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Quick Start Guide to Oracle Fusion Development
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This method could now be called from a UI page by dragging the method from the Data Controls panel onto a page as, for example, a toolbar button.
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This chapter has taken you through your first steps of programmatically accessing the features of ADF Business Components; in particular, you have learned that: Using a subclass of EntityImpl, you can set attribute values in response to other attribute values changing. Association accessors can be used in the EntityImpl subclass to programmatically access rows in a different entity object. The EntityImpl subclass allows you to override operations such as create, remove, and DML operations. You can programmatically apply a view criteria to a view object in the
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ViewObjectImpl subclass.
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You can write code against a single view object row using the ViewRowImpl subclass.
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Common UI Coding Examples
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Quick Start Guide to Oracle Fusion Development
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hroughout this book, the focus has been on using the declarative framework features to build rich Fusion applications. However, in places the book has dipped into areas where you might typically augment the framework behavior with your own code.
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This chapter introduces some programmatic concepts and provides common examples of where you might choose to write custom UI code. TIp While you are still getting up to speed on the technology, a good mantra to follow would be only add code to the ViewController by exception. That is not to say you should never write code in managed beans to control UI functionality; however, there are two good reasons for considering this code-by-exception rule. First, chances are that the Oracle ADF framework already implements the feature you want to add, obviating the need for you to code it; the problem might just be finding that feature. Second, when you start to write UI-specific code, you may find yourself beset by the intricacies of JSF. So, before you roll up your sleeves and write code, ensure that the use case you are looking to implement can t already be implemented using declarative features of Oracle ADF.
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How to programmatically Access page Bindings
As you have progressed through the book, you have built data-bound pages by dragging and dropping from the Data Controls panel, with JDeveloper automatically wiring each UI component to the underlying data control via a binding. As you start to write real-world applications, occasionally you may need to programmatically access these data-bound UI components. For example, you may want to update or read the value in a UI component or programmatically call a method. You can achieve this programmatic access of business service data and methods by accessing the binding layer from within a managed bean. TIp If you need a refresher, 15 explained how to create a managed bean. As you found out in 11, the binding context provides the binding to your business service, and each page of the application has a binding container that defines the bindings for the UI components on the page. Oracle ADF provides an API that allows you to programmatically access the binding context and the binding container. These are represented by the objects BindingContext and BindingContainer. In order to access the binding for the current page, you require the following code in the appropriate managed bean:
BindingContainer bindings = BindingContext.getCurrent().getCurrentBindingsEntry();
19:
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This code finds the binding context and returns the binding container for the current page. Any time you wish to programmatically access the binding, you would use this code, in which case you may choose to encapsulate the code in a method such as
public BindingContainer getBindings() { return BindingContext.getCurrent().getCurrentBindingsEntry(); }
NOTe On writing this code, you may be prompted to import oracle.binding.BindingContainer and oracle.adf.model .BindingContext. Ensure that these are added to the list of imports.
How to programmatically Access an Attribute Value
Now that you have an object that represents the binding container for a page, you can access those bindings to read and write values from and to the business service. For example, you could assign the following code to a button to read the value of the CustLastName binding and convert it to lowercase:
public void buttonPressBinding(ActionEvent actionEvent) { // Add event code here... AttributeBinding attr = (AttributeBinding)getBindings().getControlBinding("CustLastName"); String selectedCust = (String)attr.getInputValue(); attr.setInputValue(selectedCust.toLowerCase()); }
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