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Formal Use of Design Patterns and Refactoring
Description
Design patterns has been used very effectively in object-oriented design for a long time. Refactoring is also widely used for producing better maintainable and reusable designs and programs. In this paper, we investigate how design patterns and refactoring rules are used in a formal method by formulating and showing them as refinement laws in the calculus of refinement of component and object-oriented systems, known as rCOS. We also combine refactoring and design patterns to provide some big-step rules of pattern-directed refactoring.
