CSC307 Lecture 12

Introduction to Software Engineering
Design Patterns III
(202307)

Transcript

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   CSC 307
   Introduction to Software Engineering
   Lecture 12:
   Design Patterns III
   Dr. Javier Gonzalez-Sanchez
   javiergs@calpoly.edu
   www.javiergs.com
   Building 14 -227
   Office Hours: By appointment
   

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   GoF Patterns
   

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   Decorator & Composite
   Design Patterns
   

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   Decorator
   

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   Decorator
   

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   Decorator
   

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   abstract class Component {
   public abstract void operation();
   }
   Component
   

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   class ConcreteComponent extends Component {
   @override
   public void operation() {
   System.out.print("ConcreteComponent-Operation()");
   }
   }
   ConcreteComponent
   

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   abstract class Decorator extends Component {
   protected Component component;
   public void setComponent(Component component) {
   this.component = component;
   }
   @override
   public void operation() {
   if (component != null) {
   component.operation();
   }
   }
   }
   Decorator
   

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    class ConcreteDecoratorA extends Decorator {
    @override
    public void operation() {
    super.operation();
    System.out.println("ConcreteDecoratorA-Operation()”);
    }
    }
    ConcreteDecoratorA
    

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    class ConcreteDecoratorB extends Decorator {
    @override
    public void operation() {
    super.operation();
    addedBehavior();
    System.out.println("ConcreteDecoratorB-Operation()");
    }
    void addedBehavior() {
    }
    }
    ConcreteDecoratorB
    

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    class MainApp {
    static void main() {
    // Create ConcreteComponent and two Decorators
    ConcreteComponent c = new ConcreteComponent();
    ConcreteDecoratorA d1 = new ConcreteDecoratorA();
    ConcreteDecoratorB d2 = new ConcreteDecoratorB();
    // Link decorators
    d1.SetComponent(c);
    d2.SetComponent(d1);
    d2.Operation();
    }
    }
    Main
    

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    class MainApp {
    static void main() {
    // Create ConcreteComponent and two Decorators
    ConcreteComponent c = new ConcreteComponent();
    ConcreteDecoratorA d1 = new ConcreteDecoratorA();
    ConcreteDecoratorB d2 = new ConcreteDecoratorB();
    // Link decorators
    d1.SetComponent(c);
    d2.SetComponent(d1);
    d2.Operation();
    }
    }
    Main
    ConcreteComponent - Operation()
    ConcreteDecoratorA - Operation()
    ConcreteDecoratorB - Operation()
    

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    § Both allow you to change how an object behaves
    § The decorator pattern can be used to make it possible to extend (decorate)
    the functionality of a certain object at runtime.
    § Inheritance adds behavior at compilation-time.
    Decorator vs Inheritance
    

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    Scenario
    CompanionHelper
    CompanionTroll
    Companion
    

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    Scenario
    CompanionHelper
    CompanionTroll
    Companion
    CompanionTrollHelper
    

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    Scenario
    CompanionHelper
    CompanionTroll
    Companion
    CompanionTrollHelper
    

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    Test Yourselves
    Connecting all
    

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    Assignment 03
    

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    Assignment 03
    

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    Assignment 03 - UI
    Main
    JFrame ActionListener
    PlotPanel
    JButton
    Run
    

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    Assignment 03 – Observer Pattern
    Main
    Observable
    PlotPanel
    Run
    Source
    Observer
    

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    Assignment 03 – Decorator Pattern
    Main
    PlotPanel
    Observer
    Worker
    WorkerStandard
    Tool
    ToolLine ToolSquare
    

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    Assignment 03 – Decorator Pattern
    ToolBar
    ToolSquare
    WorkerStandard
    ToolSquare
    WorkerStandar
    WorkerStandar
    

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    Assignment 03 – Singleton Pattern
    PlotPanel
    Run
    << Singleton >>
    Configurator
    

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    Source
    

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    World (1/2)
    

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    World (2/2)
    

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    PlotPanel
    

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    WorkerStandard
    

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    WorkerTool
    

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    WorkerToolLine
    

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    ToolSquare
    

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    Questions
    

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    Office Hours
    Tuesday and Thursday 3 - 5 pm
    But an appointment required
    Sent me an email – javiergs@calpoly.edu
    

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    CSC 307
    Introduction to Software Engineering
    Lab 12:
    Complete Assignment 02
    Dr. Javier Gonzalez-Sanchez
    javiergs@calpoly.edu
    www.javiergs.com
    Building 14 -227
    Office Hours: By appointment
    

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    Part A
    Requirements
    

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    Let’s Work
    Let’s review Assignment 01
    

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    Part B
    Design Patterns
    

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    Project – User selects Cluster and clicks Run
    ✅
    ✅
    

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    CSC 307 Introduction to Software Engineering
    Javier Gonzalez-Sanchez, Ph.D.
    javiergs@calpoly.edu
    Summer 2023
    Copyright. These slides can only be used as study material for the class CSC308 at Cal Poly.
    They cannot be distributed or used for another purpose.
    

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