Mercurial > hg4j

annotate src/org/tmatesoft/hg/core/HgFileInformer.java @ 367:2fadf8695f8a

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Use 'revision index' instead of the vague 'local revision number' concept in the API
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Fri, 16 Dec 2011 15:37:27 +0100
parents 8099939af5fa
children c7a513d8ce20
rev   line source
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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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19 import org.tmatesoft.hg.internal.ManifestRevision;
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20 import org.tmatesoft.hg.repo.HgDataFile;
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21 import org.tmatesoft.hg.repo.HgInternals;
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22 import org.tmatesoft.hg.repo.HgRepository;
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23 import org.tmatesoft.hg.util.Path;
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24 import org.tmatesoft.hg.util.Status;
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26 /**
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27 * Primary purpose is to provide information about file revisions at specific changeset. Multiple {@link #check(Path)} calls
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28 * are possible once {@link #changeset(Nodeid)} (and optionally, {@link #followRenames(boolean)}) were set.
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29 *
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30 * <p>Sample:
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31 * <pre><code>
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32 * HgFileInformer i = new HgFileInformer(hgRepo).changeset(Nodeid.fromString("<40 digits>")).followRenames(true);
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33 * if (i.check(file)) {
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34 * HgCatCommand catCmd = new HgCatCommand(hgRepo).revision(i.getFileRevision());
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35 * catCmd.execute(...);
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36 * ...
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37 * }
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38 * </pre></code>
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39 *
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40 * FIXME need better name. It's more about manifest of specific changeset, rather than informing (about) files
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41 * TODO may add #manifest(Nodeid) to select manifest according to its revision (not only changeset revision as it's now)
354
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42 *
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43 * @author Artem Tikhomirov
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44 * @author TMate Software Ltd.
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45 */
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46 public class HgFileInformer {
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47
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48 private final HgRepository repo;
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49 private boolean followRenames;
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50 private Nodeid cset;
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51 private ManifestRevision cachedManifest;
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52 private HgFileRevision fileRevision;
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53 private boolean renamed;
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54 private Status checkResult;
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55
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56 public HgFileInformer(HgRepository hgRepo) {
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57 repo = hgRepo;
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58 }
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59
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60 /**
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61 * Select specific changelog revision
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62 *
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63 * @param nid changeset identifier
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64 * @return <code>this</code> for convenience
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65 */
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66 public HgFileInformer changeset(Nodeid nid) {
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67 if (nid == null || nid.isNull()) {
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68 throw new IllegalArgumentException();
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69 }
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70 cset = nid;
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71 cachedManifest = null;
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72 fileRevision = null;
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73 return this;
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74 }
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75
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76 /**
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77 * Whether to check file origins, default is false (look up only the name supplied)
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78 *
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79 * @param follow <code>true</code> to check copy/rename origin of the file if it is a copy.
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80 * @return <code>this</code> for convenience
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81 */
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82 public HgFileInformer followRenames(boolean follow) {
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83 followRenames = follow;
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84 fileRevision = null;
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85 return this;
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86 }
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87
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88 /**
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89 * Shortcut to perform {@link #check(Path)} and {@link #exists()}. Result of the check may be accessed via {@link #getCheckStatus()}.
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90 *
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91 * @param file name of the file in question
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92 * @return <code>true</code> if file is known at the selected changeset.
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93 * @throws IllegalArgumentException if {@link #changeset(Nodeid)} not specified or file argument is bad.
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94 * @throws HgInvalidControlFileException if access to revlog index/data entry failed
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95 */
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96 public boolean checkExists(Path file) throws HgInvalidControlFileException {
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97 check(file);
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98 if (!checkResult.isOk() && checkResult.getException() instanceof HgInvalidControlFileException) {
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99 throw (HgInvalidControlFileException) checkResult.getException();
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100 }
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101 return checkResult.isOk() && exists();
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102 }
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103
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104 /**
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105 * Find file (or its origin, if {@link #followRenames(boolean)} was set to <code>true</code>) among files known at specified {@link #changeset(Nodeid)}.
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106 *
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107 * @param file name of the file in question
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108 * @return status object that describes outcome, {@link Status#isOk() Ok} status indicates successful completion of the operation, but doesn't imply
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109 * file existence, use {@link #exists()} for that purpose. Message of the status may provide further hints on what exactly had happened.
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110 * @throws IllegalArgumentException if {@link #changeset(Nodeid)} not specified or file argument is bad.
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111 */
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112 public Status check(Path file) {
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113 fileRevision = null;
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114 checkResult = null;
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115 renamed = false;
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116 if (cset == null || file == null || file.isDirectory()) {
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117 throw new IllegalArgumentException();
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118 }
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119 HgDataFile dataFile = repo.getFileNode(file);
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120 if (!dataFile.exists()) {
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121 checkResult = new Status(Status.Kind.OK, String.format("File named %s is not known in the repository", file));
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122 return checkResult;
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123 }
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124 Nodeid toExtract = null;
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125 try {
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126 if (cachedManifest == null) {
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127 int csetRev = repo.getChangelog().getRevisionIndex(cset);
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128 cachedManifest = new ManifestRevision(null, null); // XXX how about context and cached manifest revisions
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129 repo.getManifest().walk(csetRev, csetRev, cachedManifest);
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130 // cachedManifest shall be meaningful - changelog.getRevisionIndex() above ensures we've got version that exists.
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131 }
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132 toExtract = cachedManifest.nodeid(file);
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133 if (toExtract == null && followRenames) {
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134 while (toExtract == null && dataFile.isCopy()) {
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135 renamed = true;
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136 file = dataFile.getCopySourceName();
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137 dataFile = repo.getFileNode(file);
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138 toExtract = cachedManifest.nodeid(file);
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139 }
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140 }
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141 } catch (HgInvalidControlFileException ex) {
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142 checkResult = new Status(Status.Kind.ERROR, "", ex);
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143 return checkResult;
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144 } catch (HgDataStreamException ex) {
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145 checkResult = new Status(Status.Kind.ERROR, "Follow copy/rename failed", ex);
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146 HgInternals.getContext(repo).getLog().warn(getClass(), ex, checkResult.getMessage());
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147 return checkResult;
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148 }
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149 if (toExtract != null) {
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150 fileRevision = new HgFileRevision(repo, toExtract, dataFile.getPath());
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151 checkResult = new Status(Status.Kind.OK, String.format("File %s, revision %s found at changeset %s", dataFile.getPath(), toExtract.shortNotation(), cset.shortNotation()));
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152 return checkResult;
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153 }
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154 checkResult = new Status(Status.Kind.OK, String.format("File %s nor its origins were not known at repository %s revision", file, cset.shortNotation()));
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155 return checkResult;
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156 }
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157
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158 /**
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159 * Re-get latest check status object
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160 */
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161 public Status getCheckStatus() {
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162 assertCheckRan();
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163 return checkResult;
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164 }
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165
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166 /**
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167 * @return result of the last {@link #check(Path)} call.
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168 */
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169 public boolean exists() {
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170 assertCheckRan();
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171 return fileRevision != null;
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172 }
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173
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174 /**
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175 * @return <code>true</code> if checked file was known by another name at the time of specified changeset.
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176 */
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177 public boolean hasAnotherName() {
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178 assertCheckRan();
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179 return renamed;
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180 }
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181
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182 /**
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183 * @return holder for file revision information
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184 */
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185 public HgFileRevision getFileRevision() {
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186 assertCheckRan();
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187 return fileRevision;
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188 }
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189
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190 /**
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191 * Name of the checked file as it was known at the time of the specified changeset.
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192 *
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193 * @return handy shortcut for <code>getFileRevision().getPath()</code>
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194 */
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195 public Path filename() {
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196 assertCheckRan();
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197 return fileRevision.getPath();
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198 }
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199
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200 /**
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201 * Revision of the checked file
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202 *
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203 * @return handy shortcut for <code>getFileRevision().getRevision()</code>
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204 */
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205 public Nodeid revision() {
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206 assertCheckRan();
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207 return fileRevision.getRevision();
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208 }
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209
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210 private void assertCheckRan() {
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211 if (checkResult == null) {
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212 throw new HgBadStateException("Shall invoke #check(Path) first");
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213 }
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214 }
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215 }