/// <summary>
/// </summary>
/// <param name="fileSource">defaults to an <see cref="FtpTzDbFileSource" /></param>
/// <param name="database">defaults to an <see cref="InMemoryExtractorDatabase" /></param>
/// <param name="parser">defaults to an <see cref="TzDbParser" /></param>
public TzDbExtractor(ITzDbFileSource fileSource = null, IExtractorDatabase database = null,
ITzDbParser parser = null)
{
_fileSource = fileSource ?? new FtpTzDbFileSource();
_extractorDatabase = database ?? new InMemoryExtractorDatabase();
_parser = parser ?? new TzDbParser();
}
/// <summary>
/// Parses the <paramref name="fileInfo" /> and adds parsed types to the
/// <paramref name="extractorDatabase" />
/// </summary>
/// <param name="fileInfo"></param>
/// <param name="extractorDatabase"></param>
public void Parse(IFileInfo fileInfo, IExtractorDatabase extractorDatabase)
{
Queue <Token> unProcessedTokens = _tokenizer.Tokenize(fileInfo);
Token beginFileToken = unProcessedTokens.Dequeue();
// guard first token received is start of file token
if (beginFileToken.TokenType != TokenType.BeginFile)
{
string msg = String.Format("received unexpected token type:{0} when token type should have been {1}",
beginFileToken.TokenType, TokenType.BeginFile);
throw new Exception(msg);
}
while (unProcessedTokens.Any())
{
Token firstToken = unProcessedTokens.Dequeue();
// handle end of file
if (firstToken.TokenType == TokenType.EndFile)
{
break;
}
// guard first token received is start of line token
if (firstToken.TokenType != TokenType.BeginLine)
{
string msg = String.Format(
"received unexpected token type:{0} when token type should have been {1}", firstToken.TokenType,
TokenType.BeginLine);
throw new Exception(msg);
}
TzDbLink?tzDbLink;
if (LinkExpression.TryParse(unProcessedTokens, out tzDbLink))
{
extractorDatabase.Links.Add(tzDbLink.Value);
continue;
}
TzDbZoneDescription tzDbZoneDescription;
if (ZoneDescriptionExpression.TryParse(unProcessedTokens, out tzDbZoneDescription))
{
extractorDatabase.ZoneDescriptions.Add(tzDbZoneDescription);
continue;
}
TzDbZoneDefinition tzDbZoneDefinition;
if (ZoneDefinitionExpression.TryParse(unProcessedTokens, out tzDbZoneDefinition))
{
extractorDatabase.ZoneDefinitions.Add(tzDbZoneDefinition);
continue;
}
TzDbRule?tzDbRule;
if (RuleExpression.TryParse(unProcessedTokens, out tzDbRule))
{
extractorDatabase.Rules.Add(tzDbRule.Value);
continue;
}
string unsupportedTokenMsg = String.Format("received unsupported tokens on line: {0} of file: {1}",
firstToken.Value, fileInfo.Name);
throw new Exception(unsupportedTokenMsg);
}
}
public ExtractorDatabaseReader(IExtractorDatabase extractorDatabase)
{
_extractorDatabase = extractorDatabase;
}
