The way that I understand your question is "If I change part of the framework, do I need to redistribute all of the source code of my application, even the parts that aren't part of the framework?". If that is the proper interpretation of your question, then no, you do not need to distribute all the code of your application.
EPL is a weak copyleft license, however it is a non-viral copyleft so it only applies to the source of what was EPL'ed, not to what you build on top of the EPL project. Thus, it does not require that you distribute the source to your application, only the changes made to the framework itself. The terms of the EPL only apply to the source of the library, not the source of your application. Your application's code will governed by its own license (as you are not redistributing it, ostensibly a simple "I own all the rights to this code" license).
Basically, as long as you are not using a library governed by a fully copyleft license, then you should be fine.
Disclaimer: I am not a lawyer. Do not take this as real legal advice.
