public static bool TryParse(Queue <Token> unProcessedTokens, out TzDbZoneDescription zoneDescription)
{
// the value of the first token of every zone description entry is an iso 3166-2 character code
const String zoneDescriptionRegex = "^[A-Z]{2}$";
Token token = unProcessedTokens.Peek();
if (token.TokenType == TokenType.Stringliteral && Regex.IsMatch(token.Value, zoneDescriptionRegex))
{
string countryCode = unProcessedTokens.Dequeue().Value;
GeographyPoint coordinates = GeographyPointExpression.Parse(unProcessedTokens);
string tz = unProcessedTokens.Dequeue().Value;
String comments;
if (!TryParseComments(unProcessedTokens, out comments))
{
throw new Exception("Unable to parse zone description comments expression");
}
zoneDescription = new TzDbZoneDescription(countryCode, coordinates, tz, comments);
Token endLineToken = unProcessedTokens.Dequeue();
// guard end of line token was present
if (endLineToken.TokenType != TokenType.EndLine)
{
string msg = String.Format(
"received unexpected token type:{0} when token type should have been {1}",
endLineToken.TokenType, TokenType.EndLine);
throw new Exception(msg);
}
return(true);
}
zoneDescription = null;
return(false);
}
private TzDbZoneDescription FindTzDbZoneDescription(TzDbZoneDefinition tzDbZoneDefinition,
IEnumerable <TzDbZoneDescription> tzDbZoneDescriptions, IEnumerable <TimeZoneAlias> aliases)
{
TzDbZoneDescription description =
tzDbZoneDescriptions.SingleOrDefault(
tzDbZoneDescription => tzDbZoneDescription.Tz == tzDbZoneDefinition.Zone.Name);
if (null == description)
{
tzDbZoneDescriptions.SingleOrDefault(
tzDbZoneDescription => aliases.Any(alias => alias.Name == tzDbZoneDescription.Tz));
}
return(description);
}
public ITransformerDatabaseReader Transform()
{
IExtractorDatabaseReader extractorDatabaseReader = _tzDbExtractor.Extract();
// start with a clean slate (in case this is an update rather than an initial extraction)
_transformerDatabase.DropAndReCreate();
// group the rules by name
IEnumerable <IGrouping <string, TzDbRule> > tzDbRuleGroups =
extractorDatabaseReader.TzDbRules.GroupBy(tzDbRule => tzDbRule.Name);
foreach (TzDbZoneDefinition tzDbZoneDefinition in extractorDatabaseReader.TzDbZoneDefinitions)
{
Guid timeZoneId = Guid.NewGuid();
IEnumerable <TimeZoneImplementation> timeZoneImplementations = GetTimeZoneImplementations(timeZoneId,
tzDbZoneDefinition, tzDbRuleGroups);
IEnumerable <TimeZoneAlias> aliases = FindTimeZoneAliases(tzDbZoneDefinition,
extractorDatabaseReader.TzDbLinks);
TzDbZoneDescription description = FindTzDbZoneDescription(tzDbZoneDefinition,
extractorDatabaseReader.TzDbZoneDescriptions, aliases);
if (null != description)
{
// create a DbTimeZone from this ZoneDefinition
_transformerDatabase.TimeZones.Add(tzDbZoneDefinition.ToTimeZone(timeZoneId, description.Coordinates,
description.CountryCode, aliases, timeZoneImplementations));
continue;
}
// create a DbTimeZone from this ZoneDefinition
_transformerDatabase.TimeZones.Add(tzDbZoneDefinition.ToTimeZone(timeZoneId, null, null, aliases,
timeZoneImplementations));
}
return(new TransformerDatabaseReader(_transformerDatabase));
}
