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Overriding the remove() Method
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This first step is to augment the default behavior when the framework removes a row from the entity object cache by updating the status of the order. To do this, locate the remove() method in the OrdersImpl class and add the following code to set the order.
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public void remove() { final Number ORDER_CANCELLED = new Number(3);
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setOrderStatus(ORDER_CANCELLED); super.remove(); }
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The code simply sets the order status of the order item to indicate it has been cancelled in the data model, this is represented by the value 3 and then performs the default operation of removing the row from the entity object cache. NOTE You would typically define the constant ORDER_CANCELLED outside the method, but it is included here for completeness.
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Overriding the DML Operation
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So far you have updated the order to show it has been cancelled, but these changes have not yet been committed to the database. If the default DML operation now fires, the rows that have been removed from the entity object cache will be removed from the database, which in this case is not what you want. Instead, you want to override the DML operation for the order to perform an update rather than a delete. This ensures that the rows are updated to show the new status and that they are not removed from the underlying database table. In the OrdersImpl class, locate the doDML() method and change the code as follows:
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protected void doDML(int operation, TransactionEvent e) { if (operation == DML_DELETE) { operation = DML_UPDATE; } super.doDML(operation, e); }
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This tricks the Orders entity object into thinking it should perform an update, so that it will never delete an order. TIp You can test this behavior in the ADF Business Components Browser, where you can see the updated order status when you delete an order, commit the change, and then requery the data. However, the fact that you can see the order with the new status might not be exactly what you want, in which case you could change your view object, using a view criteria, to show only orders that have not been cancelled. That way, you still retain archived orders in the database but don t show them to the application user.
Overriding the Check of an updatable Attribute
Of course, adding a view criteria to filter out these cancelled orders would prevent the application user from seeing, and therefore being able to reopen, an order. A more robust strategy might be to simply make a cancelled order read-only in the entity object cache. That way you can ensure that, regardless of the view object being used, the underlying entity object will never allow a cancelled order to be changed.
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To do this, you can override the isAttributeUpdateable() method on the entity object. The framework calls this method to check whether an entity object attribute is updateable. In this case you want to indicate that, for any order that has been cancelled, none of the attributes in the order can be updated. Open the OrdersImpl class and, from the main menu, select Source | Override Methods. This displays the Override Methods dialog, in which you can choose which method you want to override in the OrdersImpl class. Locate isAttributeUpdateable() and click OK.
Now you can change the method as follows:
public boolean isAttributeUpdateable(int index) { final Number ORDER_CANCELLED = new Number(3); if (this.getOrderStatus().equals(ORDER_CANCELLED)) { return false; } return super.isAttributeUpdateable(index); }
NOTE Remember, Number is oracle.jbo.domain.Number and not java.lang.Number, so make sure you use the correct type. So, now when the framework checks to see if an attribute of the Orders entity object is updateable, it will return false for any cancelled order. This will ensure that the framework does not allow a cancelled order to be updated.
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