11# Decorator패턴 Structural Patterns

 

static void Main(string[] args) {     //BuilderExample();     //FactoryExample();     //FactoryMethodExample();     //FactoryMethodExample2();     //ProtoTypeExample();     //SingletonExample();     //AdapterExample();     //BridgeExample();     //CompositeExample();       DecoratorExample();       //Console.WriteLine("Hello World!");     Console.ReadKey(); }   static void DecoratorExample() {     Book book = new Book("Worley", "Inside asp.net", 10);     book.Display();       Video video = new Video("spielberg", "jaws", 92, 23);     video.Display();       Console.WriteLine("\nMaking video borrwable :");       Borrowable borrowable = new Borrowable(video);     borrowable.BorrowItem("customer #1");     borrowable.BorrowItem("customer #2");       borrowable.Display(); }   main.cs

 

using System; using System.Collections.Generic; using System.Text;   namespace DesignPatterns.Structural_Patterns.Decorator {     public abstract class LibraryItem     {         private Int32 numCopies;           public Int32 NumCopies         {             get => numCopies;             set => numCopies = value;         }           public abstract void Display();     } }   LibraryItem.cs

 

using System; using System.Collections.Generic; using System.Text;   namespace DesignPatterns.Structural_Patterns.Decorator {     public class Decorator : LibraryItem     {         protected LibraryItem libraryItem;           public Decorator(LibraryItem libraryItem)         {             this.libraryItem = libraryItem;         }           public override void Display()         {             libraryItem.Display();         }     } }   Decorator.cs

 

using System; using System.Collections.Generic; using System.Text;   namespace DesignPatterns.Structural_Patterns.Decorator {     public class Borrowable : Decorator     {         private List<string> borrowers = new List<string>();           public Borrowable(LibraryItem libraryItem)             : base(libraryItem)         {           }           public void BorrowItem(string name)         {             borrowers.Add(name);             libraryItem.NumCopies--;         }           public void ReturnItem(string name)         {             borrowers.Remove(name);             libraryItem.NumCopies++;         }           public override void Display()         {             base.Display();               foreach(string borrower in borrowers)             {                 Console.WriteLine(string.Format("borrower : {0}", borrower));             }         }     } }   Borrowable.cs

 

using System; using System.Collections.Generic; using System.Text;   namespace DesignPatterns.Structural_Patterns.Decorator {     public class Book : LibraryItem     {         private string author;         private string title;           public Book(string author, string title, Int32 numCopies)         {             this.author = author;             this.title = title;             this.NumCopies = numCopies;         }           public override void Display()         {             Console.WriteLine("\nBook ------ ");             Console.WriteLine(" Author: {0}", author);             Console.WriteLine(" Title: {0}", title);             Console.WriteLine(" # Copies: {0}", NumCopies);         }     } }   Book.cs

 

using System; using System.Collections.Generic; using System.Text;   namespace DesignPatterns.Structural_Patterns.Decorator {     public class Video : LibraryItem     {         private string director;         private string title;         private Int32 playTime;           public Video(string director, string title, Int32 playTime, Int32 numCopies)         {             this.director = director;             this.title = title;             this.playTime = playTime;             this.NumCopies = numCopies;         }           public override void Display()         {             Console.WriteLine("\nVideo ----- ");             Console.WriteLine(" Director: {0}", director);             Console.WriteLine(" Title: {0}", title);             Console.WriteLine(" # Copies: {0}", NumCopies);             Console.WriteLine(" Playtime: {0}\n", playTime);         }     } }   Video.cs

 

참고 사이트

https://www.dofactory.com/net/decorator-design-pattern