Mercurial > jhg

annotate src/org/tmatesoft/hg/core/HgChangesetFileSneaker.java @ 495:abfbe81154b5

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Do not use exception when only metadata processing is needed. For hg4j repo, status 0:-1 changed from 500 to 60 ms
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Fri, 19 Oct 2012 16:03:21 +0200
parents 3ca4ae7bdd38
children b286222158be
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.HgInvalidStateException;
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22 import org.tmatesoft.hg.repo.HgManifest;
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23 import org.tmatesoft.hg.repo.HgRepository;
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24 import org.tmatesoft.hg.repo.HgRuntimeException;
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25 import org.tmatesoft.hg.util.Path;
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26 import org.tmatesoft.hg.util.Outcome;
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28 /**
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29 * Primary purpose is to provide information about file revisions at specific changeset. Multiple {@link #check(Path)} calls
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30 * are possible once {@link #changeset(Nodeid)} (and optionally, {@link #followRenames(boolean)}) were set.
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31 *
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32 * <p>Sample:
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33 * <pre><code>
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34 * HgChangesetFileSneaker i = new HgChangesetFileSneaker(hgRepo).changeset(Nodeid.fromString("<40 digits>")).followRenames(true);
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35 * if (i.check(file)) {
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36 * HgCatCommand catCmd = new HgCatCommand(hgRepo).revision(i.getFileRevision());
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37 * catCmd.execute(...);
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38 * ...
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39 * }
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40 * </pre></code>
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41 *
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42 * TODO may add #manifest(Nodeid) to select manifest according to its revision (not only changeset revision as it's now)
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43 *
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44 * <p>Unlike {@link HgManifest#getFileRevision(int, Path)}, this class is useful when few files from the same changeset have to be inspected
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45 *
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46 * @see HgManifest#getFileRevision(int, Path)
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47 * @author Artem Tikhomirov
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48 * @author TMate Software Ltd.
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49 */
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50 public final class HgChangesetFileSneaker {
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51
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52 private final HgRepository repo;
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53 private boolean followRenames;
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54 private Nodeid cset;
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55 private ManifestRevision cachedManifest;
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56 private HgFileRevision fileRevision;
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57 private boolean renamed;
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58 private Outcome checkResult;
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59
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60 public HgChangesetFileSneaker(HgRepository hgRepo) {
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61 repo = hgRepo;
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62 }
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63
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64 /**
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65 * Select specific changelog revision
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66 *
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67 * @param nid changeset identifier
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68 * @return <code>this</code> for convenience
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69 */
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70 public HgChangesetFileSneaker changeset(Nodeid nid) {
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71 if (nid == null || nid.isNull()) {
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72 throw new IllegalArgumentException();
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73 }
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74 cset = nid;
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75 cachedManifest = null;
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76 fileRevision = null;
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77 return this;
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78 }
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80 /**
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81 * Whether to check file origins, default is false (look up only the name supplied)
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82 *
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83 * @param follow <code>true</code> to check copy/rename origin of the file if it is a copy.
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84 * @return <code>this</code> for convenience
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85 */
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86 public HgChangesetFileSneaker followRenames(boolean follow) {
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87 followRenames = follow;
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88 fileRevision = null;
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89 return this;
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90 }
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91
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92 /**
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93 * Shortcut to perform {@link #check(Path)} and {@link #exists()}. Result of the check may be accessed via {@link #getCheckResult()}.
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94 * Errors during the check, if any, are reported through exception.
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95 *
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96 * @param file name of the file in question
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97 * @return <code>true</code> if file is known at the selected changeset.
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98 * @throws HgException subclass thereof to indicate specific issue with the command arguments or repository state
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99 * @throws IllegalArgumentException if {@link #changeset(Nodeid)} not specified or file argument is bad.
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100 */
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101 public boolean checkExists(Path file) throws HgException {
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102 check(file);
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103 // next seems reasonable, however renders boolean return value useless. perhaps void or distinct method?
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104 // if (checkResult.isOk() && !exists()) {
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105 // throw new HgPathNotFoundException(checkResult.getMessage(), file);
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106 // }
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107 if (!checkResult.isOk() && checkResult.getException() instanceof HgRuntimeException) {
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108 throw new HgLibraryFailureException((HgRuntimeException) checkResult.getException());
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109 }
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110 return checkResult.isOk() && exists();
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111 }
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112
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113 /**
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114 * 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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115 *
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116 * @param file name of the file in question
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117 * @return status object that describes outcome, {@link Outcome#isOk() Ok} status indicates successful completion of the operation, but doesn't imply
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118 * 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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119 * @throws IllegalArgumentException if {@link #changeset(Nodeid)} not specified or file argument is bad.
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120 */
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121 public Outcome check(Path file) {
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122 fileRevision = null;
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123 checkResult = null;
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124 renamed = false;
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125 if (cset == null || file == null || file.isDirectory()) {
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126 throw new IllegalArgumentException();
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127 }
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128 HgDataFile dataFile = repo.getFileNode(file);
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129 if (!dataFile.exists()) {
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130 checkResult = new Outcome(Outcome.Kind.Success, String.format("File named %s is not known in the repository", file));
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131 return checkResult;
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132 }
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133 Nodeid toExtract = null;
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134 HgManifest.Flags extractRevFlags = null;
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135 String phaseMsg = "Extract manifest revision failed";
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136 try {
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137 if (cachedManifest == null) {
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138 int csetRev = repo.getChangelog().getRevisionIndex(cset);
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139 cachedManifest = new ManifestRevision(null, null); // XXX how about context and cached manifest revisions
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140 repo.getManifest().walk(csetRev, csetRev, cachedManifest);
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141 // cachedManifest shall be meaningful - changelog.getRevisionIndex() above ensures we've got version that exists.
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142 }
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143 toExtract = cachedManifest.nodeid(file);
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144 extractRevFlags = cachedManifest.flags(file);
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145 phaseMsg = "Follow copy/rename failed";
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146 if (toExtract == null && followRenames) {
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147 while (toExtract == null && dataFile.isCopy()) {
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148 renamed = true;
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149 file = dataFile.getCopySourceName();
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150 dataFile = repo.getFileNode(file);
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151 toExtract = cachedManifest.nodeid(file);
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152 extractRevFlags = cachedManifest.flags(file);
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153 }
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154 }
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155 } catch (HgRuntimeException ex) {
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156 checkResult = new Outcome(Outcome.Kind.Failure, phaseMsg, ex);
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157 return checkResult;
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158 }
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159 if (toExtract != null) {
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160 fileRevision = new HgFileRevision(repo, toExtract, extractRevFlags, dataFile.getPath());
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161 checkResult = new Outcome(Outcome.Kind.Success, String.format("File %s, revision %s found at changeset %s", dataFile.getPath(), toExtract.shortNotation(), cset.shortNotation()));
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162 return checkResult;
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163 }
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164 checkResult = new Outcome(Outcome.Kind.Success, String.format("File %s nor its origins were known at repository %s revision", file, cset.shortNotation()));
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165 return checkResult;
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166 }
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167
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168 /**
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169 * Re-get latest check status object
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170 */
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171 public Outcome getCheckResult() {
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172 assertCheckRan();
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173 return checkResult;
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174 }
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175
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176 /**
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177 * @return result of the last {@link #check(Path)} call.
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178 */
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179 public boolean exists() {
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180 assertCheckRan();
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181 return fileRevision != null;
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182 }
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183
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184 /**
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185 * @return <code>true</code> if checked file was known by another name at the time of specified changeset.
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186 */
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187 public boolean hasAnotherName() {
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188 assertCheckRan();
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189 return renamed;
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190 }
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192 /**
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193 * @return holder for file revision information
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194 */
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195 public HgFileRevision getFileRevision() {
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196 assertCheckRan();
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197 return fileRevision;
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198 }
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199
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200 /**
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201 * Name of the checked file as it was known at the time of the specified changeset.
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202 *
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203 * @return handy shortcut for <code>getFileRevision().getPath()</code>
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204 */
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205 public Path filename() {
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206 assertCheckRan();
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207 return fileRevision.getPath();
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208 }
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209
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210 /**
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211 * Revision of the checked file
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212 *
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213 * @return handy shortcut for <code>getFileRevision().getRevision()</code>
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214 */
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215 public Nodeid revision() {
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216 assertCheckRan();
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217 return fileRevision.getRevision();
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218 }
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219
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220 private void assertCheckRan() {
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8099939af5fa Utilize status object to supply more information about manifest check for specific file
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221 if (checkResult == null) {
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9c9c442b5f2e Major refactoring of exception handling. Low-level API uses RuntimeExceptions, while checked are left for higher level
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222 throw new HgInvalidStateException("Shall invoke #check(Path) first");
248
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223 }
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224 }
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ccd7d25e5aea New and better name for HgFileInformer - HgChangesetFileSneaker. Explain (comments) ties between HgManifest, HgDataFile, HgChangesetFileSneaker and reasons for method placement
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225
248
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226 }