Lifted Java: a minimal calculus for translation polymorphism

Authors:
Matthias Diehn Ingesman;Erik Ernst
Affiliations:
Department of Computer Science, Aarhus University, Denmark;Department of Computer Science, Aarhus University, Denmark
Venue:
TOOLS'11 Proceedings of the 49th international conference on Objects, models, components, patterns
Year:
2011

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Abstract

To support roles and similar notions involving multiple views on an object, languages like Object Teams and CaesarJ include mechanisms known as lifting and lowering. These mechanisms connect pairs of objects of otherwise unrelated types, and enables programmers to consider such a pair almost as a single object which has both types. In the terminology of Object Teams this is called translation polymorphism. In both Object Teams and CaesarJ the type system of the Java programming language has been extended to support this through the use of advanced language features. However, so far the soundness of translation polymorphism has not been proved. This paper presents a simple model that extends Featherweight Java with the core operations of translation polymorphism, provides a Coq proof that its type system is sound, and shows that the ambiguity problem associated with the so-called smart lifting mechanism can be eliminated by a very simple semantics for lifting.