July 2001
Intermediate to advanced
656 pages
15h 51m
English
book
Applying UML and Patterns: An Introduction to Object-Oriented Analysis and Design and the Unified Process, Second Edition
by Craig Larman
Content preview from Applying UML and Patterns: An Introduction to Object-Oriented Analysis and Design and the Unified Process, Second Edition
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17.6. Object Design: endSale
The endSale system operation occurs when a cashier presses a button indicating the end of a sale. Here is the contract:
Contract CO3: endSale
|
Choosing the Controller Class
Our first choice involves handling the responsibility for the system operation message endSale. Based on the Controller GRASP pattern, as for enterItem, we will continue to use Register as a controller.
Setting the Sale.isComplete Attribute
The contract postconditions state:
Sale.isComplete became true (attribute modification).
As always, Expert should be the first pattern considered ...
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