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Visualizing View Objects
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Just like entity objects, you can visualize view objects on an ADF Business Components diagram by dragging them from the Application Navigator onto the ADF Business Components diagram. Figure 6-4 shows view objects and view links after some repositioning.
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FIGUre 6-4. Visualizing view objects
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Implementing Calculated Attributes
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You have already been introduced to the concept of a transient attribute in an entity object. You can also have a view object transient attribute: one that is not based on a query or entity object attribute. This is a useful feature of ADF Business Components, allowing a view object to represent an attribute that has a value based on a calculation.
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Calculating the Total for a Line Item
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Consider the following example. The OrderItemsView view object includes attributes to represent the various line items within an order, including UnitPrice and Quantity. It is the data for these attributes that is persisted to the database; however, wouldn t it be useful to have an attribute that shows the total for each order item that is, the product of UnitPrice and Quantity
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Creating the Attribute The first step is to create the transient attribute. Open the view object editor for OrdersItemsView. Select the Attributes tab and select the green plus button to create a new attribute. For Name enter LineTotal, and Type should be Number. You now need to define that this attribute derives its value from the product of two other attributes. Select Expression, since this field is going to be based on an expression, and for Value enter Quantity * UnitPrice.
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View Objects: A Window to Your Data
You will also want to define that LineTotal should be recalculated if either Quantity or UnitPrice changes. To do this, click Edit and select the two attributes into the Selected field to ensure an automatic recalculation. You should also take the opportunity to look at the properties that are available for this attribute. For example, Queryable is set to false and Updatable is set to Never. You would never want to query on this attribute, and you wouldn t want the end user to update it directly. Click OK. At this point you might decide to add some control hints to the attribute, such as a label and a format mask. Again, you can test this new attribute through the ADF Business Component Browser. Notice that when you change either UnitPrice or Quantity, the framework automatically recalculates LineTotal.
Concatenating Attribute Values and Dependencies
Earlier in this chapter you implemented a lookup to bring FirstName and LastName from the Employees entity object. However, you might decide that you want to require this string to be concatenated into a single attribute. A single attribute might be more convenient if, for example, throughout the application you always display the first and last name together when dealing with an account manager.
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In this case, you could introduce a transient attribute into CustomersView, whose value is a concatenation of FirstName and LastName, optionally choosing to set the control hint Display Hint for these two attributes to Hide.
Creating the Attribute Create a transient attribute AccountMgrFullName of type String in CustomersView and set Value to be an expression FirstName + " " + LastName. You can now test using the ADF Business Component Browser. When testing, you might discover a problem. Although the new attribute seems to reflect the correct information, when you change the AccountMgrId for a customer, AccountMgrFullName is not updated. Why is that The reason is quite simple, and there is a simple solution. When you change AccountMgrId, the framework automatically looks up the FirstName and LastName from the Employees entity object and updates those attributes. However, AccountMgrFullName doesn t know it also has to refresh itself when this happens. You therefore have to explicitly mark that AccountMgrFullName should be refreshed when AccountMgrId is changed. To do this, open the view object editor for CustomersView, double-click AccountMgrFullName, select the Dependencies tab, and move AccountMgrId from the Available list to the Selected list.
You can now retest and check that AccountMgrFullName is updated when you enter a new value for AccountMgrId.
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