public BasketItem(Product product, NonNegativeQuantity quantity)
{
_id = Guid.NewGuid();
_price = product.price;
_product_id = product.id;
_quantity = quantity;
}
public void add(Product product)
{
// TODO: Check for null values and invalid data
if (basket_contains_an_item_for(product))
get_item_for(product).increase_item_quantity_by(new NonNegativeQuantity(1));
else
_items.Add(BasketItemFactory.create_item_for(product));
DomainEvents.raise(new BasketPriceChanged(this._id, amount_to_pay()));
}
public bool contains(Product product)
{
return _product_id == product.id;
}
public void change_quantity_of_product(NonNegativeQuantity quantity, Product product)
{
// TODO: Check for null values and invalid data
if (basket_contains_an_item_for(product))
{
if (quantity.is_zero())
{
remove_product_with_id_of(product.id);
}
else
get_item_for(product).change_item_quantity_to(quantity);
DomainEvents.raise(new BasketPriceChanged(this._id, amount_to_pay()));
}
}
private BasketItem get_item_for(Product product)
{
return _items.Where(i => i.contains(product)).FirstOrDefault();
}
private bool basket_contains_an_item_for(Product product)
{
return _items.Any(i => i.contains(product));
}
public static BasketItem create_item_for(Product product)
{
return new BasketItem(product, new NonNegativeQuantity(1));
}
