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annotate src/org/tmatesoft/hg/repo/HgParentChildMap.java @ 652:cd77bf51b562

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Push: tests. Commit respects phases.new-commit setting. Fix outgoing when changes are not children of common (Issue 47)
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 02 Jul 2013 23:21:16 +0200
parents 3b275cc2d2aa
children 629a7370554c
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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19 import static org.tmatesoft.hg.repo.HgRepository.TIP;
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20
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21 import java.util.ArrayList;
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22 import java.util.Arrays;
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23 import java.util.BitSet;
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24 import java.util.Collection;
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25 import java.util.Collections;
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26 import java.util.HashSet;
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27 import java.util.LinkedList;
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28 import java.util.List;
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30 import org.tmatesoft.hg.core.Nodeid;
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31 import org.tmatesoft.hg.repo.Revlog.ParentInspector;
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32
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33 /**
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34 * Helper class to deal with parent-child relationship between revisions <i>en masse</i>.
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35 * Works in terms of {@link Nodeid nodeids}, there's no need to deal with revision indexes.
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36 * For a given revision, answers questions like "who's my parent and what are my immediate children".
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37 *
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38 * <p>Comes handy when multiple revisions are analyzed and distinct {@link Revlog#parents(int, int[], byte[], byte[])}
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39 * queries are ineffective.
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40 *
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41 * <p>Next code snippet shows typical use:
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42 * <pre>
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43 * HgChangelog clog = repo.getChangelog();
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44 * ParentWalker&lt;HgChangelog> pw = new ParentWalker&lt;HgChangelog>(clog);
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45 * pw.init();
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46 *
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47 * Nodeid me = Nodeid.fromAscii("...");
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48 * List<Nodei> immediateChildren = pw.directChildren(me);
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49 * </pre>
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50 *
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51 *
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52 * <p> Perhaps, later may add alternative way to access (and reuse) map instance, Revlog#getParentWalker(),
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53 * that instantiates and initializes ParentWalker, and keep SoftReference to allow its reuse.
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54 *
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55 * @see HgRevisionMap
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56 *
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57 * @author Artem Tikhomirov
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58 * @author TMate Software Ltd.
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59 */
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60 public final class HgParentChildMap<T extends Revlog> implements ParentInspector {
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61
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62 // IMPORTANT: Nodeid instances shall be shared between all arrays
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63
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64 private Nodeid[] sequential; // natural repository order, childrenOf rely on ordering
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65 private Nodeid[] sorted; // for binary search
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66 private int[] sorted2natural; // indexes in sorted to indexes in sequential
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67 private Nodeid[] firstParent; // parents by natural order (i.e. firstParent[A] is parent of revision with index A)
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68 private Nodeid[] secondParent;
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69 private final T revlog;
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70 private BitSet heads; // 1 indicates revision got children
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71
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73 public HgParentChildMap(T owner) {
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74 revlog = owner;
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75 }
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76
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77 public HgRepository getRepo() {
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78 return revlog.getRepo();
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79 }
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80
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81 public void next(int revisionNumber, Nodeid revision, int parent1Revision, int parent2Revision, Nodeid nidParent1, Nodeid nidParent2) {
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82 if (parent1Revision >= revisionNumber || parent2Revision >= revisionNumber) {
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83 throw new IllegalStateException(); // sanity, revisions are sequential
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84 }
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85 int ix = revisionNumber;
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86 sequential[ix] = sorted[ix] = revision;
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87 if (parent1Revision != -1) {
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88 firstParent[ix] = sequential[parent1Revision];
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89 heads.set(parent1Revision);
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90 }
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91 if (parent2Revision != -1) { // revlog of DataAccess.java has p2 set when p1 is -1
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92 secondParent[ix] = sequential[parent2Revision];
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93 heads.set(parent2Revision);
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94 }
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95 }
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96
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97 /**
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98 * Prepare the map
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99 * @throws HgInvalidControlFileException if failed to access revlog index/data entry. <em>Runtime exception</em>
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100 * @throws HgRuntimeException subclass thereof to indicate other issues with the library. <em>Runtime exception</em>
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101 */
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102 public void init() throws HgRuntimeException {
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103 final int revisionCount = revlog.getRevisionCount();
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104 firstParent = new Nodeid[revisionCount];
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105 // TODO [post 1.1] Branches/merges are less frequent, and most of secondParent would be -1/null, hence
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106 // IntMap might be better alternative here, but need to carefully analyze (test) whether this brings
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107 // real improvement (IntMap has 2n capacity, and element lookup is log(n) instead of array's constant)
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108 secondParent = new Nodeid[revisionCount];
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109 //
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110 sequential = new Nodeid[revisionCount];
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111 sorted = new Nodeid[revisionCount];
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112 heads = new BitSet(revisionCount);
432
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diff changeset
113 revlog.indexWalk(0, TIP, this);
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diff changeset
114 Arrays.sort(sorted);
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
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diff changeset
115 sorted2natural = new int[revisionCount];
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parents:
diff changeset
116 for (int i = 0; i < revisionCount; i++) {
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
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diff changeset
117 Nodeid n = sequential[i];
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diff changeset
118 int x = Arrays.binarySearch(sorted, n);
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diff changeset
119 assertSortedIndex(x);
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diff changeset
120 sorted2natural[x] = i;
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diff changeset
121 }
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diff changeset
122 }
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
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diff changeset
123
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
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diff changeset
124 private void assertSortedIndex(int x) {
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diff changeset
125 if (x < 0) {
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diff changeset
126 throw new HgInvalidStateException(String.format("Bad index", x));
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127 }
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diff changeset
128 }
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129
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
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diff changeset
130 /**
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diff changeset
131 * Tells whether supplied revision is from the walker's associated revlog.
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diff changeset
132 * Note, {@link Nodeid#NULL}, although implicitly present as parent of a first revision, is not recognized as known.
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133 * @param nid revision to check, not <code>null</code>
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134 * @return <code>true</code> if revision matches any revision in this revlog
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diff changeset
135 */
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diff changeset
136 public boolean knownNode(Nodeid nid) {
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diff changeset
137 return Arrays.binarySearch(sorted, nid) >= 0;
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138 }
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139
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diff changeset
140 /**
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141 * null if none. only known nodes (as per #knownNode) are accepted as arguments
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diff changeset
142 */
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diff changeset
143 public Nodeid firstParent(Nodeid nid) {
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diff changeset
144 int x = Arrays.binarySearch(sorted, nid);
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diff changeset
145 assertSortedIndex(x);
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diff changeset
146 int i = sorted2natural[x];
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diff changeset
147 return firstParent[i];
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148 }
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149
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diff changeset
150 // never null, Nodeid.NULL if none known
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diff changeset
151 public Nodeid safeFirstParent(Nodeid nid) {
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diff changeset
152 Nodeid rv = firstParent(nid);
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diff changeset
153 return rv == null ? Nodeid.NULL : rv;
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154 }
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155
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diff changeset
156 public Nodeid secondParent(Nodeid nid) {
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diff changeset
157 int x = Arrays.binarySearch(sorted, nid);
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diff changeset
158 assertSortedIndex(x);
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diff changeset
159 int i = sorted2natural[x];
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diff changeset
160 return secondParent[i];
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diff changeset
161 }
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diff changeset
162
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diff changeset
163 public Nodeid safeSecondParent(Nodeid nid) {
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
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diff changeset
164 Nodeid rv = secondParent(nid);
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diff changeset
165 return rv == null ? Nodeid.NULL : rv;
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parents:
diff changeset
166 }
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parents:
diff changeset
167
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parents:
diff changeset
168 public boolean appendParentsOf(Nodeid nid, Collection<Nodeid> c) {
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diff changeset
169 int x = Arrays.binarySearch(sorted, nid);
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diff changeset
170 assertSortedIndex(x);
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diff changeset
171 int i = sorted2natural[x];
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diff changeset
172 Nodeid p1 = firstParent[i];
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diff changeset
173 boolean modified = false;
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diff changeset
174 if (p1 != null) {
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diff changeset
175 modified = c.add(p1);
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diff changeset
176 }
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diff changeset
177 Nodeid p2 = secondParent[i];
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diff changeset
178 if (p2 != null) {
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diff changeset
179 modified = c.add(p2) || modified;
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diff changeset
180 }
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diff changeset
181 return modified;
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parents:
diff changeset
182 }
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parents:
diff changeset
183
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parents:
diff changeset
184 // XXX alternative (and perhaps more reliable) approach would be to make a copy of allNodes and remove
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diff changeset
185 // nodes, their parents and so on.
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diff changeset
186
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parents:
diff changeset
187 // @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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diff changeset
188 // Nodeids shall belong to this revlog
650
3b275cc2d2aa Push: phase4 - settle local and remote phases, push updated phases regardless of server publishing state, do not push secret changesets
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 646
diff changeset
189 public List<Nodeid> childrenOf(Collection<Nodeid> roots) {
645
14dac192aa26 Push: phase2 - upload bundle with changes to remote server
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parents: 628
diff changeset
190 if (roots.isEmpty()) {
14dac192aa26 Push: phase2 - upload bundle with changes to remote server
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parents: 628
diff changeset
191 return Collections.emptyList();
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parents: 628
diff changeset
192 }
432
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
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parents:
diff changeset
193 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
194 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
195 int earliestRevision = Integer.MAX_VALUE;
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parents:
diff changeset
196 assert sequential.length == firstParent.length && firstParent.length == secondParent.length;
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parents:
diff changeset
197 // first, find earliest index of roots in question, as there's no sense
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parents:
diff changeset
198 // to check children among nodes prior to branch's root node
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parents:
diff changeset
199 for (Nodeid r : roots) {
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
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parents:
diff changeset
200 int x = Arrays.binarySearch(sorted, r);
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parents:
diff changeset
201 assertSortedIndex(x);
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
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parents:
diff changeset
202 int i = sorted2natural[x];
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parents:
diff changeset
203 if (i < earliestRevision) {
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parents:
diff changeset
204 earliestRevision = i;
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parents:
diff changeset
205 }
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
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parents:
diff changeset
206 parents.add(sequential[i]); // add canonical instance in hope equals() is bit faster when can do a ==
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parents:
diff changeset
207 }
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
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parents:
diff changeset
208 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
209 if (parents.contains(firstParent[i]) || parents.contains(secondParent[i])) {
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
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parents:
diff changeset
210 parents.add(sequential[i]); // to find next child
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parents:
diff changeset
211 result.add(sequential[i]);
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parents:
diff changeset
212 }
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
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parents:
diff changeset
213 }
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
214 return result;
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
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parents:
diff changeset
215 }
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
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parents:
diff changeset
216
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
217 /**
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
218 * @return revisions that have supplied revision as their immediate parent
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
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parents:
diff changeset
219 */
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
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parents:
diff changeset
220 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
221 LinkedList<Nodeid> result = new LinkedList<Nodeid>();
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parents:
diff changeset
222 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
223 assertSortedIndex(x);
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
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parents:
diff changeset
224 nid = sorted[x]; // canonical instance
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
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parents:
diff changeset
225 int start = sorted2natural[x];
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
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parents:
diff changeset
226 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
227 if (nid == firstParent[i] || nid == secondParent[i]) {
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
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parents:
diff changeset
228 result.add(sequential[i]);
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
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parents:
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229 }
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230 }
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231 return result;
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232 }
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233
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234 /**
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235 * @param nid possibly parent node, shall be {@link #knownNode(Nodeid) known} in this revlog.
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236 * @return <code>true</code> if there's any node in this revlog that has specified node as one of its parents.
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237 */
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238 public boolean hasChildren(Nodeid nid) {
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239 int x = Arrays.binarySearch(sorted, nid);
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240 assertSortedIndex(x);
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241 int i = sorted2natural[x];
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242 return hasChildren(i);
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243 }
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244
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245 /**
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246 * @return all revisions this map knows about
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247 */
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248 public List<Nodeid> all() {
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249 return Arrays.asList(sequential);
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250 }
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251
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252 /**
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253 * Find out whether a given node is among descendants of another.
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254 *
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255 * @param root revision to check for being (grand-)*parent of a child
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256 * @param wannaBeChild candidate descendant revision
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257 * @return <code>true</code> if <code>wannaBeChild</code> is among children of <code>root</code>
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258 */
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259 public boolean isChild(Nodeid root, Nodeid wannaBeChild) {
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260 int x = Arrays.binarySearch(sorted, root);
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261 assertSortedIndex(x);
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262 root = sorted[x]; // canonical instance
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263 final int start = sorted2natural[x];
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264 if (!hasChildren(start)) {
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265 return false; // root got no children at all
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266 }
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267 int y = Arrays.binarySearch(sorted, wannaBeChild);
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268 if (y < 0) {
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269 return false; // not found
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270 }
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271 wannaBeChild = sorted[y]; // canonicalize
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272 final int end = sorted2natural[y];
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273 if (end <= start) {
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274 return false; // potential child was in repository earlier than root
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275 }
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276 HashSet<Nodeid> parents = new HashSet<Nodeid>();
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277 parents.add(root);
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278 for (int i = start + 1; i < end; i++) {
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279 if (parents.contains(firstParent[i]) || parents.contains(secondParent[i])) {
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280 parents.add(sequential[i]); // collect ancestors line
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281 }
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282 }
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283 return parents.contains(firstParent[end]) || parents.contains(secondParent[end]);
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284 }
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285
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286 /**
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287 * @return elements of this map that do not have a child recorded therein.
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288 */
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289 public Collection<Nodeid> heads() {
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290 ArrayList<Nodeid> result = new ArrayList<Nodeid>();
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291 int index = 0;
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292 do {
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293 index = heads.nextClearBit(index);
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294 result.add(sequential[index]);
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295 index++;
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296 } while (index < sequential.length);
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297 return result;
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298 }
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299
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300 private boolean hasChildren(int sequentialIndex) {
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301 return heads.get(sequentialIndex);
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302 }
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303 }