Structural Design Patterns

Table of Contents

• Adapter
• Composite
• Decortor
• Facade

Adapter

• Bridge between 2 interfaces (Useful when we work with Legacy code)

Disadvantages

• No new functionalities
• Multiple Adapters

Composite

• Tree structure
• Component
• Leaf
• Composite

Disadvantages

• Very costly to create more composite impl
• Overly simple

Decorator

• Wrapper
• Add functionality or behavior
• Single Responsibility Principle
• Dynamically compose behavior
• Inheritance and Composition

Disadvantages

• New Class for every feature
• no of objects (more)
• more comples for the clients

Facade

• Make API easy
• Interface not required
• usually a refactoring pattern

Disadvantages

• Over usage
• Clean up design pattern