private static void HandleOutput(CliOptions options, FibonacciResultSet resultSet)
{
IFibonacciOutput outputMethod;
if (options.OutputFile == null)
{
outputMethod = new DirectFibonacciOutput();
}
else if (Path.GetExtension(options.OutputFile) == ".xml")
{
outputMethod = new XMLFibonacciOutput(options.OutputFile);
}
else
{
outputMethod = new PlainTextFibonacciOutput(options.OutputFile);
}
outputMethod.WriteResult(resultSet);
}
private static void Main(string[] args)
{
var options = new CliOptions();
// parser fail case
if (!Parser.Default.ParseArguments(args, options))
{
Console.Write(options.GetUsage());
Environment.Exit(1);
}
// no input case
if (args.Length == 0 || (options.InputFile == null && options.InputNumber == null && options.InteractiveMode == false))
{
Console.Write(options.GetUsage());
Environment.Exit(1);
}
int numVal = 0;
try
{
numVal = GetInputValue(options);
}
catch (InvalidFibonacciInputException e)
{
Console.WriteLine(e.Message);
Environment.Exit(1);
}
// negative number case
if (numVal < 0)
{
Console.WriteLine("Number must be positive.");
Environment.Exit(1);
}
FibonacciCalculator.Calculator calc = new FibonacciCalculator.Calculator();
FibonacciResultSet results = calc.Compute(numVal);
HandleOutput(options, results);
}
private static int GetInputValue(CliOptions options)
{
IFibonacciInput inputMethod;
if (options.InteractiveMode)
{
inputMethod = new InteractiveFibonacciInput();
}
else if (options.InputFile == null)
{
// attempt to parse InputNumber
return BaseFibonacciInput.ParseStringArgument(options.InputNumber);
}
else if (Path.GetExtension(options.InputFile) == ".xml")
{
inputMethod = new XMLFibonacciInput(options.InputFile);
}
else
{
inputMethod = new PlainTextFibonacciInput(options.InputFile);
}
return inputMethod.GetValue();
}