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annotate src/org/tmatesoft/hg/internal/Metadata.java @ 602:e3717fc7d26f

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Refactor metadata parsing in HgDataFile, moved to standalone class
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Mon, 06 May 2013 17:11:29 +0200
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children 7efabe0cddcf
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e3717fc7d26f Refactor metadata parsing in HgDataFile, moved to standalone class
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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.util.LogFacility.Severity.Error;
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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.Collection;
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25
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26 import org.tmatesoft.hg.core.SessionContext;
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27 import org.tmatesoft.hg.repo.HgInvalidControlFileException;
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28 import org.tmatesoft.hg.repo.HgInvalidStateException;
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29 import org.tmatesoft.hg.util.LogFacility;
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30
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31 /**
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32 * Container for metadata recorded as part of file revisions
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33 *
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34 * @author Artem Tikhomirov
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35 * @author TMate Software Ltd.
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36 */
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37 public final class Metadata {
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38 private static class Record {
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39 public final int offset;
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40 public final MetadataEntry[] entries;
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41
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42 public Record(int off, MetadataEntry[] entr) {
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43 offset = off;
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44 entries = entr;
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45 }
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46 }
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47 // XXX sparse array needed
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48 private final IntMap<Metadata.Record> entries = new IntMap<Metadata.Record>(5);
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49
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50 private final Metadata.Record NONE = new Record(-1, null); // don't want statics
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51
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52 private final LogFacility log;
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53
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54 public Metadata(SessionContext.Source sessionCtx) {
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55 log = sessionCtx.getSessionContext().getLog();
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56 }
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57
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58 // true when there's metadata for given revision
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59 public boolean known(int revision) {
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60 Metadata.Record i = entries.get(revision);
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61 return i != null && NONE != i;
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62 }
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63
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64 // true when revision has been checked for metadata presence.
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65 public boolean checked(int revision) {
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66 return entries.containsKey(revision);
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67 }
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68
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69 // true when revision has been checked and found not having any metadata
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70 public boolean none(int revision) {
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71 Metadata.Record i = entries.get(revision);
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72 return i == NONE;
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73 }
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74
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75 // mark revision as having no metadata.
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76 void recordNone(int revision) {
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77 Metadata.Record i = entries.get(revision);
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78 if (i == NONE) {
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79 return; // already there
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80 }
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81 if (i != null) {
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82 throw new HgInvalidStateException(String.format("Trying to override Metadata state for revision %d (known offset: %d)", revision, i));
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83 }
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84 entries.put(revision, NONE);
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85 }
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86
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87 // since this is internal class, callers are supposed to ensure arg correctness (i.e. ask known() before)
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88 public int dataOffset(int revision) {
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89 return entries.get(revision).offset;
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90 }
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91 void add(int revision, int dataOffset, Collection<MetadataEntry> e) {
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92 assert !entries.containsKey(revision);
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93 entries.put(revision, new Record(dataOffset, e.toArray(new MetadataEntry[e.size()])));
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94 }
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95
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96 /**
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97 * @return <code>true</code> if metadata has been found
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98 */
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99 public boolean tryRead(int revisionNumber, DataAccess data) throws IOException, HgInvalidControlFileException {
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100 final int daLength = data.length();
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101 if (daLength < 4 || data.readByte() != 1 || data.readByte() != 10) {
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102 recordNone(revisionNumber);
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103 return false;
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104 } else {
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105 ArrayList<MetadataEntry> _metadata = new ArrayList<MetadataEntry>();
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106 int offset = parseMetadata(data, daLength, _metadata);
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107 add(revisionNumber, offset, _metadata);
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108 return true;
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109 }
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110 }
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111
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112 public String find(int revision, String key) {
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113 for (MetadataEntry me : entries.get(revision).entries) {
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114 if (me.matchKey(key)) {
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115 return me.value();
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116 }
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117 }
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118 return null;
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119 }
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120
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121 private int parseMetadata(DataAccess data, final int daLength, ArrayList<MetadataEntry> _metadata) throws IOException, HgInvalidControlFileException {
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122 int lastEntryStart = 2;
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123 int lastColon = -1;
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124 // XXX in fact, need smth like ByteArrayBuilder, similar to StringBuilder,
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125 // which can't be used here because we can't convert bytes to chars as we read them
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126 // (there might be multi-byte encoding), and we need to collect all bytes before converting to string
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127 ByteArrayOutputStream bos = new ByteArrayOutputStream();
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128 String key = null, value = null;
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129 boolean byteOne = false;
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130 boolean metadataIsComplete = false;
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131 for (int i = 2; i < daLength; i++) {
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132 byte b = data.readByte();
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133 if (b == '\n') {
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134 if (byteOne) { // i.e. \n follows 1
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135 lastEntryStart = i+1;
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136 metadataIsComplete = true;
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137 // XXX is it possible to have here incomplete key/value (i.e. if last pair didn't end with \n)
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138 // if yes, need to set metadataIsComplete to true in that case as well
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139 break;
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140 }
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141 if (key == null || lastColon == -1 || i <= lastColon) {
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142 log.dump(getClass(), Error, "Missing key in file revision metadata at index %d", i);
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143 }
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144 value = new String(bos.toByteArray()).trim();
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145 bos.reset();
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146 _metadata.add(new MetadataEntry(key, value));
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147 key = value = null;
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148 lastColon = -1;
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149 lastEntryStart = i+1;
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150 continue;
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151 }
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152 // byteOne has to be consumed up to this line, if not yet, consume it
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153 if (byteOne) {
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154 // insert 1 we've read on previous step into the byte builder
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155 bos.write(1);
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156 byteOne = false;
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157 // fall-through to consume current byte
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158 }
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159 if (b == (int) ':') {
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160 assert value == null;
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161 key = new String(bos.toByteArray());
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162 bos.reset();
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163 lastColon = i;
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164 } else if (b == 1) {
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165 byteOne = true;
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166 } else {
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167 bos.write(b);
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168 }
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169 }
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170 // data.isEmpty is not reliable, renamed files of size==0 keep only metadata
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171 if (!metadataIsComplete) {
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172 // XXX perhaps, worth a testcase (empty file, renamed, read or ask ifCopy
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173 throw new HgInvalidControlFileException("Metadata is not closed properly", null, null);
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174 }
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175 return lastEntryStart;
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176 }
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177
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178 /**
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179 * There may be several entries of metadata per single revision, this class captures single entry
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180 */
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181 private static class MetadataEntry {
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182 private final String entry;
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183 private final int valueStart;
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184
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185 // key may be null
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186 /* package-local */MetadataEntry(String key, String value) {
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187 if (key == null) {
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188 entry = value;
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189 valueStart = -1; // not 0 to tell between key == null and key == ""
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190 } else {
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191 entry = key + value;
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192 valueStart = key.length();
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193 }
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194 }
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195
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196 /* package-local */boolean matchKey(String key) {
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197 return key == null ? valueStart == -1 : key.length() == valueStart && entry.startsWith(key);
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198 }
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199
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200 // uncomment once/if needed
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201 // public String key() {
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202 // return entry.substring(0, valueStart);
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203 // }
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204
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205 public String value() {
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206 return valueStart == -1 ? entry : entry.substring(valueStart);
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207 }
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208 }
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209 }