Building an OMT-editor using design patterns: an experience report

This paper discusses the development and implementation of a customizable editor for OMT/UML style object-models and behavior-models. A number of well known design patterns are used to obtain a flexible architecture that allows to build tool support for our software engineering research requiring variants or add-ons to the basic editors. We report on the difficulties we encountered in applying the Model-View-Control, Observer, Visitor, Iterator, Bridge, Facade and Chain of Responsibility patterns and we evaluate the claims of improved flexibility, modularity, reusability, and understandability as stated in the design pattern literature in general