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annotate cmdline/org/tmatesoft/hg/console/Incoming.java @ 177:e10225daface

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Use POST for long between queries. Batch between queries (pass multiple pairs to a server) to minimize number thereof
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Sat, 02 Apr 2011 23:05:28 +0200
parents a8df7162ec75
children 62665d8f0686
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.console;
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18
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19 import static org.tmatesoft.hg.core.Nodeid.NULL;
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21 import java.io.File;
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22 import java.net.URL;
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23 import java.util.Arrays;
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24 import java.util.Collections;
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25 import java.util.Comparator;
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26 import java.util.HashMap;
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27 import java.util.HashSet;
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28 import java.util.Iterator;
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29 import java.util.LinkedHashMap;
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30 import java.util.LinkedList;
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31 import java.util.List;
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32 import java.util.Map;
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33 import java.util.Map.Entry;
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34
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35 import org.tmatesoft.hg.core.HgBadStateException;
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36 import org.tmatesoft.hg.core.HgException;
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37 import org.tmatesoft.hg.core.Nodeid;
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38 import org.tmatesoft.hg.internal.ConfigFile;
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39 import org.tmatesoft.hg.internal.Internals;
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40 import org.tmatesoft.hg.repo.HgChangelog;
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41 import org.tmatesoft.hg.repo.HgLookup;
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42 import org.tmatesoft.hg.repo.HgRemoteRepository;
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43 import org.tmatesoft.hg.repo.HgRemoteRepository.Range;
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44 import org.tmatesoft.hg.repo.HgRemoteRepository.RemoteBranch;
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45 import org.tmatesoft.hg.repo.HgRepository;
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47
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48 /**
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49 * WORK IN PROGRESS, DO NOT USE
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50 * hg incoming counterpart
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51 *
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52 * @author Artem Tikhomirov
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53 * @author TMate Software Ltd.
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54 */
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55 public class Incoming {
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57 public static void main(String[] args) throws Exception {
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58 if (Boolean.FALSE.booleanValue()) {
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59 new SequenceConstructor().test();
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60 return;
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61 }
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62 Options cmdLineOpts = Options.parse(args);
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63 HgRepository hgRepo = cmdLineOpts.findRepository();
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64 if (hgRepo.isInvalid()) {
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65 System.err.printf("Can't find repository in: %s\n", hgRepo.getLocation());
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66 return;
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67 }
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68 String key = "svnkit";
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69 ConfigFile cfg = new Internals().newConfigFile();
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70 cfg.addLocation(new File(System.getProperty("user.home"), ".hgrc"));
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71 String server = cfg.getSection("paths").get(key);
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72 if (server == null) {
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73 throw new HgException(String.format("Can't find server %s specification in the config", key));
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74 }
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75 HgRemoteRepository hgRemote = new HgLookup().detect(new URL(server));
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76 //
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77 // in fact, all we need from changelog is set of all nodeids. However, since ParentWalker reuses same Nodeids, it's not too expensive
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78 // to reuse it here, XXX although later this may need to be refactored
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79 final HgChangelog.ParentWalker pw = hgRepo.getChangelog().new ParentWalker();
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80 pw.init();
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81 //
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82 List<RemoteBranch> missingBranches = calculateMissingBranches(hgRepo, hgRemote);
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83 LinkedList<Nodeid> missing = new LinkedList<Nodeid>();
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84 for (RemoteBranch rb : missingBranches) {
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85 List<Nodeid> completeBranch = completeBranch(hgRemote, rb);
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86 // FIXME ensure topologically sorted result
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87 missing.addAll(completeBranch);
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88 }
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89 // Collections.reverse(missing); // useful to test output, from newer to older
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90 for (Nodeid n : missing) {
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91 if (pw.knownNode(n)) {
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92 System.out.println("Erroneous to fetch:" + n);
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93 } else {
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94 System.out.println(n);
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95 }
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96 }
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97 }
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99 private static List<RemoteBranch> calculateMissingBranches(HgRepository hgRepo, HgRemoteRepository hgRemote) {
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100 // FIXME implement
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101 //
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102 // sample 0..52
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103 Nodeid head = Nodeid.fromAscii("30bd389788464287cee22ccff54c330a4b715de5");
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104 Nodeid root = Nodeid.fromAscii("dbd663faec1f0175619cf7668bddc6350548b8d6");
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105 Nodeid p1 = NULL, p2 = NULL;
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106 RemoteBranch fake = new RemoteBranch(head, root, p1, p2);
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107 return Collections.singletonList(fake);
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108 }
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109
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110 // RemoteBranch not necessarily a 'true' remote branch. I use this structure to keep root, head, and root's parents, any
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111 // of them can be known locally, parent might be only one (when I split 'true' RemoteBranch in between because of locally known node
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112 private static List<Nodeid> completeBranch(HgRemoteRepository hgRemote, RemoteBranch rb) throws HgException {
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113 class DataEntry {
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114 public final Nodeid queryHead;
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115 public final int headIndex;
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116 public List<Nodeid> entries;
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117
176
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118 public DataEntry(Nodeid head, int index, List<Nodeid> data) {
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119 queryHead = head;
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120 headIndex = index;
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121 entries = data;
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122 }
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123 };
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124
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125 List<Nodeid> initial = hgRemote.between(rb.head, rb.root);
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126 Nodeid[] result = new Nodeid[1 << initial.size()];
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127 result[0] = rb.head;
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128 int rootIndex = -1; // index in the result, where to place branche's root.
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129 LinkedList<DataEntry> datas = new LinkedList<DataEntry>();
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130 // DataEntry in datas has entries list filled with 'between' data, whereas
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131 // DataEntry in toQuery keeps only nodeid and its index, with entries to be initialized before
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132 // moving to datas.
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133 LinkedList<DataEntry> toQuery = new LinkedList<DataEntry>();
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134 //
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135 datas.add(new DataEntry(rb.head, 0, initial));
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136 int totalQueries = 1;
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137 HashSet<Nodeid> queried = new HashSet<Nodeid>();
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138 while(!datas.isEmpty()) {
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139 // keep record of those planned to be queried next time we call between()
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140 // although may keep these in queried, if really don't want separate collection
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141 HashSet<Nodeid> scheduled = new HashSet<Nodeid>();
176
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142 do {
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143 DataEntry de = datas.removeFirst();
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144 // populate result with discovered elements between de.qiueryRoot and branch's head
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145 for (int i = 1, j = 0; j < de.entries.size(); i = i << 1, j++) {
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146 int idx = de.headIndex + i;
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147 result[idx] = de.entries.get(j);
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148 }
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149 // form next query entries from new unknown elements
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150 if (de.entries.size() > 1) {
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151 /* when entries has only one element, it means de.queryRoot was at head-2 position, and thus
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152 * no new information can be obtained. E.g. when it's 2, it might be case of [0..4] query with
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153 * [1,2] result, and we need one more query to get element 3.
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154 */
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155 for (int i =1, j = 0; j < de.entries.size(); i = i<<1, j++) {
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156 int idx = de.headIndex + i;
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157 Nodeid x = de.entries.get(j);
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158 if (!queried.contains(x) && !scheduled.contains(x) && (rootIndex == -1 || rootIndex - de.headIndex > 1)) {
176
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159 /*queries for elements right before head is senseless, but unless we know head's index, do it anyway*/
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160 toQuery.add(new DataEntry(x, idx, null));
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161 scheduled.add(x);
176
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162 }
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163 }
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164 }
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165 } while (!datas.isEmpty());
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166 if (!toQuery.isEmpty()) {
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167 totalQueries++;
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168 }
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169 // for each query, create an between request range, keep record Range->DataEntry to know range's start index
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170 LinkedList<HgRemoteRepository.Range> betweenBatch = new LinkedList<HgRemoteRepository.Range>();
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171 HashMap<HgRemoteRepository.Range, DataEntry> rangeToEntry = new HashMap<HgRemoteRepository.Range, DataEntry>();
176
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172 for (DataEntry de : toQuery) {
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173 queried.add(de.queryHead);
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174 HgRemoteRepository.Range r = new HgRemoteRepository.Range(rb.root, de.queryHead);
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175 betweenBatch.add(r);
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176 rangeToEntry.put(r, de);
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177 }
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178 if (!betweenBatch.isEmpty()) {
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179 Map<Range, List<Nodeid>> between = hgRemote.between(betweenBatch);
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180 for (Entry<Range, List<Nodeid>> e : between.entrySet()) {
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181 DataEntry de = rangeToEntry.get(e.getKey());
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182 assert de != null;
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183 de.entries = e.getValue();
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184 if (rootIndex == -1 && de.entries.size() == 1) {
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185 // returned sequence of length 1 means we used element from [head-2] as root
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186 int numberOfElementsExcludingRootAndHead = de.headIndex + 1;
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187 rootIndex = numberOfElementsExcludingRootAndHead + 1;
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188 System.out.printf("On query %d found out exact number of missing elements: %d\n", totalQueries, numberOfElementsExcludingRootAndHead);
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189 }
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190 datas.add(de); // queue up to record result and construct further requests
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191 }
177
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192 betweenBatch.clear();
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193 rangeToEntry.clear();
176
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194 }
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195 toQuery.clear();
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196 }
176
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197 if (rootIndex == -1) {
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198 throw new HgBadStateException("Shall not happen, provided between output is correct"); // FIXME
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199 }
176
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200 result[rootIndex] = rb.root;
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201 boolean resultOk = true;
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202 LinkedList<Nodeid> fromRootToHead = new LinkedList<Nodeid>();
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203 for (int i = 0; i <= rootIndex; i++) {
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204 Nodeid n = result[i];
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205 if (n == null) {
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206 System.out.printf("ERROR: element %d wasn't found\n",i);
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207 resultOk = false;
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208 }
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209 fromRootToHead.addFirst(n); // reverse order
31
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210 }
177
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211 System.out.println("Total queries:" + totalQueries);
176
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212 if (!resultOk) {
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213 throw new HgBadStateException("See console for details"); // FIXME
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214 }
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215 return fromRootToHead;
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216 }
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217
173
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218 private static class SequenceConstructor {
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219
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220 private int[] between(int root, int head) {
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221 if (head <= (root+1)) {
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222 return new int[0];
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223 }
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224 System.out.printf("[%d, %d]\t\t", root, head);
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225 int size = 1 + (int) Math.floor(Math.log(head-root - 1) / Math.log(2));
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226 int[] rv = new int[size];
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227 for (int v = 1, i = 0; i < rv.length; i++) {
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228 rv[i] = root + v;
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229 v = v << 1;
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230 }
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231 System.out.println(Arrays.toString(rv));
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232 return rv;
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233 }
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234
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235 public void test() {
176
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236 int root = 0, head = 126;
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237 int[] data = between(root, head); // max number of elements to recover is 2**data.length-1, when head is exactly
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238 // 2**data.length element of the branch.
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239 // In such case, total number of elements in the branch (including head and root, would be 2**data.length+1
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240 int[] finalSequence = new int[1 + (1 << data.length >>> 5)]; // div 32 - total bits to integers, +1 for possible modulus
173
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241 int exactNumberOfElements = -1; // exact number of meaningful bits in finalSequence
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242 LinkedHashMap<Integer, int[]> datas = new LinkedHashMap<Integer, int[]>();
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243 datas.put(root, data);
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244 int totalQueries = 1;
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245 HashSet<Integer> queried = new HashSet<Integer>();
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246 int[] checkSequence = null;
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247 while(!datas.isEmpty()) {
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248 LinkedList<int[]> toQuery = new LinkedList<int[]>();
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249 do {
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250 Iterator<Entry<Integer, int[]>> it = datas.entrySet().iterator();
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251 Entry<Integer, int[]> next = it.next();
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252 int r = next.getKey();
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253 data = next.getValue();
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254 it.remove();
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255 populate(r, head, data, finalSequence);
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256 if (checkSequence != null) {
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257 boolean match = true;
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258 // System.out.println("Try to match:");
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259 for (int i = 0; i < checkSequence.length; i++) {
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260 // System.out.println(i);
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261 // System.out.println("control:" + toBinaryString(checkSequence[i], ' '));
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262 // System.out.println("present:" + toBinaryString(finalSequence[i], ' '));
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263 if (checkSequence[i] != finalSequence[i]) {
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264 match = false;
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265 } else {
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266 match &= true;
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267 }
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268 }
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269 System.out.println(match ? "Match, on query:" + totalQueries : "Didn't match");
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270 }
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271 if (data.length > 1) {
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272 /*queries for elements next to head is senseless, hence data.length check above and head-x below*/
173
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273 for (int x : data) {
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274 if (!queried.contains(x) && head - x > 1) {
173
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275 toQuery.add(new int[] {x, head});
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276 }
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277 }
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278 }
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279 } while (!datas.isEmpty()) ;
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280 if (!toQuery.isEmpty()) {
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281 System.out.println();
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282 totalQueries++;
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283 }
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284 Collections.sort(toQuery, new Comparator<int[]>() {
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285
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286 public int compare(int[] o1, int[] o2) {
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287 return o1[0] < o2[0] ? -1 : (o1[0] == o2[0] ? 0 : 1);
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288 }
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289 });
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290 for (int[] x : toQuery) {
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291 if (!queried.contains(x[0])) {
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292 queried.add(x[0]);
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293 data = between(x[0], x[1]);
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294 if (exactNumberOfElements == -1 && data.length == 1) {
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295 exactNumberOfElements = x[0] + 1;
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296 System.out.printf("On query %d found out exact number of missing elements: %d\n", totalQueries, exactNumberOfElements);
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297 // get a bit sequence of exactNumberOfElements, 0111..110
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298 // to 'and' it with finalSequence later
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299 int totalInts = (exactNumberOfElements + 2 /*heading and tailing zero bits*/) >>> 5;
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300 int trailingBits = (exactNumberOfElements + 2) & 0x1f;
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301 if (trailingBits != 0) {
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302 totalInts++;
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303 }
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304 checkSequence = new int[totalInts];
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305 Arrays.fill(checkSequence, 0xffffffff);
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306 checkSequence[0] &= 0x7FFFFFFF;
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307 if (trailingBits == 0) {
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308 checkSequence[totalInts-1] &= 0xFFFFFFFE;
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309 } else if (trailingBits == 1) {
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310 checkSequence[totalInts-1] = 0;
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311 } else {
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312 // trailingBits include heading and trailing zero bits
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313 int mask = 0x80000000 >> trailingBits-2; // with sign!
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314 checkSequence[totalInts - 1] &= mask;
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315 }
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316 for (int e : checkSequence) {
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317 System.out.print(toBinaryString(e, ' '));
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318 }
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319 System.out.println();
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320 }
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321 datas.put(x[0], data);
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322 }
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323 }
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324 }
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325
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326 System.out.println("Total queries:" + totalQueries);
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327 for (int x : finalSequence) {
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328 System.out.print(toBinaryString(x, ' '));
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329 }
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330 }
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331
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332 private void populate(int root, int head, int[] data, int[] finalSequence) {
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333 for (int i = 1, x = 0; root+i < head; i = i << 1, x++) {
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334 int value = data[x];
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335 int value_check = root+i;
174
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336 if (value != value_check) {
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337 throw new IllegalStateException();
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338 }
173
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339 int wordIx = (root + i) >>> 5;
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340 int bitIx = (root + i) & 0x1f;
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341 finalSequence[wordIx] |= 1 << (31-bitIx);
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342 }
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343 }
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344
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345 private static String toBinaryString(int x, char byteSeparator) {
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346 StringBuilder sb = new StringBuilder(4*8+4);
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347 sb.append(toBinaryString((byte) (x >>> 24)));
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348 sb.append(byteSeparator);
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349 sb.append(toBinaryString((byte) ((x & 0x00ff0000) >>> 16)));
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350 sb.append(byteSeparator);
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351 sb.append(toBinaryString((byte) ((x & 0x00ff00) >>> 8)));
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352 sb.append(byteSeparator);
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353 sb.append(toBinaryString((byte) (x & 0x00ff)));
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354 sb.append(byteSeparator);
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355 return sb.toString();
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356 }
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357
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358 private static String toBinaryString(byte b) {
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359 final String nibbles = "0000000100100011010001010110011110001001101010111100110111101111";
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360 assert nibbles.length() == 16*4;
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361 int x1 = (b >>> 4) & 0x0f, x2 = b & 0x0f;
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362 x1 *= 4; x2 *= 4; // 4 characters per nibble
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363 return nibbles.substring(x1, x1+4).concat(nibbles.substring(x2, x2+4));
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364 }
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365 }
31
346b66add79d Basic lookup for incoming changes
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366 }