Mercurial > jhg
annotate src/org/tmatesoft/hg/repo/HgRevisionMap.java @ 646:3b7d51ed4c65
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author | Artem Tikhomirov <tikhomirov.artem@gmail.com> |
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date | Fri, 21 Jun 2013 18:30:35 +0200 |
parents | 6526d8adbc0f |
children | 6334b0267103 |
rev | line source |
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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 HgRuntimeException { |
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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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Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
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changeset
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102 |
be697c3e951e
Revlog.RevisionMap helper class got promoted as TLC, renamed to HgRevisionMap
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
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changeset
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103 public Nodeid revision(int revisionIndex) { |
be697c3e951e
Revlog.RevisionMap helper class got promoted as TLC, renamed to HgRevisionMap
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff
changeset
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104 return sequential[revisionIndex]; |
be697c3e951e
Revlog.RevisionMap helper class got promoted as TLC, renamed to HgRevisionMap
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff
changeset
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105 } |
be697c3e951e
Revlog.RevisionMap helper class got promoted as TLC, renamed to HgRevisionMap
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff
changeset
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106 public int revisionIndex(Nodeid revision) { |
be697c3e951e
Revlog.RevisionMap helper class got promoted as TLC, renamed to HgRevisionMap
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff
changeset
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107 if (revision == null || revision.isNull()) { |
be697c3e951e
Revlog.RevisionMap helper class got promoted as TLC, renamed to HgRevisionMap
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff
changeset
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108 return BAD_REVISION; |
be697c3e951e
Revlog.RevisionMap helper class got promoted as TLC, renamed to HgRevisionMap
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff
changeset
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109 } |
be697c3e951e
Revlog.RevisionMap helper class got promoted as TLC, renamed to HgRevisionMap
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
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changeset
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110 int x = Arrays.binarySearch(sorted, revision); |
be697c3e951e
Revlog.RevisionMap helper class got promoted as TLC, renamed to HgRevisionMap
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff
changeset
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111 if (x < 0) { |
be697c3e951e
Revlog.RevisionMap helper class got promoted as TLC, renamed to HgRevisionMap
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff
changeset
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112 return BAD_REVISION; |
be697c3e951e
Revlog.RevisionMap helper class got promoted as TLC, renamed to HgRevisionMap
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff
changeset
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113 } |
be697c3e951e
Revlog.RevisionMap helper class got promoted as TLC, renamed to HgRevisionMap
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
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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
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115 } |
be697c3e951e
Revlog.RevisionMap helper class got promoted as TLC, renamed to HgRevisionMap
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
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116 } |