Saturday, July 9, 2016

ADF Improved Support for Programmatic View Object

ADF brings improved support for programmatic VO creation. Such VO's are handy, when we want to base VO on alternative data source, such as PL/SQL ref cursor. In ADF developer don't need to worry which framework methods to override, now it is enough to extend from Programmatic View Object Implementation class. This is special framework helper class, designed for programmatic VO support. See example below.

Sample application ( is based on one regular VO, which renders employees table. Programmatic VO renders data for tag cloud component, located below table:

Steps to create programmatic VO are much more simple in ADF Select data source option to be Programmatic in VO creation wizard:

JDEV will create VO with Java implementation classes, extended from ProgrammaticViewObjectImpl class and ProgrammaticViewRowImpl class. These classes will take care for special lifecycle required for programmatic VO behavior. See extends part:

Generated class contains getScrollableData extended method. This is the place to supply data collection for the VO. In my example, I'm creating ArrayList (VO rows) of HashMap's (one HashMap, represents row data of attribute/value pair). Attributes are populated with values and collection is returned back to the framework to manage it. Method is being called automatically by the framework. There are other methods available, to retrieve row by key, etc.:

New framework class allows to work with programmatic VO's easier and leverage framework features. I would expect it would provide better support for programmatic VO data filtering.

VO data is accessed on UI through regular binding expressions:

Initialized by ADF bindings layer:


Karnakar said...

Thank you for bringing out hidden gem

Yash Jain said...


Do we need to override any other methods like executeQueryForcolletion(), hasNextForCollection() for creating rest service using Progrmmatic VO that populates using static data.Please suggest..