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annotate src/org/tmatesoft/hg/repo/HgStatusCollector.java @ 330:9747a786a34d

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Patch merging algorithm complete trial
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 25 Oct 2011 03:30:02 +0200
parents 678e326fd27c
children 5f9073eabf06
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.TreeSet;
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29
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30 import org.tmatesoft.hg.core.HgBadStateException;
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31 import org.tmatesoft.hg.core.HgDataStreamException;
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32 import org.tmatesoft.hg.core.Nodeid;
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33 import org.tmatesoft.hg.internal.IntMap;
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34 import org.tmatesoft.hg.internal.ManifestRevision;
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35 import org.tmatesoft.hg.internal.Pool;
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36 import org.tmatesoft.hg.util.Path;
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37 import org.tmatesoft.hg.util.PathPool;
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38 import org.tmatesoft.hg.util.PathRewrite;
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40
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41 /**
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42 * RevisionWalker?
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43 *
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44 * @author Artem Tikhomirov
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45 * @author TMate Software Ltd.
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46 */
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47 public class HgStatusCollector {
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49 private final HgRepository repo;
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50 private final IntMap<ManifestRevision> cache; // sparse array, in fact
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51 // with cpython repository, ~70 000 changes, complete Log (direct out, no reverse) output
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52 // no cache limit, no nodeids and fname caching - OOME on changeset 1035
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53 // no cache limit, but with cached nodeids and filenames - 1730+
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54 // cache limit 100 - 19+ minutes to process 10000, and still working (too long, stopped)
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55 private final int cacheMaxSize = 50; // do not keep too much manifest revisions
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56 private PathPool pathPool;
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57 private final Pool<Nodeid> cacheNodes;
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58 private final Pool<Path> cacheFilenames;
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59 private final ManifestRevision emptyFakeState;
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60 private Path.Matcher scope = new Path.Matcher.Any();
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63 public HgStatusCollector(HgRepository hgRepo) {
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64 this.repo = hgRepo;
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65 cache = new IntMap<ManifestRevision>(cacheMaxSize);
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66 cacheNodes = new Pool<Nodeid>();
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67 cacheFilenames = new Pool<Path>();
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69 emptyFakeState = createEmptyManifestRevision();
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70 }
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72 public HgRepository getRepo() {
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73 return repo;
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74 }
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76 private ManifestRevision get(int rev) {
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77 ManifestRevision i = cache.get(rev);
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78 if (i == null) {
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79 if (rev == -1) {
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80 return emptyFakeState;
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81 }
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82 ensureCacheSize();
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83 i = new ManifestRevision(cacheNodes, cacheFilenames);
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84 cache.put(rev, i);
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85 repo.getManifest().walk(rev, rev, i);
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86 }
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87 return i;
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88 }
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90 private boolean cached(int revision) {
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91 return cache.containsKey(revision) || revision == -1;
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92 }
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94 private void ensureCacheSize() {
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95 if (cache.size() > cacheMaxSize) {
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96 // assume usually we go from oldest to newest, hence remove oldest as most likely to be no longer necessary
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97 cache.removeFromStart(cache.size() - cacheMaxSize + 1 /* room for new element */);
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98 }
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99 }
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101 private void initCacheRange(int minRev, int maxRev) {
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102 ensureCacheSize();
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103 // In fact, walk(minRev, maxRev) doesn't imply
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104 // there would be maxRev-minRev+1 revisions visited. For example,
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105 // check cpython repo with 'hg log -r 22418:22420 --debug' and admire
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106 // manifest revisions 66650, 21683, 21684. Thus, innocent walk(22418,22420) results in 40k+ revisions and OOME
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107 // Instead, be explicit of what revisions are of interest
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108 assert minRev <= maxRev;
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109 int[] revisionsToCollect = new int[maxRev - minRev + 1];
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110 for (int x = minRev, i = 0; x <= maxRev; i++, x++) {
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111 revisionsToCollect[i] = x;
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112 }
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113 repo.getManifest().walk(new HgManifest.Inspector2() {
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114 private ManifestRevision delegate;
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115 private boolean cacheHit; // range may include revisions we already know about, do not re-create them
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116
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117 public boolean begin(int manifestRevision, Nodeid nid, int changelogRevision) {
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118 assert delegate == null;
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119 if (cache.containsKey(changelogRevision)) { // don't need to check emptyFakeState hit as revision never -1 here
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120 cacheHit = true;
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121 } else {
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122 cache.put(changelogRevision, delegate = new ManifestRevision(cacheNodes, cacheFilenames));
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123 // cache may grow bigger than max size here, but it's ok as present simplistic cache clearing mechanism may
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124 // otherwise remove entries we just added
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125 delegate.begin(manifestRevision, nid, changelogRevision);
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126 cacheHit = false;
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127 }
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128 return true;
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129 }
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130
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131 public boolean next(Nodeid nid, String fname, String flags) {
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132 throw new HgBadStateException(HgManifest.Inspector2.class.getName());
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133 }
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134
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135 public boolean next(Nodeid nid, Path fname, HgManifest.Flags flags) {
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136 if (!cacheHit) {
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137 delegate.next(nid, fname, flags);
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138 }
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139 return true;
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140 }
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141
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142 public boolean end(int revision) {
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143 if (!cacheHit) {
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144 delegate.end(revision);
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145 }
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146 cacheHit = false;
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147 delegate = null;
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148 return true;
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149 }
302
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150 }, revisionsToCollect);
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151 }
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152
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153 /*package-local*/ static ManifestRevision createEmptyManifestRevision() {
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154 ManifestRevision fakeEmptyRev = new ManifestRevision(null, null);
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155 fakeEmptyRev.begin(-1, null, -1);
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156 fakeEmptyRev.end(-1);
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157 return fakeEmptyRev;
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158 }
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159
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160 /*package-local*/ ManifestRevision raw(int rev) {
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161 return get(rev);
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162 }
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163 /*package-local*/ PathPool getPathPool() {
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164 if (pathPool == null) {
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165 pathPool = new PathPool(new PathRewrite.Empty());
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166 }
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167 return pathPool;
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168 }
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169
142
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170 /**
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171 * Allows sharing of a common path cache
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172 */
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173 public void setPathPool(PathPool pathPool) {
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174 this.pathPool = pathPool;
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175 }
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176
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177 /**
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178 * Limit activity of the collector to certain sub-tree of the repository.
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179 * @param scopeMatcher tells whether collector shall report specific path, can be <code>null</code>
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180 */
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181 public void setScope(Path.Matcher scopeMatcher) {
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182 // do not assign null, ever
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183 scope = scopeMatcher == null ? new Path.Matcher.Any() : scopeMatcher;
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184 }
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185
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186 // hg status --change <rev>
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187 public void change(int rev, HgStatusInspector inspector) {
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188 int[] parents = new int[2];
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189 repo.getChangelog().parents(rev, parents, null, null);
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190 walk(parents[0], rev, inspector);
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191 }
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192
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193 // rev1 and rev2 are changelog revision numbers, argument order matters.
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194 // Either rev1 or rev2 may be -1 to indicate comparison to empty repository (XXX this is due to use of
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195 // parents in #change(), I believe. Perhaps, need a constant for this? Otherwise this hidden knowledge gets
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196 // exposed to e.g. Record
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197 public void walk(int rev1, int rev2, HgStatusInspector inspector) {
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198 if (rev1 == rev2) {
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199 throw new IllegalArgumentException();
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200 }
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201 if (inspector == null) {
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202 throw new IllegalArgumentException();
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203 }
218
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204 final int lastManifestRevision = repo.getChangelog().getLastRevision();
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205 if (rev1 == TIP) {
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206 rev1 = lastManifestRevision;
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207 }
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208 if (rev2 == TIP) {
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209 rev2 = lastManifestRevision;
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210 }
282
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211 if (inspector instanceof Record) {
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212 ((Record) inspector).init(rev1, rev2, this);
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213 }
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214 // in fact, rev1 and rev2 are often next (or close) to each other,
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215 // thus, we can optimize Manifest reads here (manifest.walk(rev1, rev2))
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216 ManifestRevision r1, r2 ;
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217 boolean need1 = !cached(rev1), need2 = !cached(rev2);
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218 if (need1 || need2) {
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219 int minRev, maxRev;
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220 if (need1 && need2 && Math.abs(rev1 - rev2) < 5 /*subjective equivalent of 'close enough'*/) {
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221 minRev = rev1 < rev2 ? rev1 : rev2;
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222 maxRev = minRev == rev1 ? rev2 : rev1;
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223 if (minRev > 0) {
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224 minRev--; // expand range a bit
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225 }
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226 initCacheRange(minRev, maxRev);
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227 need1 = need2 = false;
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228 }
197
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229 // either both unknown and far from each other, or just one of them.
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230 // read with neighbors to save potential subsequent calls for neighboring elements
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231 // XXX perhaps, if revlog.baseRevision is cheap, shall expand minRev up to baseRevision
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232 // which going to be read anyway
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233 if (need1) {
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234 minRev = rev1;
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235 maxRev = rev1 < lastManifestRevision-5 ? rev1+5 : lastManifestRevision;
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236 initCacheRange(minRev, maxRev);
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237 }
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238 if (need2) {
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239 minRev = rev2;
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240 maxRev = rev2 < lastManifestRevision-5 ? rev2+5 : lastManifestRevision;
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241 initCacheRange(minRev, maxRev);
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242 }
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243 }
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244 r1 = get(rev1);
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245 r2 = get(rev2);
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246
285
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247 TreeSet<Path> r1Files = new TreeSet<Path>(r1.files());
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248 for (Path r2fname : r2.files()) {
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249 if (!scope.accept(r2fname)) {
226
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250 continue;
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251 }
285
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252 if (r1Files.remove(r2fname)) {
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253 Nodeid nidR1 = r1.nodeid(r2fname);
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254 Nodeid nidR2 = r2.nodeid(r2fname);
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255 HgManifest.Flags flagsR1 = r1.flags(r2fname);
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256 HgManifest.Flags flagsR2 = r2.flags(r2fname);
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257 if (nidR1.equals(nidR2) && flagsR2 == flagsR1) {
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258 inspector.clean(r2fname);
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259 } else {
285
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260 inspector.modified(r2fname);
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261 }
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262 } else {
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263 try {
285
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264 Path copyTarget = r2fname;
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265 Path copyOrigin = getOriginIfCopy(repo, copyTarget, r1Files, rev1);
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266 if (copyOrigin != null) {
285
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267 inspector.copied(getPathPool().path(copyOrigin) /*pipe through pool, just in case*/, copyTarget);
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268 } else {
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269 inspector.added(copyTarget);
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270 }
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271 } catch (HgDataStreamException ex) {
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272 ex.printStackTrace();
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273 // FIXME perhaps, shall record this exception to dedicated mediator and continue
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274 // for a single file not to be irresolvable obstacle for a status operation
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275 }
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276 }
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277 }
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278 for (Path r1fname : r1Files) {
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279 if (scope.accept(r1fname)) {
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280 inspector.removed(r1fname);
226
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281 }
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282 }
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283 }
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284
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285 public Record status(int rev1, int rev2) {
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286 Record rv = new Record();
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287 walk(rev1, rev2, rv);
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288 return rv;
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289 }
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290
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291 /*package-local*/static Path getOriginIfCopy(HgRepository hgRepo, Path fname, Collection<Path> originals, int originalChangelogRevision) throws HgDataStreamException {
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292 HgDataFile df = hgRepo.getFileNode(fname);
320
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293 if (!df.exists()) {
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294 String msg = String.format("Didn't find file '%s' in the repo. Perhaps, bad storage name conversion?", fname);
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295 throw new HgDataStreamException(fname, msg, null).setRevisionNumber(originalChangelogRevision);
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296 }
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297 while (df.isCopy()) {
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298 Path original = df.getCopySourceName();
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299 if (originals.contains(original)) {
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300 df = hgRepo.getFileNode(original);
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301 int changelogRevision = df.getChangesetLocalRevision(0);
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302 if (changelogRevision <= originalChangelogRevision) {
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303 // copy/rename source was known prior to rev1
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304 // (both r1Files.contains is true and original was created earlier than rev1)
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305 // without r1Files.contains changelogRevision <= rev1 won't suffice as the file
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306 // might get removed somewhere in between (changelogRevision < R < rev1)
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307 return original;
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308 }
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309 break; // copy/rename done later
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310 }
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311 df = hgRepo.getFileNode(original); // try more steps away
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312 }
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313 return null;
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314 }
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315
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316 // XXX for r1..r2 status, only modified, added, removed (and perhaps, clean) make sense
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317 // XXX Need to specify whether copy targets are in added or not (@see Inspector#copied above)
316
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318 /**
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319 * Straightforward {@link HgStatusInspector} implementation that collects all status values.
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320 *
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321 * <p>Naturally, {@link Record Records} originating from {@link HgStatusCollector} would report only <em>modified, added,
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322 * removed</em> and <em>clean</em> values, other are available only when using {@link Record} with {@link HgWorkingCopyStatusCollector}.
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323 *
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324 * <p>Note, this implementation records copied files as added, thus key values in {@link #getCopied()} map are subset of paths
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325 * from {@link #getAdded()}.
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326 */
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327 public static class Record implements HgStatusInspector {
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328 private List<Path> modified, added, removed, clean, missing, unknown, ignored;
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329 private Map<Path, Path> copied;
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330
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331 private int startRev, endRev;
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332 private HgStatusCollector statusHelper;
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333
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334 // XXX StatusCollector may additionally initialize Record instance to speed lookup of changed file revisions
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335 // here I need access to ManifestRevisionInspector via #raw(). Perhaps, non-static class (to get
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336 // implicit reference to StatusCollector) may be better?
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337 // Since users may want to reuse Record instance we've once created (and initialized), we need to
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338 // ensure functionality is correct for each/any call (#walk checks instanceof Record and fixes it up)
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339 // Perhaps, distinct helper (sc.getRevisionHelper().nodeid(fname)) would be better, just not clear
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340 // how to supply [start..end] values there easily
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341 /*package-local*/void init(int startRevision, int endRevision, HgStatusCollector self) {
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342 startRev = startRevision;
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343 endRev = endRevision;
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344 statusHelper = self;
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345 }
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346
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347 public Nodeid nodeidBeforeChange(Path fname) {
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348 if (statusHelper == null || startRev == BAD_REVISION) {
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349 return null;
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350 }
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351 if ((modified == null || !modified.contains(fname)) && (removed == null || !removed.contains(fname))) {
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352 return null;
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353 }
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354 return statusHelper.raw(startRev).nodeid(fname);
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355 }
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356 public Nodeid nodeidAfterChange(Path fname) {
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357 if (statusHelper == null || endRev == BAD_REVISION) {
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358 return null;
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359 }
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360 if ((modified == null || !modified.contains(fname)) && (added == null || !added.contains(fname))) {
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361 return null;
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362 }
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363 return statusHelper.raw(endRev).nodeid(fname);
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364 }
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365
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366 public List<Path> getModified() {
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367 return proper(modified);
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368 }
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369
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370 public List<Path> getAdded() {
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371 return proper(added);
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372 }
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373
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374 public List<Path> getRemoved() {
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375 return proper(removed);
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376 }
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377
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378 /**
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379 * Map files from {@link #getAdded()} to their original filenames, if were copied/moved.
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380 */
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381 public Map<Path,Path> getCopied() {
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382 if (copied == null) {
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383 return Collections.emptyMap();
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384 }
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385 return Collections.unmodifiableMap(copied);
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386 }
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387
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388 public List<Path> getClean() {
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389 return proper(clean);
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390 }
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391
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392 public List<Path> getMissing() {
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393 return proper(missing);
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394 }
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395
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396 public List<Path> getUnknown() {
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397 return proper(unknown);
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398 }
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399
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400 public List<Path> getIgnored() {
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401 return proper(ignored);
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402 }
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403
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404 private static List<Path> proper(List<Path> l) {
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405 if (l == null) {
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406 return Collections.emptyList();
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407 }
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408 return Collections.unmodifiableList(l);
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409 }
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410
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411 //
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412 //
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413
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414 public void modified(Path fname) {
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415 modified = doAdd(modified, fname);
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416 }
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417
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418 public void added(Path fname) {
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419 added = doAdd(added, fname);
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420 }
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421
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422 public void copied(Path fnameOrigin, Path fnameAdded) {
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423 if (copied == null) {
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424 copied = new LinkedHashMap<Path, Path>();
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425 }
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426 added(fnameAdded);
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427 copied.put(fnameAdded, fnameOrigin);
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428 }
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429
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430 public void removed(Path fname) {
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431 removed = doAdd(removed, fname);
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432 }
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433
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434 public void clean(Path fname) {
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435 clean = doAdd(clean, fname);
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436 }
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437
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438 public void missing(Path fname) {
55
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439 missing = doAdd(missing, fname);
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440 }
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441
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442 public void unknown(Path fname) {
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443 unknown = doAdd(unknown, fname);
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444 }
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445
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446 public void ignored(Path fname) {
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447 ignored = doAdd(ignored, fname);
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448 }
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449
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450 private static List<Path> doAdd(List<Path> l, Path p) {
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451 if (l == null) {
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d55d4eedfc57 Switch to Path instead of String in filenames returned by various status operations
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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452 l = new LinkedList<Path>();
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
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453 }
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 90
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454 l.add(p);
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
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455 return l;
05829a70b30b Status operation extracted into separate, cache-friendly class
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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456 }
05829a70b30b Status operation extracted into separate, cache-friendly class
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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457 }
05829a70b30b Status operation extracted into separate, cache-friendly class
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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458
05829a70b30b Status operation extracted into separate, cache-friendly class
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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459 }