public bool IsSentence(string sentence)
{
//Check if the sentence is null
if (String.IsNullOrWhiteSpace(sentence))
{
return(false);
}
//Check if the sentence contains comma seperated values
if (!sentence.Contains(","))
{
return(false);
}
string[] fields = sentence.Split(',');
//Check if the field length is valid for GPRMC
if (fields.Length != 12)
{
return(false);
}
//Check if the first field is a valid GPRMC sentence type
if (fields[0].ToUpper() != "$GPRMC")
{
return(false);
}
//Check if the second field is a valid time
if (!DateTimeUtil.IsTime(fields[1]))
{
return(false);
}
//Check if the fourth field is a valid latitude
if (!ParserUtil.IsLatitude(fields[3]))
{
return(false);
}
//Check if the fifth field is a valid latitude hemisphere
if (!ParserUtil.IsLatitudeHemisphere(fields[4]))
{
return(false);
}
//Check if the sixth field is a valid longtitude
if (!ParserUtil.IsLongtitude(fields[5]))
{
return(false);
}
//Check if the seventh field is a valid longtitude hemisphere
if (!ParserUtil.IsLongtitudeHemisphere(fields[6]))
{
return(false);
}
//Check if the eight field is a valid speed
if (!DoubleUtil.IsDouble(fields[7]))
{
return(false);
}
//Check if the ninth field is a valid bearing
if (!DoubleUtil.IsDouble(fields[8]))
{
return(false);
}
//Check if the tenth field is a valid date
if (!DateTimeUtil.IsShortDate(fields[9]))
{
return(false);
}
//Check if the eleventh field is a valid magnetic variation
//Optional field, therefore only validate if it is supplied
if (!String.IsNullOrWhiteSpace(fields[10]) && !DoubleUtil.IsDouble(fields[10]))
{
return(false);
}
//Check if the twelfth field is a valid checksum
string checksum = ParserUtil.GenerateChecksum(sentence);
if (fields[11].Substring(1) != checksum)
{
return(false);
}
return(true);
}
public BaseSentence ParseSentence(string sentence)
{
//Check if the sentence is null
if (String.IsNullOrWhiteSpace(sentence))
{
throw new ArgumentNullException("No sentence provided to parse");
}
//Check if the sentence contains comma seperated values
if (!sentence.Contains(","))
{
throw new ArgumentException("Sentence cannot be parsed");
}
string[] fields = sentence.Split(',');
//Check if the field length is valid for GPRMC
if (fields.Length != 12)
{
throw new ArgumentException("Invalid field length found in sentence");
}
//Check if the first field is a valid GPRMC sentence type
if (fields[0].ToUpper() != "$GPRMC")
{
throw new ArgumentException("Invalid sentence type provided in sentence");
}
//Check if the second field is a valid time
if (!DateTimeUtil.IsTime(fields[1]))
{
throw new ArgumentException("Invalid time provided in sentence");
}
//Check if the fourth field is a valid latitude
if (!ParserUtil.IsLatitude(fields[3]))
{
throw new ArgumentException("Invalid latitude provided in sentence");
}
//Check if the fifth field is a valid latitude hemisphere
if (!ParserUtil.IsLatitudeHemisphere(fields[4]))
{
throw new ArgumentException("Invalid latitude hemisphere provided in sentence");
}
//Check if the sixth field is a valid longtitude
if (!ParserUtil.IsLongtitude(fields[5]))
{
throw new ArgumentException("Invalid longtitude provided in sentence");
}
//Check if the seventh field is a valid longtitude hemisphere
if (!ParserUtil.IsLongtitudeHemisphere(fields[6]))
{
throw new ArgumentException("Invalid longtitude hemisphere provided in sentence");
}
//Check if the tenth field is a valid date
if (!DateTimeUtil.IsShortDate(fields[9]))
{
throw new ArgumentException("Invalid date provided in sentence");
}
//Check if the eleventh field is a valid magnetic variation
//Optional field, therefore only use it if it is supplied
if (!String.IsNullOrWhiteSpace(fields[10]) && !DoubleUtil.IsDouble(fields[10]))
{
throw new ArgumentException("Invalid magnetic variation provided in sentence");
}
//Check if the twelfth field is a valid checksum
string checksum = ParserUtil.GenerateChecksum(sentence);
if (fields[11].Substring(1) != checksum)
{
throw new ArgumentException("Invalid checksum provided for sentence");
}
DateTime timestamp = DateTimeUtil.GetDate(fields[9], fields[1]);
double latitude = ParserUtil.GetLatitude(fields[3], fields[4]);
double longtitude = ParserUtil.GetLongtitude(fields[5], fields[6]);
double speed = 0;
double bearing = 0;
double magVar = 0;
//Only convert the speed field if it's actually used
if (DoubleUtil.IsDouble(fields[7]))
{
speed = Double.Parse(fields[7]);
}
//Only convert the bearing field if it's actually used
if (DoubleUtil.IsDouble(fields[8]))
{
bearing = Double.Parse(fields[8]);
}
//Only convert the magnetic variation field if it's actually used
if (DoubleUtil.IsDouble(fields[10]))
{
magVar = Double.Parse(fields[10]);
}
return(new GPRMC(new LatLon(latitude, longtitude), bearing, speed, timestamp, magVar));
}
