Mercurial > hg4j

annotate src/org/tmatesoft/hg/repo/HgBundle.java @ 184:ec1820f64d2b

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Complete incoming cmdline client, with both lite (revisions) and complete (full changeset) information dump
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Wed, 13 Apr 2011 19:09:10 +0200
parents f26ffe04ced0
children 44a34baabea0
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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19 import static org.tmatesoft.hg.core.Nodeid.NULL;
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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.LinkedList;
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24 import java.util.List;
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26 import org.tmatesoft.hg.core.HgBadStateException;
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27 import org.tmatesoft.hg.core.HgException;
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28 import org.tmatesoft.hg.core.Nodeid;
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29 import org.tmatesoft.hg.internal.ByteArrayChannel;
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30 import org.tmatesoft.hg.internal.ByteArrayDataAccess;
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31 import org.tmatesoft.hg.internal.DataAccess;
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32 import org.tmatesoft.hg.internal.DataAccessProvider;
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33 import org.tmatesoft.hg.internal.DigestHelper;
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34 import org.tmatesoft.hg.internal.InflaterDataAccess;
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35 import org.tmatesoft.hg.internal.RevlogStream;
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36 import org.tmatesoft.hg.repo.HgChangelog.RawChangeset;
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37 import org.tmatesoft.hg.util.CancelledException;
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38
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39 /**
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40 * @see http://mercurial.selenic.com/wiki/BundleFormat
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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 HgBundle {
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46
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47 private final File bundleFile;
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48 private final DataAccessProvider accessProvider;
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50 HgBundle(DataAccessProvider dap, File bundle) {
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51 accessProvider = dap;
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52 bundleFile = bundle;
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53 }
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55 private DataAccess getDataStream() throws IOException {
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56 DataAccess da = accessProvider.create(bundleFile);
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57 byte[] signature = new byte[6];
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58 if (da.length() > 6) {
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59 da.readBytes(signature, 0, 6);
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60 if (signature[0] == 'H' && signature[1] == 'G' && signature[2] == '1' && signature[3] == '0') {
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61 if (signature[4] == 'G' && signature[5] == 'Z') {
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62 return new InflaterDataAccess(da, 6, da.length() - 6);
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63 }
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64 if (signature[4] == 'B' && signature[5] == 'Z') {
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65 throw HgRepository.notImplemented();
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66 }
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67 if (signature[4] != 'U' || signature[5] != 'N') {
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68 throw new HgBadStateException("Bad bundle signature:" + new String(signature));
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69 }
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70 // "...UN", fall-through
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71 } else {
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72 da.reset();
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73 }
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74 }
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75 return da;
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76 }
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78 /**
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79 * Get changes recorded in the bundle that are missing from the supplied repository.
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80 * @param hgRepo repository that shall possess base revision for this bundle
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81 * @param inspector callback to get each changeset found
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82 */
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83 public void changes(final HgRepository hgRepo, final HgChangelog.Inspector inspector) throws HgException, IOException {
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84 Inspector bundleInsp = new Inspector() {
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85 DigestHelper dh = new DigestHelper();
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86 boolean emptyChangelog = true;
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87 private DataAccess prevRevContent;
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88 private int revisionIndex;
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90 public void changelogStart() {
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91 emptyChangelog = true;
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92 revisionIndex = 0;
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93 }
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95 public void changelogEnd() {
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96 if (emptyChangelog) {
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97 throw new IllegalStateException("No changelog group in the bundle"); // XXX perhaps, just be silent and/or log?
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98 }
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99 }
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101 /*
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102 * Despite that BundleFormat wiki says: "Each Changelog entry patches the result of all previous patches
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103 * (the previous, or parent patch of a given patch p is the patch that has a node equal to p's p1 field)",
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104 * it seems not to hold true. Instead, each entry patches previous one, regardless of whether the one
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105 * before is its parent (i.e. ge.firstParent()) or not.
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106 *
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107 Actual state in the changelog.i
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108 Index Offset Flags Packed Actual Base Rev Link Rev Parent1 Parent2 nodeid
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109 50: 9212 0 209 329 48 50 49 -1 f1db8610da62a3e0beb8d360556ee1fd6eb9885e
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110 51: 9421 0 278 688 48 51 50 -1 9429c7bd1920fab164a9d2b621d38d57bcb49ae0
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111 52: 9699 0 154 179 52 52 50 -1 30bd389788464287cee22ccff54c330a4b715de5
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112 53: 9853 0 133 204 52 53 51 52 a6f39e595b2b54f56304470269a936ead77f5725
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113 54: 9986 0 156 182 54 54 52 -1 fd4f2c98995beb051070630c272a9be87bef617d
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114
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115 Excerpt from bundle (nodeid, p1, p2, cs):
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116 f1db8610da62a3e0beb8d360556ee1fd6eb9885e 26e3eeaa39623de552b45ee1f55c14f36460f220 0000000000000000000000000000000000000000 f1db8610da62a3e0beb8d360556ee1fd6eb9885e; patches:4
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117 9429c7bd1920fab164a9d2b621d38d57bcb49ae0 f1db8610da62a3e0beb8d360556ee1fd6eb9885e 0000000000000000000000000000000000000000 9429c7bd1920fab164a9d2b621d38d57bcb49ae0; patches:3
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118 > 30bd389788464287cee22ccff54c330a4b715de5 f1db8610da62a3e0beb8d360556ee1fd6eb9885e 0000000000000000000000000000000000000000 30bd389788464287cee22ccff54c330a4b715de5; patches:3
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119 a6f39e595b2b54f56304470269a936ead77f5725 9429c7bd1920fab164a9d2b621d38d57bcb49ae0 30bd389788464287cee22ccff54c330a4b715de5 a6f39e595b2b54f56304470269a936ead77f5725; patches:3
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120 fd4f2c98995beb051070630c272a9be87bef617d 30bd389788464287cee22ccff54c330a4b715de5 0000000000000000000000000000000000000000 fd4f2c98995beb051070630c272a9be87bef617d; patches:3
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121
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122 To recreate 30bd..e5, one have to take content of 9429..e0, not its p1 f1db..5e
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123 */
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124 public boolean element(GroupElement ge) {
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125 emptyChangelog = false;
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126 HgChangelog changelog = hgRepo.getChangelog();
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127 try {
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128 if (prevRevContent == null) {
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129 if (NULL.equals(ge.firstParent()) && NULL.equals(ge.secondParent())) {
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130 prevRevContent = new ByteArrayDataAccess(new byte[0]);
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131 } else {
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132 final Nodeid base = ge.firstParent();
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133 if (!changelog.isKnown(base) /*only first parent, that's Bundle contract*/) {
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134 throw new IllegalStateException(String.format("Revision %s needs a parent %s, which is missing in the supplied repo %s", ge.node().shortNotation(), base.shortNotation(), hgRepo.toString()));
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135 }
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136 ByteArrayChannel bac = new ByteArrayChannel();
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137 changelog.rawContent(base, bac); // FIXME get DataAccess directly, to avoid
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138 // extra byte[] (inside ByteArrayChannel) duplication just for the sake of subsequent ByteArrayDataChannel wrap.
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139 prevRevContent = new ByteArrayDataAccess(bac.toArray());
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140 }
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141 }
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142 //
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143 byte[] csetContent = ge.apply(prevRevContent);
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144 dh = dh.sha1(ge.firstParent(), ge.secondParent(), csetContent); // XXX ge may give me access to byte[] content of nodeid directly, perhaps, I don't need DH to be friend of Nodeid?
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145 if (!ge.node().equalsTo(dh.asBinary())) {
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146 throw new IllegalStateException("Integrity check failed on " + bundleFile + ", node:" + ge.node());
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147 }
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148 ByteArrayDataAccess csetDataAccess = new ByteArrayDataAccess(csetContent);
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149 RawChangeset cs = RawChangeset.parse(csetDataAccess);
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150 inspector.next(revisionIndex++, ge.node(), cs);
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151 prevRevContent.done();
169
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152 prevRevContent = csetDataAccess.reset();
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153 } catch (CancelledException ex) {
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154 return false;
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155 } catch (Exception ex) {
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156 throw new HgBadStateException(ex); // FIXME
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157 }
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158 return true;
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159 }
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160
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161 public void manifestStart() {}
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162 public void manifestEnd() {}
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163 public void fileStart(String name) {}
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164 public void fileEnd(String name) {}
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165
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166 };
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167 inspectChangelog(bundleInsp);
169
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168 }
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169
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170 public void dump() throws IOException {
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171 Dump dump = new Dump();
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172 inspectAll(dump);
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173 System.out.println("Total files:" + dump.names.size());
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174 for (String s : dump.names) {
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175 System.out.println(s);
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176 }
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177 }
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178
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179 // callback to minimize amount of Strings and Nodeids instantiated
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180 public interface Inspector {
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181 void changelogStart();
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182
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183 void changelogEnd();
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184
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185 void manifestStart();
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186
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187 void manifestEnd();
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188
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189 void fileStart(String name);
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190
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191 void fileEnd(String name);
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192
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193 /**
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194 * XXX desperately need exceptions here
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195 * @param element data element, instance might be reused, don't keep a reference to it or its raw data
169
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196 * @return <code>true</code> to continue
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197 */
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198 boolean element(GroupElement element);
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199 }
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200
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201 public static class Dump implements Inspector {
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202 public final LinkedList<String> names = new LinkedList<String>();
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203
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204 public void changelogStart() {
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205 System.out.println("Changelog group");
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206 }
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207
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208 public void changelogEnd() {
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209 }
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210
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211 public void manifestStart() {
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212 System.out.println("Manifest group");
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213 }
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214
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215 public void manifestEnd() {
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216 }
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217
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218 public void fileStart(String name) {
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219 names.add(name);
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220 System.out.println(name);
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221 }
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222
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223 public void fileEnd(String name) {
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224 }
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225
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226 public boolean element(GroupElement ge) {
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227 try {
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228 System.out.printf(" %s %s %s %s; patches:%d\n", ge.node(), ge.firstParent(), ge.secondParent(), ge.cset(), ge.patches().size());
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229 } catch (Exception ex) {
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230 ex.printStackTrace(); // FIXME
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231 }
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232 return true;
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233 }
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234 }
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235
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236 public void inspectChangelog(Inspector inspector) throws IOException {
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237 if (inspector == null) {
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238 throw new IllegalArgumentException();
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239 }
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240 DataAccess da = getDataStream();
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241 try {
182
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242 internalInspectChangelog(da, inspector);
37
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243 } finally {
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244 da.done();
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245 }
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246 }
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247
169
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248 public void inspectManifest(Inspector inspector) throws IOException {
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249 if (inspector == null) {
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250 throw new IllegalArgumentException();
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251 }
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252 DataAccess da = getDataStream();
36
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253 try {
169
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254 if (da.isEmpty()) {
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255 return;
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256 }
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257 skipGroup(da); // changelog
182
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258 internalInspectManifest(da, inspector);
36
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259 } finally {
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260 da.done();
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261 }
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262 }
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263
169
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264 public void inspectFiles(Inspector inspector) throws IOException {
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265 if (inspector == null) {
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266 throw new IllegalArgumentException();
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267 }
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268 DataAccess da = getDataStream();
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269 try {
182
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270 if (da.isEmpty()) {
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271 return;
169
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272 }
182
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273 skipGroup(da); // changelog
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274 if (da.isEmpty()) {
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275 return;
169
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276 }
182
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277 skipGroup(da); // manifest
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278 internalInspectFiles(da, inspector);
169
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279 } finally {
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280 da.done();
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281 }
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282 }
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283
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284 public void inspectAll(Inspector inspector) throws IOException {
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285 if (inspector == null) {
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286 throw new IllegalArgumentException();
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287 }
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288 DataAccess da = getDataStream();
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289 try {
182
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290 internalInspectChangelog(da, inspector);
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291 internalInspectManifest(da, inspector);
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292 internalInspectFiles(da, inspector);
169
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293 } finally {
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294 da.done();
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295 }
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296 }
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297
182
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298 private void internalInspectChangelog(DataAccess da, Inspector inspector) throws IOException {
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299 if (da.isEmpty()) {
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300 return;
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301 }
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302 inspector.changelogStart();
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303 readGroup(da, inspector);
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304 inspector.changelogEnd();
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305 }
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306
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307 private void internalInspectManifest(DataAccess da, Inspector inspector) throws IOException {
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diff changeset
308 if (da.isEmpty()) {
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309 return;
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310 }
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311 inspector.manifestStart();
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312 readGroup(da, inspector);
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313 inspector.manifestEnd();
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314 }
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315
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diff changeset
316 private void internalInspectFiles(DataAccess da, Inspector inspector) throws IOException {
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317 while (!da.isEmpty()) {
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318 int fnameLen = da.readInt();
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diff changeset
319 if (fnameLen <= 4) {
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320 break; // null chunk, the last one.
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diff changeset
321 }
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322 byte[] fnameBuf = new byte[fnameLen - 4];
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diff changeset
323 da.readBytes(fnameBuf, 0, fnameBuf.length);
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324 String name = new String(fnameBuf);
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diff changeset
325 inspector.fileStart(name);
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diff changeset
326 readGroup(da, inspector);
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diff changeset
327 inspector.fileEnd(name);
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diff changeset
328 }
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diff changeset
329 }
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diff changeset
330
169
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diff changeset
331 private static void readGroup(DataAccess da, Inspector inspector) throws IOException {
36
205f9b59b400 Strip parsing logic out from console frontend
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parents:
diff changeset
332 int len = da.readInt();
169
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diff changeset
333 boolean good2go = true;
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diff changeset
334 while (len > 4 && !da.isEmpty() && good2go) {
36
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diff changeset
335 byte[] nb = new byte[80];
205f9b59b400 Strip parsing logic out from console frontend
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diff changeset
336 da.readBytes(nb, 0, 80);
169
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diff changeset
337 int dataLength = len - 84 /* length field + 4 nodeids */;
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diff changeset
338 byte[] data = new byte[dataLength];
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diff changeset
339 da.readBytes(data, 0, dataLength);
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diff changeset
340 DataAccess slice = new ByteArrayDataAccess(data); // XXX in fact, may pass a slicing DataAccess.
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diff changeset
341 // Just need to make sure that we seek to proper location afterwards (where next GroupElement starts),
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diff changeset
342 // regardless whether that slice has read it or not.
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343 GroupElement ge = new GroupElement(nb, slice);
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344 good2go = inspector.element(ge);
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345 slice.done(); // BADA doesn't implement done(), but it could (e.g. free array)
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346 /// and we'd better tell it we are not going to use it any more. However, it's important to ensure Inspector
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347 // implementations out there do not retain GroupElement.rawData()
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348 len = da.isEmpty() ? 0 : da.readInt();
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349 }
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350 // need to skip up to group end if inspector told he don't want to continue with the group,
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351 // because outer code may try to read next group immediately as we return back.
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352 while (len > 4 && !da.isEmpty()) {
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353 da.skip(len - 4 /* length field */);
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354 len = da.isEmpty() ? 0 : da.readInt();
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355 }
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356 }
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357
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358 private static void skipGroup(DataAccess da) throws IOException {
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359 int len = da.readInt();
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360 while (len > 4 && !da.isEmpty()) {
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361 da.skip(len - 4); // sizeof(int)
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362 len = da.isEmpty() ? 0 : da.readInt();
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363 }
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364 }
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365
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366 public static class GroupElement {
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367 private final byte[] header; // byte[80] takes 120 bytes, 4 Nodeids - 192
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368 private final DataAccess dataAccess;
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369 private List<RevlogStream.PatchRecord> patches;
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370
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371 GroupElement(byte[] fourNodeids, DataAccess rawDataAccess) {
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372 assert fourNodeids != null && fourNodeids.length == 80;
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373 header = fourNodeids;
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374 dataAccess = rawDataAccess;
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375 }
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376
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377 public Nodeid node() {
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378 return Nodeid.fromBinary(header, 0);
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379 }
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380
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381 public Nodeid firstParent() {
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382 return Nodeid.fromBinary(header, 20);
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383 }
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384
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385 public Nodeid secondParent() {
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386 return Nodeid.fromBinary(header, 40);
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387 }
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388
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389 public Nodeid cset() { // cs seems to be changeset
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390 return Nodeid.fromBinary(header, 60);
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391 }
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392
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393 public DataAccess rawData() {
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394 return dataAccess;
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395 }
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396
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397 public List<RevlogStream.PatchRecord> patches() throws IOException {
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398 if (patches == null) {
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399 dataAccess.reset();
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400 LinkedList<RevlogStream.PatchRecord> p = new LinkedList<RevlogStream.PatchRecord>();
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401 while (!dataAccess.isEmpty()) {
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402 RevlogStream.PatchRecord pr = RevlogStream.PatchRecord.read(dataAccess);
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403 p.add(pr);
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404 }
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405 patches = p;
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406 }
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407 return patches;
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408 }
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409
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410 public byte[] apply(DataAccess baseContent) throws IOException {
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411 return RevlogStream.apply(baseContent, -1, patches());
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412 }
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413 }
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414 }