A TYPE SAFE DESIGN TO ALLOW THE SEPARATION OF DIFFERENT RESPONSIBILITIES INTO PARALLEL HIERARCHIES
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 modularization 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 reflection.
Design patterns Refactoring Software design Parametric polymorphism Generics
Francisco Ortin Miguel García
Computer Science Department, University of Oviedo, 33007, Oviedo, Spain
国际会议
13th International Conference on Enterprise Information System(第13届企业信息系统国际会议 ICEIS 2011)
北京
英文
1655-1665
2011-06-08（万方平台首次上网日期，不代表论文的发表时间）