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annotate src/org/tmatesoft/hg/repo/HgBundle.java @ 227:0fd10e5016dd

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IOException on empty repository with 40-byte dirstate
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Wed, 25 May 2011 13:13:36 +0200
parents 44a34baabea0
children 9fb50c04f03c
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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49
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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 private int uses = 0;
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79 public HgBundle link() {
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80 uses++;
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81 return this;
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82 }
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83 public void unlink() {
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84 uses--;
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85 if (uses == 0 && bundleFile != null) {
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86 bundleFile.deleteOnExit();
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87 }
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88 }
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89 public boolean inUse() {
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90 return uses > 0;
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91 }
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93 /**
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94 * Get changes recorded in the bundle that are missing from the supplied repository.
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95 * @param hgRepo repository that shall possess base revision for this bundle
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96 * @param inspector callback to get each changeset found
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97 */
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98 public void changes(final HgRepository hgRepo, final HgChangelog.Inspector inspector) throws HgException, IOException {
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99 Inspector bundleInsp = new Inspector() {
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100 DigestHelper dh = new DigestHelper();
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101 boolean emptyChangelog = true;
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102 private DataAccess prevRevContent;
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103 private int revisionIndex;
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105 public void changelogStart() {
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106 emptyChangelog = true;
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107 revisionIndex = 0;
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108 }
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110 public void changelogEnd() {
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111 if (emptyChangelog) {
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112 throw new IllegalStateException("No changelog group in the bundle"); // XXX perhaps, just be silent and/or log?
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113 }
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114 }
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115
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116 /*
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117 * Despite that BundleFormat wiki says: "Each Changelog entry patches the result of all previous patches
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118 * (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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119 * it seems not to hold true. Instead, each entry patches previous one, regardless of whether the one
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120 * before is its parent (i.e. ge.firstParent()) or not.
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121 *
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122 Actual state in the changelog.i
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123 Index Offset Flags Packed Actual Base Rev Link Rev Parent1 Parent2 nodeid
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124 50: 9212 0 209 329 48 50 49 -1 f1db8610da62a3e0beb8d360556ee1fd6eb9885e
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125 51: 9421 0 278 688 48 51 50 -1 9429c7bd1920fab164a9d2b621d38d57bcb49ae0
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126 52: 9699 0 154 179 52 52 50 -1 30bd389788464287cee22ccff54c330a4b715de5
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127 53: 9853 0 133 204 52 53 51 52 a6f39e595b2b54f56304470269a936ead77f5725
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128 54: 9986 0 156 182 54 54 52 -1 fd4f2c98995beb051070630c272a9be87bef617d
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129
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130 Excerpt from bundle (nodeid, p1, p2, cs):
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131 f1db8610da62a3e0beb8d360556ee1fd6eb9885e 26e3eeaa39623de552b45ee1f55c14f36460f220 0000000000000000000000000000000000000000 f1db8610da62a3e0beb8d360556ee1fd6eb9885e; patches:4
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132 9429c7bd1920fab164a9d2b621d38d57bcb49ae0 f1db8610da62a3e0beb8d360556ee1fd6eb9885e 0000000000000000000000000000000000000000 9429c7bd1920fab164a9d2b621d38d57bcb49ae0; patches:3
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133 > 30bd389788464287cee22ccff54c330a4b715de5 f1db8610da62a3e0beb8d360556ee1fd6eb9885e 0000000000000000000000000000000000000000 30bd389788464287cee22ccff54c330a4b715de5; patches:3
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134 a6f39e595b2b54f56304470269a936ead77f5725 9429c7bd1920fab164a9d2b621d38d57bcb49ae0 30bd389788464287cee22ccff54c330a4b715de5 a6f39e595b2b54f56304470269a936ead77f5725; patches:3
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135 fd4f2c98995beb051070630c272a9be87bef617d 30bd389788464287cee22ccff54c330a4b715de5 0000000000000000000000000000000000000000 fd4f2c98995beb051070630c272a9be87bef617d; patches:3
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136
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137 To recreate 30bd..e5, one have to take content of 9429..e0, not its p1 f1db..5e
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138 */
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139 public boolean element(GroupElement ge) {
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140 emptyChangelog = false;
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141 HgChangelog changelog = hgRepo.getChangelog();
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142 try {
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143 if (prevRevContent == null) {
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144 if (NULL.equals(ge.firstParent()) && NULL.equals(ge.secondParent())) {
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145 prevRevContent = new ByteArrayDataAccess(new byte[0]);
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146 } else {
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147 final Nodeid base = ge.firstParent();
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148 if (!changelog.isKnown(base) /*only first parent, that's Bundle contract*/) {
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149 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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150 }
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151 ByteArrayChannel bac = new ByteArrayChannel();
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152 changelog.rawContent(base, bac); // FIXME get DataAccess directly, to avoid
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153 // extra byte[] (inside ByteArrayChannel) duplication just for the sake of subsequent ByteArrayDataChannel wrap.
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154 prevRevContent = new ByteArrayDataAccess(bac.toArray());
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155 }
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156 }
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157 //
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158 byte[] csetContent = ge.apply(prevRevContent);
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159 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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160 if (!ge.node().equalsTo(dh.asBinary())) {
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161 throw new IllegalStateException("Integrity check failed on " + bundleFile + ", node:" + ge.node());
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162 }
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163 ByteArrayDataAccess csetDataAccess = new ByteArrayDataAccess(csetContent);
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164 RawChangeset cs = RawChangeset.parse(csetDataAccess);
182
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165 inspector.next(revisionIndex++, ge.node(), cs);
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166 prevRevContent.done();
169
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167 prevRevContent = csetDataAccess.reset();
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168 } catch (CancelledException ex) {
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169 return false;
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170 } catch (Exception ex) {
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171 throw new HgBadStateException(ex); // FIXME
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172 }
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173 return true;
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174 }
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175
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176 public void manifestStart() {}
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177 public void manifestEnd() {}
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178 public void fileStart(String name) {}
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179 public void fileEnd(String name) {}
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180
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181 };
182
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182 inspectChangelog(bundleInsp);
169
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183 }
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184
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185 public void dump() throws IOException {
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186 Dump dump = new Dump();
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187 inspectAll(dump);
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188 System.out.println("Total files:" + dump.names.size());
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189 for (String s : dump.names) {
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190 System.out.println(s);
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191 }
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192 }
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193
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194 // callback to minimize amount of Strings and Nodeids instantiated
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195 public interface Inspector {
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196 void changelogStart();
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197
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198 void changelogEnd();
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199
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200 void manifestStart();
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201
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202 void manifestEnd();
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203
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204 void fileStart(String name);
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205
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206 void fileEnd(String name);
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207
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208 /**
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209 * XXX desperately need exceptions here
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210 * @param element data element, instance might be reused, don't keep a reference to it or its raw data
169
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211 * @return <code>true</code> to continue
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212 */
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213 boolean element(GroupElement element);
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214 }
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215
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216 public static class Dump implements Inspector {
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217 public final LinkedList<String> names = new LinkedList<String>();
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218
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219 public void changelogStart() {
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220 System.out.println("Changelog group");
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221 }
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222
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223 public void changelogEnd() {
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224 }
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225
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226 public void manifestStart() {
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227 System.out.println("Manifest group");
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228 }
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229
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230 public void manifestEnd() {
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231 }
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232
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233 public void fileStart(String name) {
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234 names.add(name);
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235 System.out.println(name);
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236 }
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237
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238 public void fileEnd(String name) {
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239 }
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240
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241 public boolean element(GroupElement ge) {
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242 try {
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243 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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244 } catch (Exception ex) {
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245 ex.printStackTrace(); // FIXME
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246 }
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247 return true;
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248 }
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249 }
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250
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251 public void inspectChangelog(Inspector inspector) throws IOException {
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252 if (inspector == null) {
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253 throw new IllegalArgumentException();
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254 }
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255 DataAccess da = getDataStream();
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256 try {
182
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257 internalInspectChangelog(da, inspector);
37
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258 } finally {
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259 da.done();
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260 }
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261 }
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262
169
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263 public void inspectManifest(Inspector inspector) throws IOException {
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264 if (inspector == null) {
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265 throw new IllegalArgumentException();
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266 }
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267 DataAccess da = getDataStream();
36
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268 try {
169
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269 if (da.isEmpty()) {
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270 return;
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271 }
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272 skipGroup(da); // changelog
182
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273 internalInspectManifest(da, inspector);
36
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274 } finally {
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275 da.done();
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276 }
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277 }
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278
169
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279 public void inspectFiles(Inspector inspector) throws IOException {
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280 if (inspector == null) {
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281 throw new IllegalArgumentException();
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282 }
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283 DataAccess da = getDataStream();
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284 try {
182
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285 if (da.isEmpty()) {
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286 return;
169
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287 }
182
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288 skipGroup(da); // changelog
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289 if (da.isEmpty()) {
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290 return;
169
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291 }
182
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292 skipGroup(da); // manifest
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293 internalInspectFiles(da, inspector);
169
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294 } finally {
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295 da.done();
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296 }
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297 }
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298
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299 public void inspectAll(Inspector inspector) throws IOException {
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300 if (inspector == null) {
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301 throw new IllegalArgumentException();
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302 }
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303 DataAccess da = getDataStream();
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304 try {
182
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diff changeset
305 internalInspectChangelog(da, inspector);
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diff changeset
306 internalInspectManifest(da, inspector);
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diff changeset
307 internalInspectFiles(da, inspector);
169
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diff changeset
308 } finally {
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diff changeset
309 da.done();
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310 }
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diff changeset
311 }
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312
182
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diff changeset
313 private void internalInspectChangelog(DataAccess da, Inspector inspector) throws IOException {
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diff changeset
314 if (da.isEmpty()) {
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diff changeset
315 return;
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316 }
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317 inspector.changelogStart();
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318 readGroup(da, inspector);
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319 inspector.changelogEnd();
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diff changeset
320 }
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diff changeset
321
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diff changeset
322 private void internalInspectManifest(DataAccess da, Inspector inspector) throws IOException {
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diff changeset
323 if (da.isEmpty()) {
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diff changeset
324 return;
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diff changeset
325 }
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diff changeset
326 inspector.manifestStart();
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diff changeset
327 readGroup(da, inspector);
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diff changeset
328 inspector.manifestEnd();
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diff changeset
329 }
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diff changeset
330
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diff changeset
331 private void internalInspectFiles(DataAccess da, Inspector inspector) throws IOException {
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diff changeset
332 while (!da.isEmpty()) {
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diff changeset
333 int fnameLen = da.readInt();
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diff changeset
334 if (fnameLen <= 4) {
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diff changeset
335 break; // null chunk, the last one.
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diff changeset
336 }
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diff changeset
337 byte[] fnameBuf = new byte[fnameLen - 4];
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diff changeset
338 da.readBytes(fnameBuf, 0, fnameBuf.length);
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diff changeset
339 String name = new String(fnameBuf);
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diff changeset
340 inspector.fileStart(name);
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diff changeset
341 readGroup(da, inspector);
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diff changeset
342 inspector.fileEnd(name);
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343 }
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344 }
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345
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346 private static void readGroup(DataAccess da, Inspector inspector) throws IOException {
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347 int len = da.readInt();
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348 boolean good2go = true;
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349 while (len > 4 && !da.isEmpty() && good2go) {
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350 byte[] nb = new byte[80];
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351 da.readBytes(nb, 0, 80);
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352 int dataLength = len - 84 /* length field + 4 nodeids */;
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353 byte[] data = new byte[dataLength];
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354 da.readBytes(data, 0, dataLength);
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355 DataAccess slice = new ByteArrayDataAccess(data); // XXX in fact, may pass a slicing DataAccess.
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356 // Just need to make sure that we seek to proper location afterwards (where next GroupElement starts),
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357 // regardless whether that slice has read it or not.
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358 GroupElement ge = new GroupElement(nb, slice);
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359 good2go = inspector.element(ge);
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360 slice.done(); // BADA doesn't implement done(), but it could (e.g. free array)
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361 /// 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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362 // implementations out there do not retain GroupElement.rawData()
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363 len = da.isEmpty() ? 0 : da.readInt();
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364 }
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365 // need to skip up to group end if inspector told he don't want to continue with the group,
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366 // because outer code may try to read next group immediately as we return back.
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367 while (len > 4 && !da.isEmpty()) {
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368 da.skip(len - 4 /* length field */);
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369 len = da.isEmpty() ? 0 : da.readInt();
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370 }
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371 }
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372
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373 private static void skipGroup(DataAccess da) throws IOException {
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374 int len = da.readInt();
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375 while (len > 4 && !da.isEmpty()) {
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376 da.skip(len - 4); // sizeof(int)
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377 len = da.isEmpty() ? 0 : da.readInt();
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378 }
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379 }
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380
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381 public static class GroupElement {
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382 private final byte[] header; // byte[80] takes 120 bytes, 4 Nodeids - 192
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383 private final DataAccess dataAccess;
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384 private List<RevlogStream.PatchRecord> patches;
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385
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386 GroupElement(byte[] fourNodeids, DataAccess rawDataAccess) {
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387 assert fourNodeids != null && fourNodeids.length == 80;
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388 header = fourNodeids;
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389 dataAccess = rawDataAccess;
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390 }
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391
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392 public Nodeid node() {
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393 return Nodeid.fromBinary(header, 0);
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394 }
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395
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396 public Nodeid firstParent() {
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397 return Nodeid.fromBinary(header, 20);
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398 }
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399
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400 public Nodeid secondParent() {
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401 return Nodeid.fromBinary(header, 40);
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402 }
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403
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404 public Nodeid cset() { // cs seems to be changeset
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405 return Nodeid.fromBinary(header, 60);
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406 }
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407
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408 public DataAccess rawData() {
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409 return dataAccess;
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410 }
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411
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412 public List<RevlogStream.PatchRecord> patches() throws IOException {
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413 if (patches == null) {
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414 dataAccess.reset();
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415 LinkedList<RevlogStream.PatchRecord> p = new LinkedList<RevlogStream.PatchRecord>();
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416 while (!dataAccess.isEmpty()) {
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417 RevlogStream.PatchRecord pr = RevlogStream.PatchRecord.read(dataAccess);
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418 p.add(pr);
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419 }
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420 patches = p;
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421 }
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422 return patches;
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423 }
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424
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425 public byte[] apply(DataAccess baseContent) throws IOException {
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426 return RevlogStream.apply(baseContent, -1, patches());
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427 }
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428 }
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429 }