//use case 2.6
public void addToCart(Session user, int product, int amount)
{
if (product < 0)
{
throw new ArgumentException("invalid product id");
}
if (amount <= 0)
{
throw new IllegalAmountException("error : amount should be a positive number");
}
db.addToCart(user, product, amount);
}
//use case 2.6
public void addToCart(int user, int product, int amount)
{
if (product < 0)
{
throw new ILLArgumentException("invalid product id");
}
if (amount <= 0)
{
throw new AlreadyExistException("error : amount should be a positive number");
}
db.addToCart(user, product, amount);
}
