Mercurial > jhg

annotate src/org/tmatesoft/hg/internal/Metadata.java @ 711:a62079bc422b

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Keyword filtering that doesn't depend on input buffer size and the way input lines got split between filter() calls. KewordFilter got state to keep processed suspicious ...$ lines
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Fri, 11 Oct 2013 21:35:41 +0200
parents 7efabe0cddcf
children
rev   line source
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1 /*
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2 * Copyright (c) 2013 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.internal;
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18
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19 import static org.tmatesoft.hg.repo.HgRepository.NO_REVISION;
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20 import static org.tmatesoft.hg.util.LogFacility.Severity.Error;
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21
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22 import java.io.ByteArrayOutputStream;
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23 import java.io.IOException;
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24 import java.util.ArrayList;
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25 import java.util.Collection;
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26
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27 import org.tmatesoft.hg.core.SessionContext;
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28 import org.tmatesoft.hg.repo.HgInvalidControlFileException;
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29 import org.tmatesoft.hg.repo.HgInvalidStateException;
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30 import org.tmatesoft.hg.util.LogFacility;
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31
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32 /**
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33 * Container for metadata recorded as part of file revisions
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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 final class Metadata {
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39 private static class Record {
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40 public final int offset;
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41 public final MetadataEntry[] entries;
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42
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43 public Record(int off, MetadataEntry[] entr) {
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44 offset = off;
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45 entries = entr;
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46 }
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47 }
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48 // XXX sparse array needed
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49 private final IntMap<Metadata.Record> entries = new IntMap<Metadata.Record>(5);
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50
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51 private final Metadata.Record NONE = new Record(-1, null); // don't want statics
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52
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53 private final LogFacility log;
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54
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55 private int lastRevRead = NO_REVISION;
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56
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57 public Metadata(SessionContext.Source sessionCtx) {
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58 log = sessionCtx.getSessionContext().getLog();
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59 }
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60
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61 /**
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62 * @return <code>true</code> when there's metadata for given revision
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63 */
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64 public boolean known(int revision) {
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65 Metadata.Record i = entries.get(revision);
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66 return i != null && NONE != i;
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67 }
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68
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69 /**
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70 * @return <code>true</code> when revision has been checked for metadata presence.
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71 */
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72 public boolean checked(int revision) {
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73 return entries.containsKey(revision);
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74 }
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75
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76 // true when revision has been checked and found not having any metadata
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77 public boolean none(int revision) {
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78 Metadata.Record i = entries.get(revision);
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79 return i == NONE;
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80 }
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81
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82 /**
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83 * Get the greatest revision index visited so far.
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84 * Note, doesn't imply all revisions up to this has been visited.
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85 */
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86 public int lastRevisionRead() {
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87 return lastRevRead;
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88 }
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89
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90 // mark revision as having no metadata.
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91 void recordNone(int revision) {
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92 Metadata.Record i = entries.get(revision);
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93 if (i == NONE) {
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94 return; // already there
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95 }
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96 if (i != null) {
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97 throw new HgInvalidStateException(String.format("Trying to override Metadata state for revision %d (known offset: %d)", revision, i));
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98 }
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99 entries.put(revision, NONE);
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100 }
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101
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102 // since this is internal class, callers are supposed to ensure arg correctness (i.e. ask known() before)
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103 public int dataOffset(int revision) {
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104 return entries.get(revision).offset;
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105 }
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106 void add(int revision, int dataOffset, Collection<MetadataEntry> e) {
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107 assert !entries.containsKey(revision);
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108 entries.put(revision, new Record(dataOffset, e.toArray(new MetadataEntry[e.size()])));
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109 }
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110
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111 /**
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112 * @return <code>true</code> if metadata has been found
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113 */
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114 public boolean tryRead(int revisionNumber, DataAccess data) throws IOException, HgInvalidControlFileException {
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115 final int daLength = data.length();
694
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116 if (lastRevRead == NO_REVISION || revisionNumber > lastRevRead) {
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117 lastRevRead = revisionNumber;
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118 }
602
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119 if (daLength < 4 || data.readByte() != 1 || data.readByte() != 10) {
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120 recordNone(revisionNumber);
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121 return false;
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122 } else {
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123 ArrayList<MetadataEntry> _metadata = new ArrayList<MetadataEntry>();
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124 int offset = parseMetadata(data, daLength, _metadata);
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125 add(revisionNumber, offset, _metadata);
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126 return true;
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127 }
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128 }
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129
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130 public String find(int revision, String key) {
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131 for (MetadataEntry me : entries.get(revision).entries) {
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132 if (me.matchKey(key)) {
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133 return me.value();
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134 }
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135 }
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136 return null;
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137 }
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138
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139 private int parseMetadata(DataAccess data, final int daLength, ArrayList<MetadataEntry> _metadata) throws IOException, HgInvalidControlFileException {
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140 int lastEntryStart = 2;
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141 int lastColon = -1;
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142 // XXX in fact, need smth like ByteArrayBuilder, similar to StringBuilder,
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143 // which can't be used here because we can't convert bytes to chars as we read them
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144 // (there might be multi-byte encoding), and we need to collect all bytes before converting to string
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145 ByteArrayOutputStream bos = new ByteArrayOutputStream();
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146 String key = null, value = null;
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147 boolean byteOne = false;
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148 boolean metadataIsComplete = false;
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149 for (int i = 2; i < daLength; i++) {
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150 byte b = data.readByte();
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151 if (b == '\n') {
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152 if (byteOne) { // i.e. \n follows 1
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153 lastEntryStart = i+1;
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154 metadataIsComplete = true;
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155 // XXX is it possible to have here incomplete key/value (i.e. if last pair didn't end with \n)
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156 // if yes, need to set metadataIsComplete to true in that case as well
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157 break;
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158 }
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159 if (key == null || lastColon == -1 || i <= lastColon) {
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160 log.dump(getClass(), Error, "Missing key in file revision metadata at index %d", i);
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161 }
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162 value = new String(bos.toByteArray()).trim();
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163 bos.reset();
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164 _metadata.add(new MetadataEntry(key, value));
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165 key = value = null;
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166 lastColon = -1;
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167 lastEntryStart = i+1;
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168 continue;
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169 }
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170 // byteOne has to be consumed up to this line, if not yet, consume it
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171 if (byteOne) {
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172 // insert 1 we've read on previous step into the byte builder
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173 bos.write(1);
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174 byteOne = false;
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175 // fall-through to consume current byte
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176 }
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177 if (b == (int) ':') {
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178 assert value == null;
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179 key = new String(bos.toByteArray());
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180 bos.reset();
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181 lastColon = i;
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182 } else if (b == 1) {
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183 byteOne = true;
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184 } else {
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185 bos.write(b);
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186 }
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187 }
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188 // data.isEmpty is not reliable, renamed files of size==0 keep only metadata
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189 if (!metadataIsComplete) {
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190 // XXX perhaps, worth a testcase (empty file, renamed, read or ask ifCopy
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191 throw new HgInvalidControlFileException("Metadata is not closed properly", null, null);
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192 }
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193 return lastEntryStart;
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194 }
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195
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196 /**
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197 * There may be several entries of metadata per single revision, this class captures single entry
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198 */
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199 private static class MetadataEntry {
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200 private final String entry;
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201 private final int valueStart;
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202
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203 // key may be null
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204 /* package-local */MetadataEntry(String key, String value) {
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205 if (key == null) {
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206 entry = value;
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207 valueStart = -1; // not 0 to tell between key == null and key == ""
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208 } else {
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209 entry = key + value;
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210 valueStart = key.length();
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211 }
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212 }
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213
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214 /* package-local */boolean matchKey(String key) {
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215 return key == null ? valueStart == -1 : key.length() == valueStart && entry.startsWith(key);
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216 }
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217
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218 // uncomment once/if needed
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219 // public String key() {
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220 // return entry.substring(0, valueStart);
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221 // }
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222
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223 public String value() {
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224 return valueStart == -1 ? entry : entry.substring(valueStart);
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225 }
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226 }
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227 }