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The treasures I have accumulated in my daily java development. It can help other people face the same problem.

API and support runtime classes for implementing immutable objects as set enum-like object values, accumulated in so called "domains". This allows for special performance optiomization, like using bit-sets to efficiently calculate inclusion in set or set differences.

The DSI utilities are a mishmash of classes accumulated during the last twenty years in projects developed at the DSI (Dipartimento di Scienze dell'Informazione, i.e., Information Sciences Department), now DI (Dipartimento di Informatica, i.e., Informatics Department), of the Universita` degli Studi di Milano.