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annotate src/org/tmatesoft/hg/repo/HgManifest.java @ 375:729ba8f7d14e

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Issue 22: UnsupportedOperationException when all files are deleted in a branch
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Mon, 23 Jan 2012 16:51:34 +0100
parents 155c1893bda4
children 6150555eb41d
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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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
268
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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
285
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288 public Path freeze() {
267
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289 if (result == null) {
320
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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 }
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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;
285
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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 }
372
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327 if (!da.isEmpty()) {
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328 // although unlikely, manifest entry may be empty, when all files have been deleted from the repository
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329 Path fname = null;
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330 Flags flags = null;
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331 Nodeid nid = null;
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332 int i;
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333 byte[] data = da.byteArray();
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334 for (i = 0; i < actualLen; i++) {
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335 int x = i;
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336 for( ; data[i] != '\n' && i < actualLen; i++) {
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337 if (fname == null && data[i] == 0) {
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338 PathProxy px = fnamePool.unify(new PathProxy(data, x, i - x));
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339 // if (cached = fnamePool.unify(px))== px then cacheMiss, else cacheHit
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340 // cpython 0..10k: hits: 15 989 152, misses: 3020
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341 fname = px.freeze();
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342 x = i+1;
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343 }
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344 }
372
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345 if (i < actualLen) {
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346 assert data[i] == '\n';
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347 int nodeidLen = i - x < 40 ? i-x : 40; // if > 40, there are flags
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348 DigestHelper.ascii2bin(data, x, nodeidLen, nodeidLookupBuffer); // ignore return value as it's unlikely to have NULL in manifest
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349 nid = new Nodeid(nodeidLookupBuffer, false); // this Nodeid is for pool lookup only, mock object
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diff changeset
350 Nodeid cached = nodeidPool.unify(nid);
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351 if (cached == nid) {
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352 // buffer now belongs to the cached nodeid
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353 nodeidLookupBuffer = new byte[20];
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354 } else {
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355 nid = cached; // use existing version, discard the lookup object
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356 } // for cpython 0..10k, cache hits are 15 973 301, vs 18871 misses.
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357 thisRevPool.record(nid); // memorize revision for the next iteration.
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358 if (nodeidLen + x < i) {
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359 // 'x' and 'l' for executable bits and symlinks?
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360 // hg --debug manifest shows 644 for each regular file in my repo
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361 // for cpython 0..10k, there are 4361062 flag checks, and there's only 1 unique flag
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362 flags = Flags.parse(data, x + nodeidLen, i-x-nodeidLen);
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363 } else {
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364 flags = null;
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365 }
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366 boolean good2go;
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367 if (inspector2 == null) {
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368 String flagString = flags == null ? null : flags.nativeString();
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369 good2go = inspector.next(nid, fname.toString(), flagString);
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370 } else {
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371 good2go = inspector2.next(nid, fname, flags);
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372 }
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373 if (!good2go) {
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374 iterateControl.stop();
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375 return;
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376 }
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377 }
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378 nid = null;
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379 fname = null;
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380 flags = null;
196
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381 }
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382 }
312
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383 if (!inspector.end(revisionNumber)) {
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384 iterateControl.stop();
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385 return;
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386 }
262
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387 //
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388 // keep only actual file revisions, found at this version
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389 // (next manifest is likely to refer to most of them, although in specific cases
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390 // like commit in another branch a lot may be useless)
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391 nodeidPool.clear();
304
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392 Pool2<Nodeid> t = nodeidPool;
262
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393 nodeidPool = thisRevPool;
264
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394 thisRevPool = t;
313
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395 iterateControl.checkCancelled();
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396 progressHelper.worked(1);
196
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397 } catch (IOException ex) {
366
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398 throw new HgException(ex);
196
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399 }
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400 }
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401
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402 public void start(int count, Callback callback, Object token) {
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403 CancelSupport cs = CancelSupport.Factory.get(inspector, null);
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404 iterateControl = new IterateControlMediator(cs, callback);
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405 progressHelper.start(count);
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406 }
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407
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408 public void finish(Object token) {
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409 progressHelper.done();
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410 }
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411 }
218
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412
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413 private static class RevisionMapper implements RevlogStream.Inspector, Lifecycle {
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414
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415 private final int changelogRevisions;
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416 private int[] changelog2manifest;
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417 private final HgRepository repo;
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418
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419 public RevisionMapper(HgRepository hgRepo) {
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420 repo = hgRepo;
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421 changelogRevisions = repo.getChangelog().getRevisionCount();
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422 }
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423
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424 // respects TIP
218
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425 public int at(int revisionNumber) {
257
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426 if (revisionNumber == TIP) {
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427 revisionNumber = changelogRevisions - 1;
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428 }
218
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429 if (changelog2manifest != null) {
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430 return changelog2manifest[revisionNumber];
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431 }
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432 return revisionNumber;
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433 }
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434
324
283b294d1079 Explore alternatives to access file-changelog combined history
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diff changeset
435 // XXX likely can be replaced with Revlog.RevisionInspector
218
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436 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess data) {
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437 if (changelog2manifest != null) {
220
8de327242aa0 Basic information about branches
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438 // next assertion is not an error, rather assumption check, which is too development-related to be explicit exception -
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439 // I just wonder if there are manifests that have two entries pointing to single changeset. It seems unrealistic, though -
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440 // changeset records one and only one manifest nodeid
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441 assert changelog2manifest[linkRevision] == -1 : String.format("revision:%d, link:%d, already linked to revision:%d", revisionNumber, linkRevision, changelog2manifest[linkRevision]);
218
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442 changelog2manifest[linkRevision] = revisionNumber;
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443 } else {
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444 if (revisionNumber != linkRevision) {
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445 changelog2manifest = new int[changelogRevisions];
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446 Arrays.fill(changelog2manifest, -1);
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447 for (int i = 0; i < revisionNumber; changelog2manifest[i] = i, i++)
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448 ;
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449 changelog2manifest[linkRevision] = revisionNumber;
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450 }
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diff changeset
451 }
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diff changeset
452 }
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diff changeset
453
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diff changeset
454 public void start(int count, Callback callback, Object token) {
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455 if (count != changelogRevisions) {
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456 assert count < changelogRevisions; // no idea what to do if manifest has more revisions than changelog
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457 // the way how manifest may contain more revisions than changelog, as I can imagine, is a result of
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458 // some kind of an import tool (e.g. from SVN or CVS), that creates manifest and changelog independently.
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459 // Note, it's pure guess, I didn't see such repository yet (although the way manifest revisions
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diff changeset
460 // in cpython repo are numbered makes me think aforementioned way)
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diff changeset
461 changelog2manifest = new int[changelogRevisions];
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462 Arrays.fill(changelog2manifest, -1);
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diff changeset
463 }
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diff changeset
464 }
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diff changeset
465
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diff changeset
466 public void finish(Object token) {
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diff changeset
467 if (changelog2manifest == null) {
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diff changeset
468 return;
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diff changeset
469 }
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diff changeset
470 // I assume there'd be not too many revisions we don't know manifest of
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diff changeset
471 ArrayList<Integer> undefinedChangelogRevision = new ArrayList<Integer>();
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472 for (int i = 0; i < changelog2manifest.length; i++) {
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473 if (changelog2manifest[i] == -1) {
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474 undefinedChangelogRevision.add(i);
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475 }
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diff changeset
476 }
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477 for (int u : undefinedChangelogRevision) {
354
5f9073eabf06 Propagate errors with exceptions up to a end client
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478 try {
366
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diff changeset
479 Nodeid manifest = repo.getChangelog().range(u, u).get(0).manifest();
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diff changeset
480 // FIXME calculate those missing effectively (e.g. cache and sort nodeids to speed lookup
189dc6dc1c3e Use exceptions to expose errors reading mercurial data
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 354
diff changeset
481 // 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
diff changeset
482 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
483 } catch (HgInvalidControlFileException ex) {
5f9073eabf06 Propagate errors with exceptions up to a end client
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 326
diff changeset
484 // 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
diff changeset
485 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
diff changeset
486 }
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
487 }
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
488 }
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
489 }
2
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
490 }