/// <summary>
/// Convert from one Measurement to another. This takes care of finding
/// a ConvertProc out of the converters dictionary and applies it; throws
/// an Exception if the (incoming.BaseUnit -> outgoingUnits) converter
/// function cannot be found.
/// </summary>
/// <param name="from">The Measurement to convert</param>
/// <param name="to">The units of measure to convert to</param>
/// <returns>Converted Measurement</returns>
public static IMeasurement Convert(IMeasurement from, string to)
{
// Identity transformation always works. We do handle
// differences in exponent
if (_SIUnits.BaseUnit(to) == from.BaseUnit)
{
if (_SIUnits.Exponent(to) == from.Exponent)
{
return(from);
}
var toExp = _SIUnits.Exponent(to);
var expDiff = from.Exponent - toExp;
return(new Measurement(from.Quantity * (decimal)Math.Pow(10, expDiff), toExp, _SIUnits.BaseUnit(to)));
}
// Can we find a converter for these two units? Use TryGetValue()
// to avoid the KeyNotFoundException that gets thrown using the
// traditional [] lookup--we want to throw our own exception.
//
ConvertProc converter = null;
if (converters.TryGetValue(new Tuple <string, string>(from.BaseUnit, to), out converter))
{
return(converter(from));
}
// I dunno what the hell you're trying to convert
//
throw new Exception(
String.Format(
"Unrecognized Measurement conversion: {0} to {1}",
from.BaseUnit, to));
}
