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Now that you ve started to discover and play with the features of entity objects, you might be wondering how the wizards, drag and drop, and setting of properties magically result in the runtime behavior you desire. The simple truth is that the information you have created is used at runtime to instantiate instances of Java classes that drive the framework behavior.
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The Role of the Entity Object
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In many cases you probably will never need to have much more than a passing acquaintance with these framework classes. In other cases they will be your first step out of the declarative world into a place where you can start writing your own code.
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As you learn more and more about Oracle ADF, you will start to become familiar with the various classes that make up the framework, but at the outset the Oracle ADF Java documentation can seem daunting. Which classes or methods are important Which ones should you extend to add your own functionality For an entity object, there are three principal Java classes you will encounter.
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The functionality you ve built in the entity objects so far is purely defined in XML. When you run your application, this XML information is used to instantiate a class oracle.jbo.server .EntityDefImpl, which is the definition of your entity object. There will be one instance of this class per unique entity object definition, and the methods available on this class generally relate to modifying the definition of the entity object. You can think of an instance of this class as a template for the entity object at runtime. At this stage in your learning you ll probably never need to alter the way this works.
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As you would expect, an entity object has to cache rows of data coming back from the database. An instance of oracle.jbo.server.EntityCache is responsible for providing this cache. You can think of EntityCache as a drawer of a filing cabinet where each entity object definition has its own drawer. Again, at this stage you will probably never need to override or directly call methods on this class.
EntityImpl
The EntityImpl class is the entity object framework class you will come into contact with most often. Each instantiation of oracle.jbo.server.EntityImpl equates to a single row of data, and, continuing the analogy of a filing cabinet drawer, it is like a single sheet of paper held in the filing cabinet drawer. When you create a new row of data, the framework instantiates a new instance of EntityImpl. Typical methods available on this class include creating a single row, performing a DML operation on a row, and setting attribute values of a row.
Customizing Entity Object Framework Classes
Now that you ve been introduced to the main entity object classes, how and, more importantly, why would you want to change them The simple answer is that at some point you will probably want to change or augment the default behavior of the framework. You might want to do some additional action when an attribute value is being set, or you may want to perform some logging when a record is deleted. ADF Business Components provides a convenient way to expose a subclass for the entity object classes.
Exposing a Subclass of EntityImpl
As you have just found out, EntityImpl is the class that represents a single row of data in the entity object cache. It provides a whole range of methods for acting on attribute values and the row of data.
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Open the editor for the Customers entity object and select the Java tab. Click the edit pencil icon to display the Select Java Options dialog. Select Generate Entity Object Class: CustomersImpl. This will create a Java class CustomersImpl, which is a subclass of EntityImpl. At this point, you will choose not to generate any of the other entity object classes. Select Accessors, Create Method, Data Manipulation Methods, and Remove Method and click OK.
So what did you just do Well, you asked JDeveloper to create a class that can do all the things EntityImpl can do in Java-speak, a subclass but specifically for the Customers entity object. You have also explicitly requested that the class, called CustomersImpl, expose methods that are used when accessing attribute values, creating a row of data, removing a row of data, and performing DML operations on a row of data. You now have the opportunity to augment any of the methods if you so choose. Go to the Application Navigator and, under the Customers entity object, you should now see the newly created class. Double-click CustomersImpl.java and take a look at what JDeveloper has created, described next.
Accessors Either by using the Java editor or the Structure window, you should see pairs of set and get methods for each attribute in the entity object. For example:
public String getCustLastName() { return (String)getAttributeInternal(CUSTLASTNAME); } public void setCustLastName(String value) { setAttributeInternal(CUSTLASTNAME, value); }
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