By Karl Lieberherr
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Extra resources for Adaptive object-oriented software: the Demeter method
A secondary key is an attribute (or combination of attributes) that may n o t uniquely identify an object instance b u t can describe a set of object instances that share some c o m m o n characteristic. An attribute (customer type) might be used as a secondary key to g r o u p customers as internal to the business organization (subsidiaries or divisions) or external. Many customers could be typed as internal or external at the same time, b u t the secondary key is useful to identify customers for pricing a n d customer service reasons.
Derived associations. Eliminate associations that can b e defined in terms of o t h e r associations because they are r e d u n d a n t . Also eliminate associa tions defined by conditions o n object attributes. • Misnamed associations. Avoid stating how or why a situation occurred; say what it is. • Role names. A d d role n a m e s to describe roles that an object type in an association plays from t h e p o i n t of view of the o t h e r object type. • Qualified associations. A n a m e is usually used to identify a n object within some context, b u t most n a m e s are n o t globally u n i q u e .
I n h e r i t e d operations can be refined by a d d i n g additional behavior. T h e authors indicate that the i m p l e m e n t a t i o n a n d use of many existing object-oriented languages violates these principles. 4 MULTIPLE INHERITANCE Inheritance allows a class to inherit features from a p a r e n t class. Multiple inheritance extends this c o n c e p t to allow a class to have m o r e t h a n o n e p a r e n t class a n d to inherit features from all parents. T h u s , information may be mixed from multiple sources.
Adaptive object-oriented software: the Demeter method by Karl Lieberherr