In this case, every time you make a subclass of one class, you also have to make a subclass of another. Cottrell,G.W. Ask Question Asked 9 years, 7 months ago. This is what we mean by the metaclass hierarchy being parallel to the class hierarchy. The Alternative Classes with Different Interfaces smell lacks a common interface for closely related classes, so it can also be considered a certain type of inheritance misuse. As was the case for IS-A hierarchies, inheritance will emerge as a logical feature of the representation. Parallel inheritance hierarchies is really a special case of shotgun surgery. . Google Scholar Using an OO language with static typing (like Java), what are good ways to represent the following model invariant without large amounts of duplication. hierarchies, just as first order logic does for IS-A hierarchies. Those properties, PI, * . Use Move Method and Move Field to combine the hierarchies into one. Every time you make a subclass of one class, you also have to make a subclass of another. in separate, usually sparse, inheritance hierarchies. The only technique able to identify instances of Parallel Inheritance Hierarchies is the one included in HIST [15] that relies on historical information. We expose a case study of a bad smell detection through metrics. : ”Parallelism in Inheritance Hierarchies with Exception”, IJCAI'85, pp.194–202, 1985. Metrics allow to obtain an objective view of the software, so they must be used as instruments to detect bad smells. Thus, messages sent to classes must follow the metaclass inheritance chain. In practice, bad smell detection emerges from human observations. Active 9 years, 3 months ago. Concretely, we focus in the bad smell: Parallel Inheritance Hierarchy, using a metric subset. You can recognize this smell because the prefixes of the class names in one hierarchy are the same as the prefixes in another hierarchy. Parallel Inheritance Hierarchies: A special case of Shotgun Surgery. Parallel Inheritance Hierarchies and Refused Bequest smells lack proper inheritance design, which is one of the key elements in object-oriented programming. Another interesting usage for the factory method pattern is Se- quences of successive extensions can be combined using an extension operator, and parallel exten- , P,, which an individual, b, inherits will be precisely those for which P,(b), . You can recognize this smell because the prefixes of the class names in one hierarchy are the same as the prefixes in another hierarchy. In this case, every time you make a subclass of one class, you also have to make a subclass of another. Parallel inheritance hierarchies is really a special case of shotgun surgery. Duplication in parallel inheritance hierarchies. 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