how to wire inheritance in Java config ?

hi,

Current Design-->
BaseManager extends Manager extends Type1DataStoreImpl implements DataStoreInterface
BaseManager is referenced everywhere in the application as
for (DataStoreInterface o:BaseManager.getAllObjects()){};

Modification-->
I have Type2DataStoreImpl implements DataStoreInterface

I want to make minimum changes to the application ie BaseManager & Manager should not be replaced by new classes.

Is there a way I can dynamically plug Type2DataStoreImpl as parent of Manager ( .properties file decides its type1 or type2 implementation) ?

New Design
BaseManager extends Manager extends Type1DataStoreImpl or Type2DataStoreImpl (depending on config file) implements DataStoreInterface

Thanks in advance.

Pls recommend other solutions as well.