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annotate src/org/tmatesoft/hg/repo/HgStatusCollector.java @ 196:e2115da4cf6a

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Pool objects to avoid memory polution with duplicates
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Mon, 18 Apr 2011 18:04:24 +0200
parents c9b305df0b89
children 3a7696fb457c
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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19 import static org.tmatesoft.hg.repo.HgRepository.BAD_REVISION;
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20 import static org.tmatesoft.hg.repo.HgRepository.TIP;
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21
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22 import java.util.Collection;
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23 import java.util.Collections;
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24 import java.util.LinkedHashMap;
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25 import java.util.LinkedList;
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26 import java.util.List;
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27 import java.util.Map;
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28 import java.util.SortedMap;
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29 import java.util.TreeMap;
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30 import java.util.TreeSet;
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31
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32 import org.tmatesoft.hg.core.HgDataStreamException;
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33 import org.tmatesoft.hg.core.Nodeid;
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34 import org.tmatesoft.hg.internal.Pool;
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35 import org.tmatesoft.hg.util.Path;
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36 import org.tmatesoft.hg.util.PathPool;
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37 import org.tmatesoft.hg.util.PathRewrite;
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39
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40 /**
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41 * RevisionWalker?
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42 *
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43 * @author Artem Tikhomirov
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44 * @author TMate Software Ltd.
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45 */
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46 public class HgStatusCollector {
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48 private final HgRepository repo;
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49 private final SortedMap<Integer, ManifestRevisionInspector> cache; // sparse array, in fact
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50 // with cpython repository, ~70 000 changes, complete Log (direct out, no reverse) output
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51 // no cache limit, no nodeids and fname caching - OOME on changeset 1035
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52 // no cache limit, but with cached nodeids and filenames - 1730+
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53 // cache limit 100 - 19+ minutes to process 10000, and still working (too long, stopped)
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54 private final int cacheMaxSize = 100; // do not keep too much manifest revisions
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55 private PathPool pathPool;
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56 private final Pool<Nodeid> cacheNodes;
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57 private final Pool<String> cacheFilenames; // XXX in fact, need to think if use of PathPool directly instead is better solution
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60 public HgStatusCollector(HgRepository hgRepo) {
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61 this.repo = hgRepo;
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62 cache = new TreeMap<Integer, ManifestRevisionInspector>();
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63 cacheNodes = new Pool<Nodeid>();
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64 cacheFilenames = new Pool<String>();
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65 ManifestRevisionInspector emptyFakeState = new ManifestRevisionInspector(null, null);
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66 emptyFakeState.begin(-1, null);
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67 emptyFakeState.end(-1); // FIXME HgRepo.TIP == -1 as well, need to distinguish fake "prior to first" revision from "the very last"
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68 cache.put(-1, emptyFakeState);
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69 }
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71 public HgRepository getRepo() {
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72 return repo;
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73 }
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75 private ManifestRevisionInspector get(int rev) {
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76 ManifestRevisionInspector i = cache.get(rev);
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77 if (i == null) {
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78 if (cache.size() > cacheMaxSize) {
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79 // assume usually we go from oldest to newest, hence remove oldest as most likely to be no longer necessary
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80 cache.remove(cache.firstKey());
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81 }
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82 i = new ManifestRevisionInspector(cacheNodes, cacheFilenames);
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83 cache.put(rev, i);
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84 repo.getManifest().walk(rev, rev, i);
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85 }
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86 return i;
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87 }
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89 /*package-local*/ ManifestRevisionInspector raw(int rev) {
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90 return get(rev);
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91 }
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92 /*package-local*/ PathPool getPathPool() {
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93 if (pathPool == null) {
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94 pathPool = new PathPool(new PathRewrite.Empty());
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95 }
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96 return pathPool;
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97 }
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99 /**
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100 * Allows sharing of a common path cache
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101 */
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102 public void setPathPool(PathPool pathPool) {
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103 this.pathPool = pathPool;
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104 }
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106
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107 // hg status --change <rev>
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108 public void change(int rev, HgStatusInspector inspector) {
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109 int[] parents = new int[2];
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110 repo.getChangelog().parents(rev, parents, null, null);
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111 walk(parents[0], rev, inspector);
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112 }
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113
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114 // I assume revision numbers are the same for changelog and manifest - here
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115 // user would like to pass changelog revision numbers, and I use them directly to walk manifest.
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116 // if this assumption is wrong, fix this (lookup manifest revisions from changeset).
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117 public void walk(int rev1, int rev2, HgStatusInspector inspector) {
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118 if (rev1 == rev2) {
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119 throw new IllegalArgumentException();
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120 }
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121 if (inspector == null) {
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122 throw new IllegalArgumentException();
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123 }
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124 if (inspector instanceof Record) {
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125 ((Record) inspector).init(rev1, rev2, this);
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126 }
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127 if (rev1 == TIP) {
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128 rev1 = repo.getManifest().getLastRevision();
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129 }
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130 if (rev2 == TIP) {
135
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131 rev2 = repo.getManifest().getLastRevision();
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132 }
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133 // in fact, rev1 and rev2 are often next (or close) to each other,
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134 // thus, we can optimize Manifest reads here (manifest.walk(rev1, rev2))
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135 ManifestRevisionInspector r1, r2 ;
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136 if (!cache.containsKey(rev1) && !cache.containsKey(rev2) && Math.abs(rev1 - rev2) < 5 /*subjective equivalent of 'close enough'*/) {
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137 int minRev = rev1 < rev2 ? rev1 : rev2;
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138 int maxRev = minRev == rev1 ? rev2 : rev1;
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139 if (minRev > 0) {
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140 minRev--; // expand range a bit
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141 // XXX perhaps, if revlog.baseRevision is cheap, shall expand minRev up to baseRevision
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142 // which gonna be read anyway
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143 }
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144
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145 repo.getManifest().walk(minRev, maxRev, new HgManifest.Inspector() {
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146 private ManifestRevisionInspector delegate;
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147
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148 public boolean begin(int revision, Nodeid nid) {
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149 cache.put(revision, delegate = new ManifestRevisionInspector(cacheNodes, cacheFilenames));
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150 delegate.begin(revision, nid);
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151 return true;
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152 }
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153
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154 public boolean next(Nodeid nid, String fname, String flags) {
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155 delegate.next(nid, fname, flags);
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156 return true;
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157 }
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158
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159 public boolean end(int revision) {
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160 delegate.end(revision);
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161 delegate = null;
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162 return true;
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163 }
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164 });
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165 }
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166 r1 = get(rev1);
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167 r2 = get(rev2);
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168
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169 PathPool pp = getPathPool();
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170
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171 TreeSet<String> r1Files = new TreeSet<String>(r1.files());
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172 for (String fname : r2.files()) {
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173 if (r1Files.remove(fname)) {
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174 Nodeid nidR1 = r1.nodeid(fname);
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175 Nodeid nidR2 = r2.nodeid(fname);
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176 String flagsR1 = r1.flags(fname);
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177 String flagsR2 = r2.flags(fname);
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178 if (nidR1.equals(nidR2) && ((flagsR2 == null && flagsR1 == null) || flagsR2.equals(flagsR1))) {
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179 inspector.clean(pp.path(fname));
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180 } else {
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181 inspector.modified(pp.path(fname));
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182 }
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183 } else {
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184 try {
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185 Path copyTarget = pp.path(fname);
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186 Path copyOrigin = getOriginIfCopy(repo, copyTarget, r1Files, rev1);
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187 if (copyOrigin != null) {
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188 inspector.copied(pp.path(copyOrigin) /*pipe through pool, just in case*/, copyTarget);
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189 } else {
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190 inspector.added(copyTarget);
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191 }
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192 } catch (HgDataStreamException ex) {
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193 ex.printStackTrace();
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194 // FIXME perhaps, shall record this exception to dedicated mediator and continue
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195 // for a single file not to be irresolvable obstacle for a status operation
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196 }
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197 }
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198 }
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199 for (String left : r1Files) {
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200 inspector.removed(pp.path(left));
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201 }
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202 }
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203
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204 public Record status(int rev1, int rev2) {
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205 Record rv = new Record();
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206 walk(rev1, rev2, rv);
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207 return rv;
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208 }
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209
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210 /*package-local*/static Path getOriginIfCopy(HgRepository hgRepo, Path fname, Collection<String> originals, int originalChangelogRevision) throws HgDataStreamException {
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211 HgDataFile df = hgRepo.getFileNode(fname);
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212 while (df.isCopy()) {
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213 Path original = df.getCopySourceName();
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214 if (originals.contains(original.toString())) {
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215 df = hgRepo.getFileNode(original);
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216 int changelogRevision = df.getChangesetLocalRevision(0);
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217 if (changelogRevision <= originalChangelogRevision) {
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218 // copy/rename source was known prior to rev1
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219 // (both r1Files.contains is true and original was created earlier than rev1)
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220 // without r1Files.contains changelogRevision <= rev1 won't suffice as the file
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221 // might get removed somewhere in between (changelogRevision < R < rev1)
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222 return original;
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223 }
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224 break; // copy/rename done later
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225 }
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226 df = hgRepo.getFileNode(original); // try more steps away
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227 }
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228 return null;
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229 }
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230
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231 // XXX for r1..r2 status, only modified, added, removed (and perhaps, clean) make sense
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232 // XXX Need to specify whether copy targets are in added or not (@see Inspector#copied above)
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233 public static class Record implements HgStatusInspector {
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234 private List<Path> modified, added, removed, clean, missing, unknown, ignored;
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235 private Map<Path, Path> copied;
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236
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237 private int startRev, endRev;
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238 private HgStatusCollector statusHelper;
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239
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240 // XXX StatusCollector may additionally initialize Record instance to speed lookup of changed file revisions
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241 // here I need access to ManifestRevisionInspector via #raw(). Perhaps, non-static class (to get
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242 // implicit reference to StatusCollector) may be better?
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243 // Since users may want to reuse Record instance we've once created (and initialized), we need to
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244 // ensure functionality is correct for each/any call (#walk checks instanceof Record and fixes it up)
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245 // Perhaps, distinct helper (sc.getRevisionHelper().nodeid(fname)) would be better, just not clear
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246 // how to supply [start..end] values there easily
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247 /*package-local*/void init(int startRevision, int endRevision, HgStatusCollector self) {
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248 startRev = startRevision;
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249 endRev = endRevision;
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250 statusHelper = self;
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251 }
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252
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253 public Nodeid nodeidBeforeChange(Path fname) {
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254 if (statusHelper == null || startRev == BAD_REVISION) {
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255 return null;
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256 }
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257 if ((modified == null || !modified.contains(fname)) && (removed == null || !removed.contains(fname))) {
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258 return null;
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259 }
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260 return statusHelper.raw(startRev).nodeid(fname.toString());
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261 }
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262 public Nodeid nodeidAfterChange(Path fname) {
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263 if (statusHelper == null || endRev == BAD_REVISION) {
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264 return null;
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265 }
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266 if ((modified == null || !modified.contains(fname)) && (added == null || !added.contains(fname))) {
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267 return null;
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268 }
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269 return statusHelper.raw(endRev).nodeid(fname.toString());
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270 }
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271
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272 public List<Path> getModified() {
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273 return proper(modified);
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274 }
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275
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276 public List<Path> getAdded() {
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277 return proper(added);
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278 }
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279
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280 public List<Path> getRemoved() {
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281 return proper(removed);
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282 }
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283
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284 public Map<Path,Path> getCopied() {
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285 if (copied == null) {
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286 return Collections.emptyMap();
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287 }
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288 return Collections.unmodifiableMap(copied);
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289 }
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290
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291 public List<Path> getClean() {
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292 return proper(clean);
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293 }
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294
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295 public List<Path> getMissing() {
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296 return proper(missing);
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297 }
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298
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299 public List<Path> getUnknown() {
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300 return proper(unknown);
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301 }
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302
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303 public List<Path> getIgnored() {
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304 return proper(ignored);
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305 }
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306
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307 private List<Path> proper(List<Path> l) {
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308 if (l == null) {
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309 return Collections.emptyList();
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310 }
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311 return Collections.unmodifiableList(l);
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312 }
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313
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314 //
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315 //
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316
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317 public void modified(Path fname) {
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318 modified = doAdd(modified, fname);
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319 }
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320
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321 public void added(Path fname) {
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322 added = doAdd(added, fname);
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323 }
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324
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325 public void copied(Path fnameOrigin, Path fnameAdded) {
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326 if (copied == null) {
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327 copied = new LinkedHashMap<Path, Path>();
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328 }
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329 added(fnameAdded);
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330 copied.put(fnameAdded, fnameOrigin);
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331 }
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332
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333 public void removed(Path fname) {
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334 removed = doAdd(removed, fname);
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335 }
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336
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337 public void clean(Path fname) {
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338 clean = doAdd(clean, fname);
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339 }
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340
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341 public void missing(Path fname) {
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342 missing = doAdd(missing, fname);
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343 }
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344
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345 public void unknown(Path fname) {
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346 unknown = doAdd(unknown, fname);
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347 }
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348
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349 public void ignored(Path fname) {
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350 ignored = doAdd(ignored, fname);
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351 }
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352
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353 private static List<Path> doAdd(List<Path> l, Path p) {
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354 if (l == null) {
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355 l = new LinkedList<Path>();
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356 }
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357 l.add(p);
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358 return l;
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359 }
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360 }
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361
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362 /*package-local*/ static final class ManifestRevisionInspector implements HgManifest.Inspector {
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363 private final TreeMap<String, Nodeid> idsMap;
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364 private final TreeMap<String, String> flagsMap;
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365 private final Pool<Nodeid> idsPool;
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366 private final Pool<String> namesPool;
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367
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368 // optional pools for effective management of nodeids and filenames (they are likely
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369 // to be duplicated among different manifest revisions
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370 public ManifestRevisionInspector(Pool<Nodeid> nodeidPool, Pool<String> filenamePool) {
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371 idsPool = nodeidPool;
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372 namesPool = filenamePool;
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373 idsMap = new TreeMap<String, Nodeid>();
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374 flagsMap = new TreeMap<String, String>();
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375 }
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376
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377 public Collection<String> files() {
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378 return idsMap.keySet();
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379 }
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380
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381 public Nodeid nodeid(String fname) {
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382 return idsMap.get(fname);
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383 }
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384
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385 public String flags(String fname) {
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386 return flagsMap.get(fname);
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387 }
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388
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389 //
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390
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391 public boolean next(Nodeid nid, String fname, String flags) {
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392 if (namesPool != null) {
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393 fname = namesPool.unify(fname);
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394 }
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395 if (idsPool != null) {
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396 nid = idsPool.unify(nid);
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397 }
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398 idsMap.put(fname, nid);
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399 flagsMap.put(fname, flags);
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400 return true;
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401 }
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402
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403 public boolean end(int revision) {
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404 // in fact, this class cares about single revision
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405 return false;
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406 }
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407
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408 public boolean begin(int revision, Nodeid nid) {
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409 return true;
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410 }
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411 }
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413 }