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annotate src/org/tmatesoft/hg/internal/ChangelogHelper.java @ 709:497e697636fc

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Report merged lines as changed block if possible, not as a sequence of added/deleted blocks. To facilitate access to merge parent lines AddBlock got mergeLineAt() method that reports index of the line in the second parent (if any), while insertedAt() has been changed to report index in the first parent always
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Wed, 21 Aug 2013 16:23:27 +0200
parents 6526d8adbc0f
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1 /*
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2 * Copyright (c) 2011-2013 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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18
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19 import org.tmatesoft.hg.repo.HgChangelog.RawChangeset;
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20 import org.tmatesoft.hg.repo.HgDataFile;
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21 import org.tmatesoft.hg.repo.HgInternals;
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22 import org.tmatesoft.hg.repo.HgRepository;
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23 import org.tmatesoft.hg.repo.HgRuntimeException;
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24 import org.tmatesoft.hg.util.Path;
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25
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26 /**
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27 *
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28 * @author Artem Tikhomirov
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29 * @author TMate Software Ltd.
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30 */
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31 public class ChangelogHelper {
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32 private final int leftBoundary;
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33 private final HgRepository repo;
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34 private final IntMap<RawChangeset> cache = new IntMap<RawChangeset>(32);
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35 private String nextCommitAuthor;
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36
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37 /**
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38 * @param hgRepo
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39 * @param leftBoundaryRevision walker never visits revisions with local numbers less than specified,
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40 * IOW only revisions [leftBoundaryRevision..TIP] are considered.
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41 */
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42 public ChangelogHelper(HgRepository hgRepo, int leftBoundaryRevision) {
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43 repo = hgRepo;
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44 leftBoundary = leftBoundaryRevision;
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45 }
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47 /**
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48 * @return the repo
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49 */
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50 public HgRepository getRepo() {
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51 return repo;
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52 }
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53
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54 /**
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55 * Walks changelog in reverse order
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56 * @param file
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57 * @return changeset where specified file is mentioned among affected files, or <code>null</code> if none found up to leftBoundary
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58 */
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59 public RawChangeset findLatestChangeWith(Path file) throws HgRuntimeException {
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60 HgDataFile df = repo.getFileNode(file);
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61 if (!df.exists()) {
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62 return null;
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63 }
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64 int changelogRev = df.getChangesetRevisionIndex(HgRepository.TIP);
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65 if (changelogRev >= leftBoundary) {
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66 // the method is likely to be invoked for different files,
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67 // while changesets might be the same. Cache 'em not to read too much.
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68 RawChangeset cs = cache.get(changelogRev);
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69 if (cs == null) {
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70 cs = repo.getChangelog().range(changelogRev, changelogRev).get(0);
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71 cache.put(changelogRev, cs);
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72 }
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73 return cs;
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74 }
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75 return null;
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76 }
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78 public String getNextCommitUsername() {
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79 if (nextCommitAuthor == null) {
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80 nextCommitAuthor = new HgInternals(repo).getNextCommitUsername();
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81 }
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82 return nextCommitAuthor;
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83 }
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84 }