public void change_quantity_of_product(NonNegativeQuantity quantity, ProductSnapshot product_snapshot, IBasketPricingService basket_pricing_service)
{
// TODO: Check for null values and invalid data
if (basket_contains_an_item_for(product_snapshot))
{
if (quantity.is_zero())
{
remove_product_with_id_of(product_snapshot, basket_pricing_service);
}
else
{
get_item_for(product_snapshot).change_item_quantity_to(quantity);
}
recalculate_basket_totals(basket_pricing_service);
}
}
public void increase_item_quantity_by(NonNegativeQuantity quantity)
{
_quantity = _quantity.Add(quantity);
}
public void change_item_quantity_to(NonNegativeQuantity quantity)
{
_quantity = quantity;
}
public BasketItem(ProductSnapshot product_snapshot, NonNegativeQuantity quantity)
{
_id = Guid.NewGuid();
_product_snapshot = product_snapshot;
_quantity = quantity;
}