public virtual IEnumerable <ValidationResult> Execute(ICreateVehicleCommand vehicle)
{
bool isYearSet = vehicle.Year.HasValue;
bool isMakeSet = !string.IsNullOrEmpty(vehicle.MakeName);
bool isModelSet = !string.IsNullOrEmpty(vehicle.ModelName);
bool isYearValid = true;
bool isMakeValid = true;
bool isModelValid = true;
// Make requires a year
if ((!isYearSet) && isMakeSet)
{
yield return(new ValidationResult("MakeName", Resources.VehicleMissingYearForMake));
isMakeValid = false;
}
// Model requires a year and make
if (isModelSet)
{
if (!isYearSet)
{
yield return(new ValidationResult("ModelName", Resources.VehicleMissingYearForModel));
isModelValid = false;
}
else if (!isMakeSet)
{
yield return(new ValidationResult("ModelName", Resources.VehicleMissingMakeForModel));
isModelValid = false;
}
}
// Validate Year value (if not already invalid)
if (isYearValid)
{
isYearValid = ((!isYearSet) || _manufacturerRepository.IsValidYear(vehicle.Year.Value));
if (!isYearValid)
{
yield return(new ValidationResult("Year", Resources.VehicleYearInvalid));
}
}
// Validate Make value (if not already invalid)
if (isMakeValid)
{
isMakeValid = ((!isMakeSet) ||
(isYearSet &&
_manufacturerRepository.IsValidMake(vehicle.Year.Value, vehicle.MakeName)));
if (!isMakeValid)
{
yield return(new ValidationResult("MakeName", Resources.VehicleMakeInvalid));
}
}
// Validate Model value (if not already invalid)
if (isModelValid)
{
isModelValid = ((!isModelSet) ||
(isYearSet && isMakeSet &&
_manufacturerRepository.IsValidModel(vehicle.Year.Value, vehicle.MakeName,
vehicle.ModelName)));
if (!isModelValid)
{
yield return(new ValidationResult("ModelName", Resources.VehicleModelInvalid));
}
}
}
