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Example of TriggerTargetNavigator
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Joined: 30-May-2007
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Posts: 260 		Post Options Post Options   Quote Customer Quote  Post ReplyReply Direct Link To This Post Topic: Example of TriggerTargetNavigator
    Posted: 03-Aug-2007 at 11:53am
Do you have an example of how the TriggerTargetNavigator is used? I'm trying to implement cross object verification but can't seem to get it to work.
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Posts: 68 		Post Options Post Options   Quote eileenv Quote  Post ReplyReply Direct Link To This Post Posted: 03-Aug-2007 at 12:05pm

The TriggerTargetNavigator represents a delegate for navigating from the trigger object to the object being verified. The navigator can either be a path (PropertyDescriptor) or a custom method capable of bridging the two object types.

Here’s an example taken from the sample app accompanying the Verification Tutorial videos on the website, where the navigator is a path:



///<summary>Get the OrderDateAfterHired Verifier.</summary>


private static Verifier GetOrderDateAfterHiredVerifier() {


  string description = "OrderDate must be after the sales rep's HireDate.";


  DelegateVerifier<Order> v =


    new DelegateVerifier<Order>(description, OrderDateAfterHiredCondition);


  v.ExecutionModes = VerifierExecutionModes.InstanceAndOnPostsetTriggers;


  v.AddTrigger(EntityPropertyDescriptors.Order.OrderDate);


  v.AddTrigger(new TriggerLink(


    EntityPropertyDescriptors.Employee.HireDate, // Triggered by Employee.HireDate


    EntityPropertyDescriptors.Employee.Orders, // Path from trigger (Employee) to Order


    true)); // True = that path returns multiple orders


  return v;


} 

Here’s an example where the navigator is a custom method:

private static Verifier GetOrderDateDiscontinuedProductVerifier() {


  string description = "No orders allowed for discontinued products after 1/1/1998";


  DelegateVerifier<Order> v =


    new DelegateVerifier<Order>(description, GetOrderDateDiscontinuedProductCondition);


  v.ExecutionModes = VerifierExecutionModes.All;


  v.AddTrigger(EntityPropertyDescriptors.Order.OrderDate);


  v.AddTrigger(new TriggerLink(


    EntityPropertyDescriptors.Product.Discontinued, // Triggered by Product.Discontinued


    GetOrdersAssociatedWithProduct, // Method bridging orders and products


    true); // True = that method returns multiple orders


  return v;


}


private static EntityList<Order> GetOrdersAssociatedWithProduct(Object pProduct) {


  Product aProduct = (Product)pProduct;


  OrderDetail[] details = aProduct.GetChildren<OrderDetail>(


    EntityRelations.Product_OrderDetail,


    QueryStrategy.Normal);


  EntityList<Order> orders = aProduct.PersistenceManager.GetParents<Order>(


    details, EntityRelations.Order_OrderDetail, QueryStrategy.Normal);


  return orders;


}
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