DEV475 Mastering Object-Oriented Analysis and Design with UML ...

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DEV475 Mastering Object-Oriented Analysis and Design with UMLDescribe Attributes and AssociationsUse-Case Analysis Steps• Supplement the Use-Case Descriptions• For each Use-Case Realization• Find Classes from Use-Case Behavior• Distribute Use-Case Behavior to Classes• For each resulting analysis class• Describe Responsibilities• Describe Attributes and Associations• Qualify Analysis Mechanisms• Unify Analysis Classes• CheckpointsMastering Object Oriented Analysis and Design with UMLCopyright © 2003 Rational Software, all rights reserved 40Now that we have defined the analysis classes and their responsibilities, and have anunderstanding of how they need to collaborate, we can continue our documentationof the analysis classes by describing their attributes and associations.The purpose of Describe Attributes and Operations is to:• Identify the other classes on which the analysis class depends.• Define the events in other analysis classes that the class must know about.• Define the information that the analysis class is responsible for maintaining.6 - 40
Module 6 - Use-Case AnalysisReview: What Is an Attribute?Review: What Is an Attribute?ClassNameAttribute : Type = InitValueAttribute : Type = InitValueAttribute : Type = InitValueIn analysis, do not spendtime on attribute signaturesCourseOfferingattributenumber : String = "100"startTime : TimeendTime : Timedays : EnumnumStudents : IntMastering Object Oriented Analysis and Design with UMLCopyright © 2003 Rational Software, all rights reserved 41Attributes are used to store information. They are atomic things with noresponsibilities.The attribute name should be a noun that clearly states what information the attributeholds. The description of the attribute should describe what information is to bestored in the attribute; this can be optional when the information stored is obviousfrom the attribute name.During Analysis, the attribute types should be from the domain, and not adapted tothe programming language in use. For example, in the above diagram, enum willneed to be replaced with a true enumeration that describes the days theCourseOffering is offered (for example, MWF or TR).6 - 41
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