FunctionValues vs DoubleValuesSource

[Sokolov, Michael]

Hi, I'm trying to implement a complex set of values computed according 
to some externally-driven specification, so I am looking at these APIs. 
My question is whether there is any way to mix them. I have implemented 
some DoubleValuesSources and now I want combine them using sum, max, 
etc. I noticed these handy classes over in 
o.a.l.queries.function.valuesource, but they seem to be of a different 
flavor than the DVS API is designed for. EG DVS is kind of an iterative 
API while the functions appear to be random access (you pass them a 
docid). I could code up my own DVS for functions like max, sum and so 
on, but I wonder if there is some kind of adapter, or at least a 
reasonable strategy that would let one mix these apis?

-Mike

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