Mercurial > jhg

annotate src/org/tmatesoft/hg/repo/HgParentChildMap.java @ 434:7e1912b4ce99 v0.9.0

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Record few known issues while skimming through TODOs
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Fri, 30 Mar 2012 17:11:39 +0200
parents be697c3e951e
children 6526d8adbc0f
rev   line source
432
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1 /*
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2 * Copyright (c) 2011-2012 TMate Software Ltd
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3 *
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4 * This program is free software; you can redistribute it and/or modify
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5 * it under the terms of the GNU General Public License as published by
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6 * the Free Software Foundation; version 2 of the License.
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7 *
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8 * This program is distributed in the hope that it will be useful,
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9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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11 * GNU General Public License for more details.
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12 *
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13 * For information on how to redistribute this software under
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14 * the terms of a license other than GNU General Public License
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15 * contact TMate Software at support@hg4j.com
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16 */
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17 package org.tmatesoft.hg.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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26
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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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29
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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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59
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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 public void init() throws HgInvalidControlFileException {
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92 final int revisionCount = revlog.getRevisionCount();
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93 firstParent = new Nodeid[revisionCount];
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94 // TODO [post 1.0] Branches/merges are less frequent, and most of secondParent would be -1/null, hence
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95 // IntMap might be better alternative here, but need to carefully analyze (test) whether this brings
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96 // real improvement (IntMap has 2n capacity, and element lookup is log(n) instead of array's constant)
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97 secondParent = new Nodeid[revisionCount];
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98 //
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99 sequential = new Nodeid[revisionCount];
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100 sorted = new Nodeid[revisionCount];
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101 revlog.indexWalk(0, TIP, this);
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102 Arrays.sort(sorted);
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103 sorted2natural = new int[revisionCount];
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104 for (int i = 0; i < revisionCount; i++) {
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105 Nodeid n = sequential[i];
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106 int x = Arrays.binarySearch(sorted, n);
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107 assertSortedIndex(x);
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108 sorted2natural[x] = i;
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109 }
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110 }
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111
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112 private void assertSortedIndex(int x) {
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113 if (x < 0) {
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114 throw new HgInvalidStateException(String.format("Bad index", x));
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115 }
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116 }
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117
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diff changeset
118 /**
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diff changeset
119 * Tells whether supplied revision is from the walker's associated revlog.
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120 * Note, {@link Nodeid#NULL}, although implicitly present as parent of a first revision, is not recognized as known.
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121 * @param nid revision to check, not <code>null</code>
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122 * @return <code>true</code> if revision matches any revision in this revlog
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diff changeset
123 */
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diff changeset
124 public boolean knownNode(Nodeid nid) {
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125 return Arrays.binarySearch(sorted, nid) >= 0;
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126 }
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127
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128 /**
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129 * null if none. only known nodes (as per #knownNode) are accepted as arguments
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130 */
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131 public Nodeid firstParent(Nodeid nid) {
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132 int x = Arrays.binarySearch(sorted, nid);
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133 assertSortedIndex(x);
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134 int i = sorted2natural[x];
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135 return firstParent[i];
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136 }
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137
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138 // never null, Nodeid.NULL if none known
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139 public Nodeid safeFirstParent(Nodeid nid) {
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140 Nodeid rv = firstParent(nid);
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141 return rv == null ? Nodeid.NULL : rv;
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142 }
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143
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144 public Nodeid secondParent(Nodeid nid) {
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145 int x = Arrays.binarySearch(sorted, nid);
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146 assertSortedIndex(x);
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147 int i = sorted2natural[x];
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148 return secondParent[i];
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149 }
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150
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151 public Nodeid safeSecondParent(Nodeid nid) {
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152 Nodeid rv = secondParent(nid);
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153 return rv == null ? Nodeid.NULL : rv;
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154 }
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155
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156 public boolean appendParentsOf(Nodeid nid, Collection<Nodeid> c) {
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157 int x = Arrays.binarySearch(sorted, nid);
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diff changeset
158 assertSortedIndex(x);
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159 int i = sorted2natural[x];
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160 Nodeid p1 = firstParent[i];
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161 boolean modified = false;
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162 if (p1 != null) {
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163 modified = c.add(p1);
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164 }
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165 Nodeid p2 = secondParent[i];
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166 if (p2 != null) {
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167 modified = c.add(p2) || modified;
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168 }
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169 return modified;
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170 }
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171
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172 // XXX alternative (and perhaps more reliable) approach would be to make a copy of allNodes and remove
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173 // nodes, their parents and so on.
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174
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175 // @return ordered collection of all children rooted at supplied nodes. Nodes shall not be descendants of each other!
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176 // Nodeids shall belong to this revlog
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177 public List<Nodeid> childrenOf(List<Nodeid> roots) {
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178 HashSet<Nodeid> parents = new HashSet<Nodeid>();
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179 LinkedList<Nodeid> result = new LinkedList<Nodeid>();
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diff changeset
180 int earliestRevision = Integer.MAX_VALUE;
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diff changeset
181 assert sequential.length == firstParent.length && firstParent.length == secondParent.length;
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diff changeset
182 // first, find earliest index of roots in question, as there's no sense
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diff changeset
183 // to check children among nodes prior to branch's root node
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diff changeset
184 for (Nodeid r : roots) {
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diff changeset
185 int x = Arrays.binarySearch(sorted, r);
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diff changeset
186 assertSortedIndex(x);
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diff changeset
187 int i = sorted2natural[x];
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parents:
diff changeset
188 if (i < earliestRevision) {
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diff changeset
189 earliestRevision = i;
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diff changeset
190 }
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diff changeset
191 parents.add(sequential[i]); // add canonical instance in hope equals() is bit faster when can do a ==
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192 }
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diff changeset
193 for (int i = earliestRevision + 1; i < sequential.length; i++) {
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diff changeset
194 if (parents.contains(firstParent[i]) || parents.contains(secondParent[i])) {
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diff changeset
195 parents.add(sequential[i]); // to find next child
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diff changeset
196 result.add(sequential[i]);
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diff changeset
197 }
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198 }
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diff changeset
199 return result;
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diff changeset
200 }
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201
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
202 /**
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diff changeset
203 * @return revisions that have supplied revision as their immediate parent
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diff changeset
204 */
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parents:
diff changeset
205 public List<Nodeid> directChildren(Nodeid nid) {
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diff changeset
206 LinkedList<Nodeid> result = new LinkedList<Nodeid>();
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diff changeset
207 int x = Arrays.binarySearch(sorted, nid);
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diff changeset
208 assertSortedIndex(x);
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diff changeset
209 nid = sorted[x]; // canonical instance
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diff changeset
210 int start = sorted2natural[x];
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diff changeset
211 for (int i = start + 1; i < sequential.length; i++) {
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diff changeset
212 if (nid == firstParent[i] || nid == secondParent[i]) {
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diff changeset
213 result.add(sequential[i]);
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diff changeset
214 }
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parents:
diff changeset
215 }
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parents:
diff changeset
216 return result;
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parents:
diff changeset
217 }
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diff changeset
218
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parents:
diff changeset
219 /**
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parents:
diff changeset
220 * @param nid possibly parent node, shall be {@link #knownNode(Nodeid) known} in this revlog.
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diff changeset
221 * @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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diff changeset
222 */
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parents:
diff changeset
223 public boolean hasChildren(Nodeid nid) {
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diff changeset
224 int x = Arrays.binarySearch(sorted, nid);
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diff changeset
225 assertSortedIndex(x);
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diff changeset
226 int i = sorted2natural[x];
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diff changeset
227 assert firstParent.length == secondParent.length; // just in case later I implement sparse array for secondParent
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diff changeset
228 assert firstParent.length == sequential.length;
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parents:
diff changeset
229 // to use == instead of equals, take the same Nodeid instance we used to fill all the arrays.
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diff changeset
230 final Nodeid canonicalNode = sequential[i];
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231 i++; // no need to check node itself. child nodes may appear in sequential only after revision in question
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232 for (; i < sequential.length; i++) {
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233 // TODO [post 1.0] likely, not very effective.
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234 // May want to optimize it with another (Tree|Hash)Set, created on demand on first use,
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235 // however, need to be careful with memory usage
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236 if (firstParent[i] == canonicalNode || secondParent[i] == canonicalNode) {
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237 return true;
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238 }
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239 }
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240 return false;
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241 }
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242 }