo.getSessionContext().getLog().dump(HgDirstate.class, Debug, ex, null); // log verbose debug, exception might be legal here
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174 // IGNORE
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175 } catch (IOException ex) {
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176 throw new HgInvalidControlFileException("Error reading file with branch information", ex, branchFile);
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177 }
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178 }
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179 return branch;
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180 }
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181 }