//use case 2.7
public void changeQuantity(int user, int product, int newAmount)
{
if (product < 0)
{
throw new ILLArgumentException("invalid product id");
}
if (newAmount <= 0)
{
throw new AlreadyExistException("ERROR: quantity should be a positive number");
}
db.changeQuantity(user, product, newAmount);
}
//use case 2.7
public void changeQuantity(Session user, int product, int store, int newAmount)
{
if (product < 0)
{
throw new ArgumentException("invalid product id");
}
if (store < 0)
{
throw new ArgumentException("invalid store id");
}
if (newAmount <= 0)
{
throw new IllegalAmountException("ERROR: quantity should be a positive number");
}
db.changeQuantity(user, product, store, newAmount);
}
