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Manage customer orders application module
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Quick Start Guide to Oracle Fusion Development
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Available View Objects shows the various view objects and links between these view objects. For this data model you require the following: 1: View of all customers 2: View of orders for a specific customer 3: View of order items for a specific order 4: View of inventories for a specific order item
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Move instances of each of the preceding view objects from Available View Objects to Data Model, making sure that in Data Model you select the parent node for which the Available View Objects should be a child. This gives you a data model that represents a master with three levels of detail: customers, orders for that customer, order items for that order, and inventory for each order item. Although not required for this use case, some of the other view objects also give you the options of having 5: View of all orders for which an employee is a sales rep 6: View of all inventories 7: View of all products 8: View of customers for which an employee is an account manager
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You can now test the application module in the ADF Business Component Browser to confirm you have the correct data model bringing back the correct data as per the defined relationships.
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Application Module Classes
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As you might have guessed, the declarative information defined for the application modules is backed by a number of framework classes. It is the responsibility of these framework classes to represent the definition of an application module and to create instances for each user. At this stage, a brief introduction to the classes is pretty much all you need.
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The Framework Classes
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Just like entity objects, there are a number of framework classes that are responsible for implementing the features of the application module.
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ApplicationModuleDefImpl
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Just like for the other ADF Business Components artifacts such as view objects and entity objects, the definition of the artifact is held in XML. At runtime a single Java class is instantiated for each application module definition to hold information about that application module definition. This class is oracle.jbo.server.ApplicationModuleDefImpl. Given the fact that you are not looking to change the definition of an application module at runtime, you will probably not want to alter the default framework behavior.
7:
The Application Module
ApplicationModuleImpl
Each instantiation of oracle.jbo.server.ApplicationModuleImpl represents an instance of an application module. Typical methods available in this class include getting information about the database connection and accessing and managing the view object instances.
Customizing Application Module Framework Classes
By default, the framework gives you methods to operate on the application module and the view object instances. You might not have realized, but as you were testing your application module in the ADF Business Component Browser, the buttons to navigate, commit, and rollback are firing these default methods. What if instead of exposing these default methods, you wanted to expose a more businessoriented method. So, remove department would redistribute employees to other departments rather than just simply deleting the department record. For each application module you define, you can ask JDeveloper to generate a subclass of ApplicationModuleImpl into which you can add your own code.
exposing a Subclass of ApplicationModuleImpl
Open the editor for MaintainEmployeesAM and select the Java tab. Select the edit pencil icon to display the Select Java Options dialog. Select Generate Application Module Class: MaintainEmployeesAMImpl. This generates a class MaintainEmployeesAMImpl, which is a subclass of ApplicationModuleImpl. It can do all the things that ApplicationModuleImpl can do, but it does it only for the MaintainEmployeesAM application module. Within this subclass are methods for accessing the view object instances. So, what next Well let s take a really simple example to show how you can access the various view object instances and navigate the selected data. In this case you ll create a method to access all the employees for the currently selected department, and perform an action on each of these records. To keep it really simple, that action will simply be to print out the employee s last name to the JDeveloper console. Add the following code to MaintainEmployeesAMImpl:
public void printEmployeesInDept() { RowSetIterator rsi = getEmployeesView1().createRowSetIterator(null); while (rsi.hasNext()) { Row r = rsi.next(); System.out.println(r.getAttribute("LastName")); } rsi.closeRowSetIterator(); }
NOTe If you took the opportunity to rename any of the view object instance names, then you would have to reflect these changes in the preceding code as well.
Quick Start Guide to Oracle Fusion Development Understanding the Code So what does this code do It s actually fairly straightforward. All you
are doing is looping through a list of employees and printing out an attribute s value. To ensure that your programmatic accessing of the rows doesn t change the current record indicator, and so change the current record in the UI, you use your own instance of a pointer called a RowSetIterator. So, reading from the first line, the code does the following: 1. Define a public method with no return. 2. Create a pointer, which is a RowSetIterator, to point to the rows in the EmployeesView1 instance. 3. While there are still more rows 4. Go to the next row. 5. Print out the LastName attribute of the row. 6. When finished, close the pointer. Of course, this is a trivial example, but it shows the basics of how you might write a method that programmatically accesses instances within the application module.
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