Mercurial > jhg

annotate src/org/tmatesoft/hg/core/HgFileInformer.java @ 355:f2c11fe7f3e9

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Newline filter shall respect whole stream when deciding whether to process line terminators, hence added stream preview functionality
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 06 Dec 2011 12:57:21 +0100
parents 5f9073eabf06
children 8099939af5fa
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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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 *
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41 * @author Artem Tikhomirov
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42 * @author TMate Software Ltd.
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43 */
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44 public class HgFileInformer {
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45
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46 private final HgRepository repo;
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47 private boolean followRenames;
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48 private Nodeid cset;
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49 private ManifestRevision cachedManifest;
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50 private HgFileRevision fileRevision;
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51 private boolean checked, renamed;
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53 public HgFileInformer(HgRepository hgRepo) {
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54 repo = hgRepo;
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55 }
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56
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57 /**
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58 * Select specific changelog revision
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59 *
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60 * @param nid changeset identifier
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61 * @return <code>this</code> for convenience
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62 */
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63 public HgFileInformer changeset(Nodeid nid) {
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64 if (nid == null || nid.isNull()) {
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65 throw new IllegalArgumentException();
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66 }
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67 cset = nid;
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68 cachedManifest = null;
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69 fileRevision = null;
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70 return this;
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71 }
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72
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73 /**
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74 * Whether to check file origins, default is false (look up only the name supplied)
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75 *
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76 * @param follow <code>true</code> to check copy/rename origin of the file if it is a copy.
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77 * @return <code>this</code> for convenience
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78 */
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79 public HgFileInformer followRenames(boolean follow) {
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80 followRenames = follow;
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81 fileRevision = null;
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82 return this;
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83 }
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84
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85 /**
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86 * 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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87 *
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88 * @param file name of the file in question
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89 * @return <code>true</code> if file is known at the selected changeset.
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90 * @throws IllegalArgumentException if {@link #changeset(Nodeid)} not specified or file argument is bad.
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91 */
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92 public boolean check(Path file) throws HgInvalidControlFileException { // XXX IStatus instead of boolean? If status, shall it handle exceptions as well?
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93 fileRevision = null;
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94 checked = false;
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95 renamed = false;
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96 if (cset == null || file == null || file.isDirectory()) {
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97 throw new IllegalArgumentException();
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98 }
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99 HgDataFile dataFile = repo.getFileNode(file);
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100 if (!dataFile.exists()) {
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101 return false;
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102 }
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103 if (cachedManifest == null) {
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104 int csetRev = repo.getChangelog().getLocalRevision(cset);
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105 cachedManifest = new ManifestRevision(null, null); // XXX how about context and cached manifest revisions
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106 repo.getManifest().walk(csetRev, csetRev, cachedManifest);
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107 // cachedManifest shall be meaningful - changelog.getLocalRevision above ensures we've got version that exists.
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108 }
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109 Nodeid toExtract = cachedManifest.nodeid(file);
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110 try {
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111 if (toExtract == null && followRenames) {
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112 while (toExtract == null && dataFile.isCopy()) {
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113 renamed = true;
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114 file = dataFile.getCopySourceName();
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115 dataFile = repo.getFileNode(file);
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116 toExtract = cachedManifest.nodeid(file);
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117 }
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118 }
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119 } catch (HgDataStreamException ex) {
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120 HgInternals.getContext(repo).getLog().warn(getClass(), ex, "Follow copy/rename failed");
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121 // ignore now, however if there's IStatus retval, might report error with reasonable explanation.
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122 // Perhaps, may add a String reason() method with such info?
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123 }
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124 checked = true;
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125 if (toExtract != null) {
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126 fileRevision = new HgFileRevision(repo, toExtract, dataFile.getPath());
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127 return true;
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128 } // else String.format("File %s nor its origins were not known at repository %s revision", file, cset.shortNotation())
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129 return false;
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130 }
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131
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132 /**
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133 * @return result of the last {@link #check(Path)} call.
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134 */
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135 public boolean exists() {
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136 assertCheckRan();
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137 return fileRevision != null;
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138 }
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139
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140 /**
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141 * @return <code>true</code> if checked file was known by another name at the time of specified changeset.
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142 */
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143 public boolean hasAnotherName() {
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144 assertCheckRan();
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145 return renamed;
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146 }
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147
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148 /**
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149 * @return holder for file revision information
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150 */
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151 public HgFileRevision getFileRevision() {
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152 assertCheckRan();
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153 return fileRevision;
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154 }
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155
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156 /**
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157 * Name of the checked file as it was known at the time of the specified changeset.
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158 *
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159 * @return handy shortcut for <code>getFileRevision().getPath()</code>
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160 */
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161 public Path filename() {
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162 assertCheckRan();
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163 return fileRevision.getPath();
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164 }
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165
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166 /**
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167 * Revision of the checked file
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168 *
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169 * @return handy shortcut for <code>getFileRevision().getRevision()</code>
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170 */
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171 public Nodeid revision() {
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172 assertCheckRan();
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173 return fileRevision.getRevision();
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174 }
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175
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176 private void assertCheckRan() {
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177 if (!checked) {
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178 throw new HgBadStateException("Shall invoke #check(Path) first");
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179 }
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180 }
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181 }