Using a composite structure, we can apply the same operations over both composites and individual object.

The Composite pattern allows us to build structures of objects in the form of trees that contain both composition of objects and individual objects as nodes.

Treat individual objects and compositions of objects uniformly.Here is the summary of the composite pattern. Structures to represent part-whole hierarchies. Compose application and resources objects into tree

Resources and some other resources are available and used for other purpose.

These applications uses resources like system, database etc. There is Monitoring System to monitor applications and resources. Here is the composite design pattern example. So you can see both the primitive and composite objects are handled in similar manner.Providing it in Component class makes it transparent and providing it in Composite class makes it safe. The method Add(), Remove() and GetChild() can be provided in Component or Composite, its transparency vs safety.Them and does the operation on all the elements it has composed, either primitive or composite. It has objects which can be Leaf and Composite as well. Composite has instance of the class Component.Concrete classes Leaf and Composite implements the method Operation().Component class provides the interface Operation().Directories and Files in File system are the best example.Ĭomposite Design Pattern UML Structure Participant classes of composite design pattern.Wherever primitive and composite objects have to be handled in similar manner.When part-whole hierarchy of object has to be represented.Where composite design pattern is applicable?

That means both the primitive and composite object have to be handled in similar manner. Come up with a way to manipulate the primitive and composite object uniformly.To distinguish these objects for manipulation The primitive and composite objects have to be handled differently.The intent of composite design pattern is to compose the object to present part-whole hierarchy and handle both primitive and composite object uniformly. Objects and compositions of objects uniformly. Compose objects into tree structures to represent part-whole hierarchies.Design Patterns > Composite Design Pattern Composite Design PatternĬomposite design pattern is used to handle primitive and composite objects uniformly.

Composite design pattern c