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annotate src/org/tmatesoft/hg/repo/HgTags.java @ 104:54562de502f7

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Preliminary tags implementation
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Fri, 28 Jan 2011 17:51:54 +0100
parents a3a2e5deb320
children b2cfbe46f9b6
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.repo;
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18
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19 import java.io.BufferedReader;
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20 import java.io.File;
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21 import java.io.FileReader;
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22 import java.io.IOException;
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23 import java.util.ArrayList;
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24 import java.util.HashMap;
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25 import java.util.LinkedList;
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26 import java.util.List;
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27 import java.util.Map;
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28 import java.util.TreeMap;
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30 import org.tmatesoft.hg.core.Nodeid;
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31
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32 /**
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33 * @see http://mercurial.selenic.com/wiki/TagDesign
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34 *
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35 * @author Artem Tikhomirov
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36 * @author TMate Software Ltd.
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37 */
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38 public class HgTags {
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39 // global tags come from ".hgtags"
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40 // local come from ".hg/localtags"
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41
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42 private final Map<Nodeid, List<String>> globalToName;
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43 private final Map<Nodeid, List<String>> localToName;
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44 private final Map<String, List<Nodeid>> globalFromName;
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45 private final Map<String, List<Nodeid>> localFromName;
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46
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47
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48 /*package-local*/ HgTags() {
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49 globalToName = new HashMap<Nodeid, List<String>>();
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50 localToName = new HashMap<Nodeid, List<String>>();
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51 globalFromName = new TreeMap<String, List<Nodeid>>();
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52 localFromName = new TreeMap<String, List<Nodeid>>();
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53 }
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54
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55 /*package-local*/ void readLocal(File localTags) throws IOException {
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56 if (localTags == null || localTags.isDirectory()) {
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57 throw new IllegalArgumentException(String.valueOf(localTags));
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58 }
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59 read(localTags, localToName, localFromName);
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60 }
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61
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62 /*package-local*/ void readGlobal(File globalTags) throws IOException {
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63 if (globalTags == null || globalTags.isDirectory()) {
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64 throw new IllegalArgumentException(String.valueOf(globalTags));
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65 }
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66 read(globalTags, globalToName, globalFromName);
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67 }
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68
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69 private void read(File f, Map<Nodeid,List<String>> nid2name, Map<String, List<Nodeid>> name2nid) throws IOException {
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70 if (!f.canRead()) {
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71 return;
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72 }
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73 BufferedReader r = null;
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74 try {
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75 r = new BufferedReader(new FileReader(f));
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76 read(r, nid2name, name2nid);
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77 } finally {
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78 if (r != null) {
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79 r.close();
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80 }
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81 }
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82 }
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83
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84 private void read(BufferedReader reader, Map<Nodeid,List<String>> nid2name, Map<String, List<Nodeid>> name2nid) throws IOException {
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85 String line;
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86 while ((line = reader.readLine()) != null) {
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87 line = line.trim();
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88 if (line.length() == 0) {
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89 continue;
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90 }
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91 if (line.length() < 40+2 /*nodeid, space and at least single-char tagname*/) {
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92 System.out.println("Bad tags line:" + line); // FIXME log or otherwise report (IStatus analog?)
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93 continue;
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94 }
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95 int spacePos = line.indexOf(' ');
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96 if (spacePos != -1) {
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97 assert spacePos == 40;
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98 final byte[] nodeidBytes = line.substring(0, spacePos).getBytes();
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99 Nodeid nid = Nodeid.fromAscii(nodeidBytes, 0, nodeidBytes.length);
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100 String tagName = line.substring(spacePos+1);
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101 List<Nodeid> nids = name2nid.get(tagName);
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102 if (nids == null) {
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103 nids = new LinkedList<Nodeid>();
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104 // tagName is substring of full line, thus need a copy to let the line be GC'ed
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105 // new String(tagName.toCharArray()) is more expressive, but results in 1 extra arraycopy
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106 tagName = new String(tagName);
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107 name2nid.put(tagName, nids);
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108 }
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109 // XXX repo.getNodeidCache().nodeid(nid);
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110 ((LinkedList<Nodeid>) nids).addFirst(nid);
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111 List<String> revTags = nid2name.get(nid);
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112 if (revTags == null) {
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113 revTags = new LinkedList<String>();
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114 nid2name.put(nid, revTags);
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115 }
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116 revTags.add(tagName);
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117 } else {
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118 System.out.println("Bad tags line:" + line); // FIXME see above
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119 }
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120 }
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121 }
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123 public List<String> tags(Nodeid nid) {
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124 ArrayList<String> rv = new ArrayList<String>(5);
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125 List<String> l;
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126 if ((l = localToName.get(nid)) != null) {
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127 rv.addAll(l);
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128 }
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129 if ((l = globalToName.get(nid)) != null) {
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130 rv.addAll(l);
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131 }
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132 return rv;
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133 }
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134
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135 public boolean isTagged(Nodeid nid) {
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136 return localToName.containsKey(nid) || globalToName.containsKey(nid);
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137 }
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138
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139 public List<Nodeid> tagged(String tagName) {
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140 ArrayList<Nodeid> rv = new ArrayList<Nodeid>(5);
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141 List<Nodeid> l;
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142 if ((l = localFromName.get(tagName)) != null) {
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143 rv.addAll(l);
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144 }
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145 if ((l = globalFromName.get(tagName)) != null) {
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146 rv.addAll(l);
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147 }
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148 return rv;
50
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149 }
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150 }