Mercurial > hg4j

annotate src/org/tmatesoft/hg/repo/HgParentChildMap.java @ 659:a5cf64f2e7e4 smartgit-4.6

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Poor performance when reading/collecting branch information. Respect new cache location for recent mercurial revisions. Use different algorithm to build branch cache
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Fri, 05 Jul 2013 20:42:45 +0200
parents 6526d8adbc0f
children af5223b86dd3
rev   line source
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1 /*
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2 * Copyright (c) 2011-2013 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.repo;
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18
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19 import static org.tmatesoft.hg.repo.HgRepository.TIP;
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20
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21 import java.util.Arrays;
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22 import java.util.Collection;
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23 import java.util.HashSet;
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24 import java.util.LinkedList;
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25 import java.util.List;
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27 import org.tmatesoft.hg.core.Nodeid;
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28 import org.tmatesoft.hg.repo.Revlog.ParentInspector;
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30 /**
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31 * Helper class to deal with parent-child relationship between revisions <i>en masse</i>.
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32 * Works in terms of {@link Nodeid nodeids}, there's no need to deal with revision indexes.
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33 * For a given revision, answers questions like "who's my parent and what are my immediate children".
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34 *
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35 * <p>Comes handy when multiple revisions are analyzed and distinct {@link Revlog#parents(int, int[], byte[], byte[])}
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36 * queries are ineffective.
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37 *
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38 * <p>Next code snippet shows typical use:
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39 * <pre>
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40 * HgChangelog clog = repo.getChangelog();
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41 * ParentWalker&lt;HgChangelog> pw = new ParentWalker&lt;HgChangelog>(clog);
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42 * pw.init();
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43 *
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44 * Nodeid me = Nodeid.fromAscii("...");
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45 * List<Nodei> immediateChildren = pw.directChildren(me);
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46 * </pre>
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47 *
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48 *
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49 * <p> Perhaps, later may add alternative way to access (and reuse) map instance, Revlog#getParentWalker(),
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50 * that instantiates and initializes ParentWalker, and keep SoftReference to allow its reuse.
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51 *
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52 * @see HgRevisionMap
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53 *
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54 * @author Artem Tikhomirov
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55 * @author TMate Software Ltd.
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56 */
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57 public final class HgParentChildMap<T extends Revlog> implements ParentInspector {
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58
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60 private Nodeid[] sequential; // natural repository order, childrenOf rely on ordering
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61 private Nodeid[] sorted; // for binary search
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62 private int[] sorted2natural;
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63 private Nodeid[] firstParent;
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64 private Nodeid[] secondParent;
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65 private final T revlog;
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66
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67 // Nodeid instances shall be shared between all arrays
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68
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69 public HgParentChildMap(T owner) {
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70 revlog = owner;
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71 }
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72
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73 public HgRepository getRepo() {
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74 return revlog.getRepo();
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75 }
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76
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77 public void next(int revisionNumber, Nodeid revision, int parent1Revision, int parent2Revision, Nodeid nidParent1, Nodeid nidParent2) {
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78 if (parent1Revision >= revisionNumber || parent2Revision >= revisionNumber) {
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79 throw new IllegalStateException(); // sanity, revisions are sequential
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80 }
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81 int ix = revisionNumber;
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82 sequential[ix] = sorted[ix] = revision;
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83 if (parent1Revision != -1) {
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84 firstParent[ix] = sequential[parent1Revision];
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85 }
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86 if (parent2Revision != -1) { // revlog of DataAccess.java has p2 set when p1 is -1
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87 secondParent[ix] = sequential[parent2Revision];
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88 }
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89 }
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90
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91 /**
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92 * Prepare the map
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93 * @throws HgInvalidControlFileException if failed to access revlog index/data entry. <em>Runtime exception</em>
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94 * @throws HgRuntimeException subclass thereof to indicate other issues with the library. <em>Runtime exception</em>
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95 */
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96 public void init() throws HgRuntimeException {
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97 final int revisionCount = revlog.getRevisionCount();
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98 firstParent = new Nodeid[revisionCount];
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99 // TODO [post 1.0] Branches/merges are less frequent, and most of secondParent would be -1/null, hence
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100 // IntMap might be better alternative here, but need to carefully analyze (test) whether this brings
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101 // real improvement (IntMap has 2n capacity, and element lookup is log(n) instead of array's constant)
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102 secondParent = new Nodeid[revisionCount];
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103 //
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104 sequential = new Nodeid[revisionCount];
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105 sorted = new Nodeid[revisionCount];
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106 revlog.indexWalk(0, TIP, this);
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107 Arrays.sort(sorted);
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108 sorted2natural = new int[revisionCount];
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109 for (int i = 0; i < revisionCount; i++) {
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110 Nodeid n = sequential[i];
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111 int x = Arrays.binarySearch(sorted, n);
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112 assertSortedIndex(x);
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113 sorted2natural[x] = i;
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parents:
diff changeset
114 }
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
115 }
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
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parents:
diff changeset
116
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parents:
diff changeset
117 private void assertSortedIndex(int x) {
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
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parents:
diff changeset
118 if (x < 0) {
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
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parents:
diff changeset
119 throw new HgInvalidStateException(String.format("Bad index", x));
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
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parents:
diff changeset
120 }
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
121 }
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
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parents:
diff changeset
122
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
123 /**
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
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parents:
diff changeset
124 * Tells whether supplied revision is from the walker's associated revlog.
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
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parents:
diff changeset
125 * Note, {@link Nodeid#NULL}, although implicitly present as parent of a first revision, is not recognized as known.
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
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parents:
diff changeset
126 * @param nid revision to check, not <code>null</code>
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parents:
diff changeset
127 * @return <code>true</code> if revision matches any revision in this revlog
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parents:
diff changeset
128 */
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
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parents:
diff changeset
129 public boolean knownNode(Nodeid nid) {
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diff changeset
130 return Arrays.binarySearch(sorted, nid) >= 0;
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parents:
diff changeset
131 }
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diff changeset
132
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
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parents:
diff changeset
133 /**
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parents:
diff changeset
134 * null if none. only known nodes (as per #knownNode) are accepted as arguments
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
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diff changeset
135 */
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
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parents:
diff changeset
136 public Nodeid firstParent(Nodeid nid) {
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
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diff changeset
137 int x = Arrays.binarySearch(sorted, nid);
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
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diff changeset
138 assertSortedIndex(x);
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parents:
diff changeset
139 int i = sorted2natural[x];
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
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diff changeset
140 return firstParent[i];
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parents:
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141 }
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142
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
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parents:
diff changeset
143 // never null, Nodeid.NULL if none known
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
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parents:
diff changeset
144 public Nodeid safeFirstParent(Nodeid nid) {
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
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diff changeset
145 Nodeid rv = firstParent(nid);
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parents:
diff changeset
146 return rv == null ? Nodeid.NULL : rv;
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parents:
diff changeset
147 }
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parents:
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148
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diff changeset
149 public Nodeid secondParent(Nodeid nid) {
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diff changeset
150 int x = Arrays.binarySearch(sorted, nid);
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parents:
diff changeset
151 assertSortedIndex(x);
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diff changeset
152 int i = sorted2natural[x];
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
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diff changeset
153 return secondParent[i];
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parents:
diff changeset
154 }
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
155
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
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parents:
diff changeset
156 public Nodeid safeSecondParent(Nodeid nid) {
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
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diff changeset
157 Nodeid rv = secondParent(nid);
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
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parents:
diff changeset
158 return rv == null ? Nodeid.NULL : rv;
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
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parents:
diff changeset
159 }
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
160
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
161 public boolean appendParentsOf(Nodeid nid, Collection<Nodeid> c) {
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
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parents:
diff changeset
162 int x = Arrays.binarySearch(sorted, nid);
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
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parents:
diff changeset
163 assertSortedIndex(x);
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parents:
diff changeset
164 int i = sorted2natural[x];
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
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parents:
diff changeset
165 Nodeid p1 = firstParent[i];
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
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parents:
diff changeset
166 boolean modified = false;
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
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parents:
diff changeset
167 if (p1 != null) {
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
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parents:
diff changeset
168 modified = c.add(p1);
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
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parents:
diff changeset
169 }
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parents:
diff changeset
170 Nodeid p2 = secondParent[i];
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
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parents:
diff changeset
171 if (p2 != null) {
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
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parents:
diff changeset
172 modified = c.add(p2) || modified;
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parents:
diff changeset
173 }
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
174 return modified;
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
175 }
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
176
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
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parents:
diff changeset
177 // XXX alternative (and perhaps more reliable) approach would be to make a copy of allNodes and remove
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parents:
diff changeset
178 // nodes, their parents and so on.
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diff changeset
179
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
180 // @return ordered collection of all children rooted at supplied nodes. Nodes shall not be descendants of each other!
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
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parents:
diff changeset
181 // Nodeids shall belong to this revlog
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
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parents:
diff changeset
182 public List<Nodeid> childrenOf(List<Nodeid> roots) {
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
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parents:
diff changeset
183 HashSet<Nodeid> parents = new HashSet<Nodeid>();
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
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parents:
diff changeset
184 LinkedList<Nodeid> result = new LinkedList<Nodeid>();
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
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parents:
diff changeset
185 int earliestRevision = Integer.MAX_VALUE;
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
186 assert sequential.length == firstParent.length && firstParent.length == secondParent.length;
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
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parents:
diff changeset
187 // first, find earliest index of roots in question, as there's no sense
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
188 // to check children among nodes prior to branch's root node
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
189 for (Nodeid r : roots) {
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
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parents:
diff changeset
190 int x = Arrays.binarySearch(sorted, r);
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
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parents:
diff changeset
191 assertSortedIndex(x);
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
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parents:
diff changeset
192 int i = sorted2natural[x];
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
193 if (i < earliestRevision) {
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
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parents:
diff changeset
194 earliestRevision = i;
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
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parents:
diff changeset
195 }
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
196 parents.add(sequential[i]); // add canonical instance in hope equals() is bit faster when can do a ==
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
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parents:
diff changeset
197 }
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
198 for (int i = earliestRevision + 1; i < sequential.length; i++) {
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
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parents:
diff changeset
199 if (parents.contains(firstParent[i]) || parents.contains(secondParent[i])) {
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
200 parents.add(sequential[i]); // to find next child
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
201 result.add(sequential[i]);
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
202 }
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
203 }
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
204 return result;
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
205 }
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
206
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
207 /**
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
208 * @return revisions that have supplied revision as their immediate parent
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
209 */
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
210 public List<Nodeid> directChildren(Nodeid nid) {
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
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parents:
diff changeset
211 LinkedList<Nodeid> result = new LinkedList<Nodeid>();
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
212 int x = Arrays.binarySearch(sorted, nid);
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
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parents:
diff changeset
213 assertSortedIndex(x);
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
214 nid = sorted[x]; // canonical instance
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
215 int start = sorted2natural[x];
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
216 for (int i = start + 1; i < sequential.length; i++) {
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
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parents:
diff changeset
217 if (nid == firstParent[i] || nid == secondParent[i]) {
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
218 result.add(sequential[i]);
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
219 }
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
220 }
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
221 return result;
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
222 }
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
223
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
224 /**
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
225 * @param nid possibly parent node, shall be {@link #knownNode(Nodeid) known} in this revlog.
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
226 * @return <code>true</code> if there's any node in this revlog that has specified node as one of its parents.
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
227 */
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
228 public boolean hasChildren(Nodeid nid) {
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
229 int x = Arrays.binarySearch(sorted, nid);
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
230 assertSortedIndex(x);
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231 int i = sorted2natural[x];
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232 assert firstParent.length == secondParent.length; // just in case later I implement sparse array for secondParent
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233 assert firstParent.length == sequential.length;
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234 // to use == instead of equals, take the same Nodeid instance we used to fill all the arrays.
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235 final Nodeid canonicalNode = sequential[i];
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236 i++; // no need to check node itself. child nodes may appear in sequential only after revision in question
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237 for (; i < sequential.length; i++) {
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238 // TODO [post 1.0] likely, not very effective.
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239 // May want to optimize it with another (Tree|Hash)Set, created on demand on first use,
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240 // however, need to be careful with memory usage
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241 if (firstParent[i] == canonicalNode || secondParent[i] == canonicalNode) {
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242 return true;
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243 }
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244 }
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245 return false;
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246 }
659
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247
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248 /**
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249 * Find out whether a given node is among descendants of another.
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250 *
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251 * @param root revision to check for being (grand-)*parent of a child
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252 * @param wannaBeChild candidate descendant revision
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253 * @return <code>true</code> if <code>wannaBeChild</code> is among children of <code>root</code>
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254 */
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255 public boolean isChild(Nodeid root, Nodeid wannaBeChild) {
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256 int x = Arrays.binarySearch(sorted, root);
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257 assertSortedIndex(x);
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258 root = sorted[x]; // canonical instance
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259 final int start = sorted2natural[x];
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260 int y = Arrays.binarySearch(sorted, wannaBeChild);
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261 if (y < 0) {
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262 return false; // not found
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263 }
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264 wannaBeChild = sorted[y]; // canonicalize
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265 final int end = sorted2natural[y];
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266 if (end <= start) {
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267 return false; // potential child was in repository earlier than root
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268 }
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269 HashSet<Nodeid> parents = new HashSet<Nodeid>();
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270 parents.add(root);
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271 for (int i = start + 1; i < end; i++) {
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272 if (parents.contains(firstParent[i]) || parents.contains(secondParent[i])) {
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273 parents.add(sequential[i]); // collect ancestors line
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274 }
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275 }
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276 return parents.contains(firstParent[end]) || parents.contains(secondParent[end]);
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277 }
432
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278 }