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annotate src/org/tmatesoft/hg/internal/RevlogStreamWriter.java @ 668:d25f0324a27a

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Delete bundle with push/pull changes once command completes successfully. Test for bundle generator
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Thu, 11 Jul 2013 18:41:40 +0200
parents ae2d439fbed3
children 545b1d4cc11d
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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19 import static org.tmatesoft.hg.internal.Internals.REVLOGV1_RECORD_SIZE;
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20 import static org.tmatesoft.hg.repo.HgRepository.BAD_REVISION;
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21 import static org.tmatesoft.hg.repo.HgRepository.NO_REVISION;
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23 import java.io.IOException;
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24 import java.nio.ByteBuffer;
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25
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26 import org.tmatesoft.hg.core.HgIOException;
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27 import org.tmatesoft.hg.core.Nodeid;
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28 import org.tmatesoft.hg.core.SessionContext;
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29 import org.tmatesoft.hg.internal.DataSerializer.ByteArrayDataSource;
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30 import org.tmatesoft.hg.internal.DataSerializer.ByteArraySerializer;
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31 import org.tmatesoft.hg.internal.DataSerializer.DataSource;
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32 import org.tmatesoft.hg.repo.HgBundle.GroupElement;
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33 import org.tmatesoft.hg.repo.HgInvalidControlFileException;
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34 import org.tmatesoft.hg.repo.HgInvalidDataFormatException;
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35 import org.tmatesoft.hg.repo.HgInvalidRevisionException;
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36 import org.tmatesoft.hg.repo.HgInvalidStateException;
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37 import org.tmatesoft.hg.repo.HgRepository;
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38 import org.tmatesoft.hg.repo.HgRuntimeException;
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39 import org.tmatesoft.hg.util.Pair;
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41 /**
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42 *
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43 * TODO [post-1.1] separate operation to check if index is too big and split into index+data
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44 *
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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 RevlogStreamWriter {
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49
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50 private final DigestHelper dh = new DigestHelper();
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51 private final RevlogCompressor revlogDataZip;
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52 private final Transaction transaction;
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53 // init with illegal values
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54 private int lastEntryBase = BAD_REVISION, lastEntryIndex = BAD_REVISION, lastEntryActualLen = -1;
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55 // record revision and its full content
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56 // the name might be misleading, it does not necessarily match lastEntryIndex
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57 private Pair<Integer, byte[]> lastFullContent;
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58 private Nodeid lastEntryRevision;
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59 private IntMap<Nodeid> revisionCache = new IntMap<Nodeid>(32);
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60 private RevlogStream revlogStream;
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61
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62 public RevlogStreamWriter(SessionContext.Source ctxSource, RevlogStream stream, Transaction tr) {
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63 assert ctxSource != null;
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64 assert stream != null;
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65 assert tr != null;
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66
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67 revlogDataZip = new RevlogCompressor(ctxSource.getSessionContext());
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68 revlogStream = stream;
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69 transaction = tr;
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70 }
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71
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72 public RevlogStream getRevlogStream() {
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73 return revlogStream;
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74 }
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75
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76 public Pair<Integer,Nodeid> addPatchRevision(GroupElement ge, RevisionToIndexMap clogRevs, RevisionToIndexMap revlogRevs) throws HgIOException, HgRuntimeException {
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77 populateLastEntryIndex();
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78 //
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79 final Nodeid nodeRev = ge.node();
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80 final Nodeid csetRev = ge.cset();
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81 int linkRev;
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82 if (nodeRev.equals(csetRev)) {
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83 linkRev = lastEntryIndex+1;
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84 } else {
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85 linkRev = clogRevs.revisionIndex(csetRev);
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86 }
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87 assert linkRev >= 0;
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88 final Nodeid p1Rev = ge.firstParent();
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89 int p1 = p1Rev.isNull() ? NO_REVISION : revlogRevs.revisionIndex(p1Rev);
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90 final Nodeid p2Rev = ge.secondParent();
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91 int p2 = p2Rev.isNull() ? NO_REVISION : revlogRevs.revisionIndex(p2Rev);
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92 Patch p = new Patch();
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93 final byte[] patchBytes;
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94 try {
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95 // XXX there's ge.rawData(), to avoid extra array wrap
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96 patchBytes = ge.rawDataByteArray();
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97 p.read(new ByteArrayDataAccess(patchBytes));
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98 } catch (IOException ex) {
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99 throw new HgIOException("Failed to read patch information", ex, null);
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100 }
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101 //
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102 final Nodeid patchBase = ge.patchBase();
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103 int patchBaseRev = patchBase.isNull() ? NO_REVISION : revlogRevs.revisionIndex(patchBase);
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104 int baseRev = lastEntryIndex == NO_REVISION ? 0 : revlogStream.baseRevision(patchBaseRev);
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105 int revLen;
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106 DataSource ds;
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107 byte[] complete = null;
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108 if (patchBaseRev == lastEntryIndex && lastEntryIndex != NO_REVISION) {
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109 // we may write patch from GroupElement as is
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110 int patchBaseLen = dataLength(patchBaseRev);
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111 revLen = patchBaseLen + p.patchSizeDelta();
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112 ds = new ByteArrayDataSource(patchBytes);
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113 } else {
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114 // read baseRev, unless it's the pull to empty repository
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115 try {
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116 if (lastEntryIndex == NO_REVISION) {
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117 complete = p.apply(new ByteArrayDataAccess(new byte[0]), -1);
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118 baseRev = 0; // it's done above, but doesn't hurt
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119 } else {
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120 assert patchBaseRev != NO_REVISION;
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121 ReadContentInspector insp = new ReadContentInspector().read(revlogStream, patchBaseRev);
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122 complete = p.apply(new ByteArrayDataAccess(insp.content), -1);
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123 baseRev = lastEntryIndex + 1;
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124 }
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125 ds = new ByteArrayDataSource(complete);
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126 revLen = complete.length;
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127 } catch (IOException ex) {
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128 // unlikely to happen, as ByteArrayDataSource throws IOException only in case of programming errors
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129 // hence, throwing rt exception here makes more sense here than HgIOException (even that latter is in throws)
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130 throw new HgInvalidDataFormatException("Failed to reconstruct revision", ex);
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131 }
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132 }
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133 doAdd(nodeRev, p1, p2, linkRev, baseRev, revLen, ds);
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134 if (complete != null) {
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135 lastFullContent = new Pair<Integer, byte[]>(lastEntryIndex, complete);
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136 }
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137 return new Pair<Integer, Nodeid>(lastEntryIndex, lastEntryRevision);
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138 }
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139
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140 /**
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141 * @return nodeid of added revision
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142 * @throws HgRuntimeException
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143 */
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144 public Pair<Integer,Nodeid> addRevision(DataSource content, int linkRevision, int p1, int p2) throws HgIOException, HgRuntimeException {
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145 populateLastEntryIndex();
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146 populateLastEntryContent();
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147 //
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148 byte[] contentByteArray = toByteArray(content);
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149 Patch patch = GeneratePatchInspector.delta(lastFullContent.second(), contentByteArray);
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150 int patchSerializedLength = patch.serializedLength();
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151
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152 final boolean writeComplete = preferCompleteOverPatch(patchSerializedLength, contentByteArray.length);
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153 DataSerializer.DataSource dataSource = writeComplete ? new ByteArrayDataSource(contentByteArray) : patch.new PatchDataSource();
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154 //
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155 Nodeid p1Rev = revision(p1);
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156 Nodeid p2Rev = revision(p2);
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157 Nodeid newRev = Nodeid.fromBinary(dh.sha1(p1Rev, p2Rev, contentByteArray).asBinary(), 0);
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158 doAdd(newRev, p1, p2, linkRevision, writeComplete ? lastEntryIndex+1 : lastEntryBase, contentByteArray.length, dataSource);
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159 lastFullContent = new Pair<Integer, byte[]>(lastEntryIndex, contentByteArray);
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160 return new Pair<Integer, Nodeid>(lastEntryIndex, lastEntryRevision);
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161 }
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162
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163 private Nodeid doAdd(Nodeid rev, int p1, int p2, int linkRevision, int baseRevision, int revLen, DataSerializer.DataSource dataSource) throws HgIOException, HgRuntimeException {
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164 assert linkRevision >= 0;
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165 assert baseRevision >= 0;
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166 assert p1 == NO_REVISION || p1 >= 0;
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167 assert p2 == NO_REVISION || p2 >= 0;
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168 assert !rev.isNull();
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169 assert revLen >= 0;
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170 revlogDataZip.reset(dataSource);
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171 final int compressedLen;
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172 final boolean useCompressedData = preferCompressedOverComplete(revlogDataZip.getCompressedLength(), dataSource.serializeLength());
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173 if (useCompressedData) {
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174 compressedLen= revlogDataZip.getCompressedLength();
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175 } else {
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176 // compression wasn't too effective,
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177 compressedLen = dataSource.serializeLength() + 1 /*1 byte for 'u' - uncompressed prefix byte*/;
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178 }
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179 //
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180 DataSerializer indexFile, dataFile;
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181 indexFile = dataFile = null;
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182 try {
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183 //
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184 indexFile = revlogStream.getIndexStreamWriter(transaction);
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185 final boolean isInlineData = revlogStream.isInlineData();
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186 HeaderWriter revlogHeader = new HeaderWriter(isInlineData);
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187 revlogHeader.length(revLen, compressedLen);
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188 revlogHeader.nodeid(rev.toByteArray());
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189 revlogHeader.linkRevision(linkRevision);
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190 revlogHeader.parents(p1, p2);
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191 revlogHeader.baseRevision(baseRevision);
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192 long lastEntryOffset = revlogStream.newEntryOffset();
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193 revlogHeader.offset(lastEntryOffset);
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194 //
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195 revlogHeader.serialize(indexFile);
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196
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197 if (isInlineData) {
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198 dataFile = indexFile;
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199 } else {
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200 dataFile = revlogStream.getDataStreamWriter(transaction);
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201 }
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202 if (useCompressedData) {
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203 int actualCompressedLenWritten = revlogDataZip.writeCompressedData(dataFile);
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204 if (actualCompressedLenWritten != compressedLen) {
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205 throw new HgInvalidStateException(String.format("Expected %d bytes of compressed data, but actually wrote %d in %s", compressedLen, actualCompressedLenWritten, revlogStream.getDataFileName()));
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206 }
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207 } else {
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208 dataFile.writeByte((byte) 'u');
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209 dataSource.serialize(dataFile);
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210 }
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211
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212 lastEntryBase = revlogHeader.baseRevision();
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213 lastEntryIndex++;
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214 lastEntryActualLen = revLen;
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215 lastEntryRevision = rev;
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216 revisionCache.put(lastEntryIndex, lastEntryRevision);
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217
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218 revlogStream.revisionAdded(lastEntryIndex, lastEntryRevision, lastEntryBase, lastEntryOffset);
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219 } finally {
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220 indexFile.done();
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221 if (dataFile != null && dataFile != indexFile) {
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222 dataFile.done();
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223 }
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224 }
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225 return lastEntryRevision;
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226 }
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227
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228 private byte[] toByteArray(DataSource content) throws HgIOException, HgRuntimeException {
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229 ByteArraySerializer ba = new ByteArraySerializer();
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230 content.serialize(ba);
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231 return ba.toByteArray();
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232 }
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233
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234 private Nodeid revision(int revisionIndex) throws HgInvalidControlFileException, HgInvalidRevisionException {
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235 if (revisionIndex == NO_REVISION) {
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236 return Nodeid.NULL;
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237 }
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238 Nodeid n = revisionCache.get(revisionIndex);
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239 if (n == null) {
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240 n = Nodeid.fromBinary(revlogStream.nodeid(revisionIndex), 0);
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241 revisionCache.put(revisionIndex, n);
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242 }
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243 return n;
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244 }
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245
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246 private int dataLength(int revisionIndex) throws HgInvalidControlFileException, HgInvalidRevisionException {
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247 assert revisionIndex >= 0;
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248 if (revisionIndex == lastEntryIndex && lastEntryActualLen >= 0) {
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249 // if the last entry is the one we've just written, we know its actual len.
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250 // it's possible, however, that revisionIndex == lastEntryIndex just
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251 // because revision being added comes right after last locally known one
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252 // and lastEntryActualLen is not set
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253 return lastEntryActualLen;
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254 }
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255 if (lastFullContent != null && lastFullContent.first() == revisionIndex) {
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256 return lastFullContent.second().length;
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257 }
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258 return revlogStream.dataLength(revisionIndex);
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259 }
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260
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261 private void populateLastEntryIndex() throws HgRuntimeException {
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262 int revCount = revlogStream.revisionCount();
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263 lastEntryIndex = revCount == 0 ? NO_REVISION : revCount - 1;
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264 }
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265
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266 private void populateLastEntryContent() throws HgIOException, HgRuntimeException {
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267 if (lastFullContent != null && lastFullContent.first() == lastEntryIndex) {
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268 // we have last entry cached
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269 return;
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270 }
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271 lastEntryRevision = Nodeid.NULL;
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272 if (lastEntryIndex != NO_REVISION) {
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273 ReadContentInspector insp = new ReadContentInspector().read(revlogStream, lastEntryIndex);
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274 lastEntryBase = insp.baseRev;
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275 lastEntryRevision = insp.rev;
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276 lastFullContent = new Pair<Integer, byte[]>(lastEntryIndex, insp.content);
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277 } else {
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278 lastFullContent = new Pair<Integer, byte[]>(lastEntryIndex, new byte[0]);
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279 }
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280 assert lastFullContent.first() == lastEntryIndex;
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281 assert lastFullContent.second() != null;
538
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282 }
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283
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284 public static boolean preferCompleteOverPatch(int patchLength, int fullContentLength) {
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285 return !decideWorthEffort(patchLength, fullContentLength);
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286 }
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287
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288 public static boolean preferCompressedOverComplete(int compressedLen, int fullContentLength) {
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289 if (compressedLen <= 0) { // just in case, meaningless otherwise
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290 return false;
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291 }
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292 return decideWorthEffort(compressedLen, fullContentLength);
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293 }
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294
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295 // true if length obtained with effort is worth it
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296 private static boolean decideWorthEffort(int lengthWithExtraEffort, int lengthWithoutEffort) {
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297 return lengthWithExtraEffort < (/* 3/4 of original */lengthWithoutEffort - (lengthWithoutEffort >>> 2));
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298 }
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299
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300 /*XXX public because HgCloneCommand uses it*/
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301 public static class HeaderWriter implements DataSerializer.DataSource {
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302 private final ByteBuffer header;
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303 private final boolean isInline;
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304 private long offset;
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305 private int length, compressedLength;
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306 private int baseRev, linkRev, p1, p2;
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307 private byte[] nodeid;
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308
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309 public HeaderWriter(boolean inline) {
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310 isInline = inline;
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311 header = ByteBuffer.allocate(REVLOGV1_RECORD_SIZE);
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312 }
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313
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314 public HeaderWriter offset(long offset) {
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315 this.offset = offset;
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316 return this;
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317 }
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318
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319 public int baseRevision() {
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320 return baseRev;
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321 }
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322
530
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323 public HeaderWriter baseRevision(int baseRevision) {
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324 this.baseRev = baseRevision;
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325 return this;
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326 }
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327
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328 public HeaderWriter length(int len, int compressedLen) {
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329 this.length = len;
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330 this.compressedLength = compressedLen;
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331 return this;
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332 }
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333
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334 public HeaderWriter parents(int parent1, int parent2) {
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335 p1 = parent1;
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336 p2 = parent2;
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337 return this;
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338 }
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339
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340 public HeaderWriter linkRevision(int linkRevision) {
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341 linkRev = linkRevision;
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342 return this;
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343 }
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344
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345 public HeaderWriter nodeid(Nodeid n) {
534
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346 nodeid = n.toByteArray();
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347 return this;
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348 }
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349
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350 public HeaderWriter nodeid(byte[] nodeidBytes) {
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351 nodeid = nodeidBytes;
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352 return this;
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353 }
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354
618
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355 public void serialize(DataSerializer out) throws HgIOException {
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356 header.clear();
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357 if (offset == 0) {
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358 int version = 1 /* RevlogNG */;
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359 if (isInline) {
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360 version |= RevlogStream.INLINEDATA;
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361 }
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362 header.putInt(version);
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363 header.putInt(0);
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364 } else {
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365 header.putLong(offset << 16);
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366 }
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367 header.putInt(compressedLength);
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368 header.putInt(length);
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369 header.putInt(baseRev);
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370 header.putInt(linkRev);
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371 header.putInt(p1);
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372 header.putInt(p2);
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373 header.put(nodeid);
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374 // assume 12 bytes left are zeros
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375 out.write(header.array(), 0, header.capacity());
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376
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377 // regardless whether it's inline or separate data,
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378 // offset field always represent cumulative compressedLength
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379 // (while physical offset in the index file with inline==true differs by n*sizeof(header), where n is entry's position in the file)
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380 offset += compressedLength;
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381 }
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382
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383 public int serializeLength() {
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384 return header.capacity();
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385 }
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386 }
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387
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388 // XXX part of HgRevisionMap contract, need public counterparts (along with IndexToRevisionMap)
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389 public interface RevisionToIndexMap {
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390
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391 /**
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392 * @return {@link HgRepository#NO_REVISION} if unknown revision
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393 */
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394 int revisionIndex(Nodeid revision);
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395 }
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396
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397 private static class ReadContentInspector implements RevlogStream.Inspector {
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398 public int baseRev;
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399 public Nodeid rev;
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400 public byte[] content;
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401 private IOException failure;
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402
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403 public ReadContentInspector read(RevlogStream rs, int revIndex) throws HgIOException, HgRuntimeException {
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404 assert revIndex >= 0;
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405 rs.iterate(revIndex, revIndex, true, this);
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406 if (failure != null) {
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407 String m = String.format("Failed to get content of revision %d", revIndex);
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408 throw rs.initWithIndexFile(new HgIOException(m, failure, null));
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409 }
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410 return this;
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411 }
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412
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413 public void next(int revisionIndex, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess data) {
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414 try {
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415 baseRev = baseRevision;
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416 rev = Nodeid.fromBinary(nodeid, 0);
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417 content = data.byteArray();
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418 } catch (IOException ex) {
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419 failure = ex;
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420 }
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421 }
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422 }
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423 }