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annotate src/org/tmatesoft/hg/core/HgFileInformer.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 c7a513d8ce20
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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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.HgRepository;
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22 import org.tmatesoft.hg.util.Path;
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23 import org.tmatesoft.hg.util.Status;
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25 /**
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26 * Primary purpose is to provide information about file revisions at specific changeset. Multiple {@link #check(Path)} calls
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27 * are possible once {@link #changeset(Nodeid)} (and optionally, {@link #followRenames(boolean)}) were set.
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28 *
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29 * <p>Sample:
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30 * <pre><code>
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31 * HgFileInformer i = new HgFileInformer(hgRepo).changeset(Nodeid.fromString("<40 digits>")).followRenames(true);
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32 * if (i.check(file)) {
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33 * HgCatCommand catCmd = new HgCatCommand(hgRepo).revision(i.getFileRevision());
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34 * catCmd.execute(...);
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35 * ...
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36 * }
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37 * </pre></code>
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38 *
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39 * FIXME need better name. It's more about manifest of specific changeset, rather than informing (about) files
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40 * TODO may add #manifest(Nodeid) to select manifest according to its revision (not only changeset revision as it's now)
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41 *
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42 * @author Artem Tikhomirov
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43 * @author TMate Software Ltd.
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44 */
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45 public class HgFileInformer {
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46
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47 private final HgRepository repo;
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48 private boolean followRenames;
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49 private Nodeid cset;
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50 private ManifestRevision cachedManifest;
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51 private HgFileRevision fileRevision;
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52 private boolean renamed;
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53 private Status checkResult;
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55 public HgFileInformer(HgRepository hgRepo) {
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56 repo = hgRepo;
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57 }
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58
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59 /**
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60 * Select specific changelog revision
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61 *
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62 * @param nid changeset identifier
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63 * @return <code>this</code> for convenience
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64 */
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65 public HgFileInformer changeset(Nodeid nid) {
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66 if (nid == null || nid.isNull()) {
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67 throw new IllegalArgumentException();
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68 }
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69 cset = nid;
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70 cachedManifest = null;
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71 fileRevision = null;
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72 return this;
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73 }
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74
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75 /**
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76 * Whether to check file origins, default is false (look up only the name supplied)
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77 *
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78 * @param follow <code>true</code> to check copy/rename origin of the file if it is a copy.
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79 * @return <code>this</code> for convenience
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80 */
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81 public HgFileInformer followRenames(boolean follow) {
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82 followRenames = follow;
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83 fileRevision = null;
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84 return this;
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85 }
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86
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87 /**
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88 * Shortcut to perform {@link #check(Path)} and {@link #exists()}. Result of the check may be accessed via {@link #getCheckStatus()}.
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89 *
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90 * @param file name of the file in question
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91 * @return <code>true</code> if file is known at the selected changeset.
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92 * @throws IllegalArgumentException if {@link #changeset(Nodeid)} not specified or file argument is bad.
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93 * @throws HgInvalidControlFileException if access to revlog index/data entry failed
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94 */
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95 public boolean checkExists(Path file) throws HgInvalidControlFileException {
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96 check(file);
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97 if (!checkResult.isOk() && checkResult.getException() instanceof HgInvalidControlFileException) {
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98 throw (HgInvalidControlFileException) checkResult.getException();
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99 }
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100 return checkResult.isOk() && exists();
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101 }
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102
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103 /**
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104 * 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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105 *
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106 * @param file name of the file in question
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107 * @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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108 * 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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109 * @throws IllegalArgumentException if {@link #changeset(Nodeid)} not specified or file argument is bad.
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110 */
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111 public Status check(Path file) {
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112 fileRevision = null;
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113 checkResult = null;
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114 renamed = false;
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115 if (cset == null || file == null || file.isDirectory()) {
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116 throw new IllegalArgumentException();
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117 }
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118 HgDataFile dataFile = repo.getFileNode(file);
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119 if (!dataFile.exists()) {
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120 checkResult = new Status(Status.Kind.OK, String.format("File named %s is not known in the repository", file));
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121 return checkResult;
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122 }
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123 Nodeid toExtract = null;
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124 String phaseMsg = "Extract manifest revision failed";
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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 phaseMsg = "Follow copy/rename failed";
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134 if (toExtract == null && followRenames) {
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135 while (toExtract == null && dataFile.isCopy()) {
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136 renamed = true;
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137 file = dataFile.getCopySourceName();
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138 dataFile = repo.getFileNode(file);
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139 toExtract = cachedManifest.nodeid(file);
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140 }
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141 }
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142 } catch (HgException ex) {
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143 checkResult = new Status(Status.Kind.ERROR, phaseMsg, ex);
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144 return checkResult;
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145 }
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146 if (toExtract != null) {
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147 fileRevision = new HgFileRevision(repo, toExtract, dataFile.getPath());
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148 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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149 return checkResult;
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150 }
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151 checkResult = new Status(Status.Kind.OK, String.format("File %s nor its origins were known at repository %s revision", file, cset.shortNotation()));
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152 return checkResult;
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153 }
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154
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155 /**
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156 * Re-get latest check status object
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157 */
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158 public Status getCheckStatus() {
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159 assertCheckRan();
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160 return checkResult;
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161 }
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162
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163 /**
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164 * @return result of the last {@link #check(Path)} call.
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165 */
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166 public boolean exists() {
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167 assertCheckRan();
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168 return fileRevision != null;
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169 }
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170
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171 /**
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172 * @return <code>true</code> if checked file was known by another name at the time of specified changeset.
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173 */
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174 public boolean hasAnotherName() {
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175 assertCheckRan();
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176 return renamed;
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177 }
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178
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179 /**
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180 * @return holder for file revision information
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181 */
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182 public HgFileRevision getFileRevision() {
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183 assertCheckRan();
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184 return fileRevision;
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185 }
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186
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187 /**
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188 * Name of the checked file as it was known at the time of the specified changeset.
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189 *
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190 * @return handy shortcut for <code>getFileRevision().getPath()</code>
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191 */
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192 public Path filename() {
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193 assertCheckRan();
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194 return fileRevision.getPath();
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195 }
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196
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197 /**
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198 * Revision of the checked file
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199 *
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200 * @return handy shortcut for <code>getFileRevision().getRevision()</code>
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201 */
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202 public Nodeid revision() {
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203 assertCheckRan();
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204 return fileRevision.getRevision();
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205 }
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206
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207 private void assertCheckRan() {
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208 if (checkResult == null) {
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209 throw new HgBadStateException("Shall invoke #check(Path) first");
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210 }
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211 }
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212 }