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annotate src/org/tmatesoft/hg/core/HgFileRevision.java @ 486:d740edfff563

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Provisional support for Mercurial lock mechanism
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Fri, 10 Aug 2012 21:03:03 +0200
parents b3b1db9301a2
children 5dcb4581c8ef
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.repo.HgRuntimeException;
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24 import org.tmatesoft.hg.util.ByteChannel;
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25 import org.tmatesoft.hg.util.CancelledException;
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26 import org.tmatesoft.hg.util.Pair;
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27 import org.tmatesoft.hg.util.Path;
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29 /**
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30 * Keeps together information about specific file revision
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31 *
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32 * @author Artem Tikhomirov
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33 * @author TMate Software Ltd.
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34 */
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35 public final class HgFileRevision {
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36 private final HgRepository repo;
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37 private final Nodeid revision;
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38 private final Path path;
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39 private Path origin;
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40 private Boolean isCopy = null; // null means not yet known
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41 private Pair<Nodeid, Nodeid> parents;
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42 private Flags flags; // null unless set/extracted
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43
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44 /**
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45 * New description of a file revision from a specific repository.
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46 *
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47 * <p>Although this constructor is public, and clients can use it to construct own file revisions to pass e.g. to commands, its use is discouraged.
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48 *
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49 * @param hgRepo repository
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50 * @param rev file revision
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51 * @param manifestEntryFlags file flags at this revision (optional, may be null)
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52 * @param p path of the file at the given revision
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53 */
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54 public HgFileRevision(HgRepository hgRepo, Nodeid rev, HgManifest.Flags manifestEntryFlags, Path p) {
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55 if (hgRepo == null || rev == null || p == null) {
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56 // since it's package local, it is our code to blame for non validated arguments
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57 throw new IllegalArgumentException();
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58 }
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59 repo = hgRepo;
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60 revision = rev;
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61 flags = manifestEntryFlags;
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62 path = p;
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63 }
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64
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65 // 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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66 HgFileRevision(HgRepository hgRepo, Nodeid rev, HgManifest.Flags flags, Path p, Path orig) {
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67 this(hgRepo, rev, flags, p);
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68 isCopy = Boolean.valueOf(orig == null);
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69 origin = orig;
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70 }
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71
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72 public Path getPath() {
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73 return path;
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74 }
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75
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76 public Nodeid getRevision() {
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77 return revision;
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78 }
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79
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80 /**
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81 * Extract flags of the file as recorded in the manifest for this file revision
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82 * @return whether regular file, executable or a symbolic link
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83 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em>
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84 */
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85 public HgManifest.Flags getFileFlags() throws HgRuntimeException {
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86 if (flags == null) {
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87 /*
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88 * Note, for uses other than HgManifestCommand or HgChangesetFileSneaker, when no flags come through the cons,
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89 * it's possible to face next shortcoming:
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90 * Imagine csetA and csetB, with corresponding manifestA and manifestB, the file didn't change (revision/nodeid is the same)
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91 * but flag of the file has changed (e.g. became executable). Since HgFileRevision doesn't keep reference to
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92 * an actual manifest revision, but only file's, and it's likely the flags returned from this method would
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93 * yield result as from manifestA (i.e. no flag change in manifestB ever noticed).
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94 */
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95 HgDataFile df = repo.getFileNode(path);
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96 int revIdx = df.getRevisionIndex(revision);
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97 flags = df.getFlags(revIdx);
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98 }
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99 return flags;
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100 }
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101
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102 public boolean wasCopied() throws HgException {
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103 if (isCopy == null) {
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104 checkCopy();
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105 }
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106 return isCopy.booleanValue();
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107 }
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108 /**
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109 * @return <code>null</code> if {@link #wasCopied()} is <code>false</code>, name of the copy source otherwise.
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110 */
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111 public Path getOriginIfCopy() throws HgException {
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112 if (wasCopied()) {
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113 return origin;
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114 }
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115 return null;
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116 }
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117
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118 /**
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119 * Access revisions this file revision originates from.
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120 * Note, these revisions are records in the file history, not that of the whole repository (aka changeset revisions)
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121 * In most cases, only one parent revision would be present, only for merge revisions one can expect both.
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122 *
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123 * @return parent revisions of this file revision, with {@link Nodeid#NULL} for missing values.
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124 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em>
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125 */
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126 public Pair<Nodeid, Nodeid> getParents() throws HgRuntimeException {
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127 if (parents == null) {
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128 HgDataFile fn = repo.getFileNode(path);
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129 int revisionIndex = fn.getRevisionIndex(revision);
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130 int[] pr = new int[2];
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131 byte[] p1 = new byte[20], p2 = new byte[20];
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132 // XXX Revlog#parents is not the best method to use here
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133 // need smth that gives Nodeids (piped through Pool<Nodeid> from repo's context)
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134 fn.parents(revisionIndex, pr, p1, p2);
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135 parents = new Pair<Nodeid, Nodeid>(Nodeid.fromBinary(p1, 0), Nodeid.fromBinary(p2, 0));
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136 }
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137 return parents;
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138 }
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139
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140 public void putContentTo(ByteChannel sink) throws HgException, CancelledException {
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141 HgDataFile fn = repo.getFileNode(path);
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142 int revisionIndex = fn.getRevisionIndex(revision);
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143 fn.contentWithFilters(revisionIndex, sink);
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144 }
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145
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146 private void checkCopy() throws HgException {
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147 HgDataFile fn = repo.getFileNode(path);
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148 if (fn.isCopy()) {
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149 if (fn.getRevision(0).equals(revision)) {
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150 // this HgFileRevision represents first revision of the copy
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151 isCopy = Boolean.TRUE;
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152 origin = fn.getCopySourceName();
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153 return;
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154 }
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155 }
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156 isCopy = Boolean.FALSE;
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157 }
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158 }