vb.net free barcode dll Common Business Service Coding Examples in Java

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Common Business Service Coding Examples
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TIp For a cancelled order, this code will prevent the update of all order attributes; however, the parameter index indicates which attribute is being checked, so you have the flexibility to decide which attributes are updateable and which are not.
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Coding in the View Object
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While the entity object defines a cache for application data, a view object defines applicationspecific views of that data. This means that if you want to programmatically manipulate only a specific view of data, either changing the filter applied to that view object or updating a view object attribute, you can do so in a subclass of ViewObjectImpl or ViewRowImpl. Let s take a look at some common examples of programmatically manipulating the view object.
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Dynamically Setting a View Criteria
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Consider the example that for the OrdersView view object, you want to either create your own search feature or, depending on some runtime action, filter that view object. In this case, you can add code to the OrdersViewImpl class to dynamically filter the view by applying a view criteria. The first step is to create a view criteria on OrdersView called OrdersModeViewCriteria that uses a bind variable to filter OrderMode.
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Now generate the OrdersViewImpl class, ensuring that you choose to include bind variable accessors. You can then add the following code:
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public void changeOrderModeFilter(String mode) { ViewCriteria vc = getViewCriteria("OrdersModeViewCriteria"); setOrderModeBind(mode); applyViewCriteria(vc); executeQuery(); }
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This will find the view criteria, and then use a generated bind variable accessor to set the value of the bind variable. The code will then apply the view criteria and re-execute the query. If you choose to expose this method to the UI, you must expose it in the client interface. This feature can be found under the Java tab of the OrdersView view object editor. You can then bind to this method and parameter from the UI by dragging and dropping the method from the Data Controls panel onto the page, as shown next, to provide a custom search feature on orders.
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TIp You may want to set ChangeEventPolicy to ppr on the binding to ensure that the table of orders is refreshed when the button is clicked.
Changing Values Across a View Object
The code you have just written controls which rows the view object will retrieve; however, suppose you want to write code that operates on a specific row. Let s assume that you want to be able to apply a discount to a customer s orders. This might be a useful feature to expose to the application operators so that if they are speaking to a customer who is considering moving suppliers, the operator can apply a one-time loyalty discount to encourage the customer to remain as a customer. This will require that, for a specific customer, the code iterate through the orders view object and apply the discount on the order total for any open orders. To do this, generate the CustomersViewRowImpl class, which represents a single customer row. Because CustomersView and OrdersView are linked by a view link, and that view link defines an accessor, the CustomerViewRowImpl class can access the orders for that customer using getOrdersView(). You can therefore add the following code to CustomersViewRowImpl:
public void applyLoyaltyDiscount() { final Number OPEN_ORDER = new Number(1); final Number DISCOUNT = new Number(50); //Get the orders for this customer RowSet orders = (RowSet)getOrdersView(); if (orders != null) {
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Common Business Service Coding Examples
//loop through all the customer orders while (orders.hasNext()) { OrdersViewRowImpl currentOrder = (OrdersViewRowImpl)orders.next(); //if the order is open then apply the discount if (currentOrder.getOrderStatus().equals(OPEN_ORDER)) { //Get the current order total Number orderTotal = currentOrder.getOrderTotal(); //Deduct 50 off the total currentOrder.setOrderTotal((Number)orderTotal .minus(DISCOUNT)); } } } }
TIp As noted before, by also generating the OrdersViewRowImpl class, which represents an order row, the current row can be cast to OrdersViewRowImpl, which means you can use the type-safe methods such as getOrderTotal(). So, looking at the code, it returns the orders for the specific customer and then iterates through those rows. If the order is currently open, then the discount is applied. You could, of course, extend the method to update the promotion code to reflect that a loyalty bonus has been applied and can only be applied once. In order to allow the method to be called from a client, you have to expose it by selecting the Java tab of the CustomersView view object editor and exposing it as a client row interface.
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