public object Execute(object system)
{
PurchaseOrder purchaseOrder = null;
PetStore ps = (PetStore)system;
long id = ps.nextPurchaseOrderId();
if (!PurchaseOrder.checkCreate(id, ps.getAccount(accountLogin), this.shippingInfo, this.billingInfo, this.items, PrevalenceEngine.Now))
{
throw new ArgumentException("Invalid purchase order parameters.");
}
purchaseOrder = new PurchaseOrder(id, ps.getAccount(accountLogin), shippingInfo, billingInfo, items, PrevalenceEngine.Now);
ps.addPurchaseOrder(purchaseOrder);
return(purchaseOrder);
}
