#Business folder structure diagram license
You will probably need a separate method on the Tiger to enforce whatever safety rules a Tiger license requires. If somehow the political powers force you to allow Tiger 15 licenses, you can create a Tiger as a subclass of Cat, and then you could handle the Tiger license. Imagine you had a simple pet license that would handle dogs and cats. The specialization process works about the same but from the other direction. However, the users of the Pet class would not have to deal with the details and would not need to know what type of Pet is currently being handled. Each subclass would have to have the specific implementation for the operation. If the details of getting or renewing a license were different for each subclass, you would define an abstract operation on the Pet class called renewLicense(). You could create a Pet class-Allowing a loop through all the pets during renewal season without making separate loops for each subclass. Instead of treating them all separately, if you abstract the common features from each class and create a new superclass to house these common features, you could define many of the features only once. Consider that a jurisdiction may have licensing procedures for dogs, cats, tigers, snakes, and alligators. When you have several classes with similar attributes and similar behaviors, you can look for common features. 10.3.2 The Process 10.3.2.1 The Generalization Process In such circumstances, the Generalization/Specialization is considered “complete” or “covering.” It is common in such circumstances to make the superclass abstract. No structure can exist that is not resolved to be one of the subclasses. We made the Structure class an abstract class (in italics) because all structures must be either a Simple Structure or Compound Structure. 10.3.1 Reflexive Structures Using Generalizationįigure 10.30. They must be able to have instances, and all their operations must have a method supplied. If there are abstract operations, the subclasses must eventually resolve the missing methods.Īt the very bottom of an inheritance hierarchy, all the classes must be concrete. As an abstract class cannot have instances, the subclasses must be able to have instances to be useful. If there are abstract classes, they must be superclasses. If a class has an abstract operation, then the class must also be abstract. An abstract operation is an operation with a defined argument list, but no implementation defined, that is, the mechanism for performing the operation’s work is not available.
Equivalently, we can use an after the operation name). We consider the classes with italic names as abstract. The UML specification does not explain what happens if the definition is never found as that is an implementation/language concern. When the closest definition is the found, it is retrieved and used. If it cannot be found in the current subclass, the chain of superclasses above the subclass is examined to find the closest definition. When a feature is requested on a subclass, the definition of the feature is retrieved. Also, note that the role name at the Book end and the Adult Book end is not inherited. We also added new attribute and operations on the Book subclasses. As previously discussed, we did not have to show these as the association would be inherited naturally.
We show that this feature is inherited in A dult Book by showing ^author: Person on the end of the association. We show that this feature is also inherited in Juvenile Book by showing ^author: Person. On Book, we also added another property, that of author: Person. Modelers often grayed out the feature name to indicate that it was inherited. In earlier versions of UML, there was no (^) notation to indicate inherited features. However, you can have each subclass use its own triangle, and the direction can be in any orientation, subject to considerations on readability. We normally draw the generalization triangle pointing up and have all the subclasses sharing the same triangle in a tree-like shape. For substitution to work, all the features of the superclass (e.g., attributes, operations, constraints, signals, receptions, and association) that are available on the superclass must also be available on the subclass.
The specialization relationship allows a subclass (the bottom end) to substitute for the superclass (the end with the arrowhead). Structure Diagrams and Behavior Diagrams are children of DiagramĪ Diagram is a parent of Structure Diagram and Behavior Diagram We might read the top relationships of this diagram as:Ī Structure Diagram is a kind of (or sort of) DiagramĪ Structure Diagram is a specialization of a DiagramĪ Diagram is a generalization of Structure Diagram and Behavior Diagram
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