annotate src/org/tmatesoft/hg/internal/DirstateBuilder.java @ 711:a62079bc422b

Keyword filtering that doesn't depend on input buffer size and the way input lines got split between filter() calls. KewordFilter got state to keep processed suspicious ...$ lines
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Fri, 11 Oct 2013 21:35:41 +0200
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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 }