Mercurial > hg4j

annotate src/org/tmatesoft/hg/repo/HgBundle.java @ 176:a8df7162ec75

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Extracting complete branch using remote between call to detect incoming changes is done. Arguments reorderd in remote repo to better match Hg server ideology, not my mental convenience
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Sat, 02 Apr 2011 03:01:14 +0200
parents 71ddbf8603e8
children f26ffe04ced0
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 // shows changes recorded in the bundle that are missing from the supplied repository
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79 public void changes(final HgRepository hgRepo) throws HgException, IOException {
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80 Inspector insp = new Inspector() {
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81 DigestHelper dh = new DigestHelper();
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82 boolean emptyChangelog = true;
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83 private DataAccess prevRevContent;
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85 public void changelogStart() {
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86 emptyChangelog = true;
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88 }
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90 public void changelogEnd() {
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91 if (emptyChangelog) {
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92 throw new IllegalStateException("No changelog group in the bundle"); // XXX perhaps, just be silent and/or log?
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93 }
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94 }
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96 /*
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97 * Despite that BundleFormat wiki says: "Each Changelog entry patches the result of all previous patches
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98 * (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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99 * it seems not to hold true. Instead, each entry patches previous one, regardless of whether the one
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100 * before is its parent (i.e. ge.firstParent()) or not.
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101 *
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102 Actual state in the changelog.i
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103 Index Offset Flags Packed Actual Base Rev Link Rev Parent1 Parent2 nodeid
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104 50: 9212 0 209 329 48 50 49 -1 f1db8610da62a3e0beb8d360556ee1fd6eb9885e
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105 51: 9421 0 278 688 48 51 50 -1 9429c7bd1920fab164a9d2b621d38d57bcb49ae0
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106 52: 9699 0 154 179 52 52 50 -1 30bd389788464287cee22ccff54c330a4b715de5
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107 53: 9853 0 133 204 52 53 51 52 a6f39e595b2b54f56304470269a936ead77f5725
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108 54: 9986 0 156 182 54 54 52 -1 fd4f2c98995beb051070630c272a9be87bef617d
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109
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110 Excerpt from bundle (nodeid, p1, p2, cs):
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111 f1db8610da62a3e0beb8d360556ee1fd6eb9885e 26e3eeaa39623de552b45ee1f55c14f36460f220 0000000000000000000000000000000000000000 f1db8610da62a3e0beb8d360556ee1fd6eb9885e; patches:4
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112 9429c7bd1920fab164a9d2b621d38d57bcb49ae0 f1db8610da62a3e0beb8d360556ee1fd6eb9885e 0000000000000000000000000000000000000000 9429c7bd1920fab164a9d2b621d38d57bcb49ae0; patches:3
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113 > 30bd389788464287cee22ccff54c330a4b715de5 f1db8610da62a3e0beb8d360556ee1fd6eb9885e 0000000000000000000000000000000000000000 30bd389788464287cee22ccff54c330a4b715de5; patches:3
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114 a6f39e595b2b54f56304470269a936ead77f5725 9429c7bd1920fab164a9d2b621d38d57bcb49ae0 30bd389788464287cee22ccff54c330a4b715de5 a6f39e595b2b54f56304470269a936ead77f5725; patches:3
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115 fd4f2c98995beb051070630c272a9be87bef617d 30bd389788464287cee22ccff54c330a4b715de5 0000000000000000000000000000000000000000 fd4f2c98995beb051070630c272a9be87bef617d; patches:3
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116
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117 To recreate 30bd..e5, one have to take content of 9429..e0, not its p1 f1db..5e
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118 */
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119 public boolean element(GroupElement ge) {
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120 emptyChangelog = false;
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121 HgChangelog changelog = hgRepo.getChangelog();
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122 try {
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123 if (prevRevContent == null) {
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124 if (NULL.equals(ge.firstParent()) && NULL.equals(ge.secondParent())) {
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125 prevRevContent = new ByteArrayDataAccess(new byte[0]);
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126 } else {
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127 final Nodeid base = ge.firstParent();
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128 if (!changelog.isKnown(base) /*only first parent, that's Bundle contract*/) {
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129 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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130 }
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131 ByteArrayChannel bac = new ByteArrayChannel();
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132 changelog.rawContent(base, bac); // FIXME get DataAccess directly, to avoid
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133 // extra byte[] (inside ByteArrayChannel) duplication just for the sake of subsequent ByteArrayDataChannel wrap.
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134 prevRevContent = new ByteArrayDataAccess(bac.toArray());
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135 }
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136 }
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137 //
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138 byte[] csetContent = ge.apply(prevRevContent);
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139 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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140 if (!ge.node().equalsTo(dh.asBinary())) {
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141 throw new IllegalStateException("Integrity check failed on " + bundleFile + ", node:" + ge.node());
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142 }
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143 ByteArrayDataAccess csetDataAccess = new ByteArrayDataAccess(csetContent);
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144 if (changelog.isKnown(ge.node())) {
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145 System.out.print("+");
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146 } else {
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147 System.out.print("-");
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148 }
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149 RawChangeset cs = RawChangeset.parse(csetDataAccess);
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150 System.out.println(cs.toString());
170
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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(insp);
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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 /**
170
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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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diff changeset
219 names.add(name);
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diff changeset
220 System.out.println(name);
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221 }
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diff changeset
222
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diff changeset
223 public void fileEnd(String name) {
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diff changeset
224 }
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diff changeset
225
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diff changeset
226 public boolean element(GroupElement ge) {
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diff changeset
227 try {
8c8e3f372fa1 Towards initial clone: refactor HgBundle to provide slightly higher-level structure of the bundle
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diff changeset
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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diff changeset
229 } catch (Exception ex) {
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diff changeset
230 ex.printStackTrace(); // FIXME
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231 }
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diff changeset
232 return true;
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233 }
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diff changeset
234 }
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diff changeset
235
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diff changeset
236 public void inspectChangelog(Inspector inspector) throws IOException {
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diff changeset
237 if (inspector == null) {
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238 throw new IllegalArgumentException();
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239 }
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diff changeset
240 DataAccess da = getDataStream();
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diff changeset
241 try {
8c8e3f372fa1 Towards initial clone: refactor HgBundle to provide slightly higher-level structure of the bundle
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diff changeset
242 if (da.isEmpty()) {
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diff changeset
243 return;
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244 }
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diff changeset
245 inspector.changelogStart();
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diff changeset
246 readGroup(da, inspector);
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diff changeset
247 inspector.changelogEnd();
37
e45e75e22523 Parse changesets from bundle's changelog group. Refactor Revlog to provide access to revision's raw content
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diff changeset
248 } finally {
e45e75e22523 Parse changesets from bundle's changelog group. Refactor Revlog to provide access to revision's raw content
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diff changeset
249 da.done();
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diff changeset
250 }
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diff changeset
251 }
e45e75e22523 Parse changesets from bundle's changelog group. Refactor Revlog to provide access to revision's raw content
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diff changeset
252
169
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diff changeset
253 public void inspectManifest(Inspector inspector) throws IOException {
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diff changeset
254 if (inspector == null) {
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diff changeset
255 throw new IllegalArgumentException();
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diff changeset
256 }
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diff changeset
257 DataAccess da = getDataStream();
36
205f9b59b400 Strip parsing logic out from console frontend
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diff changeset
258 try {
169
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diff changeset
259 if (da.isEmpty()) {
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diff changeset
260 return;
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diff changeset
261 }
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diff changeset
262 skipGroup(da); // changelog
36
205f9b59b400 Strip parsing logic out from console frontend
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parents:
diff changeset
263 if (!da.isEmpty()) {
169
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diff changeset
264 inspector.manifestStart();
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diff changeset
265 readGroup(da, inspector);
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diff changeset
266 inspector.manifestEnd();
36
205f9b59b400 Strip parsing logic out from console frontend
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parents:
diff changeset
267 }
205f9b59b400 Strip parsing logic out from console frontend
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diff changeset
268 } finally {
205f9b59b400 Strip parsing logic out from console frontend
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diff changeset
269 da.done();
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parents:
diff changeset
270 }
205f9b59b400 Strip parsing logic out from console frontend
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parents:
diff changeset
271 }
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parents:
diff changeset
272
169
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diff changeset
273 public void inspectFiles(Inspector inspector) throws IOException {
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diff changeset
274 if (inspector == null) {
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diff changeset
275 throw new IllegalArgumentException();
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diff changeset
276 }
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diff changeset
277 DataAccess da = getDataStream();
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diff changeset
278 try {
8c8e3f372fa1 Towards initial clone: refactor HgBundle to provide slightly higher-level structure of the bundle
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diff changeset
279 if (!da.isEmpty()) {
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parents: 157
diff changeset
280 skipGroup(da); // changelog
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diff changeset
281 }
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diff changeset
282 if (!da.isEmpty()) {
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diff changeset
283 skipGroup(da); // manifest
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diff changeset
284 }
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diff changeset
285 while (!da.isEmpty()) {
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parents: 157
diff changeset
286 int fnameLen = da.readInt();
8c8e3f372fa1 Towards initial clone: refactor HgBundle to provide slightly higher-level structure of the bundle
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diff changeset
287 if (fnameLen <= 4) {
8c8e3f372fa1 Towards initial clone: refactor HgBundle to provide slightly higher-level structure of the bundle
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diff changeset
288 break; // null chunk, the last one.
8c8e3f372fa1 Towards initial clone: refactor HgBundle to provide slightly higher-level structure of the bundle
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diff changeset
289 }
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diff changeset
290 byte[] nameBuf = new byte[fnameLen - 4];
8c8e3f372fa1 Towards initial clone: refactor HgBundle to provide slightly higher-level structure of the bundle
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diff changeset
291 da.readBytes(nameBuf, 0, nameBuf.length);
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diff changeset
292 String fname = new String(nameBuf);
8c8e3f372fa1 Towards initial clone: refactor HgBundle to provide slightly higher-level structure of the bundle
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diff changeset
293 inspector.fileStart(fname);
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diff changeset
294 readGroup(da, inspector);
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diff changeset
295 inspector.fileEnd(fname);
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diff changeset
296 }
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diff changeset
297 } finally {
8c8e3f372fa1 Towards initial clone: refactor HgBundle to provide slightly higher-level structure of the bundle
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diff changeset
298 da.done();
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diff changeset
299 }
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diff changeset
300 }
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diff changeset
301
8c8e3f372fa1 Towards initial clone: refactor HgBundle to provide slightly higher-level structure of the bundle
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diff changeset
302 public void inspectAll(Inspector inspector) throws IOException {
8c8e3f372fa1 Towards initial clone: refactor HgBundle to provide slightly higher-level structure of the bundle
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diff changeset
303 if (inspector == null) {
8c8e3f372fa1 Towards initial clone: refactor HgBundle to provide slightly higher-level structure of the bundle
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diff changeset
304 throw new IllegalArgumentException();
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diff changeset
305 }
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diff changeset
306 DataAccess da = getDataStream();
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diff changeset
307 try {
8c8e3f372fa1 Towards initial clone: refactor HgBundle to provide slightly higher-level structure of the bundle
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parents: 157
diff changeset
308 if (da.isEmpty()) {
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diff changeset
309 return;
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diff changeset
310 }
8c8e3f372fa1 Towards initial clone: refactor HgBundle to provide slightly higher-level structure of the bundle
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parents: 157
diff changeset
311 inspector.changelogStart();
8c8e3f372fa1 Towards initial clone: refactor HgBundle to provide slightly higher-level structure of the bundle
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parents: 157
diff changeset
312 readGroup(da, inspector);
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parents: 157
diff changeset
313 inspector.changelogEnd();
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parents: 157
diff changeset
314 //
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parents: 157
diff changeset
315 if (da.isEmpty()) {
8c8e3f372fa1 Towards initial clone: refactor HgBundle to provide slightly higher-level structure of the bundle
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parents: 157
diff changeset
316 return;
8c8e3f372fa1 Towards initial clone: refactor HgBundle to provide slightly higher-level structure of the bundle
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parents: 157
diff changeset
317 }
8c8e3f372fa1 Towards initial clone: refactor HgBundle to provide slightly higher-level structure of the bundle
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parents: 157
diff changeset
318 inspector.manifestStart();
8c8e3f372fa1 Towards initial clone: refactor HgBundle to provide slightly higher-level structure of the bundle
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parents: 157
diff changeset
319 readGroup(da, inspector);
8c8e3f372fa1 Towards initial clone: refactor HgBundle to provide slightly higher-level structure of the bundle
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parents: 157
diff changeset
320 inspector.manifestEnd();
8c8e3f372fa1 Towards initial clone: refactor HgBundle to provide slightly higher-level structure of the bundle
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parents: 157
diff changeset
321 //
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diff changeset
322 while (!da.isEmpty()) {
8c8e3f372fa1 Towards initial clone: refactor HgBundle to provide slightly higher-level structure of the bundle
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parents: 157
diff changeset
323 int fnameLen = da.readInt();
8c8e3f372fa1 Towards initial clone: refactor HgBundle to provide slightly higher-level structure of the bundle
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parents: 157
diff changeset
324 if (fnameLen <= 4) {
8c8e3f372fa1 Towards initial clone: refactor HgBundle to provide slightly higher-level structure of the bundle
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parents: 157
diff changeset
325 break; // null chunk, the last one.
8c8e3f372fa1 Towards initial clone: refactor HgBundle to provide slightly higher-level structure of the bundle
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parents: 157
diff changeset
326 }
8c8e3f372fa1 Towards initial clone: refactor HgBundle to provide slightly higher-level structure of the bundle
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parents: 157
diff changeset
327 byte[] fnameBuf = new byte[fnameLen - 4];
8c8e3f372fa1 Towards initial clone: refactor HgBundle to provide slightly higher-level structure of the bundle
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parents: 157
diff changeset
328 da.readBytes(fnameBuf, 0, fnameBuf.length);
8c8e3f372fa1 Towards initial clone: refactor HgBundle to provide slightly higher-level structure of the bundle
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parents: 157
diff changeset
329 String name = new String(fnameBuf);
8c8e3f372fa1 Towards initial clone: refactor HgBundle to provide slightly higher-level structure of the bundle
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parents: 157
diff changeset
330 inspector.fileStart(name);
8c8e3f372fa1 Towards initial clone: refactor HgBundle to provide slightly higher-level structure of the bundle
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 157
diff changeset
331 readGroup(da, inspector);
8c8e3f372fa1 Towards initial clone: refactor HgBundle to provide slightly higher-level structure of the bundle
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 157
diff changeset
332 inspector.fileEnd(name);
8c8e3f372fa1 Towards initial clone: refactor HgBundle to provide slightly higher-level structure of the bundle
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parents: 157
diff changeset
333 }
8c8e3f372fa1 Towards initial clone: refactor HgBundle to provide slightly higher-level structure of the bundle
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parents: 157
diff changeset
334 } finally {
8c8e3f372fa1 Towards initial clone: refactor HgBundle to provide slightly higher-level structure of the bundle
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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335 da.done();
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336 }
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337 }
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338
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339 private static void readGroup(DataAccess da, Inspector inspector) throws IOException {
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340 int len = da.readInt();
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341 boolean good2go = true;
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342 while (len > 4 && !da.isEmpty() && good2go) {
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343 byte[] nb = new byte[80];
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344 da.readBytes(nb, 0, 80);
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345 int dataLength = len - 84 /* length field + 4 nodeids */;
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346 byte[] data = new byte[dataLength];
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347 da.readBytes(data, 0, dataLength);
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348 DataAccess slice = new ByteArrayDataAccess(data); // XXX in fact, may pass a slicing DataAccess.
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349 // Just need to make sure that we seek to proper location afterwards (where next GroupElement starts),
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350 // regardless whether that slice has read it or not.
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351 GroupElement ge = new GroupElement(nb, slice);
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352 good2go = inspector.element(ge);
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353 slice.done(); // BADA doesn't implement done(), but it could (e.g. free array)
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354 /// 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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355 // implementations out there do not retain GroupElement.rawData()
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356 len = da.isEmpty() ? 0 : da.readInt();
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357 }
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358 // need to skip up to group end if inspector told he don't want to continue with the group,
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359 // because outer code may try to read next group immediately as we return back.
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360 while (len > 4 && !da.isEmpty()) {
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361 da.skip(len - 4 /* length field */);
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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 private static void skipGroup(DataAccess da) throws IOException {
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367 int len = da.readInt();
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368 while (len > 4 && !da.isEmpty()) {
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369 da.skip(len - 4); // sizeof(int)
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370 len = da.isEmpty() ? 0 : da.readInt();
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371 }
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372 }
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373
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374 public static class GroupElement {
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375 private final byte[] header; // byte[80] takes 120 bytes, 4 Nodeids - 192
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376 private final DataAccess dataAccess;
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377 private List<RevlogStream.PatchRecord> patches;
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378
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379 GroupElement(byte[] fourNodeids, DataAccess rawDataAccess) {
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380 assert fourNodeids != null && fourNodeids.length == 80;
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381 header = fourNodeids;
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382 dataAccess = rawDataAccess;
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383 }
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384
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385 public Nodeid node() {
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386 return Nodeid.fromBinary(header, 0);
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387 }
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388
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389 public Nodeid firstParent() {
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390 return Nodeid.fromBinary(header, 20);
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391 }
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392
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393 public Nodeid secondParent() {
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394 return Nodeid.fromBinary(header, 40);
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395 }
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396
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397 public Nodeid cset() { // cs seems to be changeset
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398 return Nodeid.fromBinary(header, 60);
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399 }
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400
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401 public DataAccess rawData() {
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402 return dataAccess;
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403 }
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404
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405 public List<RevlogStream.PatchRecord> patches() throws IOException {
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406 if (patches == null) {
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407 dataAccess.reset();
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408 LinkedList<RevlogStream.PatchRecord> p = new LinkedList<RevlogStream.PatchRecord>();
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409 while (!dataAccess.isEmpty()) {
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410 RevlogStream.PatchRecord pr = RevlogStream.PatchRecord.read(dataAccess);
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411 p.add(pr);
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412 }
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413 patches = p;
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414 }
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415 return patches;
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416 }
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417
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418 public byte[] apply(DataAccess baseContent) throws IOException {
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419 return RevlogStream.apply(baseContent, -1, patches());
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420 }
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421 }
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422 }