Mercurial > jhg
annotate src/org/tmatesoft/hg/repo/HgBundle.java @ 426:063b0663495a
HgManifest#getFileRevisions refactored into #walkFileRevisions to match pattern throught rest of the library
author | Artem Tikhomirov <tikhomirov.artem@gmail.com> |
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date | Wed, 28 Mar 2012 19:34:37 +0200 |
parents | 9c9c442b5f2e |
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1 /* |
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2 * Copyright (c) 2011-2012 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 |
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22 import org.tmatesoft.hg.core.HgBadArgumentException; |
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23 import org.tmatesoft.hg.core.Nodeid; |
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24 import org.tmatesoft.hg.core.SessionContext; |
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25 import org.tmatesoft.hg.internal.ByteArrayChannel; |
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26 import org.tmatesoft.hg.internal.ByteArrayDataAccess; |
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27 import org.tmatesoft.hg.internal.DataAccess; |
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28 import org.tmatesoft.hg.internal.DataAccessProvider; |
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29 import org.tmatesoft.hg.internal.DigestHelper; |
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30 import org.tmatesoft.hg.internal.Experimental; |
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31 import org.tmatesoft.hg.internal.InflaterDataAccess; |
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32 import org.tmatesoft.hg.internal.Patch; |
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33 import org.tmatesoft.hg.repo.HgChangelog.RawChangeset; |
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34 import org.tmatesoft.hg.util.CancelledException; |
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35 |
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36 /** |
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37 * WORK IN PROGRESS |
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38 * |
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39 * @see http://mercurial.selenic.com/wiki/BundleFormat |
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40 * |
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41 * @author Artem Tikhomirov |
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42 * @author TMate Software Ltd. |
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43 */ |
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44 public class HgBundle { |
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45 |
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46 private final File bundleFile; |
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47 private final DataAccessProvider accessProvider; |
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48 // private final SessionContext sessionContext; |
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49 |
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50 HgBundle(SessionContext ctx, DataAccessProvider dap, File bundle) { |
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51 // sessionContext = ctx; |
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52 accessProvider = dap; |
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53 bundleFile = bundle; |
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54 } |
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55 |
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56 private DataAccess getDataStream() throws IOException { |
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57 DataAccess da = accessProvider.create(bundleFile); |
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58 byte[] signature = new byte[6]; |
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59 if (da.length() > 6) { |
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60 da.readBytes(signature, 0, 6); |
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61 if (signature[0] == 'H' && signature[1] == 'G' && signature[2] == '1' && signature[3] == '0') { |
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62 if (signature[4] == 'G' && signature[5] == 'Z') { |
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63 return new InflaterDataAccess(da, 6, da.length() - 6); |
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64 } |
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65 if (signature[4] == 'B' && signature[5] == 'Z') { |
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66 throw HgRepository.notImplemented(); |
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67 } |
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68 if (signature[4] != 'U' || signature[5] != 'N') { |
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69 throw new HgInvalidStateException(String.format("Bad bundle signature: %s", String.valueOf(signature))); |
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70 } |
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71 // "...UN", fall-through |
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72 } else { |
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73 da.reset(); |
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74 } |
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75 } |
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76 return da; |
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77 } |
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78 |
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79 private int uses = 0; |
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80 public HgBundle link() { |
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81 uses++; |
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82 return this; |
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83 } |
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84 public void unlink() { |
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85 uses--; |
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86 if (uses == 0 && bundleFile != null) { |
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87 bundleFile.deleteOnExit(); |
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88 } |
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89 } |
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90 public boolean inUse() { |
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91 return uses > 0; |
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92 } |
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93 |
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94 /** |
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95 * Get changes recorded in the bundle that are missing from the supplied repository. |
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96 * @param hgRepo repository that shall possess base revision for this bundle |
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97 * @param inspector callback to get each changeset found |
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98 */ |
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99 public void changes(final HgRepository hgRepo, final HgChangelog.Inspector inspector) throws HgRuntimeException { |
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100 Inspector bundleInsp = new Inspector() { |
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101 DigestHelper dh = new DigestHelper(); |
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102 boolean emptyChangelog = true; |
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103 private DataAccess prevRevContent; |
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104 private int revisionIndex; |
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105 |
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106 public void changelogStart() { |
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107 emptyChangelog = true; |
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108 revisionIndex = 0; |
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109 } |
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110 |
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111 public void changelogEnd() { |
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112 if (emptyChangelog) { |
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113 throw new IllegalStateException("No changelog group in the bundle"); // XXX perhaps, just be silent and/or log? |
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114 } |
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115 } |
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116 |
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117 /* |
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118 * Despite that BundleFormat wiki says: "Each Changelog entry patches the result of all previous patches |
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119 * (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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120 * it seems not to hold true. Instead, each entry patches previous one, regardless of whether the one |
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121 * before is its parent (i.e. ge.firstParent()) or not. |
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122 * |
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123 Actual state in the changelog.i |
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124 Index Offset Flags Packed Actual Base Rev Link Rev Parent1 Parent2 nodeid |
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125 50: 9212 0 209 329 48 50 49 -1 f1db8610da62a3e0beb8d360556ee1fd6eb9885e |
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126 51: 9421 0 278 688 48 51 50 -1 9429c7bd1920fab164a9d2b621d38d57bcb49ae0 |
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127 52: 9699 0 154 179 52 52 50 -1 30bd389788464287cee22ccff54c330a4b715de5 |
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128 53: 9853 0 133 204 52 53 51 52 a6f39e595b2b54f56304470269a936ead77f5725 |
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129 54: 9986 0 156 182 54 54 52 -1 fd4f2c98995beb051070630c272a9be87bef617d |
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130 |
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131 Excerpt from bundle (nodeid, p1, p2, cs): |
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132 f1db8610da62a3e0beb8d360556ee1fd6eb9885e 26e3eeaa39623de552b45ee1f55c14f36460f220 0000000000000000000000000000000000000000 f1db8610da62a3e0beb8d360556ee1fd6eb9885e; patches:4 |
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133 9429c7bd1920fab164a9d2b621d38d57bcb49ae0 f1db8610da62a3e0beb8d360556ee1fd6eb9885e 0000000000000000000000000000000000000000 9429c7bd1920fab164a9d2b621d38d57bcb49ae0; patches:3 |
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134 > 30bd389788464287cee22ccff54c330a4b715de5 f1db8610da62a3e0beb8d360556ee1fd6eb9885e 0000000000000000000000000000000000000000 30bd389788464287cee22ccff54c330a4b715de5; patches:3 |
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135 a6f39e595b2b54f56304470269a936ead77f5725 9429c7bd1920fab164a9d2b621d38d57bcb49ae0 30bd389788464287cee22ccff54c330a4b715de5 a6f39e595b2b54f56304470269a936ead77f5725; patches:3 |
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136 fd4f2c98995beb051070630c272a9be87bef617d 30bd389788464287cee22ccff54c330a4b715de5 0000000000000000000000000000000000000000 fd4f2c98995beb051070630c272a9be87bef617d; patches:3 |
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137 |
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138 To recreate 30bd..e5, one have to take content of 9429..e0, not its p1 f1db..5e |
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139 */ |
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140 public boolean element(GroupElement ge) { |
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141 emptyChangelog = false; |
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142 HgChangelog changelog = hgRepo.getChangelog(); |
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143 try { |
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144 if (prevRevContent == null) { |
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145 if (ge.firstParent().isNull() && ge.secondParent().isNull()) { |
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146 prevRevContent = new ByteArrayDataAccess(new byte[0]); |
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147 } else { |
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148 final Nodeid base = ge.firstParent(); |
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149 if (!changelog.isKnown(base) /*only first parent, that's Bundle contract*/) { |
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150 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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151 } |
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152 ByteArrayChannel bac = new ByteArrayChannel(); |
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153 changelog.rawContent(base, bac); // TODO post-1.0 get DataAccess directly, to avoid |
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154 // extra byte[] (inside ByteArrayChannel) duplication just for the sake of subsequent ByteArrayDataChannel wrap. |
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155 prevRevContent = new ByteArrayDataAccess(bac.toArray()); |
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156 } |
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157 } |
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158 // |
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159 byte[] csetContent = ge.apply(prevRevContent); |
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160 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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161 if (!ge.node().equalsTo(dh.asBinary())) { |
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162 throw new HgInvalidStateException(String.format("Integrity check failed on %s, node: %s", bundleFile, ge.node().shortNotation())); |
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163 } |
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164 ByteArrayDataAccess csetDataAccess = new ByteArrayDataAccess(csetContent); |
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165 RawChangeset cs = RawChangeset.parse(csetDataAccess); |
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166 inspector.next(revisionIndex++, ge.node(), cs); |
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167 prevRevContent.done(); |
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168 prevRevContent = csetDataAccess.reset(); |
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169 } catch (CancelledException ex) { |
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170 return false; |
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171 } catch (IOException ex) { |
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172 throw new HgInvalidFileException("Invalid bundle file", ex, bundleFile); // TODO post-1.0 revisit exception handling |
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173 } catch (HgBadArgumentException ex) { |
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174 throw new HgInvalidControlFileException("Invalid bundle file", ex, bundleFile); |
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175 } |
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176 return true; |
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177 } |
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178 |
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179 public void manifestStart() {} |
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180 public void manifestEnd() {} |
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181 public void fileStart(String name) {} |
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182 public void fileEnd(String name) {} |
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183 |
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184 }; |
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185 inspectChangelog(bundleInsp); |
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186 } |
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187 |
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188 // callback to minimize amount of Strings and Nodeids instantiated |
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189 public interface Inspector { |
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190 void changelogStart(); |
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191 |
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192 void changelogEnd(); |
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193 |
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194 void manifestStart(); |
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195 |
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196 void manifestEnd(); |
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197 |
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198 void fileStart(String name); |
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199 |
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200 void fileEnd(String name); |
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201 |
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202 /** |
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203 * XXX desperately need exceptions here |
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204 * @param element data element, instance might be reused, don't keep a reference to it or its raw data |
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205 * @return <code>true</code> to continue |
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206 */ |
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207 boolean element(GroupElement element); |
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208 } |
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209 |
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210 /** |
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211 * @param inspector callback to visit changelog entries |
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212 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em> |
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213 * @throws IllegalArgumentException if inspector argument is null |
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214 */ |
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215 public void inspectChangelog(Inspector inspector) throws HgRuntimeException { |
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216 if (inspector == null) { |
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217 throw new IllegalArgumentException(); |
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218 } |
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219 DataAccess da = null; |
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220 try { |
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221 da = getDataStream(); |
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222 internalInspectChangelog(da, inspector); |
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223 } catch (IOException ex) { |
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224 throw new HgInvalidFileException("Bundle.inspectChangelog failed", ex, bundleFile); |
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225 } finally { |
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226 if (da != null) { |
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227 da.done(); |
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228 } |
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229 } |
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230 } |
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231 |
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232 /** |
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233 * @param inspector callback to visit manifest entries |
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234 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em> |
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235 * @throws IllegalArgumentException if inspector argument is null |
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236 */ |
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237 public void inspectManifest(Inspector inspector) throws HgRuntimeException { |
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238 if (inspector == null) { |
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239 throw new IllegalArgumentException(); |
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240 } |
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241 DataAccess da = null; |
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242 try { |
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243 da = getDataStream(); |
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244 if (da.isEmpty()) { |
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245 return; |
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246 } |
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247 skipGroup(da); // changelog |
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248 internalInspectManifest(da, inspector); |
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249 } catch (IOException ex) { |
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250 throw new HgInvalidFileException("Bundle.inspectManifest failed", ex, bundleFile); |
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251 } finally { |
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252 if (da != null) { |
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253 da.done(); |
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254 } |
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255 } |
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256 } |
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257 |
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258 /** |
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259 * @param inspector callback to visit file entries |
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260 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em> |
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261 * @throws IllegalArgumentException if inspector argument is null |
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262 */ |
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263 public void inspectFiles(Inspector inspector) throws HgRuntimeException { |
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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 = null; |
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268 try { |
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269 da = getDataStream(); |
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270 if (da.isEmpty()) { |
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271 return; |
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272 } |
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273 skipGroup(da); // changelog |
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274 if (da.isEmpty()) { |
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275 return; |
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276 } |
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277 skipGroup(da); // manifest |
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278 internalInspectFiles(da, inspector); |
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279 } catch (IOException ex) { |
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280 throw new HgInvalidFileException("Bundle.inspectFiles failed", ex, bundleFile); |
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281 } finally { |
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282 if (da != null) { |
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283 da.done(); |
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284 } |
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285 } |
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286 } |
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287 |
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288 /** |
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289 * @param inspector visit complete bundle (changelog, manifest and file entries) |
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290 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em> |
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291 * @throws IllegalArgumentException if inspector argument is null |
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292 */ |
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293 public void inspectAll(Inspector inspector) throws HgRuntimeException { |
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294 if (inspector == null) { |
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295 throw new IllegalArgumentException(); |
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296 } |
295
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297 DataAccess da = null; |
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298 try { |
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299 da = getDataStream(); |
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300 internalInspectChangelog(da, inspector); |
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301 internalInspectManifest(da, inspector); |
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302 internalInspectFiles(da, inspector); |
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303 } catch (IOException ex) { |
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304 throw new HgInvalidFileException("Bundle.inspectAll failed", ex, bundleFile); |
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305 } finally { |
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306 if (da != null) { |
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307 da.done(); |
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308 } |
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309 } |
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310 } |
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311 |
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312 private void internalInspectChangelog(DataAccess da, Inspector inspector) throws IOException { |
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313 if (da.isEmpty()) { |
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314 return; |
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315 } |
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316 inspector.changelogStart(); |
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317 readGroup(da, inspector); |
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318 inspector.changelogEnd(); |
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319 } |
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320 |
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321 private void internalInspectManifest(DataAccess da, Inspector inspector) throws IOException { |
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322 if (da.isEmpty()) { |
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323 return; |
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324 } |
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325 inspector.manifestStart(); |
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326 readGroup(da, inspector); |
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327 inspector.manifestEnd(); |
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328 } |
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329 |
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330 private void internalInspectFiles(DataAccess da, Inspector inspector) throws IOException { |
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331 while (!da.isEmpty()) { |
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332 int fnameLen = da.readInt(); |
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333 if (fnameLen <= 4) { |
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334 break; // null chunk, the last one. |
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335 } |
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336 byte[] fnameBuf = new byte[fnameLen - 4]; |
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337 da.readBytes(fnameBuf, 0, fnameBuf.length); |
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338 String name = new String(fnameBuf); |
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339 inspector.fileStart(name); |
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340 readGroup(da, inspector); |
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341 inspector.fileEnd(name); |
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342 } |
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343 } |
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344 |
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345 private static void readGroup(DataAccess da, Inspector inspector) throws IOException { |
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346 int len = da.readInt(); |
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347 boolean good2go = true; |
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348 while (len > 4 && !da.isEmpty() && good2go) { |
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349 byte[] nb = new byte[80]; |
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350 da.readBytes(nb, 0, 80); |
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351 int dataLength = len - 84 /* length field + 4 nodeids */; |
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352 byte[] data = new byte[dataLength]; |
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353 da.readBytes(data, 0, dataLength); |
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354 DataAccess slice = new ByteArrayDataAccess(data); // XXX in fact, may pass a slicing DataAccess. |
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355 // Just need to make sure that we seek to proper location afterwards (where next GroupElement starts), |
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356 // regardless whether that slice has read it or not. |
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357 GroupElement ge = new GroupElement(nb, slice); |
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358 good2go = inspector.element(ge); |
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359 slice.done(); // BADA doesn't implement done(), but it could (e.g. free array) |
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360 /// 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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361 // implementations out there do not retain GroupElement.rawData() |
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362 len = da.isEmpty() ? 0 : da.readInt(); |
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363 } |
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364 // need to skip up to group end if inspector told he don't want to continue with the group, |
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365 // because outer code may try to read next group immediately as we return back. |
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366 while (len > 4 && !da.isEmpty()) { |
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367 da.skip(len - 4 /* length field */); |
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368 len = da.isEmpty() ? 0 : da.readInt(); |
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369 } |
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370 } |
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371 |
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372 private static void skipGroup(DataAccess da) throws IOException { |
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373 int len = da.readInt(); |
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374 while (len > 4 && !da.isEmpty()) { |
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375 da.skip(len - 4); // sizeof(int) |
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376 len = da.isEmpty() ? 0 : da.readInt(); |
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377 } |
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378 } |
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379 |
358
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380 @Experimental(reason="Cumbersome API, rawData and apply with byte[] perhaps need replacement with ByteChannel/ByteBuffer, and better Exceptions. Perhaps, shall split into interface and impl") |
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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 Patch 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 |
358
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392 /** |
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393 * <b>node</b> field of the group element |
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394 * @return node revision, never <code>null</code> |
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395 */ |
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396 public Nodeid node() { |
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397 return Nodeid.fromBinary(header, 0); |
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398 } |
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399 |
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400 /** |
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401 * <b>p1</b> <i>(parent 1)</i> field of the group element |
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402 * @return revision of parent 1, never <code>null</code> |
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403 */ |
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404 public Nodeid firstParent() { |
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405 return Nodeid.fromBinary(header, 20); |
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406 } |
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407 |
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408 /** |
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409 * <b>p2</b> <i>(parent 2)</i> field of the group element |
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410 * @return revision of parent 2, never <code>null</code> |
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411 */ |
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412 public Nodeid secondParent() { |
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413 return Nodeid.fromBinary(header, 40); |
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414 } |
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415 |
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416 /** |
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417 * <b>cs</b> <i>(changeset link)</i> field of the group element |
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418 * @return changeset revision, never <code>null</code> |
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419 */ |
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420 public Nodeid cset() { |
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421 return Nodeid.fromBinary(header, 60); |
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422 } |
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423 |
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424 public byte[] rawDataByteArray() throws IOException { // XXX IOException or HgInvalidFileException? |
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425 return rawData().byteArray(); |
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426 } |
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427 |
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428 public byte[] apply(byte[] baseContent) throws IOException { |
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429 return apply(new ByteArrayDataAccess(baseContent)); |
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430 } |
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431 |
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432 /*package-local*/ DataAccess rawData() { |
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433 return dataAccess; |
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434 } |
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435 |
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436 /*package-local*/ Patch patch() throws IOException { |
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437 if (patches == null) { |
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438 dataAccess.reset(); |
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439 patches = new Patch(); |
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440 patches.read(dataAccess); |
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441 } |
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442 return patches; |
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443 } |
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444 |
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445 /*package-local*/ byte[] apply(DataAccess baseContent) throws IOException { |
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446 return patch().apply(baseContent, -1); |
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447 } |
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448 |
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449 public String toString() { |
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450 int patchCount; |
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451 try { |
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452 patchCount = patch().count(); |
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453 } catch (IOException ex) { |
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454 ex.printStackTrace(); |
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455 patchCount = -1; |
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456 } |
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457 return String.format("%s %s %s %s; patches:%d\n", node().shortNotation(), firstParent().shortNotation(), secondParent().shortNotation(), cset().shortNotation(), patchCount); |
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458 } |
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459 } |
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460 } |