get absolute path of .class file

Hi,

I have newbie question about class files 

How to get *.class file absolute path from java project

In standard Action I have DataObject.

Can I get *.class file Path using DataObject.

When I click on *.class file for Edit NEtbeans generates java file and using :

context.getPrimaryFile().getName() I have path for generated java file in netbeans cache.

But I need to get path for selected *.class file