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annotate src/org/tmatesoft/hg/internal/ChangelogHelper.java @ 338:3cfa4d908fc9

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Add options to control DataAccessProvider, allow to turn off use of file memory mapping in particular to solve potential sharing violation (os file handle gets released on MappedByteByffer being GC'd, not on FileChannel.close())
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 15 Nov 2011 04:47:03 +0100
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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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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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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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 }