AutoBean with Subclasses

Hi,

I have 4 interfaces:

public interface Ainterface{

   getName()/setName();

   getShape()/setShape();

....

}

public interface Binterface extends Ainterface{

   getWidth()/setWidth();

   getHeight()/setHeight();

...

}

public interface Cinterface extends Ainterface{ 

   getRadius()/setRadius();

... 

}

public interface Dinterface {

   Ainterface getA();

   void setA(Ainterface a);

...

}

I have included all interfaces in my AutoBeanFactory.

Question: when I decode/encode Dinterface, how do I know if Ainterface is extended by Binterface or Cinterface? How does AutoBean support polymorphism? 

To make it easier, I can add a variable (for ex, shape) in Ainterface to indicate which Binterface or Cinterface I have and then cast Ainterface to Binterface/Cinterface. However, I run into ClassCastException. Should I have separate interfaces; one that consists Binterface and one consists Cinterface? Is there other solution to this problem? 

Thank you,

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