Mercurial > hg4j

annotate src/org/tmatesoft/hg/repo/HgBundle.java @ 158:b413b16d10a5

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Integer offsets and file length explictly, rather than casts throughout code. Inflater may benefit from total length hint, but shall calculate it by its own if needed
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Wed, 09 Mar 2011 13:16:37 +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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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 }