Mercurial > jhg

annotate src/org/tmatesoft/hg/internal/RevisionDescendants.java @ 683:98ff1fb49abe

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Update commands to use changeset Nodeid and int in uniform way, clients of core.* classes shall not go back and forth from int to Nodeid
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Wed, 24 Jul 2013 16:40:15 +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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parents: 628
diff changeset
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 }