Mercurial > hg4j

annotate src/org/tmatesoft/hg/repo/HgTags.java @ 490:b3c16d1aede0

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Refactoring: move HgRepository's implementation aspects to Internals (which is now its imlementation counterpart and primary repository class to be used by other parts of the library)
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Thu, 16 Aug 2012 17:08:34 +0200
parents 909306e412e2
children d9c07e1432c4
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.repo;
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18
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19 import static org.tmatesoft.hg.util.LogFacility.Severity.Warn;
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20
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21 import java.io.BufferedReader;
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22 import java.io.File;
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23 import java.io.FileReader;
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24 import java.io.IOException;
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25 import java.io.Reader;
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26 import java.util.ArrayList;
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27 import java.util.Collections;
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28 import java.util.HashMap;
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29 import java.util.LinkedList;
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30 import java.util.List;
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31 import java.util.Map;
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32 import java.util.TreeMap;
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34 import org.tmatesoft.hg.core.Nodeid;
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35
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36 /**
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37 * @see http://mercurial.selenic.com/wiki/TagDesign
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38 *
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39 * @author Artem Tikhomirov
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40 * @author TMate Software Ltd.
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41 */
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42 public class HgTags {
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43 // global tags come from ".hgtags"
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44 // local come from ".hg/localtags"
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45
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46 private final HgRepository repo;
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47
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48 private final Map<Nodeid, List<String>> globalToName;
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49 private final Map<Nodeid, List<String>> localToName;
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50 private final Map<String, List<Nodeid>> globalFromName;
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51 private final Map<String, List<Nodeid>> localFromName;
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52
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53 private Map<String, TagInfo> tags;
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54
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55 /*package-local*/ HgTags(HgRepository hgRepo) {
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56 repo = hgRepo;
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57 globalToName = new HashMap<Nodeid, List<String>>();
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58 localToName = new HashMap<Nodeid, List<String>>();
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59 globalFromName = new TreeMap<String, List<Nodeid>>();
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60 localFromName = new TreeMap<String, List<Nodeid>>();
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61 }
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63 /*package-local*/ void readLocal(File localTags) throws IOException {
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64 if (localTags == null || localTags.isDirectory()) {
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65 throw new IllegalArgumentException(String.valueOf(localTags));
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66 }
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67 read(localTags, localToName, localFromName);
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68 }
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69
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70 /*package-local*/ void readGlobal(File globalTags) throws IOException {
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71 if (globalTags == null || globalTags.isDirectory()) {
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72 throw new IllegalArgumentException(String.valueOf(globalTags));
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73 }
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74 read(globalTags, globalToName, globalFromName);
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75 }
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77 /*package-local*/ void readGlobal(Reader globalTags) throws IOException {
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78 BufferedReader r = null;
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79 try {
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80 r = new BufferedReader(globalTags);
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81 read(r, globalToName, globalFromName);
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82 } finally {
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83 if (r != null) {
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84 r.close();
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85 }
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86 }
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87 }
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88
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89 private void read(File f, Map<Nodeid,List<String>> nid2name, Map<String, List<Nodeid>> name2nid) throws IOException {
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90 if (!f.canRead()) {
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91 return;
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92 }
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93 BufferedReader r = null;
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94 try {
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95 r = new BufferedReader(new FileReader(f));
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96 read(r, nid2name, name2nid);
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97 } finally {
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98 if (r != null) {
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99 r.close();
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100 }
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101 }
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102 }
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103
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104 private void read(BufferedReader reader, Map<Nodeid,List<String>> nid2name, Map<String, List<Nodeid>> name2nid) throws IOException {
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105 String line;
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106 while ((line = reader.readLine()) != null) {
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107 line = line.trim();
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108 if (line.length() == 0) {
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109 continue;
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110 }
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111 if (line.length() < 40+2 /*nodeid, space and at least single-char tagname*/) {
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112 repo.getSessionContext().getLog().dump(getClass(), Warn, "Bad tags line: %s", line);
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113 continue;
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114 }
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115 int spacePos = line.indexOf(' ');
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116 if (spacePos != -1) {
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117 assert spacePos == 40;
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118 final byte[] nodeidBytes = line.substring(0, spacePos).getBytes();
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119 Nodeid nid = Nodeid.fromAscii(nodeidBytes, 0, nodeidBytes.length);
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120 String tagName = line.substring(spacePos+1);
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121 List<Nodeid> nids = name2nid.get(tagName);
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122 if (nids == null) {
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123 nids = new LinkedList<Nodeid>();
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124 nids.add(nid);
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125 // tagName is substring of full line, thus need a copy to let the line be GC'ed
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126 // new String(tagName.toCharArray()) is more expressive, but results in 1 extra arraycopy
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127 tagName = new String(tagName);
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128 name2nid.put(tagName, nids);
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129 } else if (!nid.equals(nids.get(0))) {
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130 // Alternatively, !nids.contains(nid) might have come to mind.
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131 // However, I guess that 'tag history' means we need to record each change of revision
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132 // associated with the tag, i.e. imagine project evolution:
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133 // tag1=r1, tag1=r2, tag1=r1. If we choose !contains, list top of tag1 would point to r2
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134 // while we need it to point to r1.
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135 // In fact, there are still possible odd patterns in name2nid list, e.g.
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136 // when tag was removed and added back(initially rev1 tag1, on removal *added* nullrev tag1),
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137 // then added back (rev2 tag1).
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138 // name2nid would list (rev2 nullrev rev1) as many times, as there were revisions of the .hgtags file
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139 // See cpython "v2.4.3c1" revision for example.
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140 // It doesn't seem to hurt (unless there are clients that care about tag history and depend on
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141 // unique revisions there), XXX but better to be fixed (not sure how, though)
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142 ((LinkedList<Nodeid>) nids).addFirst(nid);
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143 // XXX repo.getNodeidCache().nodeid(nid);
104
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144 }
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145 List<String> revTags = nid2name.get(nid);
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146 if (revTags == null) {
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147 revTags = new LinkedList<String>();
234
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148 revTags.add(tagName);
104
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149 nid2name.put(nid, revTags);
234
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150 } else if (!revTags.contains(tagName)) {
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151 // !contains because we don't care about order of the tags per revision
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152 revTags.add(tagName);
104
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153 }
234
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154
104
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155 } else {
490
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156 repo.getSessionContext().getLog().dump(getClass(), Warn, "Bad tags line: %s", line);
104
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157 }
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158 }
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159 }
50
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160
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161 public List<String> tags(Nodeid nid) {
104
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162 ArrayList<String> rv = new ArrayList<String>(5);
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163 List<String> l;
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164 if ((l = localToName.get(nid)) != null) {
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165 rv.addAll(l);
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166 }
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167 if ((l = globalToName.get(nid)) != null) {
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168 rv.addAll(l);
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169 }
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170 return rv;
50
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171 }
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172
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173 public boolean isTagged(Nodeid nid) {
104
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174 return localToName.containsKey(nid) || globalToName.containsKey(nid);
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175 }
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176
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177 public List<Nodeid> tagged(String tagName) {
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178 ArrayList<Nodeid> rv = new ArrayList<Nodeid>(5);
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179 List<Nodeid> l;
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180 if ((l = localFromName.get(tagName)) != null) {
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181 rv.addAll(l);
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182 }
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183 if ((l = globalFromName.get(tagName)) != null) {
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184 rv.addAll(l);
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185 }
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186 return rv;
50
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187 }
344
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188
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189 /**
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190 * All tag entries from the repository, for both active and removed tags
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191 */
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192 public Map<String, TagInfo> getAllTags() {
234
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193 if (tags == null) {
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194 tags = new TreeMap<String, TagInfo>();
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195 for (String t : globalFromName.keySet()) {
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196 tags.put(t, new TagInfo(t));
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197 }
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198 for (String t : localFromName.keySet()) {
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199 tags.put(t, new TagInfo(t));
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200 }
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201 tags = Collections.unmodifiableMap(tags);
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202 }
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203 return tags;
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204 }
344
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205
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206 /**
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207 * Tags that are in use in the repository, unlike {@link #getAllTags()} doesn't list removed tags.
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208 */
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209 public Map<String, TagInfo> getActiveTags() {
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210 TreeMap<String, TagInfo> rv = new TreeMap<String, TagInfo>();
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211 for (Map.Entry<String, TagInfo> e : getAllTags().entrySet()) {
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212 if (!e.getValue().isRemoved()) {
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213 rv.put(e.getKey(), e.getValue());
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214 }
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215 }
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216 return rv;
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217 }
234
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218
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219
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220 public final class TagInfo {
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221 private final String name;
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222 private String branch;
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223
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224 TagInfo(String tagName) {
344
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225 name = tagName;
234
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226 }
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227 public String name() {
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228 return name;
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229 }
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230
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231 public boolean isLocal() {
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232 return localFromName.containsKey(name);
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233 }
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234
354
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235 public String branch() throws HgInvalidControlFileException {
234
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236 if (branch == null) {
367
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237 int x = repo.getChangelog().getRevisionIndex(revision());
234
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238 branch = repo.getChangelog().range(x, x).get(0).branch();
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239 }
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240 return branch;
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241 }
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242 public Nodeid revision() {
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243 if (isLocal()) {
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244 return localFromName.get(name).get(0);
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245 }
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246 return globalFromName.get(name).get(0);
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247 }
344
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248
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249 /**
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250 * @return <code>true</code> if this tag entry describes tag removal
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251 */
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252 public boolean isRemoved() {
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253 return revision().isNull();
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254 }
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b2cfbe46f9b6 HgTags got TagInfo to access tags. Tags are read from all branches/revisions now, not only working copy
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255 }
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f1db8610da62 Log to consult (placeholder, for now) class to find out associated tags
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256 }