annotate src/org/tmatesoft/hg/core/HgChangesetFileSneaker.java @ 690:b286222158be

Fix file.isCopy() use for status and cat commands
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Thu, 01 Aug 2013 21:45:47 +0200
parents 3ca4ae7bdd38
children 72fc7774b87e
rev   line source
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1 /*
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2 * Copyright (c) 2011-2013 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 java.util.ArrayDeque;
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20
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21 import org.tmatesoft.hg.internal.ManifestRevision;
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22 import org.tmatesoft.hg.repo.HgDataFile;
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23 import org.tmatesoft.hg.repo.HgInvalidStateException;
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24 import org.tmatesoft.hg.repo.HgManifest;
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25 import org.tmatesoft.hg.repo.HgManifest.Flags;
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26 import org.tmatesoft.hg.repo.HgRepository;
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27 import org.tmatesoft.hg.repo.HgRuntimeException;
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28 import org.tmatesoft.hg.util.Outcome;
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29 import org.tmatesoft.hg.util.Pair;
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30 import org.tmatesoft.hg.util.Path;
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32 /**
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33 * Primary purpose is to provide information about file revisions at specific changeset. Multiple {@link #check(Path)} calls
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34 * are possible once {@link #changeset(Nodeid)} (and optionally, {@link #followRenames(boolean)}) were set.
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35 *
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36 * <p>Sample:
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37 * <pre><code>
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38 * HgChangesetFileSneaker i = new HgChangesetFileSneaker(hgRepo).changeset(Nodeid.fromString("<40 digits>")).followRenames(true);
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39 * if (i.check(file)) {
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40 * HgCatCommand catCmd = new HgCatCommand(hgRepo).revision(i.getFileRevision());
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41 * catCmd.execute(...);
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42 * ...
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43 * }
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44 * </pre></code>
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45 *
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46 * TODO may add #manifest(Nodeid) to select manifest according to its revision (not only changeset revision as it's now)
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47 *
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48 * <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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49 *
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50 * @see HgManifest#getFileRevision(int, Path)
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51 * @author Artem Tikhomirov
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52 * @author TMate Software Ltd.
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53 */
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54 public final class HgChangesetFileSneaker {
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55
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56 private final HgRepository repo;
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57 private boolean followRenames;
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58 private Nodeid cset;
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59 private ManifestRevision cachedManifest;
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60 private HgFileRevision fileRevision;
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61 private boolean renamed;
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62 private Outcome checkResult;
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63
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64 public HgChangesetFileSneaker(HgRepository hgRepo) {
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65 repo = hgRepo;
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66 }
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67
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68 /**
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69 * Select specific changelog revision
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70 *
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71 * @param nid changeset identifier
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72 * @return <code>this</code> for convenience
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73 */
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74 public HgChangesetFileSneaker changeset(Nodeid nid) {
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75 if (nid == null || nid.isNull()) {
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76 throw new IllegalArgumentException();
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77 }
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78 cset = nid;
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79 cachedManifest = null;
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80 fileRevision = null;
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81 return this;
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82 }
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83
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84 /**
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85 * Whether to check file origins, default is false (look up only the name supplied)
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86 *
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87 * @param follow <code>true</code> to check copy/rename origin of the file if it is a copy.
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88 * @return <code>this</code> for convenience
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89 */
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90 public HgChangesetFileSneaker followRenames(boolean follow) {
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91 followRenames = follow;
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92 fileRevision = null;
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93 return this;
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94 }
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95
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96 /**
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97 * Shortcut to perform {@link #check(Path)} and {@link #exists()}. Result of the check may be accessed via {@link #getCheckResult()}.
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98 * Errors during the check, if any, are reported through exception.
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99 *
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100 * @param file name of the file in question
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101 * @return <code>true</code> if file is known at the selected changeset.
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102 * @throws HgException subclass thereof to indicate specific issue with the command arguments or repository state
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103 * @throws IllegalArgumentException if {@link #changeset(Nodeid)} not specified or file argument is bad.
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104 */
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105 public boolean checkExists(Path file) throws HgException {
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106 check(file);
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107 // next seems reasonable, however renders boolean return value useless. perhaps void or distinct method?
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108 // if (checkResult.isOk() && !exists()) {
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109 // throw new HgPathNotFoundException(checkResult.getMessage(), file);
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110 // }
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111 if (!checkResult.isOk() && checkResult.getException() instanceof HgRuntimeException) {
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112 throw new HgLibraryFailureException((HgRuntimeException) checkResult.getException());
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113 }
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114 return checkResult.isOk() && exists();
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115 }
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116
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117 /**
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118 * 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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119 *
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120 * @param file name of the file in question
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121 * @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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122 * 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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123 * @throws IllegalArgumentException if {@link #changeset(Nodeid)} not specified or file argument is bad.
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124 */
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125 public Outcome check(Path file) {
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126 fileRevision = null;
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127 checkResult = null;
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128 renamed = false;
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129 if (cset == null || file == null || file.isDirectory()) {
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130 throw new IllegalArgumentException();
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131 }
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132 HgDataFile dataFile = repo.getFileNode(file);
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133 if (!dataFile.exists()) {
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134 checkResult = new Outcome(Outcome.Kind.Success, String.format("File named %s is not known in the repository", file));
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135 return checkResult;
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136 }
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137 Nodeid toExtract = null;
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138 String phaseMsg = "Extract manifest revision failed";
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139 try {
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140 if (cachedManifest == null) {
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141 int csetRev = repo.getChangelog().getRevisionIndex(cset);
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142 cachedManifest = new ManifestRevision(null, null); // XXX how about context and cached manifest revisions
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143 repo.getManifest().walk(csetRev, csetRev, cachedManifest);
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144 // cachedManifest shall be meaningful - changelog.getRevisionIndex() above ensures we've got version that exists.
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145 }
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146 toExtract = cachedManifest.nodeid(file);
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147 phaseMsg = "Follow copy/rename failed";
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148 if (toExtract == null && followRenames) {
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149 int csetIndex = repo.getChangelog().getRevisionIndex(cset);
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150 int ccFileRevIndex = dataFile.getLastRevision(); // copy candidate
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151 int csetFileEnds = dataFile.getChangesetRevisionIndex(ccFileRevIndex);
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152 if (csetIndex > csetFileEnds) {
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153 return new Outcome(Outcome.Kind.Success, String.format("%s: last known changeset for the file %s is %d. Follow renames is possible towards older changesets only", phaseMsg, file, csetFileEnds));
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154 }
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155 // XXX code is similar to that in HgStatusCollector#getOriginIfCopy. Why it's different in lastOrigin processing then?
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156 // traceback stack keeps record of all files with isCopy(fileRev) == true we've tried to follow, so that we can try earlier file
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157 // revisions in case followed fileRev didn't succeed
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158 ArrayDeque<Pair<HgDataFile, Integer>> traceback = new ArrayDeque<Pair<HgDataFile, Integer>>();
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159 do {
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160 int ccCsetIndex = dataFile.getChangesetRevisionIndex(ccFileRevIndex);
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161 if (ccCsetIndex <= csetIndex) {
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162 // present dataFile is our (distant) origin
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163 toExtract = dataFile.getRevision(ccFileRevIndex);
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164 renamed = true;
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165 break;
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166 }
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167 if (!dataFile.isCopy(ccFileRevIndex)) {
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168 // nothing left to return to when traceback.isEmpty()
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169 while (ccFileRevIndex == 0 && !traceback.isEmpty()) {
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170 Pair<HgDataFile, Integer> lastTurnPoint = traceback.pop();
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171 dataFile = lastTurnPoint.first();
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172 ccFileRevIndex = lastTurnPoint.second(); // generally ccFileRevIndex != 0 here, but doesn't hurt to check, hence while
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173 // fall through to shift down from the file revision we've already looked at
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174 }
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175 ccFileRevIndex--;
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176 continue;
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177 }
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178 if (ccFileRevIndex > 0) {
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179 // there's no reason to memorize turn point if it's the very first revision
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180 // of the file and we won't be able to try any other earlier revision
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181 traceback.push(new Pair<HgDataFile, Integer>(dataFile, ccFileRevIndex));
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182 }
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183 HgFileRevision origin = dataFile.getCopySource(ccFileRevIndex);
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184 dataFile = repo.getFileNode(origin.getPath());
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185 ccFileRevIndex = dataFile.getRevisionIndex(origin.getRevision());
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186 } while (ccFileRevIndex >= 0);
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187 // didn't get to csetIndex, no ancestor in file rename history found.
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188 }
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189 } catch (HgRuntimeException ex) {
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190 checkResult = new Outcome(Outcome.Kind.Failure, phaseMsg, ex);
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191 return checkResult;
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192 }
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193 if (toExtract != null) {
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194 Flags extractRevFlags = cachedManifest.flags(dataFile.getPath());
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195 fileRevision = new HgFileRevision(repo, toExtract, extractRevFlags, dataFile.getPath());
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196 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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197 return checkResult;
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198 }
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199 checkResult = new Outcome(Outcome.Kind.Success, String.format("File %s nor its origins were known at revision %s", file, cset.shortNotation()));
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200 return checkResult;
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201 }
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202
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203 /**
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204 * Re-get latest check status object
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205 */
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206 public Outcome getCheckResult() {
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207 assertCheckRan();
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208 return checkResult;
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209 }
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210
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211 /**
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212 * @return result of the last {@link #check(Path)} call.
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213 */
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214 public boolean exists() {
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215 assertCheckRan();
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216 return fileRevision != null;
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217 }
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218
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219 /**
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220 * @return <code>true</code> if checked file was known by another name at the time of specified changeset.
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221 */
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222 public boolean hasAnotherName() {
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223 assertCheckRan();
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224 return renamed;
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225 }
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227 /**
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228 * @return holder for file revision information
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229 */
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230 public HgFileRevision getFileRevision() {
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231 assertCheckRan();
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232 return fileRevision;
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233 }
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235 /**
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236 * Name of the checked file as it was known at the time of the specified changeset.
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237 *
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238 * @return handy shortcut for <code>getFileRevision().getPath()</code>
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239 */
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240 public Path filename() {
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241 assertCheckRan();
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242 return fileRevision.getPath();
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243 }
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245 /**
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246 * Revision of the checked file
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247 *
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248 * @return handy shortcut for <code>getFileRevision().getRevision()</code>
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249 */
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250 public Nodeid revision() {
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251 assertCheckRan();
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252 return fileRevision.getRevision();
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253 }
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254
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255 private void assertCheckRan() {
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256 if (checkResult == null) {
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257 throw new HgInvalidStateException("Shall invoke #check(Path) first");
248
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258 }
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259 }
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260
248
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261 }