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annotate src/org/tmatesoft/hg/core/HgChangeset.java @ 489:9c0138cda59a

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HgRepositoryLock: some javadoc
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Mon, 13 Aug 2012 19:24:29 +0200
parents 7bcfbc255f48
children ba36f66c32b4
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 java.util.ArrayList;
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20 import java.util.Collections;
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21 import java.util.List;
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22 import java.util.Map;
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23
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24 import org.tmatesoft.hg.internal.PhasesHelper;
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25 import org.tmatesoft.hg.repo.HgChangelog;
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26 import org.tmatesoft.hg.repo.HgChangelog.RawChangeset;
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27 import org.tmatesoft.hg.repo.HgPhase;
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28 import org.tmatesoft.hg.repo.HgInvalidStateException;
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29 import org.tmatesoft.hg.repo.HgRepository;
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30 import org.tmatesoft.hg.repo.HgRuntimeException;
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31 import org.tmatesoft.hg.repo.HgStatusCollector;
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32 import org.tmatesoft.hg.repo.HgParentChildMap;
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33 import org.tmatesoft.hg.util.CancelledException;
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34 import org.tmatesoft.hg.util.Path;
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37 /**
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38 * Record in the Mercurial changelog, describing single commit.
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39 *
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40 * Not thread-safe, don't try to read from different threads
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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 HgChangeset implements Cloneable {
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47 // these get initialized
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48 private RawChangeset changeset;
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49 private int revNumber;
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50 private Nodeid nodeid;
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52 class ShareDataStruct {
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53 ShareDataStruct(HgStatusCollector statusCollector, Path.Source pathFactory) {
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54 statusHelper = statusCollector;
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55 pathHelper = pathFactory;
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56 }
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57 public final HgStatusCollector statusHelper;
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58 public final Path.Source pathHelper;
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59
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60 public HgParentChildMap<HgChangelog> parentHelper;
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61 public PhasesHelper phaseHelper;
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62 };
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64 // Helpers/utilities shared among few instances of HgChangeset
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65 private final ShareDataStruct shared;
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67 // these are built on demand
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68 private List<HgFileRevision> modifiedFiles, addedFiles;
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69 private List<Path> deletedFiles;
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70 private byte[] parent1, parent2;
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73 // XXX consider CommandContext with StatusCollector, PathPool etc. Commands optionally get CC through a cons or create new
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74 // and pass it around
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75 /*package-local*/HgChangeset(HgStatusCollector statusCollector, Path.Source pathFactory) {
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76 shared = new ShareDataStruct(statusCollector, pathFactory);
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77 }
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79 /*package-local*/ void init(int localRevNumber, Nodeid nid, RawChangeset rawChangeset) {
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80 revNumber = localRevNumber;
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81 nodeid = nid;
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82 changeset = rawChangeset.clone();
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83 modifiedFiles = addedFiles = null;
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84 deletedFiles = null;
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85 parent1 = parent2 = null;
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86 // keep references to shared (and everything in there: parentHelper, statusHelper, phaseHelper and pathHelper)
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87 }
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89 /*package-local*/ void setParentHelper(HgParentChildMap<HgChangelog> pw) {
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90 if (pw != null) {
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91 if (pw.getRepo() != shared.statusHelper.getRepo()) {
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92 throw new IllegalArgumentException();
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93 }
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94 }
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95 shared.parentHelper = pw;
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96 }
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97
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98 /**
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99 * Index of the changeset in local repository. Note, this number is relevant only for local repositories/operations, use
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100 * {@link Nodeid nodeid} to uniquely identify a revision.
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101 *
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102 * @return index of the changeset revision
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103 */
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104 public int getRevisionIndex() {
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105 return revNumber;
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106 }
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107
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108 /**
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109 * Unique identity of this changeset revision
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110 * @return revision identifier, never <code>null</code>
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111 */
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112 public Nodeid getNodeid() {
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113 return nodeid;
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114 }
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115
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116 /**
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117 * Name of the user who made this commit
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118 * @return author of the commit, never <code>null</code>
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119 */
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120 public String getUser() {
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121 return changeset.user();
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122 }
403
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123
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124 /**
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125 * Commit description
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126 * @return content of the corresponding field in changeset record; empty string if none specified.
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127 */
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128 public String getComment() {
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129 return changeset.comment();
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130 }
403
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131
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132 /**
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133 * Name of the branch this commit was made in. Returns "default" for main branch.
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134 * @return name of the branch, non-empty string
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135 */
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136 public String getBranch() {
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137 return changeset.branch();
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138 }
211
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139
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140 /**
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141 * @return used to be String, now {@link HgDate}, use {@link HgDate#toString()} to get same result as before
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142 */
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143 public HgDate getDate() {
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144 return new HgDate(changeset.date().getTime(), changeset.timezone());
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145 }
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146
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147 /**
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148 * Indicates revision of manifest that tracks state of repository at the moment of this commit.
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149 * Note, may be {@link Nodeid#NULL} in certain scenarios (e.g. first changeset in an empty repository, usually by bogus tools)
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150 *
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151 * @return revision identifier, never <code>null</code>
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152 */
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153 public Nodeid getManifestRevision() {
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154 return changeset.manifest();
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155 }
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156
403
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157 /**
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158 * Lists names of files affected by this commit, as recorded in the changeset itself. Unlike {@link #getAddedFiles()},
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159 * {@link #getModifiedFiles()} and {@link #getRemovedFiles()}, this method doesn't analyze actual changes done
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160 * in the commit, rather extracts value from the changeset record.
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161 *
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162 * List returned by this method may be empty, while aforementioned methods may produce non-empty result.
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163 *
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164 * @return list of filenames, never <code>null</code>
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165 */
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166 public List<Path> getAffectedFiles() {
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167 // reports files as recorded in changelog. Note, merge revisions may have no
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168 // files listed, and thus this method would return empty list, while
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169 // #getModifiedFiles() would return list with merged file(s) (because it uses status to get 'em, not
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170 // what #files() gives).
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171 ArrayList<Path> rv = new ArrayList<Path>(changeset.files().size());
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172 for (String name : changeset.files()) {
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173 rv.add(shared.pathHelper.path(name));
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174 }
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175 return rv;
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176 }
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177
403
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178 /**
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179 * Figures out files and specific revisions thereof that were modified in this commit
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180 *
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181 * @return revisions of files modified in this commit
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182 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em>
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183 */
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184 public List<HgFileRevision> getModifiedFiles() throws HgRuntimeException {
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185 if (modifiedFiles == null) {
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186 initFileChanges();
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187 }
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188 return modifiedFiles;
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189 }
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190
403
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191 /**
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192 * Figures out files added in this commit
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193 *
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194 * @return revisions of files added in this commit
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195 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em>
403
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196 */
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197 public List<HgFileRevision> getAddedFiles() throws HgRuntimeException {
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198 if (addedFiles == null) {
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199 initFileChanges();
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200 }
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201 return addedFiles;
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202 }
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203
403
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204 /**
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205 * Figures out files that were deleted as part of this commit
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206 *
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207 * @return revisions of files deleted in this commit
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208 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em>
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209 */
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210 public List<Path> getRemovedFiles() throws HgRuntimeException {
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211 if (deletedFiles == null) {
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212 initFileChanges();
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213 }
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214 return deletedFiles;
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215 }
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216
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217 public boolean isMerge() throws HgRuntimeException {
195
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218 // p1 == -1 and p2 != -1 is legitimate case
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219 return !(getFirstParentRevision().isNull() || getSecondParentRevision().isNull());
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220 }
124
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221
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222 /**
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223 * @return never <code>null</code>
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224 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em>
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225 */
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226 public Nodeid getFirstParentRevision() throws HgRuntimeException {
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227 if (shared.parentHelper != null) {
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228 return shared.parentHelper.safeFirstParent(nodeid);
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229 }
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230 // read once for both p1 and p2
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231 if (parent1 == null) {
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232 parent1 = new byte[20];
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233 parent2 = new byte[20];
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234 getRepo().getChangelog().parents(revNumber, new int[2], parent1, parent2);
195
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235 }
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236 return Nodeid.fromBinary(parent1, 0);
124
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237 }
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238
274
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239 /**
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240 * @return never <code>null</code>
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241 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em>
274
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242 */
423
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243 public Nodeid getSecondParentRevision() throws HgRuntimeException {
450
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244 if (shared.parentHelper != null) {
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245 return shared.parentHelper.safeSecondParent(nodeid);
195
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246 }
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247 if (parent2 == null) {
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248 parent1 = new byte[20];
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249 parent2 = new byte[20];
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250 getRepo().getChangelog().parents(revNumber, new int[2], parent1, parent2);
195
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251 }
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252 return Nodeid.fromBinary(parent2, 0);
124
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253 }
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254
471
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255 /**
445
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256 * Tells the phase this changeset belongs to.
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257 * @return one of {@link HgPhase} values
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258 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em>
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259 */
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260 public HgPhase getPhase() throws HgRuntimeException {
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261 if (shared.phaseHelper == null) {
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262 // XXX would be handy to obtain ProgressSupport (perhaps, from statusHelper?)
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263 // and pass it to #init(), so that there could be indication of file being read and cache being built
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264 synchronized (shared) {
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265 // ensure field is initialized only once
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266 if (shared.phaseHelper == null) {
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267 shared.phaseHelper = new PhasesHelper(getRepo(), shared.parentHelper);
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268 }
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269 }
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270 }
450
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271 return shared.phaseHelper.getPhase(this);
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272 }
124
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273
403
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274 /**
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275 * Create a copy of this changeset
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276 */
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277 @Override
129
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278 public HgChangeset clone() {
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279 try {
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280 HgChangeset copy = (HgChangeset) super.clone();
196
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281 // copy.changeset references this.changeset, doesn't need own copy
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282 return copy;
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283 } catch (CloneNotSupportedException ex) {
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284 throw new InternalError(ex.toString());
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285 }
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286 }
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287
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288 private HgRepository getRepo() {
450
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289 return shared.statusHelper.getRepo();
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290 }
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291
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292 private /*synchronized*/ void initFileChanges() throws HgRuntimeException {
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293 ArrayList<Path> deleted = new ArrayList<Path>();
231
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294 ArrayList<HgFileRevision> modified = new ArrayList<HgFileRevision>();
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295 ArrayList<HgFileRevision> added = new ArrayList<HgFileRevision>();
94
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296 HgStatusCollector.Record r = new HgStatusCollector.Record();
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297 try {
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298 shared.statusHelper.change(revNumber, r);
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299 } catch (CancelledException ex) {
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300 // Record can't cancel
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301 throw new HgInvalidStateException("Internal error");
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302 }
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303 final HgRepository repo = getRepo();
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304 for (Path s : r.getModified()) {
64
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305 Nodeid nid = r.nodeidAfterChange(s);
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306 if (nid == null) {
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307 throw new HgInvalidStateException(String.format("For the file %s recorded as modified in changeset %d couldn't find revision after change", s, revNumber));
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308 }
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309 modified.add(new HgFileRevision(repo, nid, null, s, null));
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310 }
316
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diff changeset
311 final Map<Path, Path> copied = r.getCopied();
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312 for (Path s : r.getAdded()) {
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313 Nodeid nid = r.nodeidAfterChange(s);
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314 if (nid == null) {
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315 throw new HgInvalidStateException(String.format("For the file %s recorded as added in changeset %d couldn't find revision after change", s, revNumber));
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316 }
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diff changeset
317 added.add(new HgFileRevision(repo, nid, null, s, copied.get(s)));
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318 }
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319 for (Path s : r.getRemoved()) {
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320 // with Path from getRemoved, may just copy
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321 deleted.add(s);
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322 }
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323 modified.trimToSize();
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324 added.trimToSize();
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325 deleted.trimToSize();
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326 modifiedFiles = Collections.unmodifiableList(modified);
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327 addedFiles = Collections.unmodifiableList(added);
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328 deletedFiles = Collections.unmodifiableList(deleted);
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329 }
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330 }