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annotate src/org/tmatesoft/hg/core/HgFileRevision.java @ 396:0ae53c32ecef

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Straighten out exceptions thrown when file access failed - three is too much
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Thu, 23 Feb 2012 01:06:24 +0100
parents 2fadf8695f8a
children ee8264d80747
rev   line source
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1 /*
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2 * Copyright (c) 2011-2012 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.HgRepository;
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21 import org.tmatesoft.hg.util.ByteChannel;
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22 import org.tmatesoft.hg.util.CancelledException;
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23 import org.tmatesoft.hg.util.Pair;
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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 private Pair<Nodeid, Nodeid> parents;
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39
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40 public HgFileRevision(HgRepository hgRepo, Nodeid rev, Path p) {
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41 if (hgRepo == null || rev == null || p == null) {
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42 // since it's package local, it is our code to blame for non validated arguments
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43 throw new IllegalArgumentException();
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44 }
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45 repo = hgRepo;
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46 revision = rev;
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47 path = p;
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48 }
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49
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50 // 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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51 HgFileRevision(HgRepository hgRepo, Nodeid rev, Path p, Path orig) {
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52 this(hgRepo, rev, p);
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53 isCopy = Boolean.valueOf(orig == null);
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54 origin = orig;
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55 }
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56
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57 public Path getPath() {
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58 return path;
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59 }
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60
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61 public Nodeid getRevision() {
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62 return revision;
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63 }
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64
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65 public boolean wasCopied() throws HgException {
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66 if (isCopy == null) {
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67 checkCopy();
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68 }
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69 return isCopy.booleanValue();
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70 }
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71 /**
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72 * @return <code>null</code> if {@link #wasCopied()} is <code>false</code>, name of the copy source otherwise.
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73 */
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74 public Path getOriginIfCopy() throws HgException {
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75 if (wasCopied()) {
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76 return origin;
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77 }
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78 return null;
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79 }
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80
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81 /**
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82 * Access revisions this file revision originates from.
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83 * Note, these revisions are records in the file history, not that of the whole repository (aka changeset revisions)
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84 * In most cases, only one parent revision would be present, only for merge revisions one can expect both.
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85 *
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86 * @return parent revisions of this file revision, with {@link Nodeid#NULL} for missing values.
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87 */
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88 public Pair<Nodeid, Nodeid> getParents() throws HgInvalidControlFileException {
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89 if (parents == null) {
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90 HgDataFile fn = repo.getFileNode(path);
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91 int revisionIndex = fn.getRevisionIndex(revision);
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92 int[] pr = new int[2];
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93 byte[] p1 = new byte[20], p2 = new byte[20];
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94 // XXX Revlog#parents is not the best method to use here
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95 // need smth that gives Nodeids (piped through Pool<Nodeid> from repo's context)
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96 fn.parents(revisionIndex, pr, p1, p2);
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97 parents = new Pair<Nodeid, Nodeid>(Nodeid.fromBinary(p1, 0), Nodeid.fromBinary(p2, 0));
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98 }
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99 return parents;
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100 }
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101
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102 public void putContentTo(ByteChannel sink) throws HgException, CancelledException {
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103 HgDataFile fn = repo.getFileNode(path);
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104 int revisionIndex = fn.getRevisionIndex(revision);
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105 fn.contentWithFilters(revisionIndex, sink);
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106 }
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107
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108 private void checkCopy() throws HgException {
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109 HgDataFile fn = repo.getFileNode(path);
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110 if (fn.isCopy()) {
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111 if (fn.getRevision(0).equals(revision)) {
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112 // this HgFileRevision represents first revision of the copy
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113 isCopy = Boolean.TRUE;
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114 origin = fn.getCopySourceName();
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115 return;
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116 }
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117 }
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118 isCopy = Boolean.FALSE;
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119 }
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120 }