public static string ConvertInput(string[] args, IConvertLengths converter)
{
const string correctFormat = "Please use format '<length> <unit> in <unit>'";
if (args==null || args.Length != 4) return correctFormat;
if (args[2] != "in") return "Incorrect command, expected 'in'. " + correctFormat;
double inputLength;
var inputLengthParsed = double.TryParse(args[0],out inputLength);
if (!inputLengthParsed) return string.Format("'{0}' is not a valid number. {1}", args[0], correctFormat);
var inputFormat = args[1];
var outputFormat = args[3];
double converted;
try
{
converted = converter.ConvertLength(inputFormat, outputFormat, inputLength);
}
catch (ArgumentOutOfRangeException e)
{
switch (e.ParamName)
{
case "inputFormat":
return IncorrectUnitMessage(inputFormat, converter);
case "outputFormat":
return IncorrectUnitMessage(outputFormat, converter);
default:
return correctFormat;
}
}
var output = string.Format("{0} {1} equals {2} {3}", inputLength, inputFormat, converted, outputFormat);
return output;
}
public ConverterController()
{
converter = new MEFConverter();
}
private static string IncorrectUnitMessage(string format, IConvertLengths converter)
{
string correctUnits = "Available units are " + String.Join(", ", converter.AvailableUnits.Select(p => "'" + p.ToString() + "'"));
return string.Format("'{0}' is not a valid unit. {1}", format, correctUnits);
}
public static string ConvertInput(string input, IConvertLengths converter)
{
return ConvertInput(input.Split(' '), converter);
}