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annotate src/org/tmatesoft/hg/core/HgCheckoutCommand.java @ 542:a71a05ec11bc

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Towards annotate/blame support: general outline of the functionality
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Thu, 14 Feb 2013 16:36:13 +0100
parents 47b7bedf0569
children ca56a36c2eea
rev   line source
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1 /*
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2 * Copyright (c) 2012-2013 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.core;
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18
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19 import static org.tmatesoft.hg.repo.HgRepositoryFiles.Branch;
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20 import static org.tmatesoft.hg.repo.HgRepositoryFiles.Dirstate;
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21
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22 import java.io.File;
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23 import java.io.FileOutputStream;
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24 import java.io.IOException;
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25 import java.io.OutputStreamWriter;
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26 import java.nio.channels.FileChannel;
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27
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28 import org.tmatesoft.hg.internal.DirstateBuilder;
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29 import org.tmatesoft.hg.internal.EncodingHelper;
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30 import org.tmatesoft.hg.internal.Experimental;
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31 import org.tmatesoft.hg.internal.Internals;
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32 import org.tmatesoft.hg.internal.WorkingDirFileWriter;
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33 import org.tmatesoft.hg.repo.HgDataFile;
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34 import org.tmatesoft.hg.repo.HgInvalidRevisionException;
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35 import org.tmatesoft.hg.repo.HgManifest;
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36 import org.tmatesoft.hg.repo.HgManifest.Flags;
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37 import org.tmatesoft.hg.repo.HgRepository;
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38 import org.tmatesoft.hg.repo.HgRuntimeException;
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39 import org.tmatesoft.hg.util.CancelledException;
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40 import org.tmatesoft.hg.util.Path;
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41
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42 /**
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43 * WORK IN PROGRESS.
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44 *
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45 * Update working directory to specific state, 'hg checkout' counterpart.
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46 * For the time being, only 'clean' checkout is supported ('hg co --clean')
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47 *
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48 * @since 1.1
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49 * @author Artem Tikhomirov
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50 * @author TMate Software Ltd.
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51 */
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52 @Experimental(reason="Work in progress")
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53 public class HgCheckoutCommand extends HgAbstractCommand<HgCheckoutCommand>{
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54
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55 private final HgRepository repo;
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56 private int revisionToCheckout = HgRepository.BAD_REVISION;
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57
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58 public HgCheckoutCommand(HgRepository hgRepo) {
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59 repo = hgRepo;
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60 }
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61
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62 /**
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63 * Select revision to check out
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64 *
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65 * @param nodeid revision
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66 * @return <code>this</code> for convenience
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67 * @throws HgBadArgumentException if failed to find supplied changeset
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68 */
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69 public HgCheckoutCommand changeset(Nodeid nodeid) throws HgBadArgumentException {
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70 try {
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71 return changeset(repo.getChangelog().getRevisionIndex(nodeid));
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72 } catch (HgInvalidRevisionException ex) {
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73 throw new HgBadArgumentException("Can't find revision", ex).setRevision(nodeid);
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74 }
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75 }
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76
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77 /**
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78 * Select revision to check out using local revision index
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79 *
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80 * @param changesetIndex local revision index
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81 * @return <code>this</code> for convenience
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82 * @throws HgBadArgumentException if failed to find supplied changeset
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83 */
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84 public HgCheckoutCommand changeset(int changesetIndex) throws HgBadArgumentException {
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85 int lastCsetIndex = repo.getChangelog().getLastRevision();
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86 if (changesetIndex < 0 || changesetIndex > lastCsetIndex) {
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87 throw new HgBadArgumentException(String.format("Bad revision index %d, value from [0..%d] expected", changesetIndex, lastCsetIndex), null).setRevisionIndex(changesetIndex);
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88 }
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89 revisionToCheckout = changesetIndex;
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90 return this;
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91 }
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92
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93 /**
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94 *
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95 * @throws HgIOException to indicate troubles updating files in working copy
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96 * @throws HgException
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97 * @throws CancelledException
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98 */
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99 public void execute() throws HgException, CancelledException {
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100 try {
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101 Internals internalRepo = Internals.getInstance(repo);
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102 // FIXME remove tracked files from wd (perhaps, just forget 'Added'?)
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103 // TODO
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104 final DirstateBuilder dirstateBuilder = new DirstateBuilder(internalRepo);
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105 final CheckoutWorker worker = new CheckoutWorker(internalRepo);
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106 HgManifest.Inspector insp = new HgManifest.Inspector() {
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107
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108 public boolean next(Nodeid nid, Path fname, Flags flags) {
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109 if (worker.next(nid, fname, flags)) {
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110 // new dirstate based on manifest
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111 dirstateBuilder.recordNormal(fname, flags, worker.getLastWrittenFileSize());
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112 return true;
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113 }
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114 return false;
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115 }
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116
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117 public boolean end(int manifestRevision) {
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118 return false;
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119 }
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120
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121 public boolean begin(int mainfestRevision, Nodeid nid, int changelogRevision) {
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122 return true;
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123 }
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124 };
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125 dirstateBuilder.parents(repo.getChangelog().getRevision(revisionToCheckout), null);
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126 repo.getManifest().walk(revisionToCheckout, revisionToCheckout, insp);
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127 worker.checkFailed();
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128 File dirstateFile = internalRepo.getRepositoryFile(Dirstate);
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129 try {
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130 FileChannel dirstate = new FileOutputStream(dirstateFile).getChannel();
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131 dirstateBuilder.serialize(dirstate);
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132 dirstate.close();
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133 } catch (IOException ex) {
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134 throw new HgIOException("Can't write down new directory state", ex, dirstateFile);
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135 }
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136 String branchName = repo.getChangelog().range(revisionToCheckout, revisionToCheckout).get(0).branch();
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137 assert branchName != null;
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138 if (!HgRepository.DEFAULT_BRANCH_NAME.equals(branchName)) {
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139 File branchFile = internalRepo.getRepositoryFile(Branch);
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140 try {
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141 // branch file is UTF-8, see http://mercurial.selenic.com/wiki/EncodingStrategy#UTF-8_strings
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142 OutputStreamWriter ow = new OutputStreamWriter(new FileOutputStream(branchFile), EncodingHelper.getUTF8());
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143 ow.write(branchName);
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144 ow.close();
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145 } catch (IOException ex) {
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146 throw new HgIOException("Can't write down branch information", ex, branchFile);
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147 }
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148 }
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149 } catch (HgRuntimeException ex) {
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150 throw new HgLibraryFailureException(ex);
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151 }
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152 }
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153
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154 static class CheckoutWorker {
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155 private final Internals hgRepo;
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156 private HgException failure;
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157 private int lastWrittenFileSize;
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158
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159 CheckoutWorker(Internals implRepo) {
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160 hgRepo = implRepo;
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161 }
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162
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163 public boolean next(Nodeid nid, Path fname, Flags flags) {
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164 try {
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165 HgDataFile df = hgRepo.getRepo().getFileNode(fname);
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166 int fileRevIndex = df.getRevisionIndex(nid);
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167 // check out files based on manifest
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168 // FIXME links!
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169 WorkingDirFileWriter workingDirWriter = new WorkingDirFileWriter(hgRepo);
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170 workingDirWriter.processFile(df, fileRevIndex);
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171 lastWrittenFileSize = workingDirWriter.bytesWritten();
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172 return true;
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173 } catch (IOException ex) {
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174 failure = new HgIOException("Failed to write down file revision", ex, /*FIXME file*/null);
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175 } catch (HgRuntimeException ex) {
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176 failure = new HgLibraryFailureException(ex);
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177 }
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178 return false;
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179 }
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180
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181 public int getLastWrittenFileSize() {
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182 return lastWrittenFileSize;
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183 }
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184
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185 public void checkFailed() throws HgException {
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186 if (failure != null) {
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187 throw failure;
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188 }
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189 }
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190 };
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191 }