Mercurial > jhg

annotate src/org/tmatesoft/hg/repo/HgBranches.java @ 502:37d97854c6ad

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Respect changesets with no list of changed files, as discovered with Issue 41
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Mon, 29 Oct 2012 20:06:16 +0100
parents b3c16d1aede0
children 5c68567b3645
rev   line source
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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.util.LogFacility.Severity.Error;
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20 import static org.tmatesoft.hg.util.LogFacility.Severity.Warn;
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21
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22 import java.io.BufferedReader;
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23 import java.io.BufferedWriter;
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24 import java.io.File;
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25 import java.io.FileReader;
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26 import java.io.FileWriter;
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27 import java.io.IOException;
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28 import java.util.ArrayList;
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29 import java.util.Arrays;
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30 import java.util.Collections;
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31 import java.util.HashMap;
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32 import java.util.LinkedHashMap;
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33 import java.util.LinkedHashSet;
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34 import java.util.LinkedList;
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35 import java.util.List;
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36 import java.util.Map;
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37 import java.util.TreeMap;
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38 import java.util.regex.Pattern;
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40 import org.tmatesoft.hg.core.Nodeid;
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41 import org.tmatesoft.hg.internal.Experimental;
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42 import org.tmatesoft.hg.internal.Internals;
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43 import org.tmatesoft.hg.repo.HgChangelog.RawChangeset;
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44 import org.tmatesoft.hg.util.ProgressSupport;
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45
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46 /**
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47 *
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48 * @author Artem Tikhomirov
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49 * @author TMate Software Ltd.
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50 */
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51 public class HgBranches {
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52
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53 private final Map<String, BranchInfo> branches = new TreeMap<String, BranchInfo>();
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54 private final HgRepository repo;
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55 private final Internals internalRepo;
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56 private boolean isCacheActual = false;
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57
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58 HgBranches(Internals internals) {
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59 internalRepo = internals;
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60 repo = internals.getRepo(); // merely a cached value
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61 }
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62
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63 private int readCache() {
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64 File branchheadsCache = getCacheFile();
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65 int lastInCache = -1;
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66 if (!branchheadsCache.canRead()) {
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67 return lastInCache;
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68 }
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69 BufferedReader br = null;
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70 final Pattern spacePattern = Pattern.compile(" ");
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71 try {
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72 final LinkedHashMap<String, List<Nodeid>> branchHeads = new LinkedHashMap<String, List<Nodeid>>();
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73 br = new BufferedReader(new FileReader(branchheadsCache));
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74 String line = br.readLine();
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75 if (line == null || line.trim().length() == 0) {
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76 return lastInCache;
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77 }
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78 String[] cacheIdentity = spacePattern.split(line.trim());
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79 lastInCache = Integer.parseInt(cacheIdentity[1]);
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80 final int lastKnownRepoRevIndex = repo.getChangelog().getLastRevision();
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81 if (lastInCache > lastKnownRepoRevIndex || !repo.getChangelog().getRevision(lastKnownRepoRevIndex).equals(Nodeid.fromAscii(cacheIdentity[0]))) {
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82 // there are chances cache file got invalid entries due to e.g. rollback operation
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83 return -1;
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84 }
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85 while ((line = br.readLine()) != null) {
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86 String[] elements = spacePattern.split(line.trim());
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87 if (elements.length != 2) {
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88 // bad entry
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89 continue;
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90 }
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91 // I assume split returns substrings of the original string, hence copy of a branch name
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92 String branchName = new String(elements[elements.length-1]);
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93 List<Nodeid> heads = branchHeads.get(elements[1]);
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94 if (heads == null) {
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95 branchHeads.put(branchName, heads = new LinkedList<Nodeid>());
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96 }
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97 heads.add(Nodeid.fromAscii(elements[0]));
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98 }
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99 for (Map.Entry<String, List<Nodeid>> e : branchHeads.entrySet()) {
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100 Nodeid[] heads = e.getValue().toArray(new Nodeid[e.getValue().size()]);
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101 BranchInfo bi = new BranchInfo(e.getKey(), heads);
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102 branches.put(e.getKey(), bi);
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103 }
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104 return lastInCache;
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105 } catch (IOException ex) {
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106 // log error, but otherwise do nothing
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107 repo.getSessionContext().getLog().dump(getClass(), Warn, ex, null);
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108 // FALL THROUGH to return -1 indicating no cache information
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109 } catch (NumberFormatException ex) {
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110 repo.getSessionContext().getLog().dump(getClass(), Warn, ex, null);
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111 // FALL THROUGH
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112 } catch (HgInvalidControlFileException ex) {
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113 // shall not happen, thus log as error
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114 repo.getSessionContext().getLog().dump(getClass(), Error, ex, null);
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115 // FALL THROUGH
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116 } catch (HgInvalidRevisionException ex) {
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117 repo.getSessionContext().getLog().dump(getClass(), Error, ex, null);
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118 // FALL THROUGH
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119 } finally {
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120 if (br != null) {
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121 try {
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122 br.close();
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123 } catch (IOException ex) {
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124 repo.getSessionContext().getLog().dump(getClass(), Warn, ex, null); // ignore
236
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125 }
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126 }
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127 }
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128 return -1; // deliberately not lastInCache, to avoid anything but -1 when 1st line was read and there's error is in lines 2..end
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129 }
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130
366
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131 void collect(final ProgressSupport ps) throws HgInvalidControlFileException {
236
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132 branches.clear();
220
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133 ps.start(1 + repo.getChangelog().getRevisionCount() * 2);
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134 //
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135 int lastCached = readCache();
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136 isCacheActual = lastCached == repo.getChangelog().getLastRevision();
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137 if (!isCacheActual) {
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138 final HgParentChildMap<HgChangelog> pw = new HgParentChildMap<HgChangelog>(repo.getChangelog());
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139 pw.init();
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140 ps.worked(repo.getChangelog().getRevisionCount());
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141 // first revision branch found at
236
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142 final HashMap<String, Nodeid> branchStart = new HashMap<String, Nodeid>();
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143 // last revision seen for the branch
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144 final HashMap<String, Nodeid> branchLastSeen = new HashMap<String, Nodeid>();
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145 // revisions from the branch that have no children at all
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146 final HashMap<String, List<Nodeid>> branchHeads = new HashMap<String, List<Nodeid>>();
309
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147 // revisions that are immediate children of a node from a given branch
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148 // after iteration, there are some revisions left in this map (children of a branch last revision
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149 // that doesn't belong to the branch. No use of this now, perhaps can deduce isInactive (e.g.those
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150 // branches that have non-empty candidates are inactive if all their heads are roots for those left)
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151 final HashMap<String, List<Nodeid>> branchHeadCandidates = new HashMap<String, List<Nodeid>>();
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152 HgChangelog.Inspector insp = new HgChangelog.Inspector() {
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153
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154 public void next(int revisionNumber, Nodeid nodeid, RawChangeset cset) {
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155 String branchName = cset.branch();
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156 if (!branchStart.containsKey(branchName)) {
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157 branchStart.put(branchName, nodeid);
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158 branchHeads.put(branchName, new LinkedList<Nodeid>());
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159 branchHeadCandidates.put(branchName, new LinkedList<Nodeid>());
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160 } else {
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161 final List<Nodeid> headCandidates = branchHeadCandidates.get(branchName);
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162 if (headCandidates.remove(nodeid)) {
309
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163 // likely we don't need to keep parent anymore, as we found at least 1 child thereof to be at the same branch
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164 // however, it's possible the child we found is a result of an earlier fork, and revision in the
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165 // branchLastSeen is 'parallel' head, which needs to be kept
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166 Nodeid lastSeenInBranch = branchLastSeen.get(branchName);
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167 // check if current revision is on descendant line. Seems direct parents check is enough
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168 if (pw.safeFirstParent(nodeid).equals(lastSeenInBranch) || pw.safeSecondParent(nodeid).equals(lastSeenInBranch)) {
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169 branchLastSeen.remove(branchName);
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170 }
236
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171 }
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172 }
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173 List<Nodeid> immediateChildren = pw.directChildren(nodeid);
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174 if (immediateChildren.size() > 0) {
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175 // 1) children may be in another branch
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176 // and unless we later came across another element from this branch,
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177 // we need to record all these as potential heads
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178 //
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179 // 2) head1 with children in different branch, and head2 in this branch without children
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180 branchLastSeen.put(branchName, nodeid);
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181 branchHeadCandidates.get(branchName).addAll(immediateChildren);
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182 } else {
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183 // no more children known for this node, it's (one of the) head of the branch
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184 branchHeads.get(branchName).add(nodeid);
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185 }
236
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186 ps.worked(1);
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187 }
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188 };
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189 repo.getChangelog().range(lastCached == -1 ? 0 : lastCached+1, HgRepository.TIP, insp);
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190 // those last seen revisions from the branch that had no children from the same branch are heads.
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191 for (String bn : branchLastSeen.keySet()) {
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192 // these are inactive branches? - there were children, but not from the same branch?
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193 branchHeads.get(bn).add(branchLastSeen.get(bn));
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194 }
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195 for (String bn : branchStart.keySet()) {
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196 BranchInfo bi = branches.get(bn);
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197 if (bi != null) {
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198 // although heads from cache shall not intersect with heads after lastCached,
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199 // use of LHS doesn't hurt (and makes sense e.g. if cache is not completely correct in my tests)
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200 LinkedHashSet<Nodeid> heads = new LinkedHashSet<Nodeid>(bi.getHeads());
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201 for (Nodeid oldHead : bi.getHeads()) {
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202 // XXX perhaps, need pw.canReach(Nodeid from, Collection<Nodeid> to)
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203 List<Nodeid> newChildren = pw.childrenOf(Collections.singletonList(oldHead));
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204 if (!newChildren.isEmpty()) {
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205 // likely not a head any longer,
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206 // check if any new head can be reached from old one, and, if yes,
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207 // do not consider that old head as head.
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208 for (Nodeid newHead : branchHeads.get(bn)) {
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209 if (newChildren.contains(newHead)) {
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210 heads.remove(oldHead);
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211 break;
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212 }
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213 }
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214 } // else - oldHead still head for the branch
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215 }
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216 heads.addAll(branchHeads.get(bn));
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217 bi = new BranchInfo(bn, bi.getStart(), heads.toArray(new Nodeid[0]));
236
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218 } else {
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219 Nodeid[] heads = branchHeads.get(bn).toArray(new Nodeid[0]);
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220 bi = new BranchInfo(bn, branchStart.get(bn), heads);
236
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221 }
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222 branches.put(bn, bi);
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223 }
220
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224 }
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225 final HgChangelog clog = repo.getChangelog();
433
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226 final HgRevisionMap<HgChangelog> rmap = new HgRevisionMap<HgChangelog>(clog).init();
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227 for (BranchInfo bi : branches.values()) {
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228 bi.validate(clog, rmap);
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229 }
220
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230 ps.done();
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231 }
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232
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233 public List<BranchInfo> getAllBranches() {
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234 return new LinkedList<BranchInfo>(branches.values());
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235
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236 }
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237
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238 public BranchInfo getBranch(String name) {
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239 return branches.get(name);
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240 }
244
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241
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242 /**
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243 * Writes down information about repository branches in a format Mercurial native client can understand.
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244 * Cache file gets overwritten only if it is out of date (i.e. misses some branch information)
354
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245 * @throws IOException if write to cache file failed
423
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246 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em>
244
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247 */
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248 @Experimental(reason="Usage of cache isn't supposed to be public knowledge")
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249 public void writeCache() throws IOException, HgRuntimeException {
244
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250 if (isCacheActual) {
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251 return;
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252 }
354
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253 File branchheadsCache = getCacheFile();
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254 if (!branchheadsCache.exists()) {
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255 branchheadsCache.getParentFile().mkdirs(); // just in case cache/ doesn't exist jet
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256 branchheadsCache.createNewFile();
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257 }
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258 if (!branchheadsCache.canWrite()) {
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259 return;
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260 }
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261 final int lastRev = repo.getChangelog().getLastRevision();
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262 final Nodeid lastNid = repo.getChangelog().getRevision(lastRev);
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263 BufferedWriter bw = new BufferedWriter(new FileWriter(branchheadsCache));
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264 bw.write(lastNid.toString());
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265 bw.write((int) ' ');
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266 bw.write(Integer.toString(lastRev));
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267 bw.write("\n");
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268 for (BranchInfo bi : branches.values()) {
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269 for (Nodeid nid : bi.getHeads()) {
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270 bw.write(nid.toString());
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271 bw.write((int) ' ');
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272 bw.write(bi.getName());
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273 bw.write("\n");
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274 }
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275 }
354
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276 bw.close();
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277 }
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278
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279 private File getCacheFile() {
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280 // prior to 1.8 used to be .hg/branchheads.cache
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281 return internalRepo.getFileFromRepoDir("cache/branchheads");
244
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282 }
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283
220
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284 public static class BranchInfo {
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285 private final String name;
308
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286 private List<Nodeid> heads;
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287 private boolean closed;
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288 private final Nodeid start;
315
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289 private List<Nodeid> closedHeads; // subset of heads, those that bear 'closed' flag, or null if closed == true
220
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290
236
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291 // XXX in fact, few but not all branchHeads might be closed, and isClosed for whole branch is not
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292 // possible to determine.
308
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293 BranchInfo(String branchName, Nodeid first, Nodeid[] branchHeads) {
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294 name = branchName;
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295 start = first;
308
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296 heads = Arrays.asList(branchHeads);
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297 }
236
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298
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299 // incomplete branch, there's not enough information at the time of creation. shall be replaced with
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300 // proper BI in #collect()
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301 BranchInfo(String branchName, Nodeid[] branchHeads) {
308
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302 this(branchName, Nodeid.NULL, branchHeads);
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303 }
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304
433
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305 void validate(HgChangelog clog, HgRevisionMap<HgChangelog> rmap) throws HgInvalidControlFileException {
308
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306 int[] localCset = new int[heads.size()];
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307 int i = 0;
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308 for (Nodeid h : heads) {
367
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309 localCset[i++] = rmap.revisionIndex(h);
308
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310 }
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311 // [0] tipmost, [1] tipmost open
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312 final Nodeid[] tipmost = new Nodeid[] {null, null};
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313 final boolean[] allClosed = new boolean[] { true };
315
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314 final ArrayList<Nodeid> _closedHeads = new ArrayList<Nodeid>(heads.size());
308
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315 clog.range(new HgChangelog.Inspector() {
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316
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317 public void next(int revisionNumber, Nodeid nodeid, RawChangeset cset) {
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318 assert heads.contains(nodeid);
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319 tipmost[0] = nodeid;
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320 if (!"1".equals(cset.extras().get("close"))) {
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321 tipmost[1] = nodeid;
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322 allClosed[0] = false;
315
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323 } else {
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324 _closedHeads.add(nodeid);
308
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325 }
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326 }
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327 }, localCset);
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328 closed = allClosed[0];
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329 Nodeid[] outcome = new Nodeid[localCset.length];
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330 i = 0;
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331 if (!closed && tipmost[1] != null) {
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332 outcome[i++] = tipmost[1];
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333 if (i < outcome.length && !tipmost[0].equals(tipmost[1])) {
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334 outcome[i++] = tipmost[0];
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335 }
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336 } else {
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337 outcome[i++] = tipmost[0];
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338 }
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339 for (Nodeid h : heads) {
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340 if (!h.equals(tipmost[0]) && !h.equals(tipmost[1])) {
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341 outcome[i++] = h;
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342 }
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343 }
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344 heads = Arrays.asList(outcome);
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345 if (closed) {
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346 // no need
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347 closedHeads = null;
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348 } else {
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349 _closedHeads.trimToSize();
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350 closedHeads = _closedHeads;
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351 }
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352 }
220
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353
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354 public String getName() {
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355 return name;
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356 }
308
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357 /**
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358 * @return <code>true</code> if all heads of this branch are marked as closed
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359 */
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360 public boolean isClosed() {
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361 return closed;
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362 }
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363
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364 /**
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365 * @return all heads for the branch, both open and closed, tip-most head first
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366 */
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367 public List<Nodeid> getHeads() {
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368 return heads;
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369 }
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370
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371 /**
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372 *
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373 * @param head one of revision from {@link #getHeads() heads} of this branch
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374 * @return true if this particular head is closed
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375 * @throws IllegalArgumentException if argument is not from {@link #getHeads() heads} of this branch
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376 */
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377 public boolean isClosed(Nodeid head) {
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378 if (!heads.contains(head)) {
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379 throw new IllegalArgumentException(String.format("Revision %s does not belong to heads of %s branch", head, name), null);
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380 }
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381 if (closed) {
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382 return true;
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383 }
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384 return closedHeads.contains(head);
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385 }
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386 // public Nodeid getTip() {
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387 // }
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388 /*public*/ Nodeid getStart() {
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389 // first node where branch appears
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390 return start;
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391 }
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392 }
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393 }