Mercurial > jhg

annotate src/org/tmatesoft/hg/internal/RevisionDescendants.java @ 527:47b7bedf0569

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Tests for present HgCheckoutCommand functionality. Update branch information on checkout. Use UTF8 encoding for the branch file
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 15 Jan 2013 19:46:19 +0100
parents 2a0b09eec376
children 6526d8adbc0f
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.Nodeid;
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22 import org.tmatesoft.hg.repo.HgChangelog;
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23 import org.tmatesoft.hg.repo.HgInvalidControlFileException;
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24 import org.tmatesoft.hg.repo.HgInvalidStateException;
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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().indexWalk(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 HgInvalidStateException(String.format("Sanity check failed. Revision %d. Expected:%d, was:%d", revisionIndex, rx, i));
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80 }
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81 // current revision is descendant 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 /**
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99 * Tells whether specified revision is on a descent line from the root revision.
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100 * <p>NOTE, root revision itself is considered to be its own descendant.
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101 *
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102 * @param revisionIndex revision index to check, shall pass {@link #isCandidate(int)}
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103 * @return <code>true</code> if revision is descendant of or is the same as root revision
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104 */
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105 public boolean isDescendant(int revisionIndex) {
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106 assert isCandidate(revisionIndex);
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107 int ix = revisionIndex - rootRevIndex;
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108 assert ix < descendants.size();
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109 return descendants.get(ix);
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110 }
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111 }