Mercurial > jhg

annotate src/com/tmate/hgkit/ll/HgBundle.java @ 37:e45e75e22523

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Parse changesets from bundle's changelog group. Refactor Revlog to provide access to revision's raw content
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Fri, 14 Jan 2011 00:49:58 +0100
parents 205f9b59b400
children 4e9b66b07a28
rev   line source
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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 changes(HgRepository hgRepo) throws IOException {
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30 DataAccess da = accessProvider.create(bundleFile);
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31 try {
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32 List<GroupElement> changelogGroup = readGroup(da);
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33 byte[] baseRevContent = null;
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34 for (GroupElement ge : changelogGroup) {
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35 if (baseRevContent == null) {
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36 // first parent is base revision, see bundlerepo.py
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37 // if not prev: prev = p1 in bundlerevlog cons
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38 baseRevContent = hgRepo.getChangelog().content(ge.firstParent());
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39 }
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40 int resultLen = 10000; // XXX calculate based on baseRevContent.length and ge.patches
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41 byte[] csetContent = RevlogStream.apply(baseRevContent, resultLen, ge.patches);
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42 Changeset cs = Changeset.parse(csetContent, 0, csetContent.length);
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43 cs.dump();
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44 baseRevContent = csetContent;
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45 }
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46 } finally {
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47 da.done();
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48 }
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49 }
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50
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51 public void dump() throws IOException {
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52 DataAccess da = accessProvider.create(bundleFile);
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53 try {
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54 LinkedList<String> names = new LinkedList<String>();
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55 if (!da.isEmpty()) {
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56 System.out.println("Changelog group");
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57 List<GroupElement> changelogGroup = readGroup(da);
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58 for (GroupElement ge : changelogGroup) {
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59 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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60 }
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61 System.out.println("Manifest group");
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62 List<GroupElement> manifestGroup = readGroup(da);
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63 for (GroupElement ge : manifestGroup) {
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64 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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65 }
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66 while (!da.isEmpty()) {
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67 int fnameLen = da.readInt();
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68 if (fnameLen <= 4) {
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69 break; // null chunk, the last one.
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70 }
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71 byte[] fname = new byte[fnameLen - 4];
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72 da.readBytes(fname, 0, fname.length);
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73 names.add(new String(fname));
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74 List<GroupElement> fileGroup = readGroup(da);
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75 System.out.println(names.getLast());
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76 for (GroupElement ge : fileGroup) {
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77 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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78 }
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79 }
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80 }
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81 System.out.println(names.size());
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82 for (String s : names) {
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83 System.out.println(s);
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84 }
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85 } finally {
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86 da.done();
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87 }
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88 }
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89
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90 private static List<GroupElement> readGroup(DataAccess da) throws IOException {
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91 int len = da.readInt();
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92 LinkedList<GroupElement> rv = new LinkedList<HgBundle.GroupElement>();
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93 while (len > 4 && !da.isEmpty()) {
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94 byte[] nb = new byte[80];
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95 da.readBytes(nb, 0, 80);
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96 int dataLength = len-84;
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97 LinkedList<RevlogStream.PatchRecord> patches = new LinkedList<RevlogStream.PatchRecord>();
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98 while (dataLength > 0) {
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99 RevlogStream.PatchRecord pr = RevlogStream.PatchRecord.read(da);
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100 patches.add(pr);
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101 dataLength -= pr.len + 12;
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102 }
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103 rv.add(new GroupElement(nb, patches));
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104 len = da.isEmpty() ? 0 : da.readInt();
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105 }
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106 return rv;
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107 }
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108
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109 static class GroupElement {
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110 private byte[] header; // byte[80] takes 120 bytes, 4 Nodeids - 192
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111 private List<RevlogStream.PatchRecord> patches;
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112
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113 GroupElement(byte[] fourNodeids, List<RevlogStream.PatchRecord> patchList) {
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114 assert fourNodeids != null && fourNodeids.length == 80;
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115 // patchList.size() > 0
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116 header = fourNodeids;
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117 patches = patchList;
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118 }
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119 public Nodeid node() {
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120 return Nodeid.fromBinary(header, 0);
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121 }
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122 public Nodeid firstParent() {
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123 return Nodeid.fromBinary(header, 20);
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124 }
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125 public Nodeid secondParent() {
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126 return Nodeid.fromBinary(header, 40);
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127 }
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e45e75e22523 Parse changesets from bundle's changelog group. Refactor Revlog to provide access to revision's raw content
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 36
diff changeset
128 public Nodeid cset() { // cs seems to be changeset
36
205f9b59b400 Strip parsing logic out from console frontend
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
129 return Nodeid.fromBinary(header, 60);
205f9b59b400 Strip parsing logic out from console frontend
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
130 }
205f9b59b400 Strip parsing logic out from console frontend
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
131 }
205f9b59b400 Strip parsing logic out from console frontend
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
132 }