public void CheckOut(DateTime timestamp, int patronId, CheckoutPolicy checkoutPolicy)
{
CheckOutTimestamp = timestamp;
HeldByPatronId = patronId;
CheckoutPolicy = checkoutPolicy;
CalculateDueDate();
}
public Material(string classification, string title, string author, string year, CheckoutPolicy checkoutPolicy)
{
Classification = classification;
Title = title;
Year = year;
Author = author;
CheckoutPolicy = checkoutPolicy;
}
public void CheckOut(DateTime timestamp, string barcode, int patronId, CheckoutPolicy checkoutPolicy)
{
Retrieve(barcode).CheckOut(timestamp, patronId, checkoutPolicy);
}
private void CalculateDueDate()
{
DueDate = CheckOutTimestamp.AddDays(CheckoutPolicy.MaximumCheckoutDays());
}