Mercurial > jhg

annotate src/org/tmatesoft/hg/core/HgFileRevision.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 ee6b467c1a5f
children 58725dd511b3
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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.core;
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18
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19 import org.tmatesoft.hg.repo.HgDataFile;
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20 import org.tmatesoft.hg.repo.HgInternals;
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21 import org.tmatesoft.hg.repo.HgRepository;
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22 import org.tmatesoft.hg.util.ByteChannel;
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23 import org.tmatesoft.hg.util.CancelledException;
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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 * Keeps together information about specific file revision
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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 final class HgFileRevision {
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33 private final HgRepository repo;
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34 private final Nodeid revision;
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35 private final Path path;
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36 private Path origin;
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37 private Boolean isCopy = null; // null means not yet known
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38
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39 public HgFileRevision(HgRepository hgRepo, Nodeid rev, Path p) {
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40 if (hgRepo == null || rev == null || p == null) {
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41 // since it's package local, it is our code to blame for non validated arguments
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42 throw new IllegalArgumentException();
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43 }
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44 repo = hgRepo;
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45 revision = rev;
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46 path = p;
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47 }
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48
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49 // this cons shall be used when we know whether p was a copy. Perhaps, shall pass Map<Path,Path> instead to stress orig argument is not optional
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50 HgFileRevision(HgRepository hgRepo, Nodeid rev, Path p, Path orig) {
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51 this(hgRepo, rev, p);
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52 isCopy = Boolean.valueOf(orig == null);
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53 origin = orig;
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54 }
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55
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56 public Path getPath() {
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57 return path;
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58 }
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59 public Nodeid getRevision() {
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60 return revision;
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61 }
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62 public boolean wasCopied() {
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63 if (isCopy == null) {
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64 checkCopy();
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65 }
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66 return isCopy.booleanValue();
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67 }
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68 /**
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69 * @return <code>null</code> if {@link #wasCopied()} is <code>false</code>, name of the copy source otherwise.
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70 */
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71 public Path getOriginIfCopy() {
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72 if (wasCopied()) {
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73 return origin;
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74 }
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75 return null;
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76 }
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77
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78 public void putContentTo(ByteChannel sink) throws HgDataStreamException, CancelledException {
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79 HgDataFile fn = repo.getFileNode(path);
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80 int localRevision = fn.getLocalRevision(revision);
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81 fn.contentWithFilters(localRevision, sink);
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82 }
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83
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84 private void checkCopy() {
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85 HgDataFile fn = repo.getFileNode(path);
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86 try {
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87 if (fn.isCopy()) {
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88 if (fn.getRevision(0).equals(revision)) {
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89 // this HgFileRevision represents first revision of the copy
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90 isCopy = Boolean.TRUE;
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91 origin = fn.getCopySourceName();
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92 return;
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93 }
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94 }
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95 } catch (HgDataStreamException ex) {
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96 HgInternals.getContext(repo).getLog().error(getClass(), ex, null);
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97 }
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98 isCopy = Boolean.FALSE;
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99 }
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100 }