Semantics and Model Driven Design Patterns Instantiation

This paper is focused on the method of the design patterns support which is based on a principle of suggestion of design pattern instances via the semantic marking of model elements or source code fragments and the subsequent transformations of this way marking models or source code. The transformations generate the missing structure of the suggested design pattern instances in a requested form. The method provides the support of design patterns at three levels of abstraction and in this way it enables earlier application of the design patterns into the models and it provides more abstract view on the pattern instances. The emphasis is put also on the support of specialization, concretization and variability of design patterns. The method defines transformations between the supported model levels and the source code. Within the transformations the emphasis is put on the preserving of visibility of pattern instances and on the preserving of the pattern support also at the lower abstraction levels till the source code. Moreover, the transformations are driven by models of patterns and they are designed in the way which provides great adaptability of the transformations results and easy extension of the support about new patterns or custom model structures. Thanks to the continual support of the design patterns at more levels of abstraction and thanks to the transformations between particular model levels and source code, the method tries to achieve the applicability in the area of the iterative, incremental and model driven development.