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annotate src/org/tmatesoft/hg/internal/DirstateBuilder.java @ 617:65c01508f002

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Rollback support for commands that modify repository. Strategy to keep complete copy of a file being changed
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Wed, 15 May 2013 20:10:09 +0200
parents bd5926e24aa3
children 6526d8adbc0f
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.internal;
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18
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19 import static org.tmatesoft.hg.repo.HgRepositoryFiles.Dirstate;
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20 import static org.tmatesoft.hg.repo.HgRepositoryFiles.UndoDirstate;
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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.nio.ByteBuffer;
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26 import java.nio.channels.FileChannel;
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27 import java.nio.channels.WritableByteChannel;
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28 import java.util.Map;
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29 import java.util.TreeMap;
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30
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31 import org.tmatesoft.hg.core.HgIOException;
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32 import org.tmatesoft.hg.core.Nodeid;
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33 import org.tmatesoft.hg.repo.HgDirstate;
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34 import org.tmatesoft.hg.repo.HgDirstate.EntryKind;
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35 import org.tmatesoft.hg.repo.HgDirstate.Record;
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36 import org.tmatesoft.hg.repo.HgInvalidStateException;
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37 import org.tmatesoft.hg.repo.HgManifest.Flags;
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38 import org.tmatesoft.hg.util.Path;
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39
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40 /**
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41 * Facility to build a dirstate file as described in {@linkplain http://mercurial.selenic.com/wiki/DirState}
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42 *
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43 * @see http://mercurial.selenic.com/wiki/DirState
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44 * @see HgDirstate
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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 class DirstateBuilder {
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49 private Map<Path, HgDirstate.Record> normal = new TreeMap<Path, HgDirstate.Record>();
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50 private Map<Path, HgDirstate.Record> added = new TreeMap<Path, HgDirstate.Record>();
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51 private Map<Path, HgDirstate.Record> removed = new TreeMap<Path, HgDirstate.Record>();
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52 private Map<Path, HgDirstate.Record> merged = new TreeMap<Path, HgDirstate.Record>();
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53 private Nodeid parent1, parent2;
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54 private final Internals hgRepo;
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55 private final EncodingHelper encodingHelper;
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56
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57 public DirstateBuilder(Internals internalRepo) {
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58 hgRepo = internalRepo;
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59 encodingHelper = internalRepo.buildFileNameEncodingHelper();
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60 }
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61
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62 public void parents(Nodeid p1, Nodeid p2) {
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63 parent1 = p1 == null ? Nodeid.NULL : p1;
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64 parent2 = p2 == null ? Nodeid.NULL : p2;
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65 }
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66
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67 public void recordNormal(Path fname, int fmode, int mtime, int bytesWritten) {
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68 forget(fname);
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69 normal.put(fname, new HgDirstate.Record(fmode, bytesWritten, mtime, fname, null));
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70 }
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71
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72 public void recordUncertain(Path fname) {
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73 // `hg revert` puts "n 0 -1 unset" for the reverted file, so shall we
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74 forget(fname);
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75 normal.put(fname, new HgDirstate.Record(0, -1, -1, fname, null));
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76 }
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77
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78 public void recordAdded(Path fname, Flags flags, int size) {
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79 forget(fname);
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80 added.put(fname, new HgDirstate.Record(0, -1, -1, fname, null));
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81 }
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82
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83 public void recordRemoved(Path fname) {
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84 HgDirstate.Record r = forget(fname);
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85 HgDirstate.Record n;
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86 if (r == null) {
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87 n = new HgDirstate.Record(0, -1, -1, fname, null);
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88 } else {
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89 n = new HgDirstate.Record(r.mode(), r.size(), r.modificationTime(), fname, r.copySource());
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90 }
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91 removed.put(fname, n);
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92 }
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93
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94 private HgDirstate.Record forget(Path fname) {
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95 HgDirstate.Record r;
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96 if ((r = normal.remove(fname)) != null) {
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97 return r;
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98 }
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99 if ((r = added.remove(fname)) != null) {
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100 return r;
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101 }
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102 if ((r = removed.remove(fname)) != null) {
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103 return r;
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104 }
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105 return merged.remove(fname);
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106 }
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107
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108 public void serialize(WritableByteChannel dest) throws IOException {
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109 assert parent1 != null : "Parent(s) of the working directory shall be set first";
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110 ByteBuffer bb = ByteBuffer.allocate(256);
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111 bb.put(parent1.toByteArray());
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112 bb.put(parent2.toByteArray());
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113 bb.flip();
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114 // header
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115 int written = dest.write(bb);
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116 if (written != bb.limit()) {
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117 throw new IOException("Incomplete write");
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118 }
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119 bb.clear();
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120 // entries
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121 @SuppressWarnings("unchecked")
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122 Map<Path, HgDirstate.Record>[] all = new Map[] {normal, added, removed, merged};
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123 ByteBuffer recordTypes = ByteBuffer.allocate(4);
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124 recordTypes.put((byte) 'n').put((byte) 'a').put((byte) 'r').put((byte) 'm').flip();
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125 for (Map<Path, HgDirstate.Record> m : all) {
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126 final byte recordType = recordTypes.get();
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127 for (HgDirstate.Record r : m.values()) {
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128 // regular entry is 1+4+4+4+4+fname.length bytes
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129 // it might get extended with copy origin, prepended with 0 byte
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130 byte[] fname = encodingHelper.toDirstate(r.name());
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131 byte[] copyOrigin = r.copySource() == null ? null : encodingHelper.toDirstate(r.copySource());
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132 int length = fname.length + (copyOrigin == null ? 0 : (1 + copyOrigin.length));
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133 bb = ensureCapacity(bb, 17 + length);
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134 bb.put(recordType);
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135 bb.putInt(r.mode());
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136 bb.putInt(r.size());
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137 bb.putInt(r.modificationTime());
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138 bb.putInt(length);
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139 bb.put(fname);
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140 if (copyOrigin != null) {
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141 bb.put((byte) 0);
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142 bb.put(copyOrigin);
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143 }
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144 bb.flip();
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145 written = dest.write(bb);
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146 if (written != bb.limit()) {
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147 throw new IOException("Incomplete write");
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148 }
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149 bb.clear();
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150 }
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151 }
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152 }
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153
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154 public void serialize(Transaction tr) throws HgIOException {
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155 File dirstateFile = tr.prepare(hgRepo.getRepositoryFile(Dirstate), hgRepo.getRepositoryFile(UndoDirstate));
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156 try {
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157 FileChannel dirstate = new FileOutputStream(dirstateFile).getChannel();
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158 serialize(dirstate);
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159 dirstate.close();
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160 tr.done(dirstateFile);
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161 } catch (IOException ex) {
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162 tr.failure(dirstateFile, ex);
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163 throw new HgIOException("Can't write down new directory state", ex, dirstateFile);
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164 }
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165 }
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167 public void fillFrom(DirstateReader dirstate) {
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168 // TODO preserve order, if reasonable and possible
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169 dirstate.readInto(new HgDirstate.Inspector() {
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170
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171 public boolean next(EntryKind kind, Record entry) {
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172 switch (kind) {
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173 case Normal: normal.put(entry.name(), entry); break;
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174 case Added : added.put(entry.name(), entry); break;
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175 case Removed : removed.put(entry.name(), entry); break;
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176 case Merged : merged.put(entry.name(), entry); break;
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177 default: throw new HgInvalidStateException(String.format("Unexpected entry in the dirstate: %s", kind));
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178 }
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179 return true;
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180 }
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181 });
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182 parents(dirstate.parents().first(), dirstate.parents().second());
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183 }
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184
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185
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186 private static ByteBuffer ensureCapacity(ByteBuffer buf, int cap) {
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187 if (buf.capacity() >= cap) {
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188 return buf;
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189 }
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190 return ByteBuffer.allocate(cap);
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191 }
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192 }