// Makes sure we can actually calculate a payment:
// - The amortization period enum is valid
// - The down payment is big enough
// - The mortgage period is valid
private void Validate()
{
// Make sure the amortization period enum is valid
if (!ValidatePaymentScheduleOptions.Validate(this.PaymentSchedule))
{
throw new Exception("Invalid PaymentSchedule. Valid values are monthly, biweekly, weekly");
}
// Make sure the down payment is big enough
if (!ValidateDownPaymentLargeEnough.Validate(this.AskingPrice, this.DownPayment))
{
throw new Exception("Downpayment is insufficent for the AskingPrice.");
}
// Make sure the mortgage period is valid (not less than 5 years, not more than 25)
if (!ValidateValidMortgageLength.Validate(this.AmortizationPeriod, this.PaymentSchedule))
{
throw new Exception("Invalid AmortizationPeriod - Must be more than 5 years, less than 25");
}
}