Mercurial > hg4j
annotate src/org/tmatesoft/hg/repo/Revlog.java @ 344:168f1994de7e
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author | Artem Tikhomirov <tikhomirov.artem@gmail.com> |
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date | Tue, 22 Nov 2011 02:57:14 +0100 |
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1 /* |
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2 * Copyright (c) 2010-2011 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.TIP; |
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21 |
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22 import java.io.IOException; |
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23 import java.nio.ByteBuffer; |
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24 import java.util.ArrayList; |
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25 import java.util.Arrays; |
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26 import java.util.Collection; |
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27 import java.util.HashSet; |
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28 import java.util.LinkedList; |
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29 import java.util.List; |
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30 |
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31 import org.tmatesoft.hg.core.HgBadStateException; |
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32 import org.tmatesoft.hg.core.HgException; |
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33 import org.tmatesoft.hg.core.Nodeid; |
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34 import org.tmatesoft.hg.internal.ArrayHelper; |
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35 import org.tmatesoft.hg.internal.DataAccess; |
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36 import org.tmatesoft.hg.internal.Experimental; |
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37 import org.tmatesoft.hg.internal.RevlogStream; |
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38 import org.tmatesoft.hg.util.Adaptable; |
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39 import org.tmatesoft.hg.util.ByteChannel; |
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40 import org.tmatesoft.hg.util.CancelSupport; |
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41 import org.tmatesoft.hg.util.CancelledException; |
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42 import org.tmatesoft.hg.util.ProgressSupport; |
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43 |
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44 |
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45 /** |
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46 * Base class for all Mercurial entities that are serialized in a so called revlog format (changelog, manifest, data files). |
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47 * |
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48 * Implementation note: |
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49 * Hides actual actual revlog stream implementation and its access methods (i.e. RevlogStream.Inspector), iow shall not expose anything internal |
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50 * in public methods. |
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51 * |
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52 * @author Artem Tikhomirov |
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53 * @author TMate Software Ltd. |
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54 */ |
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55 abstract class Revlog { |
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56 |
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57 private final HgRepository repo; |
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58 protected final RevlogStream content; |
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59 |
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60 protected Revlog(HgRepository hgRepo, RevlogStream contentStream) { |
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61 if (hgRepo == null) { |
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62 throw new IllegalArgumentException(); |
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63 } |
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64 if (contentStream == null) { |
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65 throw new IllegalArgumentException(); |
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66 } |
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67 repo = hgRepo; |
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68 content = contentStream; |
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69 } |
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70 |
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71 // invalid Revlog |
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72 protected Revlog(HgRepository hgRepo) { |
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73 repo = hgRepo; |
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74 content = null; |
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75 } |
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76 |
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77 public final HgRepository getRepo() { |
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78 return repo; |
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79 } |
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80 |
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81 public final int getRevisionCount() { |
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82 return content.revisionCount(); |
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83 } |
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84 |
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85 public final int getLastRevision() { |
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86 return content.revisionCount() - 1; |
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87 } |
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88 |
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89 public final Nodeid getRevision(int revision) { |
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90 // XXX cache nodeids? Rather, if context.getCache(this).getRevisionMap(create == false) != null, use it |
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91 return Nodeid.fromBinary(content.nodeid(revision), 0); |
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92 } |
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93 |
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94 /** |
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95 * 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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96 */ |
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97 public final List<Nodeid> getRevisions(int... revisions) { |
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98 ArrayList<Nodeid> rv = new ArrayList<Nodeid>(revisions.length); |
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99 Arrays.sort(revisions); |
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100 getRevisionsInternal(rv, revisions); |
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101 return rv; |
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102 } |
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103 |
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104 /*package-local*/ void getRevisionsInternal(final List<Nodeid> retVal, int[] sortedRevs) { |
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105 // once I have getRevisionMap and may find out whether it is avalable from cache, |
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106 // may use it, perhaps only for small number of revisions |
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107 content.iterate(sortedRevs, false, new RevlogStream.Inspector() { |
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108 |
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109 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess data) { |
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110 retVal.add(Nodeid.fromBinary(nodeid, 0)); |
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111 } |
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112 }); |
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113 } |
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114 |
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115 /** |
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116 * Get local revision number (index) of the specified revision. |
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117 * |
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118 * For occasional queries, this method works with decent performance, despite its O(n/2) approach. |
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119 * Alternatively, if you need to perform multiple queries (e.g. at least 15-20), {@link RevisionMap} may come handy. |
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120 * |
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121 * @param nid revision to look up |
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122 * @return revision index, or {@link HgRepository#BAD_REVISION} if specified revision not found. |
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123 */ |
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124 public final int getLocalRevision(Nodeid nid) { |
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125 int revision = content.findLocalRevisionNumber(nid); |
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126 if (revision == BAD_REVISION) { |
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127 throw new IllegalArgumentException(String.format("%s doesn't represent a revision of %s", nid.toString(), this /*XXX HgDataFile.getPath might be more suitable here*/)); |
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128 } |
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129 return revision; |
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130 } |
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131 |
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132 // Till now, i follow approach that NULL nodeid is never part of revlog |
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133 public final boolean isKnown(Nodeid nodeid) { |
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134 final int rn = content.findLocalRevisionNumber(nodeid); |
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135 if (BAD_REVISION == rn) { |
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136 return false; |
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137 } |
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138 if (rn < 0 || rn >= content.revisionCount()) { |
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139 // Sanity check |
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140 throw new IllegalStateException(); |
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141 } |
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142 return true; |
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143 } |
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144 |
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145 /** |
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146 * 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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147 * @param nodeid |
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148 */ |
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149 protected void rawContent(Nodeid nodeid, ByteChannel sink) throws HgException, IOException, CancelledException { |
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150 rawContent(getLocalRevision(nodeid), sink); |
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151 } |
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152 |
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153 /** |
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154 * @param revision - repo-local index of this file change (not a changelog revision number!) |
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155 */ |
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156 protected void rawContent(int revision, ByteChannel sink) throws HgException, IOException, CancelledException { |
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157 if (sink == null) { |
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158 throw new IllegalArgumentException(); |
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159 } |
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160 ContentPipe insp = new ContentPipe(sink, 0); |
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161 insp.checkCancelled(); |
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162 content.iterate(revision, revision, true, insp); |
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163 insp.checkFailed(); |
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164 } |
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165 |
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166 /** |
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167 * XXX perhaps, return value Nodeid[2] and boolean needNodeids is better (and higher level) API for this query? |
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168 * |
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169 * @param revision - revision to query parents, or {@link HgRepository#TIP} |
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170 * @param parentRevisions - int[2] to get local revision numbers of parents (e.g. {6, -1}) |
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171 * @param parent1 - byte[20] or null, if parent's nodeid is not needed |
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172 * @param parent2 - byte[20] or null, if second parent's nodeid is not needed |
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173 * @return |
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174 */ |
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175 public void parents(int revision, int[] parentRevisions, byte[] parent1, byte[] parent2) { |
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176 if (revision != TIP && !(revision >= 0 && revision < content.revisionCount())) { |
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177 throw new IllegalArgumentException(String.valueOf(revision)); |
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178 } |
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179 if (parentRevisions == null || parentRevisions.length < 2) { |
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180 throw new IllegalArgumentException(String.valueOf(parentRevisions)); |
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181 } |
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182 if (parent1 != null && parent1.length < 20) { |
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183 throw new IllegalArgumentException(parent1.toString()); |
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184 } |
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185 if (parent2 != null && parent2.length < 20) { |
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186 throw new IllegalArgumentException(parent2.toString()); |
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187 } |
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188 class ParentCollector implements RevlogStream.Inspector { |
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189 public int p1 = -1; |
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190 public int p2 = -1; |
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191 public byte[] nodeid; |
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192 |
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193 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess da) { |
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194 p1 = parent1Revision; |
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195 p2 = parent2Revision; |
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196 this.nodeid = new byte[20]; |
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197 // nodeid arg now comes in 32 byte from (as in file format description), however upper 12 bytes are zeros. |
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198 System.arraycopy(nodeid, nodeid.length > 20 ? nodeid.length - 20 : 0, this.nodeid, 0, 20); |
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199 } |
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200 }; |
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201 ParentCollector pc = new ParentCollector(); |
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202 content.iterate(revision, revision, false, pc); |
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203 parentRevisions[0] = pc.p1; |
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204 parentRevisions[1] = pc.p2; |
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205 if (parent1 != null) { |
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206 if (parentRevisions[0] == -1) { |
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207 Arrays.fill(parent1, 0, 20, (byte) 0); |
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208 } else { |
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209 content.iterate(parentRevisions[0], parentRevisions[0], false, pc); |
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210 System.arraycopy(pc.nodeid, 0, parent1, 0, 20); |
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211 } |
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212 } |
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213 if (parent2 != null) { |
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214 if (parentRevisions[1] == -1) { |
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215 Arrays.fill(parent2, 0, 20, (byte) 0); |
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216 } else { |
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217 content.iterate(parentRevisions[1], parentRevisions[1], false, pc); |
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218 System.arraycopy(pc.nodeid, 0, parent2, 0, 20); |
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219 } |
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220 } |
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221 } |
317
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222 |
324
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223 @Experimental |
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224 public void walk(int start, int end, final Revlog.Inspector inspector) { |
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225 int lastRev = getLastRevision(); |
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226 if (start == TIP) { |
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227 start = lastRev; |
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228 } |
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229 if (end == TIP) { |
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230 end = lastRev; |
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231 } |
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232 final RevisionInspector revisionInsp = getAdapter(inspector, RevisionInspector.class); |
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233 final ParentInspector parentInsp = getAdapter(inspector, ParentInspector.class); |
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234 final Nodeid[] allRevisions = parentInsp == null ? null : new Nodeid[end - start + 1]; |
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235 |
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236 content.iterate(start, end, false, new RevlogStream.Inspector() { |
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237 |
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238 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess data) { |
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239 Nodeid nid = Nodeid.fromBinary(nodeid, 0); |
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240 if (revisionInsp != null) { |
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241 revisionInsp.next(revisionNumber, nid, linkRevision); |
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242 } |
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243 if (parentInsp != null) { |
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244 Nodeid p1 = parent1Revision == -1 ? Nodeid.NULL : allRevisions[parent1Revision]; |
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245 Nodeid p2 = parent2Revision == -1 ? Nodeid.NULL : allRevisions[parent2Revision]; |
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246 allRevisions[revisionNumber] = nid; |
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247 parentInsp.next(revisionNumber, nid, parent1Revision, parent2Revision, p1, p2); |
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248 } |
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249 } |
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250 }); |
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251 } |
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252 private static <T> T getAdapter(Object o, Class<T> adapterClass) { |
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253 if (adapterClass.isInstance(o)) { |
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254 return adapterClass.cast(o); |
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255 } |
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256 if (o instanceof Adaptable) { |
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257 return ((Adaptable) o).getAdapter(adapterClass); |
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258 } |
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259 return null; |
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260 } |
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261 |
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262 /** |
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263 * MARKER |
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264 */ |
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265 @Experimental |
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266 public interface Inspector { |
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267 } |
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268 |
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269 @Experimental |
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270 public interface RevisionInspector extends Inspector { |
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271 void next(int localRevision, Nodeid revision, int linkedRevision); |
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272 } |
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273 |
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274 @Experimental |
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275 public interface ParentInspector extends Inspector { |
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276 // XXX document whether parentX is -1 or a constant (BAD_REVISION? or dedicated?) |
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277 void next(int localRevision, Nodeid revision, int parent1, int parent2, Nodeid nidParent1, Nodeid nidParent2); |
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278 } |
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279 |
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280 /* |
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281 * XXX think over if it's better to do either: |
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282 * pw = getChangelog().new ParentWalker(); pw.init() and pass pw instance around as needed |
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283 * or |
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284 * add Revlog#getParentWalker(), static class, make cons() and #init package-local, and keep SoftReference to allow walker reuse. |
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285 * |
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286 * and yes, walker is not a proper name |
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287 */ |
324
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288 public final class ParentWalker implements ParentInspector { |
200
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289 |
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290 |
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291 private Nodeid[] sequential; // natural repository order, childrenOf rely on ordering |
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292 private Nodeid[] sorted; // for binary search |
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293 private int[] sorted2natural; |
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294 private Nodeid[] firstParent; |
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295 private Nodeid[] secondParent; |
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296 |
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297 // Nodeid instances shall be shared between all arrays |
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298 |
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299 public ParentWalker() { |
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300 } |
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301 |
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302 public HgRepository getRepo() { |
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303 return Revlog.this.getRepo(); |
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304 } |
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305 |
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306 public void next(int revisionNumber, Nodeid revision, int parent1Revision, int parent2Revision, Nodeid nidParent1, Nodeid nidParent2) { |
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307 if (parent1Revision >= revisionNumber || parent2Revision >= revisionNumber) { |
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308 throw new IllegalStateException(); // sanity, revisions are sequential |
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309 } |
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310 int ix = revisionNumber; |
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311 sequential[ix] = sorted[ix] = revision; |
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312 if (parent1Revision != -1) { |
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313 firstParent[ix] = sequential[parent1Revision]; |
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314 } |
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315 if (parent2Revision != -1) { // revlog of DataAccess.java has p2 set when p1 is -1 |
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316 secondParent[ix] = sequential[parent2Revision]; |
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317 } |
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318 } |
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319 |
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320 public void init() { |
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321 final int revisionCount = Revlog.this.getRevisionCount(); |
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322 firstParent = new Nodeid[revisionCount]; |
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323 // although branches/merges are less frequent, and most of secondParent would be -1/null, some sort of |
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324 // SparseOrderedList might be handy, provided its inner structures do not overweight simplicity of an array |
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325 // FIXME IntMap is right candidate? |
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326 secondParent = new Nodeid[revisionCount]; |
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327 // |
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328 sequential = new Nodeid[revisionCount]; |
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329 sorted = new Nodeid[revisionCount]; |
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330 Revlog.this.walk(0, TIP, this); |
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331 Arrays.sort(sorted); |
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332 sorted2natural = new int[revisionCount]; |
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333 for (int i = 0; i < revisionCount; i++) { |
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334 Nodeid n = sequential[i]; |
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335 int x = Arrays.binarySearch(sorted, n); |
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336 assertSortedIndex(x); |
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337 sorted2natural[x] = i; |
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338 } |
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339 } |
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340 |
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341 private void assertSortedIndex(int x) { |
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342 if (x < 0) { |
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343 throw new HgBadStateException(); |
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344 } |
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345 } |
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346 |
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347 // FIXME need to decide whether Nodeid(00 * 20) is always known or not |
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348 // right now Nodeid.NULL is not recognized as known if passed to this method, |
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349 // caller is supposed to make explicit check |
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350 public boolean knownNode(Nodeid nid) { |
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351 return Arrays.binarySearch(sorted, nid) >= 0; |
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352 } |
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353 |
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354 /** |
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355 * null if none. only known nodes (as per #knownNode) are accepted as arguments |
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356 */ |
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357 public Nodeid firstParent(Nodeid nid) { |
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358 int x = Arrays.binarySearch(sorted, nid); |
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359 assertSortedIndex(x); |
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360 int i = sorted2natural[x]; |
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361 return firstParent[i]; |
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362 } |
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363 |
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364 // never null, Nodeid.NULL if none known |
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365 public Nodeid safeFirstParent(Nodeid nid) { |
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366 Nodeid rv = firstParent(nid); |
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367 return rv == null ? Nodeid.NULL : rv; |
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368 } |
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369 |
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370 public Nodeid secondParent(Nodeid nid) { |
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371 int x = Arrays.binarySearch(sorted, nid); |
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372 assertSortedIndex(x); |
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373 int i = sorted2natural[x]; |
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374 return secondParent[i]; |
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375 } |
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376 |
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377 public Nodeid safeSecondParent(Nodeid nid) { |
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378 Nodeid rv = secondParent(nid); |
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379 return rv == null ? Nodeid.NULL : rv; |
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380 } |
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381 |
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382 public boolean appendParentsOf(Nodeid nid, Collection<Nodeid> c) { |
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383 int x = Arrays.binarySearch(sorted, nid); |
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384 assertSortedIndex(x); |
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385 int i = sorted2natural[x]; |
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386 Nodeid p1 = firstParent[i]; |
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387 boolean modified = false; |
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388 if (p1 != null) { |
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389 modified = c.add(p1); |
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390 } |
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391 Nodeid p2 = secondParent[i]; |
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392 if (p2 != null) { |
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393 modified = c.add(p2) || modified; |
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394 } |
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395 return modified; |
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396 } |
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397 |
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398 // XXX alternative (and perhaps more reliable) approach would be to make a copy of allNodes and remove |
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399 // nodes, their parents and so on. |
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400 |
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401 // @return ordered collection of all children rooted at supplied nodes. Nodes shall not be descendants of each other! |
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402 // Nodeids shall belong to this revlog |
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403 public List<Nodeid> childrenOf(List<Nodeid> roots) { |
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404 HashSet<Nodeid> parents = new HashSet<Nodeid>(); |
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405 LinkedList<Nodeid> result = new LinkedList<Nodeid>(); |
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406 int earliestRevision = Integer.MAX_VALUE; |
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407 assert sequential.length == firstParent.length && firstParent.length == secondParent.length; |
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408 // first, find earliest index of roots in question, as there's no sense |
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409 // to check children among nodes prior to branch's root node |
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410 for (Nodeid r : roots) { |
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411 int x = Arrays.binarySearch(sorted, r); |
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412 assertSortedIndex(x); |
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413 int i = sorted2natural[x]; |
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414 if (i < earliestRevision) { |
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415 earliestRevision = i; |
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416 } |
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417 parents.add(sequential[i]); // add canonical instance in hope equals() is bit faster when can do a == |
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418 } |
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419 for (int i = earliestRevision + 1; i < sequential.length; i++) { |
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420 if (parents.contains(firstParent[i]) || parents.contains(secondParent[i])) { |
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421 parents.add(sequential[i]); // to find next child |
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422 result.add(sequential[i]); |
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423 } |
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424 } |
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425 return result; |
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426 } |
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427 |
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428 /** |
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429 * @return revisions that have supplied revision as their immediate parent |
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430 */ |
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431 public List<Nodeid> directChildren(Nodeid nid) { |
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432 LinkedList<Nodeid> result = new LinkedList<Nodeid>(); |
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433 int x = Arrays.binarySearch(sorted, nid); |
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434 assertSortedIndex(x); |
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435 nid = sorted[x]; // canonical instance |
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436 int start = sorted2natural[x]; |
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437 for (int i = start + 1; i < sequential.length; i++) { |
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438 if (nid == firstParent[i] || nid == secondParent[i]) { |
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439 result.add(sequential[i]); |
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440 } |
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441 } |
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442 return result; |
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443 } |
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444 |
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445 /** |
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446 * @param nid possibly parent node, shall be {@link #knownNode(Nodeid) known} in this revlog. |
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447 * @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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448 */ |
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449 public boolean hasChildren(Nodeid nid) { |
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450 int x = Arrays.binarySearch(sorted, nid); |
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451 assertSortedIndex(x); |
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452 int i = sorted2natural[x]; |
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453 assert firstParent.length == secondParent.length; // just in case later I implement sparse array for secondParent |
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454 assert firstParent.length == sequential.length; |
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455 // to use == instead of equals, take the same Nodeid instance we used to fill all the arrays. |
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456 final Nodeid canonicalNode = sequential[i]; |
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457 i++; // no need to check node itself. child nodes may appear in sequential only after revision in question |
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458 for (; i < sequential.length; i++) { |
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459 // FIXME likely, not very effective. |
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460 // May want to optimize it with another (Tree|Hash)Set, created on demand on first use, |
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461 // however, need to be careful with memory usage |
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462 if (firstParent[i] == canonicalNode || secondParent[i] == canonicalNode) { |
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463 return true; |
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464 } |
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465 } |
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466 return false; |
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467 } |
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468 } |
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469 |
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470 /** |
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471 * Effective int to Nodeid and vice versa translation. It's advised to use this class instead of |
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472 * multiple {@link Revlog#getLocalRevision(Nodeid)} calls. |
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473 * |
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474 * getLocalRevision(Nodeid) with straightforward lookup approach performs O(n/2) |
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475 * #localRevision() is log(n), plus initialization is O(n) |
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476 */ |
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477 public final class RevisionMap implements RevisionInspector { |
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478 /* |
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479 * in fact, initialization is much slower as it instantiates Nodeids, while #getLocalRevision |
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480 * compares directly against byte buffer. Measuring cpython with 70k+ gives 3 times difference (47 vs 171) |
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481 * for complete changelog iteration. |
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482 */ |
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483 |
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484 /* |
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485 * XXX 3 * (x * 4) bytes. Can I do better? |
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486 * It seems, yes. Don't need to keep sorted, always can emulate it with indirect access to sequential through sorted2natural. |
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487 * i.e. instead sorted[mid].compareTo(toFind), do sequential[sorted2natural[mid]].compareTo(toFind) |
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488 */ |
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489 private Nodeid[] sequential; // natural repository order, childrenOf rely on ordering |
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490 private Nodeid[] sorted; // for binary search |
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491 private int[] sorted2natural; |
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492 |
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493 public RevisionMap() { |
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494 } |
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495 |
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496 public HgRepository getRepo() { |
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497 return Revlog.this.getRepo(); |
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498 } |
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499 |
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500 public void next(int localRevision, Nodeid revision, int linkedRevision) { |
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501 sequential[localRevision] = sorted[localRevision] = revision; |
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502 } |
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503 |
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504 /** |
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505 * @return <code>this</code> for convenience. |
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506 */ |
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507 public RevisionMap init(/*XXX Pool<Nodeid> to reuse nodeids, if possible. */) { |
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508 // XXX HgRepository.register((RepoChangeListener) this); // listen to changes in repo, re-init if needed? |
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509 final int revisionCount = Revlog.this.getRevisionCount(); |
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510 sequential = new Nodeid[revisionCount]; |
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511 sorted = new Nodeid[revisionCount]; |
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512 Revlog.this.walk(0, TIP, this); |
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513 // next is alternative to Arrays.sort(sorted), and build sorted2natural looking up each element of sequential in sorted. |
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514 // the way sorted2natural was build is O(n*log n). |
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515 final ArrayHelper ah = new ArrayHelper(); |
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516 ah.sort(sorted); |
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517 // note, values in ArrayHelper#getReversed are 1-based indexes, not 0-based |
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518 sorted2natural = ah.getReverse(); |
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519 return this; |
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520 } |
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521 |
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522 public Nodeid revision(int localRevision) { |
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523 return sequential[localRevision]; |
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524 } |
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525 public int localRevision(Nodeid revision) { |
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526 if (revision == null || revision.isNull()) { |
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527 return BAD_REVISION; |
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528 } |
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529 int x = Arrays.binarySearch(sorted, revision); |
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530 if (x < 0) { |
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531 return BAD_REVISION; |
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532 } |
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533 return sorted2natural[x]-1; |
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534 } |
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535 } |
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536 |
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537 protected abstract static class ErrorHandlingInspector implements RevlogStream.Inspector, CancelSupport { |
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538 private Exception failure; |
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539 private CancelSupport cancelSupport; |
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540 |
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541 protected void setCancelSupport(CancelSupport cs) { |
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542 assert cancelSupport == null; // no reason to set it twice |
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543 cancelSupport = cs; |
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544 } |
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545 |
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546 protected void recordFailure(Exception ex) { |
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547 assert failure == null; |
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548 failure = ex; |
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549 } |
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550 |
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551 public void checkFailed() throws HgException, IOException, CancelledException { |
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552 if (failure == null) { |
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553 return; |
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554 } |
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555 if (failure instanceof IOException) { |
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556 throw (IOException) failure; |
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557 } |
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558 if (failure instanceof CancelledException) { |
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559 throw (CancelledException) failure; |
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560 } |
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561 if (failure instanceof HgException) { |
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562 throw (HgException) failure; |
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563 } |
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564 throw new HgBadStateException(failure); |
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565 } |
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566 |
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567 public void checkCancelled() throws CancelledException { |
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568 if (cancelSupport != null) { |
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569 cancelSupport.checkCancelled(); |
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570 } |
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571 } |
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572 } |
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573 |
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574 protected static class ContentPipe extends ErrorHandlingInspector implements RevlogStream.Inspector, CancelSupport { |
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575 private final ByteChannel sink; |
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576 private final int offset; |
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577 |
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578 /** |
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579 * @param _sink - cannot be <code>null</code> |
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580 * @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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581 */ |
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582 public ContentPipe(ByteChannel _sink, int seekOffset) { |
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583 assert _sink != null; |
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584 sink = _sink; |
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585 setCancelSupport(CancelSupport.Factory.get(_sink)); |
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586 offset = seekOffset; |
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587 } |
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588 |
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589 protected void prepare(int revisionNumber, DataAccess da) throws HgException, IOException { |
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590 if (offset > 0) { // save few useless reset/rewind operations |
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591 da.seek(offset); |
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592 } |
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593 } |
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594 |
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595 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess da) { |
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596 try { |
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597 prepare(revisionNumber, da); // XXX perhaps, prepare shall return DA (sliced, if needed) |
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598 final ProgressSupport progressSupport = ProgressSupport.Factory.get(sink); |
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599 ByteBuffer buf = ByteBuffer.allocate(512); |
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600 progressSupport.start(da.length()); |
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601 while (!da.isEmpty()) { |
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602 checkCancelled(); |
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603 da.readBytes(buf); |
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604 buf.flip(); |
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605 // XXX I may not rely on returned number of bytes but track change in buf position instead. |
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606 int consumed = sink.write(buf); |
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607 // FIXME in fact, bad sink implementation (that consumes no bytes) would result in endless loop. Need to account for this |
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608 buf.compact(); |
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609 progressSupport.worked(consumed); |
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610 } |
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611 progressSupport.done(); // XXX shall specify whether #done() is invoked always or only if completed successfully. |
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612 } catch (IOException ex) { |
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613 recordFailure(ex); |
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614 } catch (CancelledException ex) { |
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615 recordFailure(ex); |
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616 } catch (HgException ex) { |
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617 recordFailure(ex); |
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618 } |
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619 } |
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620 } |
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621 } |