Design Patterns Explained

Chapter 2O • The Analysis Matrix 299
In a similar vein, I can look at the columns. Each column describes 7. Identify design
which rules to use for each case. These entries represent the family patterns from this
of objects needed for that case. This sounds like the Abstract Factory analysis: look at col-
pattern. This is shown in Table 20-10. umns
Table 2O-1O Implementing with the Abstract Factory Pattern
Armed with the information that some of the rows represent a 8. Develop a Strategy
pattern and each column represents a family in an Abstract high-level design Factory
pattern, I can develop a high-level application design as shown in Figure 20-1.
Field Notes
In practice, almost any kind of pattern that involves polymorphism
could be present in the Analysis Matrix. Of the patterns I've presented,
this would include Bridge, Decorator, Template, and
Observer. Other patterns I have used in an Analysis Matrix are
Composite, Proxy, Chain of Responsibility, Command, Iterator,
Mediator, and Visitor.
Other patterns
present