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Pig >> mail # user >> Passing a BAG to Pig UDF constructor?

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Passing a BAG to Pig UDF constructor?
Is it possible to pass a bag to a Pig UDF constructor?

Basically in the constructor I want to initialize some hash map so that on
every exec operation, I can use the hashmap to do a lookup and find the
value I need, and apply some algorithm to it.

I realize I could just do a replicated join to achieve similar things but
the algorithm is more than a few lines and there are some edge cases so I
would rather wrap that logic inside a UDF function. I also realize I could
just pass a file path to the constructor and read the files to initialize
the hashmap but my files are on Amazon's S3 and I don't want to deal with
S3 API to read the file.

Is this possible or is there some alternative ways to achieve the same