Mercurial > jhg

annotate src/org/tmatesoft/hg/internal/RevisionDescendants.java @ 680:58a6900f845d

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Blame: alternative strategy to handle merge revisions: map(diff(p1->base->p2)) to understand merge intentions better
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Sun, 21 Jul 2013 17:15:34 +0200
parents 690e71d29bf6
children
rev   line source
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1 /*
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2 * Copyright (c) 2012-2013 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.ArrayList;
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20 import java.util.BitSet;
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21
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22 import org.tmatesoft.hg.core.Nodeid;
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23 import org.tmatesoft.hg.repo.HgChangelog;
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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 import org.tmatesoft.hg.repo.HgRuntimeException;
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27
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28 /**
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29 * Represent indicators which revisions are descendants of the supplied root revision
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30 * This is sort of lightweight alternative to ParentWalker#childrenOf
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31 *
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32 * @author Artem Tikhomirov
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33 * @author TMate Software Ltd.
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34 */
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35 public class RevisionDescendants {
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36
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37 private final HgRepository repo;
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38 private final int rootRevIndex;
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39 private final int tipRevIndex; // this is the last revision we cache to
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40 private final BitSet descendants;
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41 private RevisionSet revset;
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42
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43 // 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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44 public RevisionDescendants(HgRepository hgRepo, int revisionIndex) throws HgRuntimeException {
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45 repo = hgRepo;
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46 rootRevIndex = revisionIndex;
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47 // even if tip moves, we still answer correctly for those isCandidate()
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48 tipRevIndex = repo.getChangelog().getLastRevision();
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49 if (revisionIndex < 0 || revisionIndex > tipRevIndex) {
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50 String m = "Revision to build descendants for shall be in range [%d,%d], not %d";
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51 throw new IllegalArgumentException(String.format(m, 0, tipRevIndex, revisionIndex));
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52 }
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53 descendants = new BitSet(tipRevIndex - rootRevIndex + 1);
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54 }
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55
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56 public void build() throws HgRuntimeException {
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57 final BitSet result = descendants;
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58 result.set(0);
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59 if (rootRevIndex == tipRevIndex) {
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60 return;
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61 }
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62 repo.getChangelog().indexWalk(rootRevIndex+1, tipRevIndex, new HgChangelog.ParentInspector() {
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63 // TODO ParentRevisionInspector, with no parent nodeids, just indexes?
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64
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65 private int i = 1; // above we start with revision next to rootRevIndex, which is at offset 0
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66 public void next(int revisionIndex, Nodeid revision, int parent1, int parent2, Nodeid nidParent1, Nodeid nidParent2) {
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67 int p1x = parent1 - rootRevIndex;
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68 int p2x = parent2 - rootRevIndex;
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69 boolean p1IsDescendant = false, p2IsDescendant = false;
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70 if (p1x >= 0) { // parent1 is among descendants candidates
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71 assert p1x < result.size();
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72 p1IsDescendant = result.get(p1x);
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73 }
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74 if (p2x >= 0) {
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75 assert p2x < result.size();
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76 p2IsDescendant = result.get(p2x);
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77 }
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78 //
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79 int rx = revisionIndex - rootRevIndex;
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80 if (rx != i) {
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81 throw new HgInvalidStateException(String.format("Sanity check failed. Revision %d. Expected:%d, was:%d", revisionIndex, rx, i));
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82 }
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83 // current revision is descendant if any of its parents is descendant
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84 result.set(rx, p1IsDescendant || p2IsDescendant);
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85 i++;
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86 }
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87 });
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88 }
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89
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90 // deliberately doesn't allow TIP
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91 public boolean isCandidate(int revIndex) {
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92 return (revIndex >= rootRevIndex && revIndex <= tipRevIndex) ;
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93 }
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94
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95 public boolean hasDescendants() { // isEmpty is better name?
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96 // bit at rootRevIndex is always set
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97 return descendants.nextSetBit(rootRevIndex+1) != -1;
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98 }
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99
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100 /**
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101 * Tells whether specified revision is on a descent line from the root revision.
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102 * <p>NOTE, root revision itself is considered to be its own descendant.
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103 *
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104 * @param revisionIndex revision index to check, shall pass {@link #isCandidate(int)}
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105 * @return <code>true</code> if revision is descendant of or is the same as root revision
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106 */
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107 public boolean isDescendant(int revisionIndex) {
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108 assert isCandidate(revisionIndex);
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109 int ix = revisionIndex - rootRevIndex;
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110 assert ix < descendants.size();
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111 return descendants.get(ix);
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112 }
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114 public RevisionSet asRevisionSet() {
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115 if (revset == null) {
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116 final ArrayList<Nodeid> revisions = new ArrayList<Nodeid>(descendants.cardinality());
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117 repo.getChangelog().indexWalk(rootRevIndex, tipRevIndex, new HgChangelog.RevisionInspector() {
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118
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119 public void next(int revisionIndex, Nodeid revision, int linkedRevisionIndex) throws HgRuntimeException {
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120 if (isDescendant(revisionIndex)) {
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121 revisions.add(revision);
690e71d29bf6 Introduced RevisionSet to ease update of phase roots on push
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 628
diff changeset
122 }
690e71d29bf6 Introduced RevisionSet to ease update of phase roots on push
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 628
diff changeset
123 }
690e71d29bf6 Introduced RevisionSet to ease update of phase roots on push
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 628
diff changeset
124 });
690e71d29bf6 Introduced RevisionSet to ease update of phase roots on push
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 628
diff changeset
125 assert revisions.size() == descendants.cardinality();
690e71d29bf6 Introduced RevisionSet to ease update of phase roots on push
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 628
diff changeset
126 revset = new RevisionSet(revisions);
690e71d29bf6 Introduced RevisionSet to ease update of phase roots on push
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 628
diff changeset
127 }
690e71d29bf6 Introduced RevisionSet to ease update of phase roots on push
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 628
diff changeset
128 return revset;
690e71d29bf6 Introduced RevisionSet to ease update of phase roots on push
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 628
diff changeset
129 }
449
5787e912f60e Speed up changeset phase detection when no parent cache is avalable
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
130 }