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Dr. Javier Gonzalez-Sanchez [email protected] www.javiergs.info o ffi ce: 14 -227 CSC 305 Individual Software Design and Development Lecture 15. Decorator Pattern

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Previously

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GoF Patterns 3

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Observer 4

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Singleton 5

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Notes on Decorator | Composite

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Problem 7

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Inheritance Approach 8

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Inheritance Approach 9

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Inheritance Approach 10

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Composite 11

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Decorator | Composite 12

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Decorator vs Inheritance • Both a llow you to ch a nge how a n object beh a ves. • The decor a tor p a ttern a llows you to extend (decor a te) the function a lity of a n object a t runtime. • Inherit a nce a dds beh a vior a t compil a tion time. 13

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Connecting the Dots

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Application 15

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Application | GUI 16 Main JFrame ChartPanel JPanel

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Application | Data Gathering 17 Main JFrame ChartPanel Thread Genius JPanel

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Application | Observer 18 Main JFrame ChartPanel Thread <> Board Genius JPanel PropertyChange Listener PropertyChange Support

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MarkerDecoratorShadow MarkerDecoratorDot MarkerSimple Application | Decorator 19 MarkerDecoratorDot MarkerSimple MarkerSimple

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ChallengePlotter | Main 20 https://github.com/CSC3100/Patterns

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ChallengePlotter | Genius | Runnable 21 https://github.com/CSC3100/Patterns

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ChallengePlotter | Board | Singleton, Observable 22 https://github.com/CSC3100/Patterns

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ChallengePlotter | ChartPanel | Observer 23 https://github.com/CSC3100/Patterns

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ChallengePlotter | Marker | Decorator 24 https://github.com/CSC3100/Patterns

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ChallengePlotter | MarkerDecorator | Decorator 25 https://github.com/CSC3100/Patterns

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ChallengePlotter | MarkerDecoratorBar | Decorator 26 https://github.com/CSC3100/Patterns

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ChallengePlotter | MarkerDecoratorDot | Decorator 27 https://github.com/CSC3100/Patterns

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ChallengePlotter | MarkerSimple | Decorator 28 https://github.com/CSC3100/Patterns

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Questions 29

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Lab 11. Decorator

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Note 31 UML Class Diagram

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CSC 305 Individual Software Design and Development Javier Gonzalez-Sanchez, Ph.D. [email protected] Summer 2024 Copyright. These slides can only be used as study material for the class CSC305 at Cal Poly. They cannot be distributed or used for another purpose.