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Relations: Abstracting Object Collaborations |
| Stephanie Balzer, Patrick Eugster, Thomas R. Gross, Relations: Abstracting Object Collaborations, ETH Zurich, November 2006. [TR539_2006.pdf] |
| Allowing the description of a collection of objects, the concept of a class is central to object-oriented programming languages, yet, it is inadequate to describe the collaborations that arise from the interactions between these objects. The continued interest in concretizing object interactions - be it on the level of design through patterns, on the level of programming languages through first-class relationship support, or on the level of formal program specification through contracts - indicates that classes alone do not suffice. In this paper, we build upon first-class relationships serving as the module to encapsulate object collaborations. We introduce a novel abstraction to reason upon object collaborations: relations. As relationships allow the description of collections of groups of interacting objects, they can be viewed as sets of object tuples and thus as relations. The abstraction of a relation enables the specification of relationships using discrete mathematics. For example, we can express the structural characteristics of relationships by means of the mathematical properties of their defining relations. |
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