How can I get OVD to change an attribute's value when queried from a database adapter...

I'd like to change the value of an attribute when it is queried from a database adapter...I assume I need a custom plug-in to do this. It is not a simple if attribute =x then return y. I need to pass the attribute to another Java class and use the returned value in place of the original attribute. There seems to be a dearth of information on creating custom plug-ins.

I've seen the white papers on this (two of them) and they're not very helpful, other than telling me I need to overload the com.octetstring.vde.chain.BasePlugin class. I assume I'd overload the get method...