public CalculateOhmValueUseCaseResponse Execute(CalculateOhmValueUseCaseRequest request)
{
// validate the request : if invalid, set response object to invalid and retrn it
if (!IsValidRequest(request))
{
return(response);
}
StandardOhmValueCalculator calculator = new StandardOhmValueCalculator();
try
{
response.calculatedValue = calculator.CalculateOhmValue(request.bandAColor, request.bandBColor, request.bandCColor, request.toleranceBandColor);
response.toleranceValue = resistorColorCode.TranslateToleranceColor(request.toleranceBandColor);
response.success = true;
}
catch (Exception e) {
createErrorResponse(e.Message);
}
return(response);
}
private bool IsValidRequest(CalculateOhmValueUseCaseRequest request)
{
bool bandAColorProvided = request.bandAColor.Length > 1;
bool bandBColorProvided = request.bandBColor.Length > 1;
bool bandCColorProvided = request.bandCColor.Length > 1;
bool toleranceBandProvided = request.toleranceBandColor.Length > 1;
bool isValid = true;
// ensure at least band 1 is provided
if (!bandAColorProvided)
{
// send error message
createErrorResponse("Must provide first band color");
isValid = false;
}
// verify no gap in band colors specified
if (isValid && bandCColorProvided && !bandBColorProvided)
{
createErrorResponse("Can not specify third band without a second");
isValid = false;
}
// verify the band colors provided are valid by consulting with dictionary
if (isValid && !resistorColorCode.isValidBandAtoCColor(request.bandAColor))
{
createErrorResponse("Band A color is invalid. Cannot be " + request.bandAColor + ".");
isValid = false;
}
// test optional band colors
if (isValid && bandBColorProvided)
{
if (!resistorColorCode.isValidBandAtoCColor(request.bandBColor))
{
createErrorResponse("Band B color is invalid. Cannot be " + request.bandBColor + ".");
isValid = false;
}
}
if (isValid && bandCColorProvided)
{
if (!resistorColorCode.isValidBandAtoCColor(request.bandCColor))
{
createErrorResponse("Band C color is invalid. Cannot be " + request.bandCColor + ".");
isValid = false;
}
}
// test tolerance band
if (isValid && toleranceBandProvided)
{
if (!resistorColorCode.IsValidToleranceBandColor(request.toleranceBandColor))
{
createErrorResponse("Tolerance band color is invalid. Cannot be " + request.toleranceBandColor + ".");
isValid = false;
}
}
return(isValid);
}