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annotate src/org/tmatesoft/hg/repo/HgManifest.java @ 227:0fd10e5016dd

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IOException on empty repository with 40-byte dirstate
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Wed, 25 May 2011 13:13:36 +0200
parents 373e07cd3991
children b7347daa50e3
rev   line source
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1 /*
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2 * Copyright (c) 2010-2011 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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19 import static org.tmatesoft.hg.repo.HgRepository.TIP;
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21 import java.io.IOException;
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22 import java.util.ArrayList;
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23 import java.util.Arrays;
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25 import org.tmatesoft.hg.core.HgBadStateException;
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26 import org.tmatesoft.hg.core.Nodeid;
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27 import org.tmatesoft.hg.internal.DataAccess;
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28 import org.tmatesoft.hg.internal.Lifecycle;
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29 import org.tmatesoft.hg.internal.Pool;
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30 import org.tmatesoft.hg.internal.RevlogStream;
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33 /**
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34 *
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35 * @author Artem Tikhomirov
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36 * @author TMate Software Ltd.
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37 */
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38 public class HgManifest extends Revlog {
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39 private RevisionMapper revisionMap;
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41 /*package-local*/ HgManifest(HgRepository hgRepo, RevlogStream content) {
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42 super(hgRepo, content);
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43 }
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44
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45 /**
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46 *
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47 * @param start changelog (not manifest!) revision to begin with
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48 * @param end changelog (not manifest!) revision to stop, inclusive.
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49 * @param inspector can't be <code>null</code>
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50 */
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51 public void walk(int start, int end, final Inspector inspector) {
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52 if (inspector == null) {
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53 throw new IllegalArgumentException();
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54 }
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55 int start0 = fromChangelog(start);
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56 int end0 = fromChangelog(end);
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57 content.iterate(start0, end0, true, new ManifestParser(inspector));
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58 }
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60 /*package-local*/ int fromChangelog(int revisionNumber) {
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61 if (HgInternals.wrongLocalRevision(revisionNumber)) {
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62 throw new IllegalArgumentException(String.valueOf(revisionNumber));
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63 }
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64 if (revisionMap == null) {
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65 revisionMap = new RevisionMapper(getRepo());
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66 content.iterate(0, TIP, false, revisionMap);
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67 }
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68 return revisionMap.at(revisionNumber);
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69 }
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70
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71 public interface Inspector {
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72 boolean begin(int mainfestRevision, Nodeid nid, int changelogRevision);
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73 boolean next(Nodeid nid, String fname, String flags);
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74 boolean end(int manifestRevision);
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75 }
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77 private static class ManifestParser implements RevlogStream.Inspector {
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78 private boolean gtg = true; // good to go
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79 private final Inspector inspector;
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80 private final Pool<Nodeid> nodeidPool;
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81 private final Pool<String> fnamePool;
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82 private final Pool<String> flagsPool;
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83
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84 public ManifestParser(Inspector delegate) {
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85 assert delegate != null;
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86 inspector = delegate;
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87 nodeidPool = new Pool<Nodeid>();
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88 fnamePool = new Pool<String>();
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89 flagsPool = new Pool<String>();
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90 }
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91
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92 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess da) {
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93 if (!gtg) {
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94 return;
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95 }
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96 try {
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97 gtg = gtg && inspector.begin(revisionNumber, new Nodeid(nodeid, true), linkRevision);
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98 int i;
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99 String fname = null;
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100 String flags = null;
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101 Nodeid nid = null;
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102 byte[] data = da.byteArray();
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103 for (i = 0; gtg && i < actualLen; i++) {
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104 int x = i;
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105 for( ; data[i] != '\n' && i < actualLen; i++) {
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106 if (fname == null && data[i] == 0) {
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107 fname = fnamePool.unify(new String(data, x, i - x));
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108 x = i+1;
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109 }
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110 }
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111 if (i < actualLen) {
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112 assert data[i] == '\n';
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113 int nodeidLen = i - x < 40 ? i-x : 40;
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114 nid = nodeidPool.unify(Nodeid.fromAscii(data, x, nodeidLen));
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115 if (nodeidLen + x < i) {
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116 // 'x' and 'l' for executable bits and symlinks?
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117 // hg --debug manifest shows 644 for each regular file in my repo
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118 flags = flagsPool.unify(new String(data, x + nodeidLen, i-x-nodeidLen));
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119 }
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120 gtg = gtg && inspector.next(nid, fname, flags);
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121 }
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122 nid = null;
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123 fname = flags = null;
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124 }
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125 gtg = gtg && inspector.end(revisionNumber);
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126 } catch (IOException ex) {
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127 throw new HgBadStateException(ex);
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128 }
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129 }
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130 }
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131
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132 private static class RevisionMapper implements RevlogStream.Inspector, Lifecycle {
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133
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134 private final int changelogRevisions;
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135 private int[] changelog2manifest;
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136 private final HgRepository repo;
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137
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138 public RevisionMapper(HgRepository hgRepo) {
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139 repo = hgRepo;
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140 changelogRevisions = repo.getChangelog().getRevisionCount();
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141 }
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142
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143 public int at(int revisionNumber) {
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144 if (changelog2manifest != null) {
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145 return changelog2manifest[revisionNumber];
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146 }
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147 return revisionNumber;
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148 }
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149
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150 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess data) {
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151 if (changelog2manifest != null) {
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152 // next assertion is not an error, rather assumption check, which is too development-related to be explicit exception -
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153 // I just wonder if there are manifests that have two entries pointing to single changeset. It seems unrealistic, though -
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154 // changeset records one and only one manifest nodeid
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155 assert changelog2manifest[linkRevision] == -1 : String.format("revision:%d, link:%d, already linked to revision:%d", revisionNumber, linkRevision, changelog2manifest[linkRevision]);
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156 changelog2manifest[linkRevision] = revisionNumber;
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157 } else {
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158 if (revisionNumber != linkRevision) {
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159 changelog2manifest = new int[changelogRevisions];
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160 Arrays.fill(changelog2manifest, -1);
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161 for (int i = 0; i < revisionNumber; changelog2manifest[i] = i, i++)
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162 ;
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163 changelog2manifest[linkRevision] = revisionNumber;
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164 }
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165 }
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166 }
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167
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168 public void start(int count, Callback callback, Object token) {
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169 if (count != changelogRevisions) {
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170 assert count < changelogRevisions; // no idea what to do if manifest has more revisions than changelog
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171 // the way how manifest may contain more revisions than changelog, as I can imagine, is a result of
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172 // some kind of an import tool (e.g. from SVN or CVS), that creates manifest and changelog independently.
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173 // Note, it's pure guess, I didn't see such repository yet (although the way manifest revisions
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174 // in cpython repo are numbered makes me think aforementioned way)
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175 changelog2manifest = new int[changelogRevisions];
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176 Arrays.fill(changelog2manifest, -1);
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177 }
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178 }
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179
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180 public void finish(Object token) {
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181 if (changelog2manifest == null) {
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182 return;
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183 }
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184 // I assume there'd be not too many revisions we don't know manifest of
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185 ArrayList<Integer> undefinedChangelogRevision = new ArrayList<Integer>();
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186 for (int i = 0; i < changelog2manifest.length; i++) {
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187 if (changelog2manifest[i] == -1) {
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188 undefinedChangelogRevision.add(i);
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189 }
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190 }
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191 for (int u : undefinedChangelogRevision) {
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192 Nodeid manifest = repo.getChangelog().range(u, u).get(0).manifest();
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193 // FIXME calculate those missing effectively (e.g. cache and sort nodeids to speed lookup
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194 // right away in the #next (may refactor ParentWalker's sequential and sorted into dedicated helper and reuse here)
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195 changelog2manifest[u] = repo.getManifest().getLocalRevision(manifest);
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196 }
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197 }
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198 }
2
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199 }