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annotate src/org/tmatesoft/hg/internal/ChangelogHelper.java @ 269:7af843ecc378

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author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 23 Aug 2011 23:47:38 +0200
parents f052f40839ec
children 5f9073eabf06
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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.internal;
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19 import java.util.TreeMap;
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20
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21 import org.tmatesoft.hg.repo.HgChangelog.RawChangeset;
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22 import org.tmatesoft.hg.repo.HgDataFile;
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23 import org.tmatesoft.hg.repo.HgInternals;
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24 import org.tmatesoft.hg.repo.HgRepository;
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25 import org.tmatesoft.hg.util.Path;
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26
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27 /**
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28 *
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29 * @author Artem Tikhomirov
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30 * @author TMate Software Ltd.
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31 */
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32 public class ChangelogHelper {
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33 private final int leftBoundary;
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34 private final HgRepository repo;
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35 private final TreeMap<Integer, RawChangeset> cache = new TreeMap<Integer, RawChangeset>();
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36 private String nextCommitAuthor;
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37
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38 /**
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39 * @param hgRepo
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40 * @param leftBoundaryRevision walker never visits revisions with local numbers less than specified,
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41 * IOW only revisions [leftBoundaryRevision..TIP] are considered.
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42 */
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43 public ChangelogHelper(HgRepository hgRepo, int leftBoundaryRevision) {
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44 repo = hgRepo;
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45 leftBoundary = leftBoundaryRevision;
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46 }
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48 /**
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49 * @return the repo
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50 */
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51 public HgRepository getRepo() {
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52 return repo;
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53 }
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54
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55 /**
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56 * Walks changelog in reverse order
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57 * @param file
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58 * @return changeset where specified file is mentioned among affected files, or
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59 * <code>null</code> if none found up to leftBoundary
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60 */
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61 public RawChangeset findLatestChangeWith(Path file) {
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62 HgDataFile df = repo.getFileNode(file);
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63 if (!df.exists()) {
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64 return null;
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65 }
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66 int changelogRev = df.getChangesetLocalRevision(HgRepository.TIP);
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67 if (changelogRev >= leftBoundary) {
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68 // the method is likely to be invoked for different files,
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69 // while changesets might be the same. Cache 'em not to read too much.
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70 RawChangeset cs = cache.get(changelogRev);
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71 if (cs == null) {
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72 cs = repo.getChangelog().range(changelogRev, changelogRev).get(0);
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73 cache.put(changelogRev, cs);
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74 }
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75 return cs;
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76 }
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77 return null;
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78 }
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79
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80 public String getNextCommitUsername() {
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81 if (nextCommitAuthor == null) {
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82 nextCommitAuthor = new HgInternals(repo).getNextCommitUsername();
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83 }
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84 return nextCommitAuthor;
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85 }
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86 }