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annotate src/org/tmatesoft/hg/internal/DirstateBuilder.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) 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.HgInvalidControlFileException;
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37 import org.tmatesoft.hg.repo.HgInvalidStateException;
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38 import org.tmatesoft.hg.repo.HgManifest.Flags;
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39 import org.tmatesoft.hg.util.Path;
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40
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41 /**
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42 * Facility to build a dirstate file as described in {@linkplain http://mercurial.selenic.com/wiki/DirState}
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43 *
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44 * @see http://mercurial.selenic.com/wiki/DirState
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45 * @see HgDirstate
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46 * @author Artem Tikhomirov
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47 * @author TMate Software Ltd.
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48 */
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49 public class DirstateBuilder {
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50 private Map<Path, HgDirstate.Record> normal = new TreeMap<Path, HgDirstate.Record>();
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51 private Map<Path, HgDirstate.Record> added = new TreeMap<Path, HgDirstate.Record>();
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52 private Map<Path, HgDirstate.Record> removed = new TreeMap<Path, HgDirstate.Record>();
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53 private Map<Path, HgDirstate.Record> merged = new TreeMap<Path, HgDirstate.Record>();
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54 private Nodeid parent1, parent2;
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55 private final Internals hgRepo;
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56 private final EncodingHelper encodingHelper;
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57
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58 public DirstateBuilder(Internals internalRepo) {
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59 hgRepo = internalRepo;
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60 encodingHelper = internalRepo.buildFileNameEncodingHelper();
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61 }
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62
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63 public void parents(Nodeid p1, Nodeid p2) {
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64 parent1 = p1 == null ? Nodeid.NULL : p1;
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65 parent2 = p2 == null ? Nodeid.NULL : p2;
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66 }
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67
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68 public void recordNormal(Path fname, int fmode, int mtime, int bytesWritten) {
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69 forget(fname);
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70 normal.put(fname, new HgDirstate.Record(fmode, bytesWritten, mtime, fname, null));
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71 }
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72
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73 public void recordUncertain(Path fname) {
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74 // `hg revert` puts "n 0 -1 unset" for the reverted file, so shall we
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75 forget(fname);
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76 normal.put(fname, new HgDirstate.Record(0, -1, -1, fname, null));
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77 }
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78
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79 public void recordAdded(Path fname, Flags flags, int size) {
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80 forget(fname);
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81 added.put(fname, new HgDirstate.Record(0, -1, -1, fname, null));
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82 }
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83
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84 public void recordRemoved(Path fname) {
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85 HgDirstate.Record r = forget(fname);
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86 HgDirstate.Record n;
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87 if (r == null) {
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88 n = new HgDirstate.Record(0, -1, -1, fname, null);
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89 } else {
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90 n = new HgDirstate.Record(r.mode(), r.size(), r.modificationTime(), fname, r.copySource());
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91 }
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92 removed.put(fname, n);
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93 }
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94
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95 public void recordMerged(Path fname, int fmode, int mtime, int bytesWritten) {
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96 forget(fname);
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97 merged.put(fname, new HgDirstate.Record(fmode, bytesWritten,mtime, fname, null));
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98 }
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99
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100 /**
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101 * From DirState wiki:
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102 * <p>"size is ... when the dirstate is in a merge state: -2 will *always* return dirty, it is used to mark a file that was cleanly picked from p2"
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103 * and
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104 * <p>"Additional meta status...'np2': merged from other parent (status == 'n', size == -2)"
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105 */
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106 public void recordMergedFromP2(Path fname) {
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107 forget(fname);
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108 normal.put(fname, new HgDirstate.Record(0, -2, -1, fname, null));
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109 }
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110
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111 /**
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112 * Mark file from this dirstate as merged, using all the information
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113 */
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114 public void recordMergedExisting(Path fname, Path knownInDirstate) {
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115 HgDirstate.Record r = forget(knownInDirstate);
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116 HgDirstate.Record n;
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117 if (r == null) {
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118 assert false;
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119 n = new HgDirstate.Record(0, -1, -1, fname, null);
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120 } else {
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121 n = new HgDirstate.Record(r.mode(), r.size(), r.modificationTime(), fname, r.copySource());
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122 }
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123 merged.put(fname, n);
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124 }
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125
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126
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127 private HgDirstate.Record forget(Path fname) {
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128 HgDirstate.Record r;
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129 if ((r = normal.remove(fname)) != null) {
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130 return r;
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131 }
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132 if ((r = added.remove(fname)) != null) {
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133 return r;
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134 }
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135 if ((r = removed.remove(fname)) != null) {
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136 return r;
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137 }
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138 return merged.remove(fname);
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139 }
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140
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141 public void serialize(WritableByteChannel dest) throws IOException {
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142 assert parent1 != null : "Parent(s) of the working directory shall be set first";
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143 ByteBuffer bb = ByteBuffer.allocate(256);
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144 bb.put(parent1.toByteArray());
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145 bb.put(parent2.toByteArray());
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146 bb.flip();
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147 // header
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148 int written = dest.write(bb);
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149 if (written != bb.limit()) {
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150 throw new IOException("Incomplete write");
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151 }
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152 bb.clear();
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153 // entries
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154 @SuppressWarnings("unchecked")
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155 Map<Path, HgDirstate.Record>[] all = new Map[] {normal, added, removed, merged};
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156 ByteBuffer recordTypes = ByteBuffer.allocate(4);
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157 recordTypes.put((byte) 'n').put((byte) 'a').put((byte) 'r').put((byte) 'm').flip();
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158 for (Map<Path, HgDirstate.Record> m : all) {
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159 final byte recordType = recordTypes.get();
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160 for (HgDirstate.Record r : m.values()) {
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161 // regular entry is 1+4+4+4+4+fname.length bytes
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162 // it might get extended with copy origin, prepended with 0 byte
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163 byte[] fname = encodingHelper.toDirstate(r.name());
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164 byte[] copyOrigin = r.copySource() == null ? null : encodingHelper.toDirstate(r.copySource());
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165 int length = fname.length + (copyOrigin == null ? 0 : (1 + copyOrigin.length));
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166 bb = ensureCapacity(bb, 17 + length);
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167 bb.put(recordType);
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168 bb.putInt(r.mode());
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169 bb.putInt(r.size());
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170 bb.putInt(r.modificationTime());
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171 bb.putInt(length);
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172 bb.put(fname);
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173 if (copyOrigin != null) {
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174 bb.put((byte) 0);
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175 bb.put(copyOrigin);
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176 }
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177 bb.flip();
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178 written = dest.write(bb);
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179 if (written != bb.limit()) {
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180 throw new IOException("Incomplete write");
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181 }
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182 bb.clear();
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183 }
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184 }
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185 }
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186
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187 public void serialize(Transaction tr) throws HgIOException {
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188 File dirstateFile = tr.prepare(hgRepo.getRepositoryFile(Dirstate), hgRepo.getRepositoryFile(UndoDirstate));
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189 try {
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190 FileChannel dirstate = new FileOutputStream(dirstateFile).getChannel();
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191 serialize(dirstate);
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192 dirstate.close();
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193 tr.done(dirstateFile);
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194 } catch (IOException ex) {
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195 tr.failure(dirstateFile, ex);
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196 throw new HgIOException("Can't write down new directory state", ex, dirstateFile);
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197 }
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198 }
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199
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200 public void fillFrom(DirstateReader dirstate) throws HgInvalidControlFileException {
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201 // TODO preserve order, if reasonable and possible
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202 dirstate.readInto(new HgDirstate.Inspector() {
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203
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204 public boolean next(EntryKind kind, Record entry) {
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205 switch (kind) {
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206 case Normal: normal.put(entry.name(), entry); break;
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207 case Added : added.put(entry.name(), entry); break;
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208 case Removed : removed.put(entry.name(), entry); break;
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209 case Merged : merged.put(entry.name(), entry); break;
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210 default: throw new HgInvalidStateException(String.format("Unexpected entry in the dirstate: %s", kind));
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211 }
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212 return true;
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213 }
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214 });
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215 parents(dirstate.parents().first(), dirstate.parents().second());
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216 }
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217
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218
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219 private static ByteBuffer ensureCapacity(ByteBuffer buf, int cap) {
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220 if (buf.capacity() >= cap) {
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221 return buf;
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222 }
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223 return ByteBuffer.allocate(cap);
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224 }
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225 }