![]() For static elements of a system especially the architecture and design of a system, there are design patterns – the focus of this article. Since a system is made up of static as well as dynamic elements, you will find patterns that can be used for either of these types. The name stuck ever since and the patterns catalog that they documented is known as the GOF patterns catalog. ![]() These authors came to be known as the “Gang Of Four” or GOF. To sum up, a pattern should have the following characteristicsĮrich Gamma, Richard Helm, Ralph Johnson and John Vlissides first popularized the concept of patterns with their book on design patterns. ![]() Building on this background we will see how to leverage the usefulness of well-known patterns to make application designing a lot easier. Over the previous articles in this series, we explored the different UML diagrams and learned how to model each of the diagrams in a case study application. In addition, UML has a sufficiently extensive and expressive vocabulary to capture the details of patterns. The class diagram in UML can be used to capture the patterns identified in a system. UML provides the perfect tools to do just this. The patterns that we encounter need to be captured and documented in a sufficiently descriptive manner so that they can be referred for future use. This article is all about patterns especially design patterns. So, using patterns in modeling of systems helps in keeping design standardized and more importantly, minimizes the reinventing of the wheel in the system design. The identification of a pattern is also based on the context in which it is used. What is a Pattern?Ī pattern is a commonly occurring reusable piece in software system that provides a certain set of functionality. With software design going the assembly line way, re-usability has become an important criterion in software design. Even though this may sound too extreme, it is undeniable that parts of different software systems may share similar aspects. UML enumeration can be used simply as a data type for attributes, operations, and parameters without an association line in the diagram.Many a time when you design or implement solutions for a software system, you get the feeling of deja-vu. Association from a classifier to an enumeration may be omitted. The relationship says whether an attribute, operation, or operation parameter within a connected classifier uses the enumeration as its type. A new item will be added to the enumeration and you can enter its name.Īn enumeration connects to a class using a UML association relationship. Then click on the Add Item button in the context bar (usually placed below the selected enumeration). First, create a new enumeration or select an existing one. In the diagram editor, you can add other enumeration items using the context bar. Optionally, a numeric or other type value for the literal may be defined. A meaningful enumeration should contain two and more values.Īn item of enumeration is also called enumeration literal. classes).Īn enumeration is represented by its values. The stereotype caption allows us easy to differ from other element types (e.g. The enumeration element is decorated with the «enumeration» stereotype. Enums may be used in a flag mode to support bitwise combinations of particular values.Īn enumeration is depicted as a rectangular box with a name and a line-separated list of items. An enumeration is used as a type of attribute, operation, and operation parameters. What is Enumeration in UML Class Diagram?Ī UML enumeration represents a complete list of all values that a given type may acquire.
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