UML Weekend Crash Course™ - To Parent Directory

Session 13—Modeling the Static View: The Object Diagram 145
Test case 3
Is there evidence that a CustomProduct may be configured into another CustomProduct
Figure 13-7 shows that the test case revealed the need to support aggregation between
one CustomProduct and other CustomProducts. For example, a component stereo system,
consisting of five VendorProducts, could become part of a home entertainment center.
802: CustomProduct
5467: Shipment
775: CustomProduct
456: CustomProduct
312: CustomProduct
0..*
VendorProduct
0..1
Shipment
0..1
2..*
0..1
CustomProduct
0..*
0..*
0..1
Figure 13-7
(bottom)
The Object diagram (top) and the resulting updated Class diagram
Test case 4
Are there any common characteristics among the objects used to configure CustomProduct
Figure 13-8 shows that both CustomProducts and VendorProducts can be part of a
CustomProduct. This common property can be generalized. That is, you can create a generalized
class to contain what the two types of products have in common. The new aggregation
association says that any type of Product (VendorProduct or CustomProduct) may participate
in the assembly of a CustomProduct.
Both classes also define the same type of association with Shipment. This too can be
moved up to the generalized class. A single association from Shipment to Product says that
any type of Product (VendorProduct or CustomProduct) may be shipped.