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annotate src/org/tmatesoft/hg/repo/HgBundle.java @ 163:a5198b6487dc

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author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Thu, 10 Mar 2011 03:18:49 +0100
parents d5268ca7715b
children 8c8e3f372fa1
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 import java.util.List;
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23
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24 import org.tmatesoft.hg.core.HgException;
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25 import org.tmatesoft.hg.core.Nodeid;
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26 import org.tmatesoft.hg.internal.ByteArrayChannel;
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27 import org.tmatesoft.hg.internal.ByteArrayDataAccess;
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28 import org.tmatesoft.hg.internal.DataAccess;
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29 import org.tmatesoft.hg.internal.DataAccessProvider;
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30 import org.tmatesoft.hg.internal.DigestHelper;
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31 import org.tmatesoft.hg.internal.RevlogStream;
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32 import org.tmatesoft.hg.repo.HgChangelog.RawChangeset;
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33 import org.tmatesoft.hg.util.CancelledException;
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34
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36 /**
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37 * @see http://mercurial.selenic.com/wiki/BundleFormat
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38 *
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39 * @author Artem Tikhomirov
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40 * @author TMate Software Ltd.
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41 */
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42 public class HgBundle {
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43
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44 private final File bundleFile;
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45 private final DataAccessProvider accessProvider;
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47 public HgBundle(DataAccessProvider dap, File bundle) {
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48 accessProvider = dap;
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49 bundleFile = bundle;
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50 }
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51
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52 public void changes(HgRepository hgRepo) throws HgException, IOException {
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53 DataAccess da = accessProvider.create(bundleFile);
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54 DigestHelper dh = new DigestHelper();
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55 try {
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56 List<GroupElement> changelogGroup = readGroup(da);
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57 if (changelogGroup.isEmpty()) {
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58 throw new IllegalStateException("No changelog group in the bundle"); // XXX perhaps, just be silent and/or log?
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59 }
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60 // XXX in fact, bundle not necessarily starts with the first revision missing in hgRepo
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61 // need to 'scroll' till the last one common.
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62 final Nodeid base = changelogGroup.get(0).firstParent();
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63 if (!hgRepo.getChangelog().isKnown(base)) {
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64 throw new IllegalArgumentException("unknown parent");
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65 }
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66 // BundleFormat wiki says:
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67 // Each Changelog entry patches the result of all previous patches
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68 // (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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69 ByteArrayChannel bac = new ByteArrayChannel();
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70 hgRepo.getChangelog().rawContent(base, bac); // FIXME get DataAccess directly, to avoid
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71 // extra byte[] (inside ByteArrayChannel) duplication just for the sake of subsequent ByteArrayDataChannel wrap.
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72 ByteArrayDataAccess baseRevContent = new ByteArrayDataAccess(bac.toArray());
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73 for (GroupElement ge : changelogGroup) {
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74 byte[] csetContent = RevlogStream.apply(baseRevContent, -1, ge.patches);
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75 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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76 if (!ge.node().equalsTo(dh.asBinary())) {
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77 throw new IllegalStateException("Integrity check failed on " + bundleFile + ", node:" + ge.node());
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78 }
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79 ByteArrayDataAccess csetDataAccess = new ByteArrayDataAccess(csetContent);
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80 RawChangeset cs = RawChangeset.parse(csetDataAccess);
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81 System.out.println(cs.toString());
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82 baseRevContent = csetDataAccess.reset();
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83 }
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84 } catch (CancelledException ex) {
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85 System.out.println("Operation cancelled");
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86 } finally {
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87 da.done();
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88 }
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89 }
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91 public void dump() throws IOException {
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92 DataAccess da = accessProvider.create(bundleFile);
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93 try {
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94 LinkedList<String> names = new LinkedList<String>();
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95 if (!da.isEmpty()) {
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96 System.out.println("Changelog group");
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97 List<GroupElement> changelogGroup = readGroup(da);
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98 for (GroupElement ge : changelogGroup) {
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99 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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100 }
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101 System.out.println("Manifest group");
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102 List<GroupElement> manifestGroup = readGroup(da);
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103 for (GroupElement ge : manifestGroup) {
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104 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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105 }
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106 while (!da.isEmpty()) {
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107 int fnameLen = da.readInt();
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108 if (fnameLen <= 4) {
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109 break; // null chunk, the last one.
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110 }
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111 byte[] fname = new byte[fnameLen - 4];
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112 da.readBytes(fname, 0, fname.length);
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113 names.add(new String(fname));
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114 List<GroupElement> fileGroup = readGroup(da);
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115 System.out.println(names.getLast());
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116 for (GroupElement ge : fileGroup) {
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117 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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118 }
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119 }
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120 }
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121 System.out.println(names.size());
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122 for (String s : names) {
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123 System.out.println(s);
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124 }
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125 } finally {
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126 da.done();
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127 }
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128 }
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129
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130 private static List<GroupElement> readGroup(DataAccess da) throws IOException {
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131 int len = da.readInt();
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132 LinkedList<GroupElement> rv = new LinkedList<HgBundle.GroupElement>();
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133 while (len > 4 && !da.isEmpty()) {
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134 byte[] nb = new byte[80];
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135 da.readBytes(nb, 0, 80);
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136 int dataLength = len-84;
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137 LinkedList<RevlogStream.PatchRecord> patches = new LinkedList<RevlogStream.PatchRecord>();
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138 while (dataLength > 0) {
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139 RevlogStream.PatchRecord pr = RevlogStream.PatchRecord.read(da);
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140 patches.add(pr);
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141 dataLength -= pr.len + 12;
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142 }
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143 rv.add(new GroupElement(nb, patches));
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144 len = da.isEmpty() ? 0 : da.readInt();
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145 }
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146 return rv;
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147 }
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148
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149 static class GroupElement {
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150 private byte[] header; // byte[80] takes 120 bytes, 4 Nodeids - 192
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151 private List<RevlogStream.PatchRecord> patches;
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152
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153 GroupElement(byte[] fourNodeids, List<RevlogStream.PatchRecord> patchList) {
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154 assert fourNodeids != null && fourNodeids.length == 80;
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155 // patchList.size() > 0
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156 header = fourNodeids;
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157 patches = patchList;
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158 }
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159 public Nodeid node() {
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160 return Nodeid.fromBinary(header, 0);
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161 }
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162 public Nodeid firstParent() {
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163 return Nodeid.fromBinary(header, 20);
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164 }
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165 public Nodeid secondParent() {
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166 return Nodeid.fromBinary(header, 40);
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167 }
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168 public Nodeid cset() { // cs seems to be changeset
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169 return Nodeid.fromBinary(header, 60);
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170 }
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171 }
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172 }