June 2010
Intermediate to advanced
536 pages
16h 52m
English
Content preview from PHP Objects, Patterns, and Practice, Third Edition
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CHAPTER 10 ■ PATTERNS FOR FLEXIBLE OBJECT PROGRAMMING
179
and queries transparent to the client. Trees are easy to traverse (as we shall see in the next chapter). It is
easy to add new component types to Composite structures.
On the downside, Composites rely on the similarity of their parts. As soon as we introduce complex
rules as to which composite object can hold which set of components, our code can become hard to
manage. Composites do not lend themselves well to storage in relational databases but are well suited to
XML persistence.
The Decorator Pattern
While the Composite pattern helps us to create a flexible representation of aggregated components, the
Decorator pattern uses a similar structure to help us to modify the functionality ...
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