Mercurial > jhg

annotate src/org/tmatesoft/hg/core/HgFileInformer.java @ 284:7232b94f2ae3

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
HgDirstate shall operate with Path instead of String for file names. Use of Pair instead of array of unspecified length for parents.
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Sat, 03 Sep 2011 13:12:13 +0200
parents 9fb50c04f03c
children 6dbbc53fc46d
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.HgRepository;
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22 import org.tmatesoft.hg.util.Path;
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24 /**
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25 * Primary purpose is to provide information about file revisions at specific changeset. Multiple {@link #check(Path)} calls
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26 * are possible once {@link #changeset(Nodeid)} (and optionally, {@link #followRenames(boolean)}) were set.
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27 *
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28 * <p>Sample:
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29 * <pre><code>
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30 * HgFileInformer i = new HgFileInformer(hgRepo).changeset(Nodeid.fromString("<40 digits>")).followRenames(true);
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31 * if (i.check(file)) {
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32 * HgCatCommand catCmd = new HgCatCommand(hgRepo).revision(i.getFileRevision());
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33 * catCmd.execute(...);
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34 * ...
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35 * }
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36 * </pre></code>
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37 *
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38 * @author Artem Tikhomirov
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39 * @author TMate Software Ltd.
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40 */
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41 public class HgFileInformer {
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42
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43 private final HgRepository repo;
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44 private boolean followRenames;
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45 private Nodeid cset;
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46 private ManifestRevision cachedManifest;
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47 private HgFileRevision fileRevision;
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48 private boolean checked, renamed;
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49
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50 public HgFileInformer(HgRepository hgRepo) {
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51 repo = hgRepo;
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52 }
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53
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54 /**
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55 * Select specific changelog revision
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56 *
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57 * @param nid changeset identifier
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58 * @return <code>this</code> for convenience
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59 */
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60 public HgFileInformer changeset(Nodeid nid) {
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61 if (nid == null || nid.isNull()) {
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62 throw new IllegalArgumentException();
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63 }
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64 cset = nid;
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65 cachedManifest = null;
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66 fileRevision = null;
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67 return this;
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68 }
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69
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70 /**
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71 * Whether to check file origins, default is false (look up only the name supplied)
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72 *
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73 * @param follow <code>true</code> to check copy/rename origin of the file if it is a copy.
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74 * @return <code>this</code> for convenience
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75 */
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76 public HgFileInformer followRenames(boolean follow) {
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77 followRenames = follow;
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78 fileRevision = null;
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79 return this;
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80 }
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81
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82 /**
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83 * 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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84 *
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85 * @param file name of the file in question
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86 * @return <code>true</code> if file is known at the selected changeset.
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87 * @throws IllegalArgumentException if {@link #changeset(Nodeid)} not specified or file argument is bad.
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88 */
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89 public boolean check(Path file) { // XXX IStatus instead of boolean?
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90 fileRevision = null;
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91 checked = false;
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92 renamed = false;
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93 if (cset == null || file == null || file.isDirectory()) {
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94 throw new IllegalArgumentException();
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95 }
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96 HgDataFile dataFile = repo.getFileNode(file);
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97 if (!dataFile.exists()) {
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98 return false;
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99 }
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100 if (cachedManifest == null) {
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101 int csetRev = repo.getChangelog().getLocalRevision(cset);
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102 cachedManifest = new ManifestRevision(null, null); // XXX how about context and cached manifest revisions
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103 repo.getManifest().walk(csetRev, csetRev, cachedManifest);
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104 // cachedManifest shall be meaningful - changelog.getLocalRevision above ensures we've got version that exists.
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105 }
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106 Nodeid toExtract = cachedManifest.nodeid(file.toString());
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107 try {
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108 if (toExtract == null && followRenames) {
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109 while (toExtract == null && dataFile.isCopy()) {
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110 renamed = true;
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111 file = dataFile.getCopySourceName();
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112 dataFile = repo.getFileNode(file);
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113 toExtract = cachedManifest.nodeid(file.toString());
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114 }
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115 }
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116 } catch (HgDataStreamException ex) {
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117 ex.printStackTrace(); // XXX log(INFO)
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118 // ignore now, however if there's IStatus retval, might report error with reasonable explanation.
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119 // Perhaps, may add a String reason() method with such info?
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120 }
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121 checked = true;
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122 if (toExtract != null) {
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123 fileRevision = new HgFileRevision(repo, toExtract, dataFile.getPath());
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124 return true;
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125 } // else String.format("File %s nor its origins were not known at repository %s revision", file, cset.shortNotation())
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126 return false;
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127 }
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128
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129 /**
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130 * @return result of the last {@link #check(Path)} call.
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131 */
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132 public boolean exists() {
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133 assertCheckRan();
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134 return fileRevision != null;
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135 }
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136
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137 /**
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138 * @return <code>true</code> if checked file was known by another name at the time of specified changeset.
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139 */
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140 public boolean hasAnotherName() {
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141 assertCheckRan();
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142 return renamed;
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143 }
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144
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145 /**
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146 * @return holder for file revision information
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147 */
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148 public HgFileRevision getFileRevision() {
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149 assertCheckRan();
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150 return fileRevision;
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151 }
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152
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153 /**
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154 * Name of the checked file as it was known at the time of the specified changeset.
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155 *
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156 * @return handy shortcut for <code>getFileRevision().getPath()</code>
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157 */
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158 public Path filename() {
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159 assertCheckRan();
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160 return fileRevision.getPath();
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161 }
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162
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163 /**
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164 * Revision of the checked file
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165 *
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166 * @return handy shortcut for <code>getFileRevision().getRevision()</code>
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167 */
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168 public Nodeid revision() {
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169 assertCheckRan();
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170 return fileRevision.getRevision();
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171 }
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172
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173 private void assertCheckRan() {
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174 if (!checked) {
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175 throw new HgBadStateException("Shall invoke #check(Path) first");
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176 }
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177 }
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178 }