Document (#15726)

Author

Gottlob, G.
Shrefl, M.
Rock, B.

Title

Extending object-oriented systems with roles

Source

ACM transactions on information systems. 14(1996) no.3, S.268-296

Year

1996

Abstract

Shows how class-based object-oriented systems can be extended to handle evolving objects. Class hierarchies are complemented by role hierarchies, whose nodes represent role types that an object classified in the root may take on. At any point in time, an entity is represented by an instance of the root and an instance of every role type whose role it curently plays. In a natural way, the approach extends traditional object oriented concepts, such as classification, object identity, specialization, inheritance, and polymorphism in a natural way. Demonstartes the practicability of the approach by an implementation in Smalltalk. Roles can be provided in Smalltalk by adding a few classes. There is no need to modify the semantics of Smalltalk itself. Role hierarchies are mapped transparently onto ordinary classes. The presented implementation can easily be ported to object-oriented database programming languages based on Smalltalk such as Gemstone's OPAL

Aid

Smalltalk

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