Mercurial > hg4j

annotate src/org/tmatesoft/hg/internal/RevisionDescendants.java @ 450:03fd8d079e9c smartgit3

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Share PhasesHelper instance among few HgChangesets (mostly affects HgChangesetTreeHandler case)
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Thu, 07 Jun 2012 17:06:23 +0200
parents 5787e912f60e
children 7bcfbc255f48
rev   line source
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1 /*
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2 * Copyright (c) 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.internal;
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18
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19 import java.util.BitSet;
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20
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21 import org.tmatesoft.hg.core.HgBadStateException;
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22 import org.tmatesoft.hg.core.HgInvalidControlFileException;
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23 import org.tmatesoft.hg.core.Nodeid;
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24 import org.tmatesoft.hg.repo.HgChangelog;
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25 import org.tmatesoft.hg.repo.HgRepository;
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26
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27 /**
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28 * Represent indicators which revisions are descendants of the supplied root revision
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29 * This is sort of lightweight alternative to ParentWalker#childrenOf
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30 *
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31 * @author Artem Tikhomirov
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32 * @author TMate Software Ltd.
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33 */
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34 public class RevisionDescendants {
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35
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36 private final HgRepository repo;
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37 private final int rootRevIndex;
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38 private final int tipRevIndex; // this is the last revision we cache to
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39 private final BitSet descendants;
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40
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41 // in fact, may be refactored to deal not only with changelog, but any revlog (not sure what would be the usecase, though)
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42 public RevisionDescendants(HgRepository hgRepo, int revisionIndex) {
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43 repo = hgRepo;
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44 rootRevIndex = revisionIndex;
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45 // even if tip moves, we still answer correctly for those isCandidate()
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46 tipRevIndex = repo.getChangelog().getLastRevision();
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47 if (revisionIndex < 0 || revisionIndex > tipRevIndex) {
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48 String m = "Revision to build descendants for shall be in range [%d,%d], not %d";
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49 throw new IllegalArgumentException(String.format(m, 0, tipRevIndex, revisionIndex));
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50 }
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51 descendants = new BitSet(tipRevIndex - rootRevIndex + 1);
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52 }
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53
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54 public void build() throws HgInvalidControlFileException {
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55 final BitSet result = descendants;
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56 result.set(0);
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57 if (rootRevIndex == tipRevIndex) {
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58 return;
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59 }
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60 repo.getChangelog().walk(rootRevIndex+1, tipRevIndex, new HgChangelog.ParentInspector() {
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61 // TODO ParentRevisionInspector, with no parent nodeids, just indexes?
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62
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63 private int i = 1; // above we start with revision next to rootRevIndex, which is at offset 0
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64 public void next(int revisionIndex, Nodeid revision, int parent1, int parent2, Nodeid nidParent1, Nodeid nidParent2) {
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65 int p1x = parent1 - rootRevIndex;
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66 int p2x = parent2 - rootRevIndex;
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67 boolean p1IsDescendant = false, p2IsDescendant = false;
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68 if (p1x >= 0) { // parent1 is among descendants candidates
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69 assert p1x < result.size();
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70 p1IsDescendant = result.get(p1x);
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71 }
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72 if (p2x >= 0) {
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73 assert p2x < result.size();
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74 p2IsDescendant = result.get(p2x);
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75 }
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76 //
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77 int rx = revisionIndex -rootRevIndex;
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78 if (rx != i) {
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79 throw new HgBadStateException();
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80 }
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81 // current revision is descentand if any of its parents is descendant
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82 result.set(rx, p1IsDescendant || p2IsDescendant);
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83 i++;
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84 }
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85 });
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86 }
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87
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88 // deliberately doesn't allow TIP
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89 public boolean isCandidate(int revIndex) {
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90 return (revIndex >= rootRevIndex && revIndex <= tipRevIndex) ;
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91 }
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92
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93 public boolean hasDescendants() { // isEmpty is better name?
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94 // bit at rootRevIndex is always set
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95 return descendants.nextSetBit(rootRevIndex+1) != -1;
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96 }
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97
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98 public boolean isDescendant(int revisionIndex) {
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99 assert isCandidate(revisionIndex);
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100 int ix = revisionIndex - rootRevIndex;
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101 assert ix < descendants.size();
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102 return descendants.get(ix);
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103 }
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104 }