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Data controls provide the abstraction of the business service. Like many artifacts in Oracle ADF, data controls are simply XML definitions of the underlying business services. The XML describes the business service, including what attributes it has and any operations it exposes. So, how do you generate a data control for your business service The good news is that for ADF Business Components, you don t have to. Because the definition of a business service developed using ADF Business Components, specifically the application module, is already XML, ADF Model knows how to work with that definition. Thus, ADF Business Components is already data control ready. All the information defined in the application module, such as the view object instances, their attributes, and their operations, define the fa ade for the business service in a way that ADF Model already understands. This is what you see in the Data Controls panel shown in Figure 11-1.
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Creating a Data Control
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Suppose you create some part of your business service and don t use ADF Business Components; how do you create a data control for that As you might expect, JDeveloper takes care of this for you. Let s take the simple example of a Java class (note, however, that you would follow the same steps even for something more advanced like a web service). You decide to write a Java class in your business service that returns, for example, the duty manager for today s shift. This is an essential part of the business service and needs to be exposed on the UI via ADF Model. First of all, in the Model project, create the class to implement the business functionality. Select File | New and, in the New Gallery dialog, select Java and then Java Class. Add the following code:
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package services; public class ManagementRoster { public String todaysDutyManager() { return "John Smith"; } }
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Of course, this is a trivial example, but it demonstrates the point. Having created the class that implements your business function, you now want to create a data control for this Java class
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Introduction to ADF Model
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so that it can be made available through ADF Model. Simply right-click the class name and select Create Data Control.
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TIP You can also drag and drop the Java class directly onto the Data Controls panel to create the data control. JDeveloper creates the data control that describes the class to allow it to be accessed from the UI through ADF Model. You should now see the associated data control definition file in the Application Navigator, and the data control itself should be visible in the Data Controls panel, as shown in Figure 11-2. You could now drag and drop this data control onto a JSF page if you wish to display the current duty manager. TIP You may need to click the Refresh button on the Data Controls panel to see the new data control.
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Data control definition
Data control
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FIGure 11-2. Data Controls panel after adding a data control for a Java class
With your newfound understanding of data controls, you should now recognize in Figure 11-2 that each of the application modules created in the business service is represented as a data control. NOTe The file DataControls.dcx is also created in your Model project. This file acts as an index for all non ADF Business Components data controls.
Introduction to ADF Model
So with data controls you have one half of the solution, providing a common abstraction of the business services. The second part of the puzzle is the binding, which is responsible for connecting the UI component to the data control. The first thing to recognize is that there are different flavors of binding, because there are different types of UI components; a button requires a different kind of binding than a table component requires, since one is binding to an action and the other to a collection of rows of data. When you create UI components by dragging from the Data Controls panel, JDeveloper offers a choice of UI components. This choice depends on whether you are dropping on the page a data collection, such as Departments, or a single attribute, like CustFirstName. After you make a choice, JDeveloper automatically creates the UI component on the page, creates the binding, and then wires up the various properties of the UI component, like Value, to the binding. NOTe The properties of UI components reference the binding by using Expression Language (EL). This is covered in more detail later in this chapter.
Also note that many UI components can reference the same binding. For example, the Value property of a text field and the Text property of a panel box could both reference the same binding; for example, the binding for the Customer s first name attribute. This would be useful if you wanted the name of the currently selected customer to also appear in the title text of the panel box.
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