Sounds like you will need a custom parameter page (likely JSP) that will allow the user to supply you the inputs you need. Then you can create a scripted data source in BIRT that will allow you to bind your Java Object to the BIRT report data source.
There are a number of examples on the Dev Share as to how to build a Scripted Data source. Let me know if you need any help hammering out specifics.
Good Luck!
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