How to use "multiple" getItem(Map map)?

i have assembler called memberassembler. implemented simple fill method returns list of member's.
i implemented getitem(map id).
if wasn't flex data service assembler regular dao of sort have implemented couple of getmember() methods
member getmember(int memberid),
member getmemberbyusername(string username)
member getmemberbyorganisation , on...

as far can see impossible implement using assemblers. right or have missed here?
i hope have..

any suggestions?

/jonathan

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