Mercurial > jhg
annotate src/org/tmatesoft/hg/repo/Revlog.java @ 406:d56ea1a2537a
Less meaningless package descriptions
author | Artem Tikhomirov <tikhomirov.artem@gmail.com> |
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date | Thu, 15 Mar 2012 16:51:46 +0100 |
parents | 866fc3b597a0 |
children | d30083c80d52 |
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1 /* |
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2 * Copyright (c) 2010-2012 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.repo; |
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18 |
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19 import static org.tmatesoft.hg.repo.HgRepository.BAD_REVISION; |
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20 import static org.tmatesoft.hg.repo.HgRepository.NO_REVISION; |
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21 import static org.tmatesoft.hg.repo.HgRepository.TIP; |
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22 |
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23 import java.io.IOException; |
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24 import java.nio.ByteBuffer; |
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25 import java.util.ArrayList; |
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26 import java.util.Arrays; |
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27 import java.util.Collection; |
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28 import java.util.HashSet; |
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29 import java.util.LinkedList; |
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30 import java.util.List; |
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31 |
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32 import org.tmatesoft.hg.core.HgBadStateException; |
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33 import org.tmatesoft.hg.core.HgException; |
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34 import org.tmatesoft.hg.core.HgInvalidControlFileException; |
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35 import org.tmatesoft.hg.core.HgInvalidRevisionException; |
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36 import org.tmatesoft.hg.core.Nodeid; |
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37 import org.tmatesoft.hg.internal.ArrayHelper; |
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38 import org.tmatesoft.hg.internal.DataAccess; |
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39 import org.tmatesoft.hg.internal.Experimental; |
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40 import org.tmatesoft.hg.internal.Preview; |
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41 import org.tmatesoft.hg.internal.RevlogStream; |
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42 import org.tmatesoft.hg.util.Adaptable; |
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43 import org.tmatesoft.hg.util.ByteChannel; |
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44 import org.tmatesoft.hg.util.CancelSupport; |
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45 import org.tmatesoft.hg.util.CancelledException; |
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46 import org.tmatesoft.hg.util.LogFacility; |
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47 import org.tmatesoft.hg.util.ProgressSupport; |
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48 |
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49 |
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50 /** |
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51 * Base class for all Mercurial entities that are serialized in a so called revlog format (changelog, manifest, data files). |
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52 * |
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53 * Implementation note: |
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54 * Hides actual actual revlog stream implementation and its access methods (i.e. RevlogStream.Inspector), iow shall not expose anything internal |
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55 * in public methods. |
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56 * |
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57 * @author Artem Tikhomirov |
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58 * @author TMate Software Ltd. |
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59 */ |
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60 abstract class Revlog { |
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61 |
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62 private final HgRepository repo; |
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63 protected final RevlogStream content; |
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64 |
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65 protected Revlog(HgRepository hgRepo, RevlogStream contentStream) { |
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66 if (hgRepo == null) { |
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67 throw new IllegalArgumentException(); |
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68 } |
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69 if (contentStream == null) { |
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70 throw new IllegalArgumentException(); |
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71 } |
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72 repo = hgRepo; |
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73 content = contentStream; |
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74 } |
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75 |
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76 // invalid Revlog |
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77 protected Revlog(HgRepository hgRepo) { |
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78 repo = hgRepo; |
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79 content = null; |
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80 } |
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81 |
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82 public final HgRepository getRepo() { |
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83 return repo; |
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84 } |
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85 |
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86 public final int getRevisionCount() { |
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87 return content.revisionCount(); |
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88 } |
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89 |
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90 public final int getLastRevision() { |
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91 return content.revisionCount() - 1; |
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92 } |
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93 |
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94 /** |
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95 * Map revision index to unique revision identifier (nodeid). |
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96 * |
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97 * @param revision index of the entry in this revlog, may be {@link HgRepository#TIP} |
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98 * @return revision nodeid of the entry |
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99 * |
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100 * @throws HgInvalidRevisionException if supplied argument doesn't represent revision index in this revlog |
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101 * @throws HgInvalidControlFileException if access to revlog index/data entry failed |
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102 */ |
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103 public final Nodeid getRevision(int revision) throws HgInvalidRevisionException, HgInvalidControlFileException { |
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104 // XXX cache nodeids? Rather, if context.getCache(this).getRevisionMap(create == false) != null, use it |
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105 return Nodeid.fromBinary(content.nodeid(revision), 0); |
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106 } |
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107 |
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108 /** |
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109 * FIXME need to be careful about (1) ordering of the revisions in the return list; (2) modifications (sorting) of the argument array |
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110 */ |
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111 public final List<Nodeid> getRevisions(int... revisions) throws HgInvalidRevisionException, HgInvalidControlFileException { |
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112 ArrayList<Nodeid> rv = new ArrayList<Nodeid>(revisions.length); |
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113 Arrays.sort(revisions); |
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114 getRevisionsInternal(rv, revisions); |
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115 return rv; |
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116 } |
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117 |
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118 /*package-local*/ void getRevisionsInternal(final List<Nodeid> retVal, int[] sortedRevs) throws HgInvalidRevisionException, HgInvalidControlFileException { |
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119 // once I have getRevisionMap and may find out whether it is avalable from cache, |
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120 // may use it, perhaps only for small number of revisions |
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121 content.iterate(sortedRevs, false, new RevlogStream.Inspector() { |
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122 |
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123 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess data) { |
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124 retVal.add(Nodeid.fromBinary(nodeid, 0)); |
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125 } |
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126 }); |
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127 } |
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128 |
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129 /** |
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130 * Get local index of the specified revision. |
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131 * If unsure, use {@link #isKnown(Nodeid)} to find out whether nodeid belongs to this revlog. |
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132 * |
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133 * For occasional queries, this method works with decent performance, despite its O(n/2) approach. |
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134 * Alternatively, if you need to perform multiple queries (e.g. at least 15-20), {@link RevisionMap} may come handy. |
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135 * |
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136 * @param nid revision to look up |
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137 * @return revision local index in this revlog |
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138 * @throws HgInvalidRevisionException if supplied nodeid doesn't identify any revision from this revlog |
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139 * @throws HgInvalidControlFileException if access to revlog index/data entry failed |
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140 */ |
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141 public final int getRevisionIndex(Nodeid nid) throws HgInvalidControlFileException, HgInvalidRevisionException { |
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142 int revision = content.findRevisionIndex(nid); |
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143 if (revision == BAD_REVISION) { |
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144 // using toString() to identify revlog. HgDataFile.toString includes path, HgManifest and HgChangelog instances |
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145 // are fine with default (class name) |
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146 // Perhaps, more tailored description method would be suitable here |
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147 throw new HgInvalidRevisionException(String.format("Can't find revision %s in %s", nid.shortNotation(), this), nid, null); |
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148 } |
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149 return revision; |
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150 } |
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151 |
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152 /** |
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153 * @deprecated use {@link #getRevisionIndex(Nodeid)} instead |
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154 */ |
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155 @Deprecated |
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156 public final int getLocalRevision(Nodeid nid) throws HgInvalidControlFileException, HgInvalidRevisionException { |
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157 return getRevisionIndex(nid); |
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158 } |
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159 |
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160 |
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161 /** |
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162 * Note, {@link Nodeid#NULL} nodeid is not reported as known in any revlog. |
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163 * |
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164 * @param nodeid |
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165 * @return |
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166 * @throws HgInvalidControlFileException if access to revlog index/data entry failed |
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167 */ |
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168 public final boolean isKnown(Nodeid nodeid) throws HgInvalidControlFileException { |
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169 final int rn = content.findRevisionIndex(nodeid); |
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170 if (BAD_REVISION == rn) { |
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171 return false; |
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172 } |
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173 if (rn < 0 || rn >= content.revisionCount()) { |
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174 // Sanity check |
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175 throw new HgBadStateException(String.format("Revision index %d found for nodeid %s is not from the range [0..%d]", rn, nodeid.shortNotation(), content.revisionCount()-1)); |
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176 } |
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177 return true; |
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178 } |
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179 |
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180 /** |
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181 * Access to revision data as is, equivalent to <code>rawContent(getRevisionIndex(nodeid), sink)</code> |
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182 * |
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183 * @param nodeid revision to retrieve |
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184 * @param sink data destination |
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185 * |
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186 * @throws HgInvalidRevisionException if supplied argument doesn't represent revision index in this revlog |
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187 * @throws HgInvalidControlFileException if access to revlog index/data entry failed |
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188 * @throws CancelledException if content retrieval operation was cancelled |
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189 * |
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190 * @see #rawContent(int, ByteChannel) |
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191 */ |
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192 protected void rawContent(Nodeid nodeid, ByteChannel sink) throws HgInvalidControlFileException, CancelledException, HgInvalidRevisionException { |
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193 rawContent(getRevisionIndex(nodeid), sink); |
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194 } |
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195 |
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196 /** |
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197 * Access to revision data as is (decompressed, but otherwise unprocessed, i.e. not parsed for e.g. changeset or manifest entries). |
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198 * |
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199 * @param fileRevisionIndex index of this revlog change (not a changelog revision index), non-negative. From predefined constants, only {@link HgRepository#TIP} makes sense. |
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200 * @param sink data destination |
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201 * |
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202 * @throws HgInvalidRevisionException if supplied argument doesn't represent revision index in this revlog |
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203 * @throws HgInvalidControlFileException if access to revlog index/data entry failed |
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204 * @throws CancelledException if content retrieval operation was cancelled |
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205 */ |
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206 protected void rawContent(int fileRevisionIndex, ByteChannel sink) throws HgInvalidControlFileException, CancelledException, HgInvalidRevisionException { |
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207 if (sink == null) { |
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208 throw new IllegalArgumentException(); |
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209 } |
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210 try { |
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211 ContentPipe insp = new ContentPipe(sink, 0, repo.getContext().getLog()); |
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212 insp.checkCancelled(); |
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213 content.iterate(fileRevisionIndex, fileRevisionIndex, true, insp); |
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214 insp.checkFailed(); |
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215 } catch (IOException ex) { |
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216 HgInvalidControlFileException e = new HgInvalidControlFileException(String.format("Access to revision %d content failed", fileRevisionIndex), ex, null); |
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217 e.setRevisionIndex(fileRevisionIndex); |
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218 // FIXME e.setFileName(content.getIndexFile() or this.getHumanFriendlyPath()) - shall decide whether |
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219 // protected abstract getPath() with impl in HgDataFile, HgManifest and HgChangelog or path is data of either Revlog or RevlogStream |
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220 // Do the same (add file name) below |
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221 throw e; |
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222 } catch (HgInvalidControlFileException ex) { |
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223 throw ex; |
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224 } catch (HgException ex) { |
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225 HgInvalidControlFileException e = new HgInvalidControlFileException(ex.getClass().getSimpleName(), ex, null); |
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226 e.setRevisionIndex(fileRevisionIndex); |
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227 throw e; |
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228 } |
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229 } |
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230 |
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231 /** |
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232 * Fills supplied arguments with information about revision parents. |
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233 * |
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234 * @param revision - revision to query parents, or {@link HgRepository#TIP} |
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235 * @param parentRevisions - int[2] to get local revision numbers of parents (e.g. {6, -1}), {@link HgRepository#NO_REVISION} indicates parent not set |
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236 * @param parent1 - byte[20] or null, if parent's nodeid is not needed |
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237 * @param parent2 - byte[20] or null, if second parent's nodeid is not needed |
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238 * @throws HgInvalidRevisionException |
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239 * @throws HgInvalidControlFileException FIXME |
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240 * @throws IllegalArgumentException |
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241 */ |
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242 public void parents(int revision, int[] parentRevisions, byte[] parent1, byte[] parent2) throws HgInvalidRevisionException, HgInvalidControlFileException { |
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243 if (revision != TIP && !(revision >= 0 && revision < content.revisionCount())) { |
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244 throw new HgInvalidRevisionException(revision); |
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245 } |
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246 if (parentRevisions == null || parentRevisions.length < 2) { |
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247 throw new IllegalArgumentException(String.valueOf(parentRevisions)); |
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248 } |
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249 if (parent1 != null && parent1.length < 20) { |
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250 throw new IllegalArgumentException(parent1.toString()); |
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251 } |
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252 if (parent2 != null && parent2.length < 20) { |
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253 throw new IllegalArgumentException(parent2.toString()); |
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254 } |
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255 class ParentCollector implements RevlogStream.Inspector { |
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256 public int p1 = -1; |
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257 public int p2 = -1; |
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258 public byte[] nodeid; |
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259 |
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260 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess da) { |
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261 p1 = parent1Revision; |
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262 p2 = parent2Revision; |
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263 this.nodeid = new byte[20]; |
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264 // nodeid arg now comes in 32 byte from (as in file format description), however upper 12 bytes are zeros. |
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265 System.arraycopy(nodeid, nodeid.length > 20 ? nodeid.length - 20 : 0, this.nodeid, 0, 20); |
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266 } |
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267 }; |
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268 ParentCollector pc = new ParentCollector(); |
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269 content.iterate(revision, revision, false, pc); |
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270 // although next code looks odd (NO_REVISION *is* -1), it's safer to be explicit |
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271 parentRevisions[0] = pc.p1 == -1 ? NO_REVISION : pc.p1; |
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272 parentRevisions[1] = pc.p2 == -1 ? NO_REVISION : pc.p2; |
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273 if (parent1 != null) { |
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274 if (parentRevisions[0] == NO_REVISION) { |
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275 Arrays.fill(parent1, 0, 20, (byte) 0); |
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276 } else { |
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277 content.iterate(parentRevisions[0], parentRevisions[0], false, pc); |
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278 System.arraycopy(pc.nodeid, 0, parent1, 0, 20); |
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279 } |
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280 } |
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281 if (parent2 != null) { |
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282 if (parentRevisions[1] == NO_REVISION) { |
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283 Arrays.fill(parent2, 0, 20, (byte) 0); |
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284 } else { |
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285 content.iterate(parentRevisions[1], parentRevisions[1], false, pc); |
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286 System.arraycopy(pc.nodeid, 0, parent2, 0, 20); |
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287 } |
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288 } |
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289 } |
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290 |
324
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291 @Experimental |
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292 public void walk(int start, int end, final Revlog.Inspector inspector) throws HgInvalidRevisionException, HgInvalidControlFileException { |
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293 int lastRev = getLastRevision(); |
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294 if (start == TIP) { |
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295 start = lastRev; |
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296 } |
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297 if (end == TIP) { |
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298 end = lastRev; |
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299 } |
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300 final RevisionInspector revisionInsp = Adaptable.Factory.getAdapter(inspector, RevisionInspector.class, null); |
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301 final ParentInspector parentInsp = Adaptable.Factory.getAdapter(inspector, ParentInspector.class, null); |
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302 final Nodeid[] allRevisions = parentInsp == null ? null : new Nodeid[end - start + 1]; |
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303 |
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304 content.iterate(start, end, false, new RevlogStream.Inspector() { |
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305 |
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306 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess data) { |
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307 Nodeid nid = Nodeid.fromBinary(nodeid, 0); |
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308 if (revisionInsp != null) { |
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309 revisionInsp.next(revisionNumber, nid, linkRevision); |
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310 } |
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311 if (parentInsp != null) { |
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312 Nodeid p1 = parent1Revision == -1 ? Nodeid.NULL : allRevisions[parent1Revision]; |
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313 Nodeid p2 = parent2Revision == -1 ? Nodeid.NULL : allRevisions[parent2Revision]; |
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314 allRevisions[revisionNumber] = nid; |
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315 parentInsp.next(revisionNumber, nid, parent1Revision, parent2Revision, p1, p2); |
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316 } |
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317 } |
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318 }); |
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319 } |
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320 |
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321 /** |
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322 * MARKER |
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323 */ |
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324 @Experimental |
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325 public interface Inspector { |
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326 } |
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327 |
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328 @Experimental |
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329 public interface RevisionInspector extends Inspector { |
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330 void next(int revisionIndex, Nodeid revision, int linkedRevisionIndex); |
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331 } |
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332 |
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333 @Experimental |
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334 public interface ParentInspector extends Inspector { |
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335 // XXX document whether parentX is -1 or a constant (BAD_REVISION? or dedicated?) |
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336 void next(int revisionIndex, Nodeid revision, int parent1, int parent2, Nodeid nidParent1, Nodeid nidParent2); |
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337 } |
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338 |
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339 /* |
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340 * XXX think over if it's better to do either: |
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341 * pw = getChangelog().new ParentWalker(); pw.init() and pass pw instance around as needed |
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342 * or |
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343 * add Revlog#getParentWalker(), static class, make cons() and #init package-local, and keep SoftReference to allow walker reuse. |
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344 * |
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345 * and yes, walker is not a proper name |
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346 */ |
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347 public final class ParentWalker implements ParentInspector { |
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348 |
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349 |
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350 private Nodeid[] sequential; // natural repository order, childrenOf rely on ordering |
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351 private Nodeid[] sorted; // for binary search |
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352 private int[] sorted2natural; |
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353 private Nodeid[] firstParent; |
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354 private Nodeid[] secondParent; |
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355 |
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356 // Nodeid instances shall be shared between all arrays |
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357 |
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358 public ParentWalker() { |
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359 } |
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360 |
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361 public HgRepository getRepo() { |
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362 return Revlog.this.getRepo(); |
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363 } |
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364 |
324
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365 public void next(int revisionNumber, Nodeid revision, int parent1Revision, int parent2Revision, Nodeid nidParent1, Nodeid nidParent2) { |
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366 if (parent1Revision >= revisionNumber || parent2Revision >= revisionNumber) { |
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367 throw new IllegalStateException(); // sanity, revisions are sequential |
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368 } |
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369 int ix = revisionNumber; |
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370 sequential[ix] = sorted[ix] = revision; |
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371 if (parent1Revision != -1) { |
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372 firstParent[ix] = sequential[parent1Revision]; |
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373 } |
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374 if (parent2Revision != -1) { // revlog of DataAccess.java has p2 set when p1 is -1 |
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375 secondParent[ix] = sequential[parent2Revision]; |
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376 } |
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377 } |
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378 |
366
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379 public void init() throws HgInvalidControlFileException { |
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380 final int revisionCount = Revlog.this.getRevisionCount(); |
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381 firstParent = new Nodeid[revisionCount]; |
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382 // TODO [post 1.0] Branches/merges are less frequent, and most of secondParent would be -1/null, hence |
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383 // IntMap might be better alternative here, but need to carefully analyze (test) whether this brings |
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384 // real improvement (IntMap has 2n capacity, and element lookup is log(n) instead of array's constant) |
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385 secondParent = new Nodeid[revisionCount]; |
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386 // |
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387 sequential = new Nodeid[revisionCount]; |
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388 sorted = new Nodeid[revisionCount]; |
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389 Revlog.this.walk(0, TIP, this); |
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390 Arrays.sort(sorted); |
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391 sorted2natural = new int[revisionCount]; |
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392 for (int i = 0; i < revisionCount; i++) { |
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393 Nodeid n = sequential[i]; |
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394 int x = Arrays.binarySearch(sorted, n); |
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395 assertSortedIndex(x); |
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396 sorted2natural[x] = i; |
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397 } |
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398 } |
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399 |
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400 private void assertSortedIndex(int x) { |
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401 if (x < 0) { |
403
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402 throw new HgBadStateException(String.format("Bad index", x)); |
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403 } |
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404 } |
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405 |
393
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406 /** |
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407 * Tells whether supplied revision is from the walker's associated revlog. |
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408 * Note, {@link Nodeid#NULL}, although implicitly present as parent of a first revision, is not recognized as known. |
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409 * @param nid revision to check, not <code>null</code> |
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410 * @return <code>true</code> if revision matches any revision in this revlog |
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411 */ |
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412 public boolean knownNode(Nodeid nid) { |
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413 return Arrays.binarySearch(sorted, nid) >= 0; |
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414 } |
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415 |
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416 /** |
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417 * null if none. only known nodes (as per #knownNode) are accepted as arguments |
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418 */ |
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419 public Nodeid firstParent(Nodeid nid) { |
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420 int x = Arrays.binarySearch(sorted, nid); |
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421 assertSortedIndex(x); |
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422 int i = sorted2natural[x]; |
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423 return firstParent[i]; |
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424 } |
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425 |
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426 // never null, Nodeid.NULL if none known |
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427 public Nodeid safeFirstParent(Nodeid nid) { |
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428 Nodeid rv = firstParent(nid); |
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429 return rv == null ? Nodeid.NULL : rv; |
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430 } |
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431 |
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432 public Nodeid secondParent(Nodeid nid) { |
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433 int x = Arrays.binarySearch(sorted, nid); |
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434 assertSortedIndex(x); |
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435 int i = sorted2natural[x]; |
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436 return secondParent[i]; |
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437 } |
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438 |
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439 public Nodeid safeSecondParent(Nodeid nid) { |
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440 Nodeid rv = secondParent(nid); |
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441 return rv == null ? Nodeid.NULL : rv; |
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442 } |
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443 |
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444 public boolean appendParentsOf(Nodeid nid, Collection<Nodeid> c) { |
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445 int x = Arrays.binarySearch(sorted, nid); |
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446 assertSortedIndex(x); |
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447 int i = sorted2natural[x]; |
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448 Nodeid p1 = firstParent[i]; |
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449 boolean modified = false; |
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450 if (p1 != null) { |
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451 modified = c.add(p1); |
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452 } |
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453 Nodeid p2 = secondParent[i]; |
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454 if (p2 != null) { |
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455 modified = c.add(p2) || modified; |
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456 } |
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457 return modified; |
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458 } |
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459 |
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460 // XXX alternative (and perhaps more reliable) approach would be to make a copy of allNodes and remove |
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461 // nodes, their parents and so on. |
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462 |
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463 // @return ordered collection of all children rooted at supplied nodes. Nodes shall not be descendants of each other! |
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464 // Nodeids shall belong to this revlog |
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465 public List<Nodeid> childrenOf(List<Nodeid> roots) { |
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466 HashSet<Nodeid> parents = new HashSet<Nodeid>(); |
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467 LinkedList<Nodeid> result = new LinkedList<Nodeid>(); |
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468 int earliestRevision = Integer.MAX_VALUE; |
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469 assert sequential.length == firstParent.length && firstParent.length == secondParent.length; |
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470 // first, find earliest index of roots in question, as there's no sense |
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471 // to check children among nodes prior to branch's root node |
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472 for (Nodeid r : roots) { |
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473 int x = Arrays.binarySearch(sorted, r); |
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474 assertSortedIndex(x); |
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475 int i = sorted2natural[x]; |
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476 if (i < earliestRevision) { |
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477 earliestRevision = i; |
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478 } |
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479 parents.add(sequential[i]); // add canonical instance in hope equals() is bit faster when can do a == |
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480 } |
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481 for (int i = earliestRevision + 1; i < sequential.length; i++) { |
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482 if (parents.contains(firstParent[i]) || parents.contains(secondParent[i])) { |
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483 parents.add(sequential[i]); // to find next child |
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484 result.add(sequential[i]); |
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485 } |
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486 } |
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487 return result; |
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488 } |
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489 |
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490 /** |
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491 * @return revisions that have supplied revision as their immediate parent |
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492 */ |
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493 public List<Nodeid> directChildren(Nodeid nid) { |
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494 LinkedList<Nodeid> result = new LinkedList<Nodeid>(); |
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495 int x = Arrays.binarySearch(sorted, nid); |
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496 assertSortedIndex(x); |
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497 nid = sorted[x]; // canonical instance |
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498 int start = sorted2natural[x]; |
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499 for (int i = start + 1; i < sequential.length; i++) { |
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500 if (nid == firstParent[i] || nid == secondParent[i]) { |
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501 result.add(sequential[i]); |
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502 } |
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503 } |
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504 return result; |
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505 } |
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506 |
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507 /** |
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508 * @param nid possibly parent node, shall be {@link #knownNode(Nodeid) known} in this revlog. |
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509 * @return <code>true</code> if there's any node in this revlog that has specified node as one of its parents. |
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510 */ |
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511 public boolean hasChildren(Nodeid nid) { |
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512 int x = Arrays.binarySearch(sorted, nid); |
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513 assertSortedIndex(x); |
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514 int i = sorted2natural[x]; |
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515 assert firstParent.length == secondParent.length; // just in case later I implement sparse array for secondParent |
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516 assert firstParent.length == sequential.length; |
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517 // to use == instead of equals, take the same Nodeid instance we used to fill all the arrays. |
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518 final Nodeid canonicalNode = sequential[i]; |
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519 i++; // no need to check node itself. child nodes may appear in sequential only after revision in question |
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520 for (; i < sequential.length; i++) { |
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521 // TODO [post 1.0] likely, not very effective. |
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522 // May want to optimize it with another (Tree|Hash)Set, created on demand on first use, |
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523 // however, need to be careful with memory usage |
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524 if (firstParent[i] == canonicalNode || secondParent[i] == canonicalNode) { |
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525 return true; |
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526 } |
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527 } |
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528 return false; |
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529 } |
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530 } |
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531 |
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532 /** |
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533 * Effective int to Nodeid and vice versa translation. It's advised to use this class instead of |
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534 * multiple {@link Revlog#getRevisionIndex(Nodeid)} calls. |
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535 * |
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536 * {@link Revlog#getRevisionIndex(Nodeid)} with straightforward lookup approach performs O(n/2) |
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537 * {@link RevisionMap#revisionIndex(Nodeid)} is log(n), plus initialization is O(n) (just once). |
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538 */ |
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539 public final class RevisionMap implements RevisionInspector { |
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540 /* |
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541 * in fact, initialization is much slower as it instantiates Nodeids, while #getRevisionIndex |
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542 * compares directly against byte buffer. Measuring cpython with 70k+ gives 3 times difference (47 vs 171) |
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543 * for complete changelog iteration. |
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544 */ |
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545 |
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546 /* |
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547 * XXX 3 * (x * 4) bytes. Can I do better? |
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548 * It seems, yes. Don't need to keep sorted, always can emulate it with indirect access to sequential through sorted2natural. |
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549 * i.e. instead sorted[mid].compareTo(toFind), do sequential[sorted2natural[mid]].compareTo(toFind) |
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550 */ |
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551 private Nodeid[] sequential; // natural repository order, childrenOf rely on ordering |
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552 private Nodeid[] sorted; // for binary search |
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553 private int[] sorted2natural; |
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554 |
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555 public RevisionMap() { |
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556 } |
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557 |
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558 public HgRepository getRepo() { |
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559 return Revlog.this.getRepo(); |
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560 } |
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561 |
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562 public void next(int revisionIndex, Nodeid revision, int linkedRevision) { |
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563 sequential[revisionIndex] = sorted[revisionIndex] = revision; |
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564 } |
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565 |
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566 /** |
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567 * @return <code>this</code> for convenience. |
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568 */ |
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569 public RevisionMap init(/*XXX Pool<Nodeid> to reuse nodeids, if possible. */) throws HgInvalidControlFileException{ |
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570 // XXX HgRepository.register((RepoChangeListener) this); // listen to changes in repo, re-init if needed? |
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571 final int revisionCount = Revlog.this.getRevisionCount(); |
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572 sequential = new Nodeid[revisionCount]; |
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573 sorted = new Nodeid[revisionCount]; |
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574 Revlog.this.walk(0, TIP, this); |
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575 // next is alternative to Arrays.sort(sorted), and build sorted2natural looking up each element of sequential in sorted. |
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576 // the way sorted2natural was build is O(n*log n). |
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577 final ArrayHelper ah = new ArrayHelper(); |
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578 ah.sort(sorted); |
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579 // note, values in ArrayHelper#getReversed are 1-based indexes, not 0-based |
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580 sorted2natural = ah.getReverse(); |
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581 return this; |
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582 } |
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583 |
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584 public Nodeid revision(int revisionIndex) { |
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585 return sequential[revisionIndex]; |
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586 } |
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587 public int revisionIndex(Nodeid revision) { |
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588 if (revision == null || revision.isNull()) { |
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589 return BAD_REVISION; |
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590 } |
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591 int x = Arrays.binarySearch(sorted, revision); |
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592 if (x < 0) { |
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593 return BAD_REVISION; |
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594 } |
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595 return sorted2natural[x]-1; |
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596 } |
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597 /** |
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598 * @deprecated use {@link #revisionIndex(Nodeid)} instead |
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599 */ |
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600 @Deprecated |
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601 public int localRevision(Nodeid revision) { |
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602 return revisionIndex(revision); |
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603 } |
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604 } |
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605 |
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606 protected abstract static class ErrorHandlingInspector implements RevlogStream.Inspector, CancelSupport { |
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607 private Exception failure; |
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608 private CancelSupport cancelSupport; |
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609 |
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610 protected void setCancelSupport(CancelSupport cs) { |
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611 assert cancelSupport == null; // no reason to set it twice |
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612 cancelSupport = cs; |
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613 } |
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614 |
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615 protected void recordFailure(Exception ex) { |
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616 assert failure == null; |
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617 failure = ex; |
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618 } |
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619 |
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620 // TODO consider if IOException in addition to HgException is of any real utility |
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621 public void checkFailed() throws HgException, IOException, CancelledException { |
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622 if (failure == null) { |
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623 return; |
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624 } |
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625 if (failure instanceof IOException) { |
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626 throw (IOException) failure; |
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627 } |
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628 if (failure instanceof CancelledException) { |
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629 throw (CancelledException) failure; |
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630 } |
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631 if (failure instanceof HgException) { |
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632 throw (HgException) failure; |
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633 } |
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634 throw new HgBadStateException(failure); |
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635 } |
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636 |
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637 public void checkCancelled() throws CancelledException { |
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638 if (cancelSupport != null) { |
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639 cancelSupport.checkCancelled(); |
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640 } |
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641 } |
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642 } |
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643 |
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644 protected static class ContentPipe extends ErrorHandlingInspector implements RevlogStream.Inspector, CancelSupport { |
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645 private final ByteChannel sink; |
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646 private final int offset; |
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647 private final LogFacility logFacility; |
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648 |
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649 /** |
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650 * @param _sink - cannot be <code>null</code> |
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651 * @param seekOffset - when positive, orders to pipe bytes to the sink starting from specified offset, not from the first byte available in DataAccess |
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652 * @param log optional facility to put warnings/debug messages into, may be null. |
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653 */ |
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654 public ContentPipe(ByteChannel _sink, int seekOffset, LogFacility log) { |
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655 assert _sink != null; |
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656 sink = _sink; |
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657 setCancelSupport(CancelSupport.Factory.get(_sink)); |
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658 offset = seekOffset; |
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659 logFacility = log; |
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660 } |
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661 |
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662 protected void prepare(int revisionNumber, DataAccess da) throws HgException, IOException { |
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663 if (offset > 0) { // save few useless reset/rewind operations |
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664 da.seek(offset); |
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665 } |
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666 } |
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667 |
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668 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess da) { |
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669 try { |
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670 prepare(revisionNumber, da); // XXX perhaps, prepare shall return DA (sliced, if needed) |
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671 final ProgressSupport progressSupport = ProgressSupport.Factory.get(sink); |
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672 ByteBuffer buf = ByteBuffer.allocate(actualLen > 8192 ? 8192 : actualLen); |
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673 Preview p = Adaptable.Factory.getAdapter(sink, Preview.class, null); |
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674 if (p != null) { |
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675 progressSupport.start(2 * da.length()); |
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676 while (!da.isEmpty()) { |
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677 checkCancelled(); |
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678 da.readBytes(buf); |
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679 p.preview(buf); |
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680 buf.clear(); |
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681 } |
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682 da.reset(); |
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683 prepare(revisionNumber, da); |
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684 progressSupport.worked(da.length()); |
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685 buf.clear(); |
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686 } else { |
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687 progressSupport.start(da.length()); |
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688 } |
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689 while (!da.isEmpty()) { |
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690 checkCancelled(); |
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691 da.readBytes(buf); |
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692 buf.flip(); // post: position == 0 |
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693 // XXX I may not rely on returned number of bytes but track change in buf position instead. |
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694 |
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695 int consumed = sink.write(buf); |
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696 if ((consumed == 0 || consumed != buf.position()) && logFacility != null) { |
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697 logFacility.warn(getClass(), "Bad data sink when reading revision %d. Reported %d bytes consumed, byt actually read %d", revisionNumber, consumed, buf.position()); |
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698 } |
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699 if (buf.position() == 0) { |
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700 throw new HgBadStateException("Bad sink implementation (consumes no bytes) results in endless loop"); |
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701 } |
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702 buf.compact(); // ensure (a) there's space for new (b) data starts at 0 |
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703 progressSupport.worked(consumed); |
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704 } |
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705 progressSupport.done(); // XXX shall specify whether #done() is invoked always or only if completed successfully. |
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706 } catch (IOException ex) { |
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707 recordFailure(ex); |
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708 } catch (CancelledException ex) { |
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709 recordFailure(ex); |
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710 } catch (HgException ex) { |
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711 recordFailure(ex); |
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712 } |
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713 } |
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714 } |
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715 } |