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annotate src/org/tmatesoft/hg/repo/HgRevisionMap.java @ 433:be697c3e951e

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Revlog.RevisionMap helper class got promoted as TLC, renamed to HgRevisionMap
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Fri, 30 Mar 2012 16:43:09 +0200
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children 6526d8adbc0f
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433
be697c3e951e Revlog.RevisionMap helper class got promoted as TLC, renamed to HgRevisionMap
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1 /*
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2 * Copyright (c) 2011-2012 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.TIP;
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21
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22 import java.util.Arrays;
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23
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24 import org.tmatesoft.hg.core.Nodeid;
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25 import org.tmatesoft.hg.internal.ArrayHelper;
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26 import org.tmatesoft.hg.repo.Revlog.RevisionInspector;
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27
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28 /**
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29 * Effective int to Nodeid and vice versa translation. It's advised to use this class instead of
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30 * multiple {@link Revlog#getRevisionIndex(Nodeid)} calls. Rule of thumb is 20+ calls (given
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31 * initialization costs). It's also important to take into account memory consumption, for huge
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32 * repositories use of this class may pay off only when accessing greatest fraction of all revisions.
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33 *
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34 * <p>Next code snippet shows instantiation and sample use:
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35 * <pre>
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36 * RevisionMap<HgChangelog> clogMap = new RevisionMap<HgChangelog>(clog).init();
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37 * RevisionMap<HgDataFile> fileMap = new RevisionMap<HgDataFile>(fileNode).init();
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38 *
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39 * int fileRevIndex = 0;
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40 * Nodeid fileRev = fileMap.revision(fileRevIndex);
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41 * int csetRevIndex = fileNode.getChangesetRevisionIndex(fileRevIndex);
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42 * Nodeid csetRev = clogMap.revision(localCset);
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43 * changesetToNodeidMap.put(csetRev, fileRev);
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44 * </pre>
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45 *
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46 * <p>
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47 * {@link Revlog#getRevisionIndex(Nodeid)} with straightforward lookup approach performs O(n/2)
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48 * <p>
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49 * {@link HgRevisionMap#revisionIndex(Nodeid)} is log(n), plus initialization is O(n) (just once).
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50 *
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51 * @see HgParentChildMap
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52 *
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53 * @author Artem Tikhomirov
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54 * @author TMate Software Ltd.
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55 */
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56 public final class HgRevisionMap<T extends Revlog> implements RevisionInspector {
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57 /*
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58 * in fact, initialization is much slower as it instantiates Nodeids, while #getRevisionIndex
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59 * compares directly against byte buffer. Measuring cpython with 70k+ gives 3 times difference (47 vs 171)
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60 * for complete changelog iteration.
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61 */
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62
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63 /*
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64 * XXX 3 * (x * 4) bytes. Can I do better?
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65 * It seems, yes. Don't need to keep sorted, always can emulate it with indirect access to sequential through sorted2natural.
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66 * i.e. instead sorted[mid].compareTo(toFind), do sequential[sorted2natural[mid]].compareTo(toFind)
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67 */
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68 private Nodeid[] sequential; // natural repository order, childrenOf rely on ordering
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69 private Nodeid[] sorted; // for binary search
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70 private int[] sorted2natural;
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71 private final T revlog;
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72
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73 public HgRevisionMap(T owner) {
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74 revlog = owner;
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75 }
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76
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77 public HgRepository getRepo() {
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78 return revlog.getRepo();
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79 }
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80
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81 public void next(int revisionIndex, Nodeid revision, int linkedRevision) {
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82 sequential[revisionIndex] = sorted[revisionIndex] = revision;
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83 }
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84
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85 /**
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86 * @return <code>this</code> for convenience.
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87 */
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88 public HgRevisionMap<T> init(/*XXX Pool<Nodeid> to reuse nodeids, if possible. */) throws HgInvalidControlFileException{
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89 // XXX HgRepository.register((RepoChangeListener) this); // listen to changes in repo, re-init if needed?
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90 final int revisionCount = revlog.getRevisionCount();
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91 sequential = new Nodeid[revisionCount];
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92 sorted = new Nodeid[revisionCount];
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93 revlog.indexWalk(0, TIP, this);
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94 // next is alternative to Arrays.sort(sorted), and build sorted2natural looking up each element of sequential in sorted.
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95 // the way sorted2natural was build is O(n*log n).
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96 final ArrayHelper ah = new ArrayHelper();
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97 ah.sort(sorted);
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98 // note, values in ArrayHelper#getReversed are 1-based indexes, not 0-based
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99 sorted2natural = ah.getReverse();
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100 return this;
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101 }
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102
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103 public Nodeid revision(int revisionIndex) {
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104 return sequential[revisionIndex];
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105 }
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106 public int revisionIndex(Nodeid revision) {
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107 if (revision == null || revision.isNull()) {
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108 return BAD_REVISION;
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109 }
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110 int x = Arrays.binarySearch(sorted, revision);
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111 if (x < 0) {
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112 return BAD_REVISION;
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113 }
be697c3e951e Revlog.RevisionMap helper class got promoted as TLC, renamed to HgRevisionMap
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
114 return sorted2natural[x]-1;
be697c3e951e Revlog.RevisionMap helper class got promoted as TLC, renamed to HgRevisionMap
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
115 }
be697c3e951e Revlog.RevisionMap helper class got promoted as TLC, renamed to HgRevisionMap
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
116 }