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annotate src/org/tmatesoft/hg/repo/HgBranches.java @ 241:d3ab16739736

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Some javadoc
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Thu, 23 Jun 2011 15:16:34 +0200
parents 883300108179
children 4b661efb9374
rev   line source
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1 /*
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2 * Copyright (c) 2011 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 java.io.BufferedReader;
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20 import java.io.File;
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21 import java.io.FileReader;
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22 import java.io.IOException;
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23 import java.util.ArrayList;
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24 import java.util.Arrays;
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25 import java.util.Collections;
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26 import java.util.HashMap;
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27 import java.util.HashSet;
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28 import java.util.LinkedHashSet;
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29 import java.util.LinkedList;
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30 import java.util.List;
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31 import java.util.Map;
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32 import java.util.TreeMap;
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33 import java.util.regex.Pattern;
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35 import org.tmatesoft.hg.core.Nodeid;
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36 import org.tmatesoft.hg.repo.HgChangelog.RawChangeset;
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37 import org.tmatesoft.hg.util.ProgressSupport;
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38
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39 /**
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40 *
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41 * @author Artem Tikhomirov
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42 * @author TMate Software Ltd.
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43 */
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44 public class HgBranches {
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45
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46 private final Map<String, BranchInfo> branches = new TreeMap<String, BranchInfo>();
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47 private final HgRepository repo;
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48
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49 HgBranches(HgRepository hgRepo) {
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50 repo = hgRepo;
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51 }
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52
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53 private int readCache() {
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54 File branchheadsCache = new File(repo.getRepositoryRoot(), "branchheads.cache");
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55 int lastInCache = -1;
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56 if (!branchheadsCache.canRead()) {
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57 return lastInCache;
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58 }
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59 BufferedReader br = null;
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60 final Pattern spacePattern = Pattern.compile(" ");
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61 try {
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62 br = new BufferedReader(new FileReader(branchheadsCache));
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63 String line = br.readLine();
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64 if (line == null || line.trim().length() == 0) {
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65 return lastInCache;
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66 }
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67 String[] cacheIdentity = spacePattern.split(line.trim());
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68 lastInCache = Integer.parseInt(cacheIdentity[1]);
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69 // XXX may want to check if nodeid of cset from repo.getChangelog() of lastInCache index match cacheIdentity[0]
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70 //
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71 while ((line = br.readLine()) != null) {
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72 String[] elements = line.trim().split(" ");
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73 if (elements.length < 2) {
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74 // bad entry
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75 continue;
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76 }
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77 Nodeid[] branchHeads = new Nodeid[elements.length - 1];
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78 for (int i = 0; i < elements.length - 1; i++) {
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79 branchHeads[i] = Nodeid.fromAscii(elements[i]);
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80 }
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81 // I assume split returns substrings of the original string, hence copy of a branch name
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82 String branchName = new String(elements[elements.length-1]);
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83 BranchInfo bi = new BranchInfo(branchName, branchHeads);
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84 branches.put(branchName, bi);
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85 }
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86 return lastInCache;
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87 } catch (IOException ex) {
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88 ex.printStackTrace(); // XXX log error, but otherwise do nothing
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89 } finally {
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90 if (br != null) {
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91 try {
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92 br.close();
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93 } catch (IOException ex) {
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94 ex.printStackTrace(); // ignore
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95 }
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96 }
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97 }
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98 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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99 }
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100
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101 void collect(final ProgressSupport ps) {
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102 branches.clear();
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103 ps.start(1 + repo.getChangelog().getRevisionCount() * 2);
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104 //
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105 int lastCached = readCache();
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106 /*
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107 * Next code was supposed to fill missing aspects of the BranchInfo, but is too slow
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108 *
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109 if (lastCached != -1 && lastCached <= repo.getChangelog().getLastRevision()) {
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110 LinkedList<BranchInfo> incompleteBranches = new LinkedList<HgBranches.BranchInfo>(branches.values());
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111 for (BranchInfo bi : incompleteBranches) {
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112 LinkedList<Nodeid> closedHeads = new LinkedList<Nodeid>();
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113 for (Nodeid h : bi.getHeads()) {
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114 if ("1".equals(repo.getChangelog().changeset(h).extras().get("close"))) {
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115 closedHeads.add(h);
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116 }
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117 }
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118 HashSet<Nodeid> earliest = new HashSet<Nodeid>(bi.getHeads());
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119 HashSet<Nodeid> visited = new HashSet<Nodeid>();
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120 ArrayList<Nodeid> parents = new ArrayList<Nodeid>(2);
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121 HashSet<Nodeid> candidate = new HashSet<Nodeid>();
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122 do {
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123 candidate.clear();
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124 for (Nodeid e : earliest) {
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125 parents.clear();
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126 if (pw.appendParentsOf(e, parents)) {
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127 // at least one parent
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128 Nodeid p1 = parents.get(0);
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129 if (p1 != null && !visited.contains(p1) && bi.getName().equals(repo.getChangelog().changeset(p1).branch())) {
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130 visited.add(p1);
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131 candidate.add(p1);
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132 }
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133 Nodeid p2 = parents.size() > 1 ? parents.get(1) : null;
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134 if (p2 != null && !visited.contains(p2) && bi.getName().equals(repo.getChangelog().changeset(p2).branch())) {
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135 visited.add(p2);
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136 candidate.add(p2);
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137 }
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138 }
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139 }
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140 if (!candidate.isEmpty()) {
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141 earliest.clear();
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142 earliest.addAll(candidate);
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143 }
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144 } while (!candidate.isEmpty());
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145 // earliest can't be empty, we've started with non-empty heads.
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146 Nodeid first = null;
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147 if (earliest.size() == 1) {
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148 first = earliest.iterator().next();
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149 } else {
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150 int earliestRevNum = Integer.MAX_VALUE;
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151 for (Nodeid e : earliest) {
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152 int x = repo.getChangelog().getLocalRevision(e);
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153 if (x < earliestRevNum) {
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154 earliestRevNum = x;
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155 first = e;
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156 }
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157 }
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158 }
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159 assert first != null;
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160 System.out.println("Updated branch " + bi.getName());
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161 branches.put(bi.getName(), new BranchInfo(bi.getName(), first, bi.getHeads().toArray(new Nodeid[0]), closedHeads.size() == bi.getHeads().size()));
220
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162 }
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163 }
236
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164 */
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165 if (lastCached != repo.getChangelog().getLastRevision()) {
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166 final HgChangelog.ParentWalker pw = repo.getChangelog().new ParentWalker();
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167 pw.init();
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168 ps.worked(repo.getChangelog().getRevisionCount());
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169 final HashMap<String, Nodeid> branchStart = new HashMap<String, Nodeid>();
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170 final HashMap<String, Nodeid> branchLastSeen = new HashMap<String, Nodeid>();
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171 final HashMap<String, List<Nodeid>> branchHeads = new HashMap<String, List<Nodeid>>();
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172 final HashSet<String> closedBranches = new HashSet<String>();
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173 HgChangelog.Inspector insp = new HgChangelog.Inspector() {
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174
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175 public void next(int revisionNumber, Nodeid nodeid, RawChangeset cset) {
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176 String branchName = cset.branch();
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177 if (!branchStart.containsKey(branchName)) {
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178 branchStart.put(branchName, nodeid);
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179 branchHeads.put(branchName, new LinkedList<Nodeid>());
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180 }
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181 branchLastSeen.remove(branchName);
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182 if ("1".equals(cset.extras().get("close"))) {
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183 branchHeads.get(branchName).add(nodeid); // XXX what if it still has children?
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184 closedBranches.add(branchName);
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185 } else {
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186 if (pw.hasChildren(nodeid)) {
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187 // children may be in another branch
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188 // and unless we later came across another element from this branch,
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189 // we need to record all these as valid heads
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190 // XXX what about next case: head1 with children in different branch, and head2 without children
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191 // head1 would get lost
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192 branchLastSeen.put(branchName, nodeid);
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193 } else {
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194 // no more children known for this node, it's (one of the) head of the branch
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195 branchHeads.get(branchName).add(nodeid);
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196 }
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197 }
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198 ps.worked(1);
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199 }
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200 };
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201 repo.getChangelog().range(lastCached == -1 ? 0 : lastCached+1, HgRepository.TIP, insp);
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202 for (String bn : branchLastSeen.keySet()) {
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203 branchHeads.get(bn).add(branchLastSeen.get(bn));
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204 }
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205 for (String bn : branchStart.keySet()) {
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206 BranchInfo bi = branches.get(bn);
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207 if (bi != null) {
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208 // although heads from cache shall not intersect with heads after lastCached,
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209 // use of LHS doesn't hurt (and makes sense e.g. if cache is not completely correct in my tests)
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210 LinkedHashSet<Nodeid> heads = new LinkedHashSet<Nodeid>(bi.getHeads());
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211 for (Nodeid oldHead : bi.getHeads()) {
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212 // XXX perhaps, need pw.canReach(Nodeid from, Collection<Nodeid> to)
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213 List<Nodeid> newChildren = pw.childrenOf(Collections.singletonList(oldHead));
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214 if (!newChildren.isEmpty()) {
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215 // likely not a head any longer,
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216 // check if any new head can be reached from old one, and, if yes,
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217 // do not consider that old head as head.
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218 for (Nodeid newHead : branchHeads.get(bn)) {
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219 if (newChildren.contains(newHead)) {
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220 heads.remove(oldHead);
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221 break;
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222 }
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223 }
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224 } // else - oldHead still head for the branch
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225 }
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226 heads.addAll(branchHeads.get(bn));
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227 bi = new BranchInfo(bn, bi.getStart(), heads.toArray(new Nodeid[0]), bi.isClosed() && closedBranches.contains(bn));
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228 } else {
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229 Nodeid[] heads = branchHeads.get(bn).toArray(new Nodeid[0]);
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230 bi = new BranchInfo(bn, branchStart.get(bn), heads, closedBranches.contains(bn));
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231 }
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232 branches.put(bn, bi);
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233 }
220
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234 }
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235 ps.done();
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236 }
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237
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238 public List<BranchInfo> getAllBranches() {
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239 return new LinkedList<BranchInfo>(branches.values());
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240
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241 }
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242
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243 public BranchInfo getBranch(String name) {
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244 return branches.get(name);
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245 }
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246
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247 public static class BranchInfo {
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248 private final String name;
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249 private final List<Nodeid> heads;
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250 private final boolean closed;
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251 private final Nodeid start;
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252
236
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253 // XXX in fact, few but not all branchHeads might be closed, and isClosed for whole branch is not
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254 // possible to determine.
220
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255 BranchInfo(String branchName, Nodeid first, Nodeid[] branchHeads, boolean isClosed) {
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256 name = branchName;
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257 start = first;
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258 heads = Collections.unmodifiableList(new ArrayList<Nodeid>(Arrays.asList(branchHeads)));
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259 closed = isClosed;
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260 }
236
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261
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262 // incomplete branch, there's not enough information at the time of creation. shall be replaced with
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263 // proper BI in #collect()
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264 BranchInfo(String branchName, Nodeid[] branchHeads) {
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265 this(branchName, Nodeid.NULL, branchHeads, false);
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266 }
220
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267
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268 public String getName() {
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269 return name;
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270 }
236
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271 /*public*/ boolean isClosed() {
220
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272 return closed;
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273 }
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274 public List<Nodeid> getHeads() {
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275 return heads;
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276 }
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277 // public Nodeid getTip() {
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278 // }
236
883300108179 Speed up branches calculation when cached branch information is available
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279 /*public*/ Nodeid getStart() {
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280 // first node where branch appears
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281 return start;
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282 }
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283 }
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284 }