// Incorporate an external order into business objects
public static OO.Order XmlOrder2OoOrder(XmlOns.Order o)
{
return new OO.Order {
Cust = OO.Customer.Lookup(o.CustId),
Items = (from i in o.Item
select new OO.Item {
Prod = OO.Product.Lookup(i.ProdId),
Price = i.Price,
Quantity = i.Quantity }).ToList()};
}
// Additional preconditions on incorporation
public static void Check(XmlOns.Order o)
{
double gain = 0;
if (OO.Customer.Lookup(o.CustId) == null)
throw new OO.BizException("Unknown customer");
foreach (var i in o.Item)
{
var p = OO.Product.Lookup(i.ProdId);
if (p == null)
throw new OO.BizException("Unknown product");
gain += i.Price * i.Quantity - p.Price * p.Quantity;
}
if (gain <= 0.0)
throw new OO.BizException("No BizCase");
}