public decimal CalculateTotal(Order order)
{
decimal currentTotal = 0;
foreach (AbstractCalculator calculator in _calculators)
{
currentTotal = calculator.Calculate(currentTotal, order);
}
return currentTotal;
}
private static decimal CalculateTotal(Order order)
{
decimal total = 0;
foreach (OrderItem item in order.Items)
{
total += (item.Quantity * item.CostPerItem);
}
return total;
}
public abstract decimal Calculate(decimal currentTotal, Order order);
public override decimal Calculate(decimal currentTotal, Order order)
{
return currentTotal + CalculateTotal(order);
}
private decimal GetShippingTotal(Order order)
{
decimal shippingTotal = 0;
foreach (OrderItem item in order.Items)
{
decimal itemShippingCost = ShippingCost * item.Quantity;
if (item.IsFragile)
{
itemShippingCost *= FragileShippingPremium;
}
shippingTotal += itemShippingCost;
}
return shippingTotal;
}
public override decimal Calculate(decimal currentTotal, Order order)
{
return currentTotal + GetShippingTotal(order);
}
private static bool IsNewZealand(Order order)
{
return (order.CountryCode == "NZ");
}
public override decimal Calculate(decimal currentTotal, Order order)
{
if (IsNewZealand(order))
{
return (currentTotal * _gstRate);
}
return currentTotal;
}