design_patterns:gof [AE Wiki]

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====== Gang of four ======
===== Erzeugungsmuster (creational patterns) =====

  * Class pattern
    * [[design_patterns:factorymethod|Factory Method / Virtual Constructor]]: Object creation via method instead of constructor
  * Object pattern
    * [[design_patterns:builder|Builder pattern]]
  * Abstract factory pattern: Group of factories
  * Prototype pattern: Clone method/interface
  * Singleton pattern
  * Multiton pattern (flyweight): Multiple objects based on key (getInstance(key), using a hashmap)
===== Strukturmuster (structural patterns) =====

Class/object composition

  * Adapter/Wrapper: Adapter realizes interfaces, uses method of external class
  * Bridge: Hierarchy of abstractions and implementations
  * Facade: Unified, simplified interface to complex operations involving multiple classes
  * Decorator: Dynamically add/remove methods to an object
  * Flyweight: Large number of object required, where information is shared
  * Composite: Tree-structure to represent part-whole hierarchies (treat part and whole uniformly)
  * Proxy: Class acting as interface to something else.
===== Verhaltensmuster (behavioral patterns) =====

  * Template method: Abstract class which implements invariant code and helper method, while specific implementations are in derived classes
  * Strategy: Defines interface for a method and concrete implementations. Strategies could be choosen on runtime.
  * Iterator: Access of elements in container without exposing underlying representation
  * Interpreter: Using Composite e.g. with Terminal/NonTerminal class representations e.g. to implement an abstract syntax tree