In re-engineering object-oriented legacy code, it is frequently useful to introduce a design pattern in order to improve specific nonfunctional requirements (e.g., maintainability enhancement). This paper presents a methodology for the development of a quality-driven re-engineering framework for object-oriented systems. First, a catalogue of design motifs (primitive design pattern transformations) is presented Then, the transformations for the design patterns in the GoF book are defined as a composition of these primitive transformations. Nonfunctional requirements for the migrant system can be encoded using soft-goal interdependency graphs and can be associated with design pattern transformations that are applied for the migration of an object-oriented legacy system.
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Tahvildari et al. (2003) studied this question.
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