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annotate src/org/tmatesoft/hg/repo/HgBundle.java @ 340:a54bfe0db959

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author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Thu, 17 Nov 2011 06:16:20 +0100
parents 694ebabb5cb3
children 5f9073eabf06
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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18
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19 import java.io.File;
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20 import java.io.IOException;
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21 import java.util.LinkedList;
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22
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23 import org.tmatesoft.hg.core.HgBadStateException;
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24 import org.tmatesoft.hg.core.HgException;
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25 import org.tmatesoft.hg.core.HgInvalidFileException;
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26 import org.tmatesoft.hg.core.Nodeid;
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27 import org.tmatesoft.hg.internal.ByteArrayChannel;
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28 import org.tmatesoft.hg.internal.ByteArrayDataAccess;
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29 import org.tmatesoft.hg.internal.DataAccess;
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30 import org.tmatesoft.hg.internal.DataAccessProvider;
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31 import org.tmatesoft.hg.internal.DigestHelper;
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32 import org.tmatesoft.hg.internal.InflaterDataAccess;
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33 import org.tmatesoft.hg.internal.Patch;
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34 import org.tmatesoft.hg.repo.HgChangelog.RawChangeset;
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35 import org.tmatesoft.hg.util.CancelledException;
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36
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37 /**
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38 * @see http://mercurial.selenic.com/wiki/BundleFormat
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39 *
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40 * @author Artem Tikhomirov
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41 * @author TMate Software Ltd.
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42 */
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43 public class HgBundle {
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45 private final File bundleFile;
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46 private final DataAccessProvider accessProvider;
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48 HgBundle(DataAccessProvider dap, File bundle) {
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49 accessProvider = dap;
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50 bundleFile = bundle;
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51 }
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53 private DataAccess getDataStream() throws IOException {
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54 DataAccess da = accessProvider.create(bundleFile);
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55 byte[] signature = new byte[6];
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56 if (da.length() > 6) {
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57 da.readBytes(signature, 0, 6);
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58 if (signature[0] == 'H' && signature[1] == 'G' && signature[2] == '1' && signature[3] == '0') {
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59 if (signature[4] == 'G' && signature[5] == 'Z') {
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60 return new InflaterDataAccess(da, 6, da.length() - 6);
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61 }
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62 if (signature[4] == 'B' && signature[5] == 'Z') {
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63 throw HgRepository.notImplemented();
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64 }
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65 if (signature[4] != 'U' || signature[5] != 'N') {
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66 throw new HgBadStateException("Bad bundle signature:" + new String(signature));
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67 }
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68 // "...UN", fall-through
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69 } else {
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70 da.reset();
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71 }
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72 }
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73 return da;
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74 }
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76 private int uses = 0;
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77 public HgBundle link() {
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78 uses++;
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79 return this;
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80 }
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81 public void unlink() {
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82 uses--;
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83 if (uses == 0 && bundleFile != null) {
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84 bundleFile.deleteOnExit();
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85 }
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86 }
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87 public boolean inUse() {
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88 return uses > 0;
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89 }
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90
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91 /**
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92 * Get changes recorded in the bundle that are missing from the supplied repository.
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93 * @param hgRepo repository that shall possess base revision for this bundle
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94 * @param inspector callback to get each changeset found
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95 */
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96 public void changes(final HgRepository hgRepo, final HgChangelog.Inspector inspector) throws HgInvalidFileException {
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97 Inspector bundleInsp = new Inspector() {
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98 DigestHelper dh = new DigestHelper();
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99 boolean emptyChangelog = true;
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100 private DataAccess prevRevContent;
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101 private int revisionIndex;
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102
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103 public void changelogStart() {
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104 emptyChangelog = true;
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105 revisionIndex = 0;
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106 }
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108 public void changelogEnd() {
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109 if (emptyChangelog) {
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110 throw new IllegalStateException("No changelog group in the bundle"); // XXX perhaps, just be silent and/or log?
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111 }
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112 }
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114 /*
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115 * Despite that BundleFormat wiki says: "Each Changelog entry patches the result of all previous patches
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116 * (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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117 * it seems not to hold true. Instead, each entry patches previous one, regardless of whether the one
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118 * before is its parent (i.e. ge.firstParent()) or not.
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119 *
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120 Actual state in the changelog.i
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121 Index Offset Flags Packed Actual Base Rev Link Rev Parent1 Parent2 nodeid
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122 50: 9212 0 209 329 48 50 49 -1 f1db8610da62a3e0beb8d360556ee1fd6eb9885e
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123 51: 9421 0 278 688 48 51 50 -1 9429c7bd1920fab164a9d2b621d38d57bcb49ae0
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124 52: 9699 0 154 179 52 52 50 -1 30bd389788464287cee22ccff54c330a4b715de5
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125 53: 9853 0 133 204 52 53 51 52 a6f39e595b2b54f56304470269a936ead77f5725
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126 54: 9986 0 156 182 54 54 52 -1 fd4f2c98995beb051070630c272a9be87bef617d
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127
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128 Excerpt from bundle (nodeid, p1, p2, cs):
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129 f1db8610da62a3e0beb8d360556ee1fd6eb9885e 26e3eeaa39623de552b45ee1f55c14f36460f220 0000000000000000000000000000000000000000 f1db8610da62a3e0beb8d360556ee1fd6eb9885e; patches:4
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130 9429c7bd1920fab164a9d2b621d38d57bcb49ae0 f1db8610da62a3e0beb8d360556ee1fd6eb9885e 0000000000000000000000000000000000000000 9429c7bd1920fab164a9d2b621d38d57bcb49ae0; patches:3
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131 > 30bd389788464287cee22ccff54c330a4b715de5 f1db8610da62a3e0beb8d360556ee1fd6eb9885e 0000000000000000000000000000000000000000 30bd389788464287cee22ccff54c330a4b715de5; patches:3
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132 a6f39e595b2b54f56304470269a936ead77f5725 9429c7bd1920fab164a9d2b621d38d57bcb49ae0 30bd389788464287cee22ccff54c330a4b715de5 a6f39e595b2b54f56304470269a936ead77f5725; patches:3
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133 fd4f2c98995beb051070630c272a9be87bef617d 30bd389788464287cee22ccff54c330a4b715de5 0000000000000000000000000000000000000000 fd4f2c98995beb051070630c272a9be87bef617d; patches:3
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134
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135 To recreate 30bd..e5, one have to take content of 9429..e0, not its p1 f1db..5e
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136 */
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137 public boolean element(GroupElement ge) {
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138 emptyChangelog = false;
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139 HgChangelog changelog = hgRepo.getChangelog();
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140 try {
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141 if (prevRevContent == null) {
274
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142 if (ge.firstParent().isNull() && ge.secondParent().isNull()) {
169
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143 prevRevContent = new ByteArrayDataAccess(new byte[0]);
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144 } else {
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145 final Nodeid base = ge.firstParent();
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146 if (!changelog.isKnown(base) /*only first parent, that's Bundle contract*/) {
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147 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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148 }
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149 ByteArrayChannel bac = new ByteArrayChannel();
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150 changelog.rawContent(base, bac); // FIXME get DataAccess directly, to avoid
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151 // extra byte[] (inside ByteArrayChannel) duplication just for the sake of subsequent ByteArrayDataChannel wrap.
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152 prevRevContent = new ByteArrayDataAccess(bac.toArray());
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153 }
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154 }
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155 //
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156 byte[] csetContent = ge.apply(prevRevContent);
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157 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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158 if (!ge.node().equalsTo(dh.asBinary())) {
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159 throw new IllegalStateException("Integrity check failed on " + bundleFile + ", node:" + ge.node());
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160 }
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161 ByteArrayDataAccess csetDataAccess = new ByteArrayDataAccess(csetContent);
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162 RawChangeset cs = RawChangeset.parse(csetDataAccess);
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163 inspector.next(revisionIndex++, ge.node(), cs);
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164 prevRevContent.done();
169
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165 prevRevContent = csetDataAccess.reset();
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166 } catch (CancelledException ex) {
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167 return false;
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168 } catch (Exception ex) {
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169 throw new HgBadStateException(ex); // FIXME
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170 }
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171 return true;
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172 }
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173
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174 public void manifestStart() {}
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175 public void manifestEnd() {}
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176 public void fileStart(String name) {}
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177 public void fileEnd(String name) {}
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178
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179 };
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180 inspectChangelog(bundleInsp);
169
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181 }
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182
295
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183 public void dump() throws HgException {
169
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184 Dump dump = new Dump();
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185 inspectAll(dump);
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186 System.out.println("Total files:" + dump.names.size());
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187 for (String s : dump.names) {
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188 System.out.println(s);
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189 }
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190 }
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191
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192 // callback to minimize amount of Strings and Nodeids instantiated
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193 public interface Inspector {
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194 void changelogStart();
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195
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196 void changelogEnd();
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197
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198 void manifestStart();
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199
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200 void manifestEnd();
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201
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202 void fileStart(String name);
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203
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204 void fileEnd(String name);
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205
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206 /**
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207 * XXX desperately need exceptions here
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208 * @param element data element, instance might be reused, don't keep a reference to it or its raw data
169
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209 * @return <code>true</code> to continue
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210 */
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211 boolean element(GroupElement element);
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212 }
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213
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214 public static class Dump implements Inspector {
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215 public final LinkedList<String> names = new LinkedList<String>();
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216
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217 public void changelogStart() {
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218 System.out.println("Changelog group");
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219 }
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220
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221 public void changelogEnd() {
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222 }
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223
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224 public void manifestStart() {
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225 System.out.println("Manifest group");
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226 }
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227
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228 public void manifestEnd() {
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229 }
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230
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231 public void fileStart(String name) {
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232 names.add(name);
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233 System.out.println(name);
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234 }
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235
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236 public void fileEnd(String name) {
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237 }
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238
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239 public boolean element(GroupElement ge) {
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240 try {
329
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241 System.out.printf(" %s %s %s %s; patches:%d\n", ge.node(), ge.firstParent(), ge.secondParent(), ge.cset(), ge.patch().count());
169
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242 } catch (Exception ex) {
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243 ex.printStackTrace(); // FIXME
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244 }
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245 return true;
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246 }
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247 }
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248
295
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249 public void inspectChangelog(Inspector inspector) throws HgInvalidFileException {
169
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250 if (inspector == null) {
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251 throw new IllegalArgumentException();
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252 }
295
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253 DataAccess da = null;
169
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254 try {
295
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255 da = getDataStream();
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256 internalInspectChangelog(da, inspector);
295
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257 } catch (IOException ex) {
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258 throw new HgInvalidFileException("Bundle.inspectChangelog failed", ex, bundleFile);
37
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259 } finally {
295
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260 if (da != null) {
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261 da.done();
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262 }
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263 }
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264 }
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265
295
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266 public void inspectManifest(Inspector inspector) throws HgInvalidFileException {
169
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267 if (inspector == null) {
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268 throw new IllegalArgumentException();
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269 }
295
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270 DataAccess da = null;
36
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271 try {
295
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272 da = getDataStream();
169
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273 if (da.isEmpty()) {
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274 return;
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275 }
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276 skipGroup(da); // changelog
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277 internalInspectManifest(da, inspector);
295
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278 } catch (IOException ex) {
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279 throw new HgInvalidFileException("Bundle.inspectManifest failed", ex, bundleFile);
36
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280 } finally {
295
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281 if (da != null) {
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282 da.done();
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283 }
36
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284 }
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285 }
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286
295
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287 public void inspectFiles(Inspector inspector) throws HgInvalidFileException {
169
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288 if (inspector == null) {
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289 throw new IllegalArgumentException();
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290 }
295
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291 DataAccess da = null;
169
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292 try {
295
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293 da = getDataStream();
182
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294 if (da.isEmpty()) {
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295 return;
169
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296 }
182
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297 skipGroup(da); // changelog
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298 if (da.isEmpty()) {
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299 return;
169
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300 }
182
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301 skipGroup(da); // manifest
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302 internalInspectFiles(da, inspector);
295
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303 } catch (IOException ex) {
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304 throw new HgInvalidFileException("Bundle.inspectFiles failed", ex, bundleFile);
169
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305 } finally {
295
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306 if (da != null) {
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307 da.done();
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308 }
169
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309 }
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310 }
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311
295
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312 public void inspectAll(Inspector inspector) throws HgInvalidFileException {
169
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313 if (inspector == null) {
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314 throw new IllegalArgumentException();
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315 }
295
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316 DataAccess da = null;
169
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317 try {
295
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318 da = getDataStream();
182
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diff changeset
319 internalInspectChangelog(da, inspector);
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320 internalInspectManifest(da, inspector);
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321 internalInspectFiles(da, inspector);
295
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322 } catch (IOException ex) {
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diff changeset
323 throw new HgInvalidFileException("Bundle.inspectAll failed", ex, bundleFile);
169
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324 } finally {
295
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diff changeset
325 if (da != null) {
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diff changeset
326 da.done();
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diff changeset
327 }
169
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diff changeset
328 }
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diff changeset
329 }
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diff changeset
330
182
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diff changeset
331 private void internalInspectChangelog(DataAccess da, Inspector inspector) throws IOException {
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diff changeset
332 if (da.isEmpty()) {
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diff changeset
333 return;
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diff changeset
334 }
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335 inspector.changelogStart();
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diff changeset
336 readGroup(da, inspector);
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diff changeset
337 inspector.changelogEnd();
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diff changeset
338 }
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diff changeset
339
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340 private void internalInspectManifest(DataAccess da, Inspector inspector) throws IOException {
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341 if (da.isEmpty()) {
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342 return;
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343 }
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344 inspector.manifestStart();
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345 readGroup(da, inspector);
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346 inspector.manifestEnd();
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347 }
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348
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349 private void internalInspectFiles(DataAccess da, Inspector inspector) throws IOException {
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350 while (!da.isEmpty()) {
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351 int fnameLen = da.readInt();
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352 if (fnameLen <= 4) {
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353 break; // null chunk, the last one.
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354 }
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355 byte[] fnameBuf = new byte[fnameLen - 4];
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356 da.readBytes(fnameBuf, 0, fnameBuf.length);
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357 String name = new String(fnameBuf);
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358 inspector.fileStart(name);
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359 readGroup(da, inspector);
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360 inspector.fileEnd(name);
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361 }
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362 }
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363
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364 private static void readGroup(DataAccess da, Inspector inspector) throws IOException {
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365 int len = da.readInt();
169
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366 boolean good2go = true;
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367 while (len > 4 && !da.isEmpty() && good2go) {
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368 byte[] nb = new byte[80];
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369 da.readBytes(nb, 0, 80);
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370 int dataLength = len - 84 /* length field + 4 nodeids */;
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371 byte[] data = new byte[dataLength];
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372 da.readBytes(data, 0, dataLength);
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373 DataAccess slice = new ByteArrayDataAccess(data); // XXX in fact, may pass a slicing DataAccess.
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374 // Just need to make sure that we seek to proper location afterwards (where next GroupElement starts),
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375 // regardless whether that slice has read it or not.
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376 GroupElement ge = new GroupElement(nb, slice);
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377 good2go = inspector.element(ge);
170
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378 slice.done(); // BADA doesn't implement done(), but it could (e.g. free array)
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379 /// 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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380 // implementations out there do not retain GroupElement.rawData()
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381 len = da.isEmpty() ? 0 : da.readInt();
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382 }
169
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383 // need to skip up to group end if inspector told he don't want to continue with the group,
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384 // because outer code may try to read next group immediately as we return back.
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385 while (len > 4 && !da.isEmpty()) {
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386 da.skip(len - 4 /* length field */);
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387 len = da.isEmpty() ? 0 : da.readInt();
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388 }
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389 }
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390
169
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391 private static void skipGroup(DataAccess da) throws IOException {
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392 int len = da.readInt();
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393 while (len > 4 && !da.isEmpty()) {
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394 da.skip(len - 4); // sizeof(int)
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395 len = da.isEmpty() ? 0 : da.readInt();
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396 }
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397 }
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398
329
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399 // FIXME GroupElement exposes some internal API!!! (DataAccess)
169
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400 public static class GroupElement {
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401 private final byte[] header; // byte[80] takes 120 bytes, 4 Nodeids - 192
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402 private final DataAccess dataAccess;
329
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403 private Patch patches;
169
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404
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405 GroupElement(byte[] fourNodeids, DataAccess rawDataAccess) {
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406 assert fourNodeids != null && fourNodeids.length == 80;
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407 header = fourNodeids;
169
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408 dataAccess = rawDataAccess;
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409 }
169
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410
274
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411 // non-null
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412 public Nodeid node() {
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413 return Nodeid.fromBinary(header, 0);
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414 }
169
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415
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416 // non-null
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417 public Nodeid firstParent() {
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418 return Nodeid.fromBinary(header, 20);
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419 }
169
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420
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421 // non-null
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422 public Nodeid secondParent() {
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423 return Nodeid.fromBinary(header, 40);
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424 }
169
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425
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426 // non-null
37
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diff changeset
427 public Nodeid cset() { // cs seems to be changeset
36
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428 return Nodeid.fromBinary(header, 60);
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429 }
169
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430
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431 public DataAccess rawData() {
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432 return dataAccess;
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433 }
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diff changeset
434
329
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435 /*package-local*/ Patch patch() throws IOException {
169
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436 if (patches == null) {
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437 dataAccess.reset();
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diff changeset
438 patches = new Patch();
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439 patches.read(dataAccess);
169
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440 }
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441 return patches;
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442 }
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443
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444 public byte[] apply(DataAccess baseContent) throws IOException {
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445 return patch().apply(baseContent, -1);
169
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446 }
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447 }
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448 }