Class 25: Design Patterns (3): Structual Patterns

Back to Design Patterns (2): Creational Patterns. On to Project Time.

This outline is also available in PDF.

Held: Tuesday, May 4, 2010

Summary: We consider patterns used to describe structures that relate objects and classes.

Related Pages:

EBoard.

Notes:

EC for Convo on Thursday.
EC for CS Table on Friday.

Overview:

Basic wrapper patterns
Group wrapper patterns
Other wrapper patterns
Other creational patterns

Structural Patterns

Structural patterns build structures.
Many of these structures involve objects "wrapping" other objects.
Some don't.

Primary Wrappers

There are two primary wrapper patterns: Adapter and Bridge
Adapters wrap existing classes to meet new interfaces
Bridges handle overlapping hierarchies.

Group Wrappers

There are two patterns that wrap groups of objects: Composite and Facade
Composite wraps groups of similar objects into a single object.
Facade wraps groups of dissimilar objects into a single object.

Additional Wrappers

There are two additional patterns that I think of as wrappers: Decorator and Proxy.
Decorator wraps an object to add functionality.
Proxy wraps an object to permit decoupling.

Other Structual Patterns

There is one additional structural pattern: Flyweight
Flyweight simply says "Sometimes you want to share objects by moving some of the information into the owning object."

Back to Design Patterns (2): Creational Patterns. On to Project Time.

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Related Courses: [CSC223 2007F (Davis)] [CSC223 2004F (Rebelsky)] Misc: [SamR]

Disclaimer: I usually create these pages on the fly, which means that I rarely proofread them and they may contain bad grammar and incorrect details. It also means that I tend to update them regularly (see the history for more details). Feel free to contact me with any suggestions for changes.

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Samuel A. Rebelsky, rebelsky@grinnell.edu

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