IDoc XML to/from IDoc Flat Conversion - source code

Hello,

I'm looking for the source codes (Java) for the standard modules below.

IDOCXmlToFlatConvertor

IDOCFlatToXmlConvertor

The codes will be implemented in Java application (external tool), in which the aim is to convert the IDoc XML to IDoc Flat without using the SAP PI/PO.

Appreciate your inputs here.

Thanks,

Fred