A TYPE SAFE DESIGN TO ALLOW THE SEPARATION OF DIFFERENT RESPONSIBILITIES INTO PARALLEL HIERARCHIES

Francisco Ortin, Miguel García

2011

Abstract

The Tease Apart Inheritance refactoring is used to avoid tangled inheritance hierarchies that lead to code duplication. This big refactoring creates two parallel hierarchies and uses delegation to invoke one from the other. One of the drawbacks of this approach is that the root class of the new refactored hierarchy should be general enough to provide all its services. This weakness commonly leads to meaningless interfaces that violate the Liskov substitution principle. This paper describes a behavioral design pattern that allows modu-larization of different responsibilities in separate hierarchies that collaborate to achieve a common goal. It allows using the specific interface of each class in the parallel hierarchy, without imposing a meaningless interface to its root class. The proposed design is type safe, meaning that the compile-time type checking ensures that no type error will be produced at runtime, avoiding the use of dynamic type checking and re-flection.

Paper Citation

in Harvard Style

Ortin F. and García M. (2011). A TYPE SAFE DESIGN TO ALLOW THE SEPARATION OF DIFFERENT RESPONSIBILITIES INTO PARALLEL HIERARCHIES . In Proceedings of the 6th International Conference on Evaluation of Novel Approaches to Software Engineering - Volume 1: ENASE, ISBN 978-989-8425-57-7, pages 15-25. DOI: 10.5220/0003418000150025

in Bibtex Style

@conference{enase11,
author={Francisco Ortin and Miguel García},
title={A TYPE SAFE DESIGN TO ALLOW THE SEPARATION OF DIFFERENT RESPONSIBILITIES INTO PARALLEL HIERARCHIES},
booktitle={Proceedings of the 6th International Conference on Evaluation of Novel Approaches to Software Engineering - Volume 1: ENASE,},
year={2011},
pages={15-25},
publisher={SciTePress},
organization={INSTICC},
doi={10.5220/0003418000150025},
isbn={978-989-8425-57-7},
}

in EndNote Style

TY - CONF
JO - Proceedings of the 6th International Conference on Evaluation of Novel Approaches to Software Engineering - Volume 1: ENASE,
TI - A TYPE SAFE DESIGN TO ALLOW THE SEPARATION OF DIFFERENT RESPONSIBILITIES INTO PARALLEL HIERARCHIES
SN - 978-989-8425-57-7
AU - Ortin F.
AU - García M.
PY - 2011
SP - 15
EP - 25
DO - 10.5220/0003418000150025