Mercurial > hg4j

annotate src/org/tmatesoft/hg/internal/Metadata.java @ 695:053bb4397bf9

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Refactoring: nice Revlog.indexWalk() implementation
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Mon, 05 Aug 2013 18:45:16 +0200
parents 7efabe0cddcf
children
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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 }