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annotate src/org/tmatesoft/hg/internal/MergeStateBuilder.java @ 710:cf200271439a

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author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Mon, 07 Oct 2013 01:56:05 +0200
parents 42b88709e41d
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1 /*
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2 * Copyright (c) 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 java.io.File;
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20 import java.io.FileOutputStream;
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21 import java.io.IOException;
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22 import java.io.OutputStream;
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23 import java.nio.ByteBuffer;
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24 import java.util.ArrayList;
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25 import java.util.List;
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26
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27 import org.tmatesoft.hg.core.HgFileRevision;
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28 import org.tmatesoft.hg.core.HgIOException;
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29 import org.tmatesoft.hg.core.Nodeid;
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30 import org.tmatesoft.hg.repo.HgManifest;
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31 import org.tmatesoft.hg.repo.HgMergeState;
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32 import org.tmatesoft.hg.repo.HgRepositoryFiles;
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33 import org.tmatesoft.hg.util.ByteChannel;
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34 import org.tmatesoft.hg.util.CancelledException;
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35 import org.tmatesoft.hg.util.Path;
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36 import org.tmatesoft.hg.util.LogFacility.Severity;
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37
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38 /**
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39 * Constructs merge/state file
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40 *
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41 * @see HgMergeState
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42 * @author Artem Tikhomirov
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43 * @author TMate Software Ltd.
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44 */
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45 public class MergeStateBuilder {
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46
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47 private final Internals repo;
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48 private final List<Record> unresolved = new ArrayList<Record>();
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49 private Nodeid stateParent = Nodeid.NULL;
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50
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51 public MergeStateBuilder(Internals implRepo) {
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52 repo = implRepo;
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53 }
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54
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55 public void prepare(Nodeid nodeid) {
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56 assert nodeid != null;
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57 unresolved.clear();
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58 stateParent = nodeid;
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59 abandon();
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60 }
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61
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62 public void resolved() {
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63 throw Internals.notImplemented();
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64 }
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65
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66 public void unresolved(Path file, HgFileRevision first, HgFileRevision second, HgFileRevision base, HgManifest.Flags flags) throws HgIOException {
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67 Record r = new Record(file, first.getPath(), second.getPath(), base.getPath(), base.getRevision(), flags);
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68 final File d = mergeStateDir();
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69 d.mkdirs();
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70 File f = new File(d, r.hash());
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71 try {
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72 FileOutputStream fos = new FileOutputStream(f);
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73 first.putContentTo(new OutputStreamSink(fos));
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74 fos.flush();
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75 fos.close();
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76 unresolved.add(r);
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77 } catch (IOException ex) {
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78 throw new HgIOException(String.format("Failed to write content of unresolved file %s to merge state at %s", file, f), f);
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79 } catch (CancelledException ex) {
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80 repo.getLog().dump(getClass(), Severity.Error, ex, "Our impl doesn't throw cancellation");
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81 }
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82 }
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83
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84 // merge/state serialization is not a part of a transaction
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85 public void serialize() throws HgIOException {
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86 if (unresolved.isEmpty()) {
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87 return;
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88 }
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89 File mergeStateFile = repo.getRepositoryFile(HgRepositoryFiles.MergeState);
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90 try {
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91 final byte NL = '\n';
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92 FileOutputStream fos = new FileOutputStream(mergeStateFile);
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93 fos.write(stateParent.toString().getBytes());
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94 fos.write(NL);
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95 for(Record r : unresolved) {
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96 fos.write(r.key.toString().getBytes());
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97 fos.write(0);
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98 fos.write('u');
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99 fos.write(0);
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100 fos.write(r.hash().toString().getBytes());
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101 fos.write(0);
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102 fos.write(r.fnameA.toString().getBytes());
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103 fos.write(0);
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104 fos.write(r.fnameAncestor.toString().getBytes());
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105 fos.write(0);
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106 fos.write(r.ancestorRev.toString().getBytes());
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107 fos.write(0);
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108 fos.write(r.fnameB.toString().getBytes());
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109 fos.write(0);
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110 fos.write(r.flags.mercurialString().getBytes());
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111 fos.write(NL);
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112 }
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113 fos.flush();
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114 fos.close();
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115 } catch (IOException ex) {
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116 throw new HgIOException("Failed to serialize merge state", mergeStateFile);
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117 }
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118 }
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119
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120 public void abandon() {
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121 File mergeStateDir = mergeStateDir();
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122 try {
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123 FileUtils.rmdir(mergeStateDir);
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124 } catch (IOException ex) {
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125 // ignore almost silently
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126 repo.getLog().dump(getClass(), Severity.Warn, ex, String.format("Failed to delete merge state in %s", mergeStateDir));
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127 }
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128 }
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129
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130 private File mergeStateDir() {
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131 return repo.getRepositoryFile(HgRepositoryFiles.MergeState).getParentFile();
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132 }
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133
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134 private static class Record {
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135 public final Path key;
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136 public final Path fnameA, fnameB, fnameAncestor;
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137 public final Nodeid ancestorRev;
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138 public final HgManifest.Flags flags;
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139 private String hash;
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140
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141 public Record(Path fname, Path a, Path b, Path ancestor, Nodeid rev, HgManifest.Flags f) {
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142 key = fname;
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143 fnameA = a;
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144 fnameB = b;
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145 fnameAncestor = ancestor;
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146 ancestorRev = rev;
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147 flags = f;
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148 }
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149
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150 public String hash() {
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151 if (hash == null) {
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152 hash = new DigestHelper().sha1(key).asHexString();
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153 }
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154 return hash;
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155 }
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156 }
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157
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158 private static class OutputStreamSink implements ByteChannel {
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159 private final OutputStream out;
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160
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161 public OutputStreamSink(OutputStream outputStream) {
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162 out = outputStream;
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163 }
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164
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165 public int write(ByteBuffer buffer) throws IOException {
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166 final int toWrite = buffer.remaining();
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167 if (toWrite <= 0) {
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168 return 0;
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169 }
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170 if (buffer.hasArray()) {
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171 out.write(buffer.array(), buffer.arrayOffset(), toWrite);
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172 } else {
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173 while (buffer.hasRemaining()) {
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174 out.write(buffer.get());
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175 }
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176 }
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177 buffer.position(buffer.limit());
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178 return toWrite;
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179 }
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180 }
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181 }