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annotate src/org/tmatesoft/hg/repo/ext/MqManager.java @ 480:f3fab7a20841

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Refactor LineReader utility as stanalone class to facilitate reuse
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 17 Jul 2012 22:14:21 +0200
parents 0e34b8f3946a
children b3c16d1aede0
rev   line source
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1 /*
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2 * Copyright (c) 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.ext;
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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.File;
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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.Collections;
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25 import java.util.HashMap;
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26 import java.util.LinkedList;
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27 import java.util.List;
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28 import java.util.Map;
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29
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30 import org.tmatesoft.hg.core.Nodeid;
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31 import org.tmatesoft.hg.internal.LineReader;
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32 import org.tmatesoft.hg.repo.HgInternals;
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33 import org.tmatesoft.hg.repo.HgInvalidControlFileException;
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34 import org.tmatesoft.hg.repo.HgInvalidFileException;
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35 import org.tmatesoft.hg.repo.HgRepository;
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36 import org.tmatesoft.hg.util.LogFacility;
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37 import org.tmatesoft.hg.util.Path;
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38
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39 /**
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40 * Mercurial Queues Support.
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41 * Access to MqExtension functionality.
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42 *
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43 * @author Artem Tikhomirov
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44 * @author TMate Software Ltd.
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45 */
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46 public class MqManager {
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47
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48 private static final String PATCHES_DIR = "patches";
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49
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50 private final HgRepository repo;
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51 private List<PatchRecord> applied = Collections.emptyList();
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52 private List<PatchRecord> allKnown = Collections.emptyList();
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53 private List<String> queueNames = Collections.emptyList();
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54 private String activeQueue = PATCHES_DIR;
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55
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56 public MqManager(HgRepository hgRepo) {
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57 repo = hgRepo;
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58 }
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59
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60 /**
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61 * Updates manager with up-to-date state of the mercurial queues.
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62 */
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63 public void refresh() throws HgInvalidControlFileException {
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64 applied = allKnown = Collections.emptyList();
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65 queueNames = Collections.emptyList();
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66 File repoDir = HgInternals.getRepositoryDir(repo);
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67 final LogFacility log = HgInternals.getContext(repo).getLog();
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68 try {
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69 File queues = new File(repoDir, "patches.queues");
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70 if (queues.isFile()) {
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71 LineReader lr = new LineReader(queues, log).trimLines(true).skipEmpty(true);
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72 lr.read(new LineReader.SimpleLineCollector(), queueNames = new LinkedList<String>());
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73 }
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74 final String queueLocation; // path under .hg to patch queue information (status, series and diff files)
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75 File activeQueueFile = new File(repoDir, "patches.queue");
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76 // file is there only if it's not default queue ('patches') that is active
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77 if (activeQueueFile.isFile()) {
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78 ArrayList<String> contents = new ArrayList<String>();
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79 new LineReader(activeQueueFile, log).read(new LineReader.SimpleLineCollector(), contents);
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80 if (contents.isEmpty()) {
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81 log.dump(getClass(), Warn, "File %s with active queue name is empty", activeQueueFile.getName());
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82 activeQueue = PATCHES_DIR;
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83 queueLocation = PATCHES_DIR + '/';
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84 } else {
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85 activeQueue = contents.get(0);
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86 queueLocation = PATCHES_DIR + '-' + activeQueue + '/';
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87 }
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88 } else {
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89 activeQueue = PATCHES_DIR;
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90 queueLocation = PATCHES_DIR + '/';
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91 }
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92 final Path.Source patchLocation = new Path.Source() {
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93
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94 public Path path(CharSequence p) {
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95 StringBuilder sb = new StringBuilder(64);
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96 sb.append(".hg/");
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97 sb.append(queueLocation);
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98 sb.append(p);
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99 return Path.create(sb);
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100 }
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101 };
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102 final File fileStatus = new File(repoDir, queueLocation + "status");
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103 final File fileSeries = new File(repoDir, queueLocation + "series");
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104 if (fileStatus.isFile()) {
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105 new LineReader(fileStatus, log).read(new LineReader.LineConsumer<List<PatchRecord>>() {
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106
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107 public boolean consume(String line, List<PatchRecord> result) throws IOException {
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108 int sep = line.indexOf(':');
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109 if (sep == -1) {
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110 log.dump(MqManager.class, Warn, "Bad line in %s:%s", fileStatus.getPath(), line);
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111 return true;
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112 }
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113 Nodeid nid = Nodeid.fromAscii(line.substring(0, sep));
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114 String name = new String(line.substring(sep+1));
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115 result.add(new PatchRecord(nid, name, patchLocation.path(name)));
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116 return true;
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117 }
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118 }, applied = new LinkedList<PatchRecord>());
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119 }
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120 if (fileSeries.isFile()) {
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121 final Map<String,PatchRecord> name2patch = new HashMap<String, PatchRecord>();
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122 for (PatchRecord pr : applied) {
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123 name2patch.put(pr.getName(), pr);
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124 }
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125 LinkedList<String> knownPatchNames = new LinkedList<String>();
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126 new LineReader(fileSeries, log).read(new LineReader.SimpleLineCollector(), knownPatchNames);
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127 // XXX read other queues?
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128 allKnown = new ArrayList<PatchRecord>(knownPatchNames.size());
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129 for (String name : knownPatchNames) {
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130 PatchRecord pr = name2patch.get(name);
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131 if (pr == null) {
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132 pr = new PatchRecord(null, name, patchLocation.path(name));
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133 }
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134 allKnown.add(pr);
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135 }
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136 }
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137 } catch (HgInvalidFileException ex) {
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138 HgInvalidControlFileException th = new HgInvalidControlFileException(ex.getMessage(), ex.getCause(), ex.getFile());
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139 th.setStackTrace(ex.getStackTrace());
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140 throw th;
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141 }
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142 }
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143
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144 /**
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145 * Number of patches not yet applied
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146 * @return positive value when there are
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147 */
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148 public int getQueueSize() {
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149 return getAllKnownPatches().size() - getAppliedPatches().size();
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150 }
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151
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152 /**
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153 * Subset of the patches from the queue that were already applied to the repository
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154 * <p>Analog of 'hg qapplied'
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155 *
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156 * <p>Clients shall call {@link #refresh()} prior to first use
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157 * @return collection of records in no particular order, may be empty if none applied
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158 */
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159 public List<PatchRecord> getAppliedPatches() {
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160 return Collections.unmodifiableList(applied);
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161 }
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162
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163 /**
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164 * All of the patches in the active queue that MQ knows about for this repository
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165 *
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166 * <p>Clients shall call {@link #refresh()} prior to first use
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167 * @return collection of records in no particular order, may be empty if there are no patches in the queue
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168 */
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169 public List<PatchRecord> getAllKnownPatches() {
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170 return Collections.unmodifiableList(allKnown);
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171 }
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172
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173 /**
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174 * Name of the patch queue <code>hg qqueue --active</code> which is active now.
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175 * @return patch queue name
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176 */
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177 public String getActiveQueueName() {
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178 return activeQueue;
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179 }
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180
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181 /**
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182 * Patch queues known in the repository, <code>hg qqueue -l</code> analog.
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183 * There's at least one patch queue (default one names 'patches'). Only one patch queue at a time is active.
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184 *
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185 * @return names of patch queues
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186 */
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187 public List<String> getQueueNames() {
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188 return Collections.unmodifiableList(queueNames);
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189 }
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190
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191 public final class PatchRecord {
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192 private final Nodeid nodeid;
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193 private final String name;
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194 private final Path location;
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195
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196 // hashCode/equals might be useful if cons becomes public
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197
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198 PatchRecord(Nodeid revision, String name, Path diffLocation) {
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199 nodeid = revision;
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200 this.name = name;
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201 this.location = diffLocation;
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202 }
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203
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204 /**
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205 * Identifies changeset of the patch that has been applied to the repository
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206 *
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207 * @return changeset revision or <code>null</code> if this patch is not yet applied
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208 */
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209 public Nodeid getRevision() {
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210 return nodeid;
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211 }
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212
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213 /**
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214 * Identifies patch, either based on a user-supplied name (<code>hg qnew <i>patch-name</i></code>) or
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215 * an automatically generated name (like <code><i>revisionIndex</i>.diff</code> for imported changesets).
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216 * Clients shall not rely on this naming scheme, though.
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217 *
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218 * @return never <code>null</code>
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219 */
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220 public String getName() {
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221 return name;
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222 }
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223
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224 /**
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225 * Location of diff file with the patch, relative to repository root
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226 * @return path to the patch, never <code>null</code>
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227 */
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228 public Path getPatchLocation() {
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229 return location;
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230 }
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231
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232 @Override
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233 public String toString() {
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234 String fmt = "mq.PatchRecord[name:%s; %spath:%s]";
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235 String ni = nodeid != null ? String.format("applied as: %s; ", nodeid.shortNotation()) : "";
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236 return String.format(fmt, name, ni, location);
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237 }
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238 }
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239 }