public PurchasePolicy ComposePurchasePolicy(List <DbPurchasePolicy> dbPurchasePolicies)
{
if (dbPurchasePolicies.Count == 0)
{
return(new BasketPurchasePolicy(new PurchasePreCondition(CommonStr.PurchasePreCondition.allwaysTrue)));
}
else
{
Dictionary <DbPurchasePolicy, List <DbPurchasePolicy> > purchasePolicyGraph = BuildPurchPolicyGraph(dbPurchasePolicies);
DbPurchasePolicy root = GetPurchaseRoot(purchasePolicyGraph);
return(ConstrucuctPurchasePolicyRecursive(purchasePolicyGraph, root));
}
}
private Dictionary <DbPurchasePolicy, List <DbPurchasePolicy> > BuildPurchPolicyGraph(List <DbPurchasePolicy> dbPurchasePolicies)
{
Dictionary <DbPurchasePolicy, List <DbPurchasePolicy> > graph = new Dictionary <DbPurchasePolicy, List <DbPurchasePolicy> >();
foreach (DbPurchasePolicy dbPurchasePolicy in dbPurchasePolicies)
{
if (!graph.ContainsKey(dbPurchasePolicy))
{
graph.Add(dbPurchasePolicy, new List <DbPurchasePolicy>());
}
if (dbPurchasePolicy.ParentId != null)
{
DbPurchasePolicy parent = DbManager.Instance.getParentPurchasePolicy(dbPurchasePolicy);
if (!graph.ContainsKey(parent))
{
graph.Add(parent, new List <DbPurchasePolicy>());
}
graph[parent].Add(dbPurchasePolicy);
}
}
return(graph);
}
private PurchasePolicy ConstrucuctPurchasePolicyRecursive(Dictionary <DbPurchasePolicy, List <DbPurchasePolicy> > purchasePolicyGraph, DbPurchasePolicy node)
{
if (purchasePolicyGraph[node].Count == 0)
{
if (node.PurchasePolicyType == CommonStr.PurchasePolicyTypes.ProductPurchasePolicy)
{
int?preCondition = node.PreConditionNumber;
PurchasePreCondition preConditionObj = new PurchasePreCondition((int)preCondition);
if (preCondition != null)
{
if (preCondition == CommonStr.PurchasePreCondition.MaxUnitsOfProductType)
{
return(new ProductPurchasePolicy((int)node.MaxProductIdUnits, preConditionObj, (int)node.PolicyProductId));
}
else if (preCondition == CommonStr.PurchasePreCondition.MinUnitsOfProductType)
{
return(new ProductPurchasePolicy(preConditionObj, (int)node.MinProductIdUnits, (int)node.PolicyProductId));
}
else
{
return(null);
}
}
else
{
return(null);
}
}
else if (node.PurchasePolicyType == CommonStr.PurchasePolicyTypes.BasketPurchasePolicy)
{
int?preCondition = node.PreConditionNumber;
if (preCondition != null)
{
PurchasePreCondition preConditionObj = new PurchasePreCondition((int)preCondition);
if (preCondition == CommonStr.PurchasePreCondition.MaxItemsAtBasket)
{
return(new BasketPurchasePolicy(preConditionObj, (int)node.MaxItemsAtBasket));
}
else if (preCondition == CommonStr.PurchasePreCondition.MinItemsAtBasket)
{
return(new BasketPurchasePolicy((int)node.MinItemsAtBasket, preConditionObj));
}
else if (preCondition == CommonStr.PurchasePreCondition.MaxBasketPrice)
{
return(new BasketPurchasePolicy(preConditionObj, (double)node.MaxBasketPrice));
}
else if (preCondition == CommonStr.PurchasePreCondition.MinBasketPrice)
{
return(new BasketPurchasePolicy((double)node.MinBasketPrice, preConditionObj));
}
else if (preCondition == CommonStr.PurchasePreCondition.allwaysTrue)
{
return(new BasketPurchasePolicy(preConditionObj));
}
else
{
return(null);
}
}
else
{
return(null);
}
}
else if (node.PurchasePolicyType == CommonStr.PurchasePolicyTypes.SystemPurchasePolicy)
{
int?preCondition = node.PreConditionNumber;
if (preCondition != null)
{
PurchasePreCondition preConditionObj = new PurchasePreCondition((int)preCondition);
if (preCondition == CommonStr.PurchasePreCondition.StoreMustBeActive)
{
return(new SystemPurchasePolicy(preConditionObj, node.StoreId));
}
else
{
return(null);
}
}
else
{
return(null);
}
}
else if (node.PurchasePolicyType == CommonStr.PurchasePolicyTypes.UserPurchasePolicy)
{
int?preCondition = node.PreConditionNumber;
if (preCondition != null)
{
PurchasePreCondition preConditionObj = new PurchasePreCondition((int)preCondition);
if (preCondition == CommonStr.PurchasePreCondition.OwnerCantBuy)
{
return(new UserPurchasePolicy(preConditionObj));
}
else
{
return(null);
}
}
else
{
return(null);
}
}
else
{
return(null);
}
}
if (node.PurchasePolicyType != CommonStr.PurchasePolicyTypes.CompundPurchasePolicy)
{
throw new Exception("should be compund purchase type!");
}
List <PurchasePolicy> childrens = new List <PurchasePolicy>();
List <DbPurchasePolicy> dbChildrens = purchasePolicyGraph[node];
foreach (DbPurchasePolicy dbchild in dbChildrens)
{
childrens.Add(ConstrucuctPurchasePolicyRecursive(purchasePolicyGraph, dbchild));
}
return(new CompundPurchasePolicy((int)node.MergeType, childrens));
}