// GetCalculator Factory Method
private static IChangeCalculator GetCalculator(decimal amountOwed)
{
IChangeCalculator changeCalculator;
//NOTE: The specifications said if the amount is a multiple of 3 and gave $3.33 as an example of this, but 3.33 is not a multiple of 3, so
// I made the assumption that I should check if the amount owed in cents is a multiple of 3.
if (amountOwed == 0 || (amountOwed * 100) % 3 != 0)
{
changeCalculator = new LargestDenominationFirstChangeCalculator();
}
else
{
changeCalculator = new RandomizedChangeCalculator();
}
return(changeCalculator);
}
public IDictionary <ICurrencyDenomination, int> GetChange(PurchaseTransaction transaction, IEnumerable <ICurrencyDenomination> denominationsAvailable)
{
var changeCalculator = new LargestDenominationFirstChangeCalculator();
return(changeCalculator.GetChange(transaction.AmountReceived - transaction.AmountOwed, denominationsAvailable));
}