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annotate src/org/tmatesoft/hg/internal/FileHistory.java @ 606:5daa42067e7c

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Avoid mmap files when only few bytes are to be read
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 07 May 2013 14:16:35 +0200
parents 43cfa08ff3fd
children 507602cb4fb3
rev   line source
596
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1 /*
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2 * Copyright (c) 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 static org.tmatesoft.hg.core.HgIterateDirection.NewToOld;
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20
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21 import java.util.Collections;
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22 import java.util.LinkedList;
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23
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24 import org.tmatesoft.hg.core.HgIterateDirection;
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25 import org.tmatesoft.hg.core.Nodeid;
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26 import org.tmatesoft.hg.repo.HgDataFile;
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27 import org.tmatesoft.hg.repo.HgRepository;
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28
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29 /**
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30 * History of a file, with copy/renames, and corresponding revision information.
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31 * Facility for file history iteration.
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32 *
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33 * FIXME [post-1.1] Utilize in HgLogCommand and anywhere else we need to follow file history
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34 *
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35 * @author Artem Tikhomirov
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36 * @author TMate Software Ltd.
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37 */
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38 public class FileHistory {
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39
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40 private LinkedList<FileRevisionHistoryChunk> fileCompleteHistory = new LinkedList<FileRevisionHistoryChunk>();
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41 private final HgDataFile df;
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42 private final int csetTo;
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43 private final int csetFrom;
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44
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45 public FileHistory(HgDataFile file, int fromChangeset, int toChangeset) {
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46 df = file;
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47 csetFrom = fromChangeset;
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48 csetTo = toChangeset;
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49 }
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50
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51 public int getStartChangeset() {
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52 return csetFrom;
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53 }
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54
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55 public int getEndChangeset() {
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56 return csetTo;
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57 }
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58
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59 public void build() {
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60 assert fileCompleteHistory.isEmpty();
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61 HgDataFile currentFile = df;
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62 final int changelogRevIndexEnd = csetTo;
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63 final int changelogRevIndexStart = csetFrom;
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64 int fileLastClogRevIndex = changelogRevIndexEnd;
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65 FileRevisionHistoryChunk nextChunk = null;
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66 fileCompleteHistory.clear(); // just in case, #build() is not expected to be called more than once
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67 do {
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68 FileRevisionHistoryChunk fileHistory = new FileRevisionHistoryChunk(currentFile);
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69 fileHistory.init(fileLastClogRevIndex);
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70 fileHistory.linkTo(nextChunk);
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71 fileCompleteHistory.addFirst(fileHistory); // to get the list in old-to-new order
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72 nextChunk = fileHistory;
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73 if (fileHistory.changeset(0) > changelogRevIndexStart && currentFile.isCopy()) {
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74 // fileHistory.changeset(0) is the earliest revision we know about so far,
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75 // once we get to revisions earlier than the requested start, stop digging.
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76 // The reason there's NO == (i.e. not >=) because:
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77 // (easy): once it's equal, we've reached our intended start
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78 // (hard): if changelogRevIndexStart happens to be exact start of one of renames in the
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79 // chain of renames (test-annotate2 repository, file1->file1a->file1b, i.e. points
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80 // to the very start of file1a or file1 history), presence of == would get us to the next
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81 // chunk and hence changed parents of present chunk's first element. Our annotate alg
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82 // relies on parents only (i.e. knows nothing about 'last iteration element') to find out
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83 // what to compare, and hence won't report all lines of 'last iteration element' (which is the
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84 // first revision of the renamed file) as "added in this revision", leaving gaps in annotate
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85 HgRepository repo = currentFile.getRepo();
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86 Nodeid originLastRev = currentFile.getCopySourceRevision();
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87 currentFile = repo.getFileNode(currentFile.getCopySourceName());
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88 fileLastClogRevIndex = currentFile.getChangesetRevisionIndex(currentFile.getRevisionIndex(originLastRev));
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89 // XXX perhaps, shall fail with meaningful exception if new file doesn't exist (.i/.d not found for whatever reason)
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90 // or source revision is missing?
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91 } else {
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92 fileHistory.chopAtChangeset(changelogRevIndexStart);
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93 currentFile = null; // stop iterating
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94 }
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95 } while (currentFile != null && fileLastClogRevIndex > changelogRevIndexStart);
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96 // fileCompleteHistory is in (origin, intermediate target, ultimate target) order
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97 }
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98
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99 public Iterable<FileRevisionHistoryChunk> iterate(HgIterateDirection order) {
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100 if (order == NewToOld) {
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101 return ReverseIterator.reversed(fileCompleteHistory);
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102 }
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103 return Collections.unmodifiableList(fileCompleteHistory);
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104 }
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105 }