Cartesian product of an arbitrary number of sets

Do you know some neat Java libaries that allow you to make cartesian product of two (or more) sets?

For example: I have three sets. One with objects of class Person, second with objects of class Gift and third with objects of class GiftExtension.

I want to generate one set containing all possible triples Person-Gift-GiftExtension.

The number of sets might vary so I cannot do this in nested foreach loop. Under some conditions my application needs to make a product of Person-Gift pair, sometimes it is triple Person-Gift-GiftExtension, sometimes there might even be sets Person-Gift-GiftExtension-GiftSecondExtension-GiftThirdExtension, etc.