PATTERNS -STRUCTURAL PATTERNS WATTANAPON G SUTTAPAK Software Engineering, School of Information Communication Technology, University of PHAYAO 1

จุดประสงค์การเรียนรู้  เข้าใจรูปแบบของแบบรูปการออกแบบทั้ง 8 ประเภท  ประยุกต์ใช้แบบรูปการออกแบบทั้ง 8 ประเภทได้ 2

STRUCTURAL PATTERNS These patterns concern class and object composition Concept of inheritance is used to compose interfaces and define ways to compose objects to obtain new functionalities 1.Adapter 2.Bridge 3.Filter(new) 4.Composite 5.Decorator 6.Façade 7.Flyweight 8.Proxy

ADAPTER PATTERN works as a bridge between two incompatible interfaces. A real life example, card reader(adapter) read memory(object) to laptop(object)

ADAPTER PATTERN

Interface class

ADAPTER PATTERN Implements AdvanceMediaPlayer

ADAPTER PATTERN Implements MediaPlayer

ADAPTER PATTERN demo adapter pattern 9 Result

BRIDGE PATTERN decouple an abstraction from its implementation the two can vary independently. decouples implementation class and abstract class by providing a bridge structure between them. This pattern involves an interface as a bridge functionality of concrete classes independent from interface implementer classes. demonstrating use of Bridge pattern via following example in which a circle can be drawn in different colors using same abstract class method but different bridge implementer classes. 10

BRIDGE PATTERN 11 Shape Square,Triangle, … check duplicate pattern Color Red, Blue, … Shape and Color

BRIDGE PATTERN 12

BRIDGE PATTERN 13

BRIDGE PATTERN 14

BRIDGE PATTERN 15

BRIDGE PATTERN 16

BRIDGE PATTERN 17 Result

FILTER PATTERN filter a set of objects using different criteria combining multiple criteria to obtain single criteria. 18

FILTER PATTERN 19

FILTER PATTERN 20

FILTER PATTERN 21

FILTER PATTERN 22

FILTER PATTERN 23

FILTER PATTERN 24

FILTER PATTERN 25

FILTER PATTERN 26

COMPOSITE PATTERN group of objects in similar way as a single object 27

COMPOSITE PATTERN 28

COMPOSITE PATTERN 29 Result

DECORATOR PATTERN 30 add new properties to existing object without altering structure

DECORATOR PATTERN 31

DECORATOR PATTERN 32 Result

FACADE PATTERN 33 hiding the complexities of the system the client can access the system via interface

FACADE PATTERN 34

FACADE PATTERN 35 Result

FLYWEIGHT PATTERN primary pattern for reduce the number of objects created decrease memory footprint and increase performance demonstrate this pattern by drawing 20 circle of different locations but we'll creating only 5 objects. Only 5 colors are available so color property is used to check already existing Circle objects. 36

FLYWEIGHT PATTERN 37

FLYWEIGHT PATTERN 38

FLYWEIGHT PATTERN 39

FLYWEIGHT PATTERN 40 Result

PROXY PATTERN a class represents functionality of another class In Proxy pattern, we create object having original object to interface its functionality to outer world. 41

PROXY PATTERN 42 Result

PROXY PATTERN 43 Result