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

DEV475 Mastering Object-Oriented Analysis and Design with UMLExample: Finding Entity ClassesExample: Finding Entity Classes• Use use-case flow of events as input• Key abstractions of the use case• Traditional, filtering nouns approach• Underline noun clauses in the use-case flow ofevents• Remove redundant candidates• Remove vague candidates• Remove actors (out of scope)• Remove implementation constructs• Remove attributes (save for later)• Remove operationsMastering Object Oriented Analysis and Design with UMLCopyright © 2003 Rational Software, all rights reserved 20Taking the use-case flow of events as input, underline the noun phrases in the flow ofevents. These form the initial candidate list of analysis classes.Next, go through a series of filtering steps where some candidate classes areeliminated. This is necessary due to the ambiguity of the English language. The resultof the filtering exercise is a refined list of candidate entity classes. While the filteringapproach does add some structure to what could be an ad-hoc means of identifyingclasses, people generally filter as they go rather than blindly accepting all nouns andthen filtering.6 - 20