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annotate src/org/tmatesoft/hg/internal/MergeStateBuilder.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 42b88709e41d
children
rev   line source
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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 }
705
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180 }
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181 }