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annotate src/org/tmatesoft/hg/core/HgFileRevision.java @ 417:ccd7d25e5aea

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New and better name for HgFileInformer - HgChangesetFileSneaker. Explain (comments) ties between HgManifest, HgDataFile, HgChangesetFileSneaker and reasons for method placement
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Thu, 22 Mar 2012 20:14:06 +0100
parents ee8264d80747
children 9c9c442b5f2e
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.HgManifest;
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21 import org.tmatesoft.hg.repo.HgManifest.Flags;
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22 import org.tmatesoft.hg.repo.HgRepository;
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23 import org.tmatesoft.hg.util.ByteChannel;
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24 import org.tmatesoft.hg.util.CancelledException;
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25 import org.tmatesoft.hg.util.Pair;
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26 import org.tmatesoft.hg.util.Path;
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27
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28 /**
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29 * Keeps together information about specific file revision
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30 *
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31 * @author Artem Tikhomirov
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32 * @author TMate Software Ltd.
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33 */
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34 public final class HgFileRevision {
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35 private final HgRepository repo;
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36 private final Nodeid revision;
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37 private final Path path;
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38 private Path origin;
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39 private Boolean isCopy = null; // null means not yet known
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40 private Pair<Nodeid, Nodeid> parents;
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41 private Flags flags; // null unless set/extracted
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42
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43 /**
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44 * FIXME has to be public?
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45 *
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46 * @param hgRepo repository
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47 * @param rev file revision
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48 * @param manifestEntryFlags file flags at this revision (optional, may be null)
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49 * @param p path of the file at the given revision
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50 */
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51 public HgFileRevision(HgRepository hgRepo, Nodeid rev, HgManifest.Flags manifestEntryFlags, Path p) {
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52 if (hgRepo == null || rev == null || p == null) {
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53 // since it's package local, it is our code to blame for non validated arguments
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54 throw new IllegalArgumentException();
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55 }
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56 repo = hgRepo;
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57 revision = rev;
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58 flags = manifestEntryFlags;
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59 path = p;
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60 }
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61
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62 // 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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63 HgFileRevision(HgRepository hgRepo, Nodeid rev, HgManifest.Flags flags, Path p, Path orig) {
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64 this(hgRepo, rev, flags, p);
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65 isCopy = Boolean.valueOf(orig == null);
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66 origin = orig;
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67 }
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68
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69 public Path getPath() {
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70 return path;
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71 }
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72
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73 public Nodeid getRevision() {
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74 return revision;
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75 }
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76
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77 /**
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78 * Executable or symbolic link, or <code>null</code> if regular file
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79 * @throws HgInvalidRevisionException if supplied nodeid doesn't identify any revision from this revlog
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80 * @throws HgInvalidControlFileException if access to revlog index/data entry failed
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81 */
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82 public HgManifest.Flags getFileFlags() throws HgInvalidControlFileException, HgInvalidRevisionException {
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83 if (flags == null) {
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84 HgDataFile df = repo.getFileNode(path);
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85 int revIdx = df.getRevisionIndex(revision);
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86 flags = df.getFlags(revIdx);
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87 }
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88 return flags;
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89 }
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90
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91 public boolean wasCopied() throws HgException {
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92 if (isCopy == null) {
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93 checkCopy();
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94 }
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95 return isCopy.booleanValue();
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96 }
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97 /**
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98 * @return <code>null</code> if {@link #wasCopied()} is <code>false</code>, name of the copy source otherwise.
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99 */
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100 public Path getOriginIfCopy() throws HgException {
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101 if (wasCopied()) {
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102 return origin;
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103 }
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104 return null;
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105 }
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106
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107 /**
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108 * Access revisions this file revision originates from.
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109 * Note, these revisions are records in the file history, not that of the whole repository (aka changeset revisions)
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110 * In most cases, only one parent revision would be present, only for merge revisions one can expect both.
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111 *
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112 * @return parent revisions of this file revision, with {@link Nodeid#NULL} for missing values.
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113 */
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114 public Pair<Nodeid, Nodeid> getParents() throws HgInvalidControlFileException {
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115 if (parents == null) {
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116 HgDataFile fn = repo.getFileNode(path);
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117 int revisionIndex = fn.getRevisionIndex(revision);
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118 int[] pr = new int[2];
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119 byte[] p1 = new byte[20], p2 = new byte[20];
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120 // XXX Revlog#parents is not the best method to use here
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121 // need smth that gives Nodeids (piped through Pool<Nodeid> from repo's context)
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122 fn.parents(revisionIndex, pr, p1, p2);
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123 parents = new Pair<Nodeid, Nodeid>(Nodeid.fromBinary(p1, 0), Nodeid.fromBinary(p2, 0));
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124 }
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125 return parents;
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126 }
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127
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128 public void putContentTo(ByteChannel sink) throws HgException, CancelledException {
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129 HgDataFile fn = repo.getFileNode(path);
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130 int revisionIndex = fn.getRevisionIndex(revision);
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131 fn.contentWithFilters(revisionIndex, sink);
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132 }
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133
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134 private void checkCopy() throws HgException {
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135 HgDataFile fn = repo.getFileNode(path);
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136 if (fn.isCopy()) {
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137 if (fn.getRevision(0).equals(revision)) {
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138 // this HgFileRevision represents first revision of the copy
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139 isCopy = Boolean.TRUE;
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140 origin = fn.getCopySourceName();
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141 return;
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142 }
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143 }
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144 isCopy = Boolean.FALSE;
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145 }
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146 }