Mercurial > hg4j

annotate src/org/tmatesoft/hg/repo/HgBundle.java @ 233:1d389c0cb0a5

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Optimize file history walk not to iterat over whole changelog for sparse and distant revisions
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Fri, 03 Jun 2011 04:50:09 +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 {
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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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305 internalInspectChangelog(da, inspector);
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diff changeset
306 internalInspectManifest(da, inspector);
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307 internalInspectFiles(da, inspector);
169
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308 } finally {
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309 da.done();
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310 }
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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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diff changeset
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 }