| layout | pattern |
|---|---|
| title | Decorator |
| folder | decorator |
| permalink | /patterns/decorator/ |
| pumlid | HSV14SCm20J0Lk82BFxf1YF6LaP26ZZizfDVVhjRC-bPDRs_Bc35cyZvAMV3bKU6kao36ehCGQtdms2d3z-yLursshuOKBUWmV43LPNfZEcaaFzA-YWhH_y2 |
| categories | Structural |
| tags |
Wrapper
Attach additional responsibilities to an object dynamically. Decorators provide a flexible alternative to subclassing for extending functionality.
Use Decorator
- To add responsibilities to individual objects dynamically and transparently, that is, without affecting other objects
- For responsibilities that can be withdrawn
- When extension by subclassing is impractical. Sometimes a large number of independent extensions are possible and would produce an explosion of subclasses to support every combination. Or a class definition may be hidden or otherwise unavailable for subclassing