Mercurial > hg4j

annotate src/com/tmate/hgkit/ll/HgBundle.java @ 36:205f9b59b400

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Strip parsing logic out from console frontend
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Thu, 13 Jan 2011 23:31:39 +0100
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children e45e75e22523
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36
205f9b59b400 Strip parsing logic out from console frontend
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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1 /*
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2 * Copyright (c) 2011 Artem Tikhomirov
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3 */
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4 package com.tmate.hgkit.ll;
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5
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6 import java.io.File;
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7 import java.io.IOException;
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8 import java.util.LinkedList;
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9 import java.util.List;
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10
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11 import com.tmate.hgkit.fs.DataAccess;
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12 import com.tmate.hgkit.fs.DataAccessProvider;
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13
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14 /**
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15 * @see http://mercurial.selenic.com/wiki/BundleFormat
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16 *
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17 * @author artem
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18 */
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19 public class HgBundle {
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20
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21 private final File bundleFile;
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22 private final DataAccessProvider accessProvider;
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23
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24 public HgBundle(DataAccessProvider dap, File bundle) {
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25 accessProvider = dap;
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26 bundleFile = bundle;
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27 }
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28
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29 public void read() throws IOException {
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30 DataAccess da = accessProvider.create(bundleFile);
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31 try {
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32 LinkedList<String> names = new LinkedList<String>();
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33 if (!da.isEmpty()) {
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34 System.out.println("Changelog group");
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35 List<GroupElement> changelogGroup = readGroup(da);
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36 for (GroupElement ge : changelogGroup) {
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37 System.out.printf(" %s %s %s %s; patches:%d\n", ge.node(), ge.firstParent(), ge.secondParent(), ge.cs(), ge.patches.size());
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38 }
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39 System.out.println("Manifest group");
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40 List<GroupElement> manifestGroup = readGroup(da);
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41 for (GroupElement ge : manifestGroup) {
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42 System.out.printf(" %s %s %s %s; patches:%d\n", ge.node(), ge.firstParent(), ge.secondParent(), ge.cs(), ge.patches.size());
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43 }
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44 while (!da.isEmpty()) {
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45 int fnameLen = da.readInt();
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46 if (fnameLen <= 4) {
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47 break; // null chunk, the last one.
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48 }
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49 byte[] fname = new byte[fnameLen - 4];
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50 da.readBytes(fname, 0, fname.length);
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51 names.add(new String(fname));
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52 List<GroupElement> fileGroup = readGroup(da);
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53 System.out.println(names.getLast());
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54 for (GroupElement ge : fileGroup) {
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55 System.out.printf(" %s %s %s %s; patches:%d\n", ge.node(), ge.firstParent(), ge.secondParent(), ge.cs(), ge.patches.size());
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56 }
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57 }
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58 }
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59 System.out.println(names.size());
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60 for (String s : names) {
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61 System.out.println(s);
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62 }
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63 } finally {
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64 da.done();
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65 }
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66 }
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67
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68 private static List<GroupElement> readGroup(DataAccess da) throws IOException {
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69 int len = da.readInt();
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70 LinkedList<GroupElement> rv = new LinkedList<HgBundle.GroupElement>();
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71 while (len > 4 && !da.isEmpty()) {
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72 byte[] nb = new byte[80];
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73 da.readBytes(nb, 0, 80);
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74 int dataLength = len-84;
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75 LinkedList<RevlogStream.PatchRecord> patches = new LinkedList<RevlogStream.PatchRecord>();
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76 while (dataLength > 0) {
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77 RevlogStream.PatchRecord pr = RevlogStream.PatchRecord.read(da);
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78 patches.add(pr);
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79 dataLength -= pr.len + 12;
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80 }
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81 rv.add(new GroupElement(nb, patches));
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82 len = da.isEmpty() ? 0 : da.readInt();
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83 }
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84 return rv;
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85 }
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86
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87 static class GroupElement {
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88 private byte[] header; // byte[80] takes 120 bytes, 4 Nodeids - 192
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89 private List<RevlogStream.PatchRecord> patches;
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90
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91 GroupElement(byte[] fourNodeids, List<RevlogStream.PatchRecord> patchList) {
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92 assert fourNodeids != null && fourNodeids.length == 80;
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93 // patchList.size() > 0
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94 header = fourNodeids;
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95 patches = patchList;
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96 }
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97 public Nodeid node() {
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98 return Nodeid.fromBinary(header, 0);
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99 }
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100 public Nodeid firstParent() {
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101 return Nodeid.fromBinary(header, 20);
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102 }
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103 public Nodeid secondParent() {
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104 return Nodeid.fromBinary(header, 40);
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105 }
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106 public Nodeid cs() {
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107 return Nodeid.fromBinary(header, 60);
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108 }
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109
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110 }
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111 }