On the Implementation of @pre

Authors:
Piotr Kosiuczenko
Affiliations:
Institute of Information Systems, WAT, Warsaw
Venue:
FASE '09 Proceedings of the 12th International Conference on Fundamental Approaches to Software Engineering: Held as Part of the Joint European Conferences on Theory and Practice of Software, ETAPS 2009
Year:
2009

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Abstract

The paradigm of design by contract provides a transparent way of specifying object-oriented systems. There exist a number of languages for contractual specification including OCL, JML and Spec#. Nevertheless, there are still a number of research problems concerning this approach. One of them is the implementation of primitive @pre in OCL or equivalently old in JML. Those primitives are used in post-conditions to refer to attribute values in states preceding an operation execution. There are a number of implementations of this operators, but all suffer logical and computational problems. In this paper, existing approaches to the implementation of @pre are discussed and a new solution is proposed.