annotate src/org/tmatesoft/hg/repo/HgManifest.java @ 369:091666b87f62

Issue 21: Recognize extensions with prefixed names
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Thu, 22 Dec 2011 01:46:40 +0300
parents 8107b95f4280
children 155c1893bda4
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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20
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21 import java.io.ByteArrayOutputStream;
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22 import java.io.IOException;
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23 import java.util.ArrayList;
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24 import java.util.Arrays;
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25 import java.util.HashMap;
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26 import java.util.Map;
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28 import org.tmatesoft.hg.core.HgException;
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29 import org.tmatesoft.hg.core.HgInvalidControlFileException;
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30 import org.tmatesoft.hg.core.Nodeid;
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31 import org.tmatesoft.hg.internal.DataAccess;
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32 import org.tmatesoft.hg.internal.DigestHelper;
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33 import org.tmatesoft.hg.internal.EncodingHelper;
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34 import org.tmatesoft.hg.internal.Experimental;
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35 import org.tmatesoft.hg.internal.IterateControlMediator;
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36 import org.tmatesoft.hg.internal.Lifecycle;
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37 import org.tmatesoft.hg.internal.Pool2;
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38 import org.tmatesoft.hg.internal.RevlogStream;
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39 import org.tmatesoft.hg.util.CancelSupport;
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40 import org.tmatesoft.hg.util.Path;
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41 import org.tmatesoft.hg.util.ProgressSupport;
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42
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43
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44 /**
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45 *
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46 * @author Artem Tikhomirov
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47 * @author TMate Software Ltd.
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48 */
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49 public class HgManifest extends Revlog {
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50 private RevisionMapper revisionMap;
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51
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52 public enum Flags {
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53 Exec, Link;
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54
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55 static Flags parse(String flags) {
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56 if ("x".equalsIgnoreCase(flags)) {
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57 return Exec;
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58 }
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59 if ("l".equalsIgnoreCase(flags)) {
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60 return Link;
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61 }
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62 if (flags == null) {
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63 return null;
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64 }
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65 throw new IllegalStateException(flags);
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66 }
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67
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68 static Flags parse(byte[] data, int start, int length) {
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69 if (length == 0) {
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70 return null;
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71 }
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72 if (length == 1) {
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73 if (data[start] == 'x') {
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74 return Exec;
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75 }
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76 if (data[start] == 'l') {
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77 return Link;
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78 }
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79 // FALL THROUGH
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80 }
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81 throw new IllegalStateException(new String(data, start, length));
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82 }
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83
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84 String nativeString() {
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85 if (this == Exec) {
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86 return "x";
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87 }
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88 if (this == Link) {
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89 return "l";
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90 }
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91 throw new IllegalStateException(toString());
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92 }
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93 }
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95 /*package-local*/ HgManifest(HgRepository hgRepo, RevlogStream content) {
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96 super(hgRepo, content);
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97 }
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98
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99 /**
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100 *
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101 * @param start changelog (not manifest!) revision to begin with
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102 * @param end changelog (not manifest!) revision to stop, inclusive.
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103 * @param inspector can't be <code>null</code>
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104 */
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105 public void walk(int start, int end, final Inspector inspector) throws /*FIXME HgInvalidRevisionException,*/ HgInvalidControlFileException {
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106 if (inspector == null) {
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107 throw new IllegalArgumentException();
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108 }
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109 int start0 = fromChangelog(start);
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110 int end0 = fromChangelog(end);
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111 if (end0 < start0) {
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112 // there are tool-constructed repositories that got order of changeset revisions completely different from that of manifest
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113 int x = end0;
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114 end0 = start0;
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115 start0 = x;
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116 }
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117 content.iterate(start0, end0, true, new ManifestParser(inspector));
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118 }
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119
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120 /**
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121 * "Sparse" iteration of the manifest
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122 *
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123 * @param inspector
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124 * @param revisionIndexes local indexes of changesets to visit
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125 */
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126 public void walk(final Inspector inspector, int... revisionIndexes) throws HgInvalidControlFileException{
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127 if (inspector == null || revisionIndexes == null) {
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128 throw new IllegalArgumentException();
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129 }
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130 int[] manifestRevs = toManifestRevisionIndexes(revisionIndexes);
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131 content.iterate(manifestRevs, true, new ManifestParser(inspector));
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132 }
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133
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134 // manifest revision number that corresponds to the given changeset
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135 /*package-local*/ int fromChangelog(int changesetRevisionIndex) throws HgInvalidControlFileException {
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136 if (HgInternals.wrongRevisionIndex(changesetRevisionIndex)) {
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137 throw new IllegalArgumentException(String.valueOf(changesetRevisionIndex));
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138 }
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139 if (changesetRevisionIndex == HgRepository.WORKING_COPY || changesetRevisionIndex == HgRepository.BAD_REVISION) {
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140 throw new IllegalArgumentException("Can't use constants like WORKING_COPY or BAD_REVISION");
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141 }
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142 // revisionNumber == TIP is processed by RevisionMapper
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143 if (revisionMap == null) {
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144 revisionMap = new RevisionMapper(getRepo());
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145 content.iterate(0, TIP, false, revisionMap);
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146 }
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147 return revisionMap.at(changesetRevisionIndex);
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148 }
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149
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150 /**
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151 * Extracts file revision as it was known at the time of given changeset.
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152 *
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153 * @param changelogRevisionIndex local changeset index
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154 * @param file path to file in question
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155 * @return file revision or <code>null</code> if manifest at specified revision doesn't list such file
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156 */
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157 @Experimental(reason="Perhaps, HgDataFile shall own this method, or get a delegate?")
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158 public Nodeid getFileRevision(int changelogRevisionIndex, final Path file) throws HgInvalidControlFileException{
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159 return getFileRevisions(file, changelogRevisionIndex).get(changelogRevisionIndex);
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160 }
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161
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162 // XXX package-local, IntMap, and HgDataFile getFileRevisionAt(int... localChangelogRevisions)
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163 @Experimental(reason="@see #getFileRevision")
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164 public Map<Integer, Nodeid> getFileRevisions(final Path file, int... changelogRevisionIndexes) throws HgInvalidControlFileException{
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165 // FIXME need tests
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166 int[] manifestRevisionIndexes = toManifestRevisionIndexes(changelogRevisionIndexes);
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167 final HashMap<Integer,Nodeid> rv = new HashMap<Integer, Nodeid>(changelogRevisionIndexes.length);
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168 content.iterate(manifestRevisionIndexes, true, new RevlogStream.Inspector() {
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169
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170 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess data) throws HgException {
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171 ByteArrayOutputStream bos = new ByteArrayOutputStream();
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172 try {
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173 byte b;
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174 while (!data.isEmpty() && (b = data.readByte()) != '\n') {
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175 if (b != 0) {
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176 bos.write(b);
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177 } else {
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178 String fname = new String(bos.toByteArray());
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179 bos.reset();
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180 if (file.toString().equals(fname)) {
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181 byte[] nid = new byte[40];
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182 data.readBytes(nid, 0, 40);
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183 rv.put(linkRevision, Nodeid.fromAscii(nid, 0, 40));
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184 break;
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185 } else {
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186 data.skip(40);
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187 }
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188 // else skip to the end of line
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189 while (!data.isEmpty() && (b = data.readByte()) != '\n')
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190 ;
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191 }
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192 }
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193 } catch (IOException ex) {
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194 throw new HgException(ex);
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195 }
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196 }
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197 });
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198 return rv;
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199 }
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200
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201
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202 private int[] toManifestRevisionIndexes(int[] changelogRevisionIndexes) throws HgInvalidControlFileException {
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203 int[] manifestRevs = new int[changelogRevisionIndexes.length];
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204 boolean needsSort = false;
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205 for (int i = 0; i < changelogRevisionIndexes.length; i++) {
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206 final int manifestRevisionIndex = fromChangelog(changelogRevisionIndexes[i]);
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207 manifestRevs[i] = manifestRevisionIndex;
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208 if (i > 0 && manifestRevs[i-1] > manifestRevisionIndex) {
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209 needsSort = true;
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210 }
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211 }
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212 if (needsSort) {
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213 Arrays.sort(manifestRevs);
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214 }
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215 return manifestRevs;
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216 }
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217
19
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218 public interface Inspector {
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219 boolean begin(int mainfestRevision, Nodeid nid, int changelogRevision);
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220 /**
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221 * @deprecated switch to {@link Inspector2#next(Nodeid, Path, Flags)}
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222 */
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223 @Deprecated
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224 boolean next(Nodeid nid, String fname, String flags);
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225 boolean end(int manifestRevision);
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226 }
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227
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228 @Experimental(reason="Explore Path alternative for filenames and enum for flags")
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229 public interface Inspector2 extends Inspector {
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230 boolean next(Nodeid nid, Path fname, Flags flags);
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231 }
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232
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233 /**
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234 * When Pool uses Strings directly,
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235 * ManifestParser creates new String instance with new char[] value, and does byte->char conversion.
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236 * For cpython repo, walk(0..10k), there are over 16 million filenames, of them only 3020 unique.
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237 * This means there are 15.9 million useless char[] instances and byte->char conversions
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238 *
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239 * When String (Path) is wrapped into {@link PathProxy}, there's extra overhead of byte[] representation
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240 * of the String, but these are only for unique Strings (Paths) (3020 in the example above). Besides, I save
268
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241 * useless char[] and byte->char conversions.
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242 */
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243 private static class PathProxy {
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244 private byte[] data;
268
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245 private int start;
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246 private final int hash, length;
285
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247 private Path result;
267
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248
285
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249 public PathProxy(byte[] data, int start, int length) {
267
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250 this.data = data;
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251 this.start = start;
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252 this.length = length;
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253
268
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254 // copy from String.hashCode(). In fact, not necessarily match result of String(data).hashCode
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255 // just need some nice algorithm here
267
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256 int h = 0;
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257 byte[] d = data;
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258 for (int i = 0, off = start, len = length; i < len; i++) {
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259 h = 31 * h + d[off++];
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260 }
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261 hash = h;
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262 }
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263
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264 @Override
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265 public boolean equals(Object obj) {
285
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266 if (false == obj instanceof PathProxy) {
267
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267 return false;
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268 }
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269 PathProxy o = (PathProxy) obj;
267
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270 if (o.result != null && result != null) {
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271 return result.equals(o.result);
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272 }
268
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273 if (o.length != length || o.hash != hash) {
267
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274 return false;
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275 }
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276 for (int i = 0, x = o.start, y = start; i < length; i++) {
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277 if (o.data[x++] != data[y++]) {
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278 return false;
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279 }
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280 }
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281 return true;
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282 }
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283 @Override
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284 public int hashCode() {
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285 return hash;
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286 }
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287
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288 public Path freeze() {
267
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289 if (result == null) {
320
678e326fd27c Issue 15: Exception accessing oddly named file from history
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290 result = Path.create(EncodingHelper.fromManifest(data, start, length));
268
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291 // release reference to bigger data array, make a copy of relevant part only
285
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292 // use original bytes, not those from String above to avoid cache misses due to different encodings
268
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293 byte[] d = new byte[length];
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294 System.arraycopy(data, start, d, 0, length);
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295 data = d;
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296 start = 0;
267
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297 }
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298 return result;
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299 }
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300 }
196
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301
312
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302 private static class ManifestParser implements RevlogStream.Inspector, Lifecycle {
196
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303 private final Inspector inspector;
285
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304 private final Inspector2 inspector2;
304
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305 private Pool2<Nodeid> nodeidPool, thisRevPool;
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306 private final Pool2<PathProxy> fnamePool;
266
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307 private byte[] nodeidLookupBuffer = new byte[20]; // get reassigned each time new Nodeid is added to pool
312
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308 private final ProgressSupport progressHelper;
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309 private IterateControlMediator iterateControl;
262
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310
196
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311 public ManifestParser(Inspector delegate) {
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312 assert delegate != null;
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313 inspector = delegate;
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314 inspector2 = delegate instanceof Inspector2 ? (Inspector2) delegate : null;
304
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315 nodeidPool = new Pool2<Nodeid>();
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316 fnamePool = new Pool2<PathProxy>();
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317 thisRevPool = new Pool2<Nodeid>();
312
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318 progressHelper = ProgressSupport.Factory.get(delegate);
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319 }
268
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320
366
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321 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess da) throws HgException {
196
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322 try {
312
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323 if (!inspector.begin(revisionNumber, new Nodeid(nodeid, true), linkRevision)) {
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324 iterateControl.stop();
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325 return;
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326 }
285
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327 Path fname = null;
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328 Flags flags = null;
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329 Nodeid nid = null;
267
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330 int i;
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331 byte[] data = da.byteArray();
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332 for (i = 0; i < actualLen; i++) {
267
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333 int x = i;
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334 for( ; data[i] != '\n' && i < actualLen; i++) {
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335 if (fname == null && data[i] == 0) {
285
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336 PathProxy px = fnamePool.unify(new PathProxy(data, x, i - x));
268
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337 // if (cached = fnamePool.unify(px))== px then cacheMiss, else cacheHit
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338 // cpython 0..10k: hits: 15 989 152, misses: 3020
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339 fname = px.freeze();
267
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340 x = i+1;
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341 }
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342 }
267
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343 if (i < actualLen) {
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344 assert data[i] == '\n';
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345 int nodeidLen = i - x < 40 ? i-x : 40; // if > 40, there are flags
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346 DigestHelper.ascii2bin(data, x, nodeidLen, nodeidLookupBuffer); // ignore return value as it's unlikely to have NULL in manifest
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347 nid = new Nodeid(nodeidLookupBuffer, false); // this Nodeid is for pool lookup only, mock object
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348 Nodeid cached = nodeidPool.unify(nid);
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349 if (cached == nid) {
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350 // buffer now belongs to the cached nodeid
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351 nodeidLookupBuffer = new byte[20];
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352 } else {
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353 nid = cached; // use existing version, discard the lookup object
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354 } // for cpython 0..10k, cache hits are 15 973 301, vs 18871 misses.
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355 thisRevPool.record(nid); // memorize revision for the next iteration.
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356 if (nodeidLen + x < i) {
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357 // 'x' and 'l' for executable bits and symlinks?
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358 // hg --debug manifest shows 644 for each regular file in my repo
285
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359 // for cpython 0..10k, there are 4361062 flag checks, and there's only 1 unique flag
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360 flags = Flags.parse(data, x + nodeidLen, i-x-nodeidLen);
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361 } else {
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362 flags = null;
267
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363 }
312
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364 boolean good2go;
285
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365 if (inspector2 == null) {
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366 String flagString = flags == null ? null : flags.nativeString();
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367 good2go = inspector.next(nid, fname.toString(), flagString);
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368 } else {
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369 good2go = inspector2.next(nid, fname, flags);
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370 }
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371 if (!good2go) {
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372 iterateControl.stop();
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373 return;
285
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374 }
267
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375 }
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376 nid = null;
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377 fname = null;
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378 flags = null;
196
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379 }
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380 if (!inspector.end(revisionNumber)) {
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381 iterateControl.stop();
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382 return;
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383 }
262
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384 //
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385 // keep only actual file revisions, found at this version
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386 // (next manifest is likely to refer to most of them, although in specific cases
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387 // like commit in another branch a lot may be useless)
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388 nodeidPool.clear();
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389 Pool2<Nodeid> t = nodeidPool;
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390 nodeidPool = thisRevPool;
264
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391 thisRevPool = t;
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392 iterateControl.checkCancelled();
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393 progressHelper.worked(1);
196
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394 } catch (IOException ex) {
366
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395 throw new HgException(ex);
196
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396 }
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397 }
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398
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399 public void start(int count, Callback callback, Object token) {
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400 CancelSupport cs = CancelSupport.Factory.get(inspector, null);
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401 iterateControl = new IterateControlMediator(cs, callback);
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402 progressHelper.start(count);
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403 }
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404
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405 public void finish(Object token) {
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406 progressHelper.done();
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407 }
196
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408 }
218
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409
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410 private static class RevisionMapper implements RevlogStream.Inspector, Lifecycle {
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411
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412 private final int changelogRevisions;
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413 private int[] changelog2manifest;
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414 private final HgRepository repo;
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415
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416 public RevisionMapper(HgRepository hgRepo) {
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417 repo = hgRepo;
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418 changelogRevisions = repo.getChangelog().getRevisionCount();
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419 }
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420
257
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421 // respects TIP
218
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422 public int at(int revisionNumber) {
257
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423 if (revisionNumber == TIP) {
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424 revisionNumber = changelogRevisions - 1;
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425 }
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426 if (changelog2manifest != null) {
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427 return changelog2manifest[revisionNumber];
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428 }
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429 return revisionNumber;
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430 }
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431
324
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432 // XXX likely can be replaced with Revlog.RevisionInspector
218
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433 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess data) {
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434 if (changelog2manifest != null) {
220
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435 // next assertion is not an error, rather assumption check, which is too development-related to be explicit exception -
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436 // I just wonder if there are manifests that have two entries pointing to single changeset. It seems unrealistic, though -
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437 // changeset records one and only one manifest nodeid
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438 assert changelog2manifest[linkRevision] == -1 : String.format("revision:%d, link:%d, already linked to revision:%d", revisionNumber, linkRevision, changelog2manifest[linkRevision]);
218
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439 changelog2manifest[linkRevision] = revisionNumber;
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440 } else {
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441 if (revisionNumber != linkRevision) {
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442 changelog2manifest = new int[changelogRevisions];
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443 Arrays.fill(changelog2manifest, -1);
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444 for (int i = 0; i < revisionNumber; changelog2manifest[i] = i, i++)
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445 ;
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446 changelog2manifest[linkRevision] = revisionNumber;
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447 }
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448 }
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449 }
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450
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451 public void start(int count, Callback callback, Object token) {
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452 if (count != changelogRevisions) {
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453 assert count < changelogRevisions; // no idea what to do if manifest has more revisions than changelog
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454 // the way how manifest may contain more revisions than changelog, as I can imagine, is a result of
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455 // some kind of an import tool (e.g. from SVN or CVS), that creates manifest and changelog independently.
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456 // Note, it's pure guess, I didn't see such repository yet (although the way manifest revisions
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457 // in cpython repo are numbered makes me think aforementioned way)
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458 changelog2manifest = new int[changelogRevisions];
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459 Arrays.fill(changelog2manifest, -1);
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460 }
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461 }
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462
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463 public void finish(Object token) {
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464 if (changelog2manifest == null) {
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465 return;
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466 }
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467 // I assume there'd be not too many revisions we don't know manifest of
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468 ArrayList<Integer> undefinedChangelogRevision = new ArrayList<Integer>();
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469 for (int i = 0; i < changelog2manifest.length; i++) {
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470 if (changelog2manifest[i] == -1) {
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471 undefinedChangelogRevision.add(i);
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472 }
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473 }
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474 for (int u : undefinedChangelogRevision) {
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475 try {
366
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476 Nodeid manifest = repo.getChangelog().range(u, u).get(0).manifest();
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477 // FIXME calculate those missing effectively (e.g. cache and sort nodeids to speed lookup
189dc6dc1c3e Use exceptions to expose errors reading mercurial data
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478 // right away in the #next (may refactor ParentWalker's sequential and sorted into dedicated helper and reuse here)
367
2fadf8695f8a Use 'revision index' instead of the vague 'local revision number' concept in the API
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 366
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479 changelog2manifest[u] = repo.getManifest().getRevisionIndex(manifest);
354
5f9073eabf06 Propagate errors with exceptions up to a end client
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 326
diff changeset
480 } catch (HgInvalidControlFileException ex) {
5f9073eabf06 Propagate errors with exceptions up to a end client
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 326
diff changeset
481 // FIXME need to propagate the error up to client
5f9073eabf06 Propagate errors with exceptions up to a end client
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 326
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482 repo.getContext().getLog().error(getClass(), ex, null);
5f9073eabf06 Propagate errors with exceptions up to a end client
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 326
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483 }
218
047b1dec7a04 Issue 7: Correctly handle manifest and changelog with different number of (or non-matching) revisions
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 196
diff changeset
484 }
047b1dec7a04 Issue 7: Correctly handle manifest and changelog with different number of (or non-matching) revisions
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 196
diff changeset
485 }
047b1dec7a04 Issue 7: Correctly handle manifest and changelog with different number of (or non-matching) revisions
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 196
diff changeset
486 }
2
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
487 }