Object-Oriented Design

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1 Object-Oriented Design Lecture 20 GoF Design Patterns Behavioral Department of Computer Engineering Sharif University of Technology 1

2 GoF Behavioral Patterns Class Class Interpreter: Given a language, define a representation for its grammar along with an interpreter that uses the representation to interpret sentences in the language. Template Method: Define the skeleton of an algorithm in an operation, deferring some steps to subclasses; lets subclasses redefine certain steps of an algorithm without changing the algorithm's structure. Sharif University of Technology 2

3 GoF Behavioral Patterns Object Object Chain of Responsibility: Avoid coupling the sender of a request to its receiver by giving more than one object a chance to handle the request. Chain the receiving objects and pass the request along the chain until an object handles it. Command: Encapsulate a request as an object, thereby letting you parameterize clients with different requests, queue or log requests, and support undoable operations. Iterator: Provide a way to access the elements of an aggregate object sequentially without exposing its underlying representation. Mediator: Define an object that encapsulates how a set of objects interact; promotes loose coupling by keeping objects from referring to each other explicitly. Sharif University of Technology 3

4 GoF Behavioral Patterns Object (Contd.) Object (Contd.) Memento: Without violating encapsulation, capture and externalize an object's internal state so that the object can be restored to this state later. Observer: Define a one-to-many dependency between objects so that when one object changes state, all its dependents are notified and updated automatically. State: Allow an object to alter its behavior when its internal state changes. The object will appear to change its class. Strategy: Define a family of algorithms, encapsulate each one, and make them interchangeable; lets the algorithm vary independently from clients that use it. Visitor: Represent an operation to be performed on the elements of an object structure; lets you define a new operation without changing the classes of the elements. Sharif University of Technology 4

5 Chain of Responsibility Intent: Avoid coupling the sender of a request to its receiver by giving more than one object a chance to handle the request. Chain the receiving objects and pass the request along the chain until an object handles it. Sharif University of Technology 5

6 Chain of Responsibility: Class Hierarchy Sharif University of Technology 6

7 Chain of Responsibility: Structure Sharif University of Technology 7

8 Iterator Intent: Provide a way to access the elements of an aggregate object sequentially without exposing its underlying representation. Sharif University of Technology 8

9 Iterator: Structure Sharif University of Technology 9

10 Mediator Intent: Define an object that encapsulates how a set of objects interact: promotes loose coupling by keeping objects from referring to each other explicitly, and lets you vary their interaction independently. Sharif University of Technology 10

11 Mediator: Typical Collaboration and Class Hierarchy Sharif University of Technology 11

12 Mediator: Structure Sharif University of Technology 12

13 Observer Intent: Define a one-to-many dependency between objects so that when one object changes state, all its dependents are notified and updated automatically. Sharif University of Technology 13

14 Observer: Structure Sharif University of Technology 14

15 Observer: Collaboration Sharif University of Technology 15

16 State Intent: Allow an object to alter its behavior when its internal state changes. The object will appear to change its class. Sharif University of Technology 16

17 State: Structure Sharif University of Technology 17

18 Strategy Intent: Define a family of algorithms, encapsulate each one, and make them interchangeable. Strategy lets the algorithm vary independently from clients that use it. Sharif University of Technology 18

19 Strategy: Structure Sharif University of Technology 19

20 Visitor Intent: Represent an operation to be performed on the elements of an object structure; lets you define a new operation without changing the classes of the elements on which it operates. Sharif University of Technology 20

21 Visitor: Structure Sharif University of Technology 21

22 Visitor: Collaborations Sharif University of Technology 22

23 Reference Gamma, E., Helm, R., Johnson, R., and Vlissides, J., Design Patterns: Elements of Reusable Object-oriented Software. Addison-Wesley, Sharif University of Technology 23

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