Mercurial > hg4j

annotate src/org/tmatesoft/hg/internal/FileRevisionHistoryChunk.java @ 598:d29d9dc6c128

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Utilize the fact nodeids are very different and are read anyway to speed up reverse lookup
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Fri, 03 May 2013 15:19:18 +0200
parents 43cfa08ff3fd
children b4948b159ab1
rev   line source
596
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1 /*
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2 * Copyright (c) 2013 TMate Software Ltd
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3 *
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4 * This program is free software; you can redistribute it and/or modify
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5 * it under the terms of the GNU General Public License as published by
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6 * the Free Software Foundation; version 2 of the License.
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7 *
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8 * This program is distributed in the hope that it will be useful,
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9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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11 * GNU General Public License for more details.
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12 *
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13 * For information on how to redistribute this software under
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14 * the terms of a license other than GNU General Public License
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15 * contact TMate Software at support@hg4j.com
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16 */
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17 package org.tmatesoft.hg.internal;
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18
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19 import static org.tmatesoft.hg.core.HgIterateDirection.OldToNew;
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20 import static org.tmatesoft.hg.repo.HgRepository.BAD_REVISION;
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21 import static org.tmatesoft.hg.repo.HgRepository.NO_REVISION;
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22
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23 import java.util.Arrays;
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24 import java.util.BitSet;
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25 import java.util.LinkedList;
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26
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27 import org.tmatesoft.hg.core.HgIterateDirection;
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28 import org.tmatesoft.hg.core.Nodeid;
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29 import org.tmatesoft.hg.repo.HgDataFile;
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30 import org.tmatesoft.hg.repo.HgRepository;
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31
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32 /**
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33 * Piece of file history, identified by path, limited to file revisions from range [chop..init] of changesets,
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34 * can be linked to another piece.
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35 *
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36 * @author Artem Tikhomirov
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37 * @author TMate Software Ltd.
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38 */
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39 public final class FileRevisionHistoryChunk {
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40 private final HgDataFile df;
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41 // change ancestry, sequence of file revisions
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42 private IntVector fileRevsToVisit;
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43 // parent pairs of complete file history
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44 private IntVector fileParentRevs;
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45 // map file revision to changelog revision (sparse array, only file revisions to visit are set)
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46 private int[] file2changelog;
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47 private int originChangelogRev = BAD_REVISION, originFileRev = BAD_REVISION;
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48 private int csetRangeStart = NO_REVISION, csetRangeEnd = BAD_REVISION;
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49
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50
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51 public FileRevisionHistoryChunk(HgDataFile file) {
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52 df = file;
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53 }
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54
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55 /**
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56 * @return file at this specific chunk of history (i.e. its path may be different from the paths of other chunks)
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57 */
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58 public HgDataFile getFile() {
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59 return df;
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60 }
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61
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62 /**
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63 * @return changeset this file history chunk was chopped at, or {@link HgRepository#NO_REVISION} if none specified
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64 */
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65 public int getStartChangeset() {
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66 return csetRangeStart;
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67 }
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68
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69 /**
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70 * @return changeset this file history chunk ends at
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71 */
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72 public int getEndChangeset() {
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73 return csetRangeEnd;
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74 }
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75
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76 public void init(int changelogRevisionIndex) {
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77 csetRangeEnd = changelogRevisionIndex;
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78 // XXX df.indexWalk(0, fileRevIndex, ) might be more effective
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79 Nodeid fileRev = df.getRepo().getManifest().getFileRevision(changelogRevisionIndex, df.getPath());
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80 int fileRevIndex = df.getRevisionIndex(fileRev);
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81 int[] fileRevParents = new int[2];
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82 fileParentRevs = new IntVector((fileRevIndex+1) * 2, 0);
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83 fileParentRevs.add(NO_REVISION, NO_REVISION); // parents of fileRevIndex == 0
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84 for (int i = 1; i <= fileRevIndex; i++) {
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85 df.parents(i, fileRevParents, null, null);
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86 fileParentRevs.add(fileRevParents[0], fileRevParents[1]);
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87 }
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88 // fileRevsToVisit keep file change ancestry from new to old
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89 fileRevsToVisit = new IntVector(fileRevIndex + 1, 0);
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90 // keep map of file revision to changelog revision
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91 file2changelog = new int[fileRevIndex+1];
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92 // only elements worth visit would get mapped, so there would be unfilled areas in the file2changelog,
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93 // prevent from error (make it explicit) by bad value
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94 Arrays.fill(file2changelog, BAD_REVISION);
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95 LinkedList<Integer> queue = new LinkedList<Integer>();
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96 BitSet seen = new BitSet(fileRevIndex + 1);
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97 queue.add(fileRevIndex);
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98 do {
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99 int x = queue.removeFirst();
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100 if (seen.get(x)) {
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101 continue;
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102 }
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103 seen.set(x);
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104 fileRevsToVisit.add(x);
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105 file2changelog[x] = df.getChangesetRevisionIndex(x);
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106 int p1 = fileParentRevs.get(2*x);
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107 int p2 = fileParentRevs.get(2*x + 1);
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108 if (p1 != NO_REVISION) {
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109 queue.addLast(p1);
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110 }
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111 if (p2 != NO_REVISION) {
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112 queue.addLast(p2);
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113 }
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114 } while (!queue.isEmpty());
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115 // make sure no child is processed before we handled all (grand-)parents of the element
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116 fileRevsToVisit.sort(false);
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117 }
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118
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119 public void linkTo(FileRevisionHistoryChunk target) {
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120 // assume that target.init() has been called already
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121 if (target == null) {
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122 return;
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123 }
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124 target.originFileRev = fileRevsToVisit.get(0); // files to visit are new to old
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125 target.originChangelogRev = changeset(target.originFileRev);
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126 }
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127
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128 /**
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129 * Mark revision closest(ceil) to specified as the very first one (no parents)
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130 */
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131 public void chopAtChangeset(int firstChangelogRevOfInterest) {
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132 csetRangeStart = firstChangelogRevOfInterest;
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133 if (firstChangelogRevOfInterest == 0) {
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134 return; // nothing to do
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135 }
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136 int i = 0, x = fileRevsToVisit.size(), fileRev = BAD_REVISION;
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137 // fileRevsToVisit is new to old, greater numbers to smaller
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138 while (i < x && changeset(fileRev = fileRevsToVisit.get(i)) >= firstChangelogRevOfInterest) {
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139 i++;
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140 }
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141 assert fileRev != BAD_REVISION; // there's at least 1 revision in fileRevsToVisit
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142 if (i == x && changeset(fileRev) != firstChangelogRevOfInterest) {
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143 assert false : "Requested changeset shall belong to the chunk";
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144 return;
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145 }
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146 fileRevsToVisit.trimTo(i); // no need to iterate more
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147 // pretend fileRev got no parents
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148 fileParentRevs.set(fileRev * 2, NO_REVISION);
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149 fileParentRevs.set(fileRev, NO_REVISION);
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150 }
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151
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152 public int[] fileRevisions(HgIterateDirection iterateOrder) {
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153 // fileRevsToVisit is { r10, r7, r6, r5, r0 }, new to old
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154 int[] rv = fileRevsToVisit.toArray();
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155 if (iterateOrder == OldToNew) {
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156 // reverse return value
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157 for (int a = 0, b = rv.length-1; a < b; a++, b--) {
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158 int t = rv[b];
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159 rv[b] = rv[a];
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160 rv[a] = t;
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161 }
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162 }
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163 return rv;
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164 }
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165
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166 public int changeset(int fileRevIndex) {
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167 return file2changelog[fileRevIndex];
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168 }
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169
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170 public void fillFileParents(int fileRevIndex, int[] fileParents) {
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171 if (fileRevIndex == 0 && originFileRev != BAD_REVISION) {
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172 // this chunk continues another file
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173 assert originFileRev != NO_REVISION;
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174 fileParents[0] = originFileRev;
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175 fileParents[1] = NO_REVISION;
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176 return;
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177 }
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178 fileParents[0] = fileParentRevs.get(fileRevIndex * 2);
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179 fileParents[1] = fileParentRevs.get(fileRevIndex * 2 + 1);
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180 }
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181
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182 public void fillCsetParents(int fileRevIndex, int[] csetParents) {
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183 if (fileRevIndex == 0 && originFileRev != BAD_REVISION) {
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184 assert originFileRev != NO_REVISION;
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185 csetParents[0] = originChangelogRev;
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186 csetParents[1] = NO_REVISION; // I wonder if possible to start a copy with two parents?
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187 return;
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188 }
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189 int fp1 = fileParentRevs.get(fileRevIndex * 2);
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190 int fp2 = fileParentRevs.get(fileRevIndex * 2 + 1);
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191 csetParents[0] = fp1 == NO_REVISION ? NO_REVISION : changeset(fp1);
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192 csetParents[1] = fp2 == NO_REVISION ? NO_REVISION : changeset(fp2);
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193 }
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194 }