Structural Design Patterns
Structural design patterns: Adapter, Bridge, Composite, Decorator, Facade, Flyweight, and Proxy with intents and when-to-use guidance.
Structural design patterns that compose classes and objects into larger structures: Adapter, Bridge, Composite, Decorator, Facade, Flyweight and Proxy, each with intent and when to use it.
Use it when
- You need to wrap, combine or simplify existing components.
- You are comparing Adapter, Decorator, Proxy and Facade.
Watch out for
- Adapter, Decorator and Proxy all wrap an object; they differ in intent (convert, extend, control access).
- Each layer of wrapping adds indirection and can make debugging harder.
The data
Patterns
7 rows
| Name | Intent | When to use |
|---|---|---|
| Adapter | Convert interface of one class to another expected by clients | Integrating incompatible interfaces, legacy code wrapper |
| Bridge | Decouple abstraction from implementation so they vary independently | When both abstraction and implementation need extensibility |
| Composite | Compose objects into tree structures to represent part-whole hierarchies | Tree structures, recursive composition, uniform treatment |
| Decorator | Attach additional responsibilities to an object dynamically | Adding behavior without subclassing, open/closed principle |
| Facade | Provide a unified interface to a set of interfaces in a subsystem | Simplifying complex subsystems, entry point abstraction |
| Flyweight | Share objects to support large numbers of fine-grained objects efficiently | Memory optimization, many similar objects |
| Proxy | Provide a surrogate or placeholder for another object to control access | Lazy loading, access control, logging, remote objects |
Fields
The shape of this dataset, read from the data itself: every column, its type and a real value. Agents can use this to plan a query without fetching the whole document.
| Section | Field | Type | Example |
|---|---|---|---|
| patterns | name | string | Adapter |
| patterns | intent | string | Convert interface of one class to another expec… |
| patterns | when_to_use | string | Integrating incompatible interfaces, legacy cod… |
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