Add Decorator Pattern Example

Author: QianMo

Assets/Structural Patterns/Composite Pattern/Exmaple1/CompositePatternExample1.unity

@@ -0,0 +1,162 @@
+//-------------------------------------------------------------------------------------
+//	DecoratorPatternExample1.cs
+//-------------------------------------------------------------------------------------
+
+using UnityEngine;
+using System.Collections;
+using System.Collections.Generic;
+
+//This real-world code demonstrates the Decorator pattern in which 'borrowable' functionality is added to existing library items(books and videos).
+
+namespace DecoratorPatternExample1
+{
+
+ public class DecoratorPatternExample1 : MonoBehaviour
+ {
+ void Start()
+ {
+ // Create book
+ Book book = new Book("Worley", "Inside ASP.NET", 10);
+ book.Display();
+
+ // Create video
+ Video video = new Video("Spielberg", "Jaws", 23, 92);
+ video.Display();
+
+ // Make video borrowable, then borrow and display
+ Debug.Log("\nMaking video borrowable:");
+
+ Borrowable borrowvideo = new Borrowable(video);
+ borrowvideo.BorrowItem("Customer #1");
+ borrowvideo.BorrowItem("Customer #2");
+
+ borrowvideo.Display();
+ }
+ }
+
+ /// <summary>
+ /// The 'Component' abstract class
+ /// </summary>
+ abstract class LibraryItem
+ {
+ private int _numCopies;
+
+ // Property
+ public int NumCopies
+ {
+ get { return _numCopies; }
+ set { _numCopies = value; }
+ }
+
+ public abstract void Display();
+ }
+
+ /// <summary>
+ /// The 'ConcreteComponent' class
+ /// </summary>
+ class Book : LibraryItem
+ {
+ private string _author;
+ private string _title;
+
+ // Constructor
+ public Book(string author, string title, int numCopies)
+ {
+ this._author = author;
+ this._title = title;
+ this.NumCopies = numCopies;
+ }
+
+ public override void Display()
+ {
+ Debug.Log("\nBook ------ ");
+ Debug.Log(" Author: "+ _author);
+ Debug.Log(" Title: "+ _title);
+ Debug.Log(" # Copies: "+ NumCopies);
+ }
+ }
+
+ /// <summary>
+ /// The 'ConcreteComponent' class
+ /// </summary>
+ class Video : LibraryItem
+ {
+ private string _director;
+ private string _title;
+ private int _playTime;
+
+ // Constructor
+ public Video(string director, string title,
+ int numCopies, int playTime)
+ {
+ this._director = director;
+ this._title = title;
+ this.NumCopies = numCopies;
+ this._playTime = playTime;
+ }
+
+ public override void Display()
+ {
+ Debug.Log("\nVideo ----- ");
+ Debug.Log(" Director: "+ _director);
+ Debug.Log(" Title: "+ _title);
+ Debug.Log(" # Copies: "+ NumCopies);
+ Debug.Log(" Playtime: "+ _playTime+ "\n");
+ }
+ }
+
+ /// <summary>
+ /// The 'Decorator' abstract class
+ /// </summary>
+ abstract class Decorator : LibraryItem
+ {
+ protected LibraryItem libraryItem;
+
+ // Constructor
+ public Decorator(LibraryItem libraryItem)
+ {
+ this.libraryItem = libraryItem;
+ }
+
+ public override void Display()
+ {
+ libraryItem.Display();
+ }
+ }
+
+ /// <summary>
+ /// The 'ConcreteDecorator' class
+ /// </summary>
+ class Borrowable : Decorator
+ {
+ protected List<string> borrowers = new List<string>();
+
+ // Constructor
+ 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)
+ {
+ Debug.Log(" borrower: " + borrower);
+ }
+ }
+ }
+}

Assets/Structural Patterns/Decorator Pattern/Exmaple1.meta

@@ -56,12 +56,6 @@
  <Reference Include="UnityEngine.Networking">
  <HintPath>Library\UnityAssemblies\UnityEngine.Networking.dll</HintPath>
  </Reference>
- <Reference Include="UnityEngine.Networking">
- <HintPath>Library\UnityAssemblies\UnityEngine.Networking.dll</HintPath>
- </Reference>
- <Reference Include="UnityEngine.UI">
- <HintPath>Library\UnityAssemblies\UnityEngine.UI.dll</HintPath>
- </Reference>
  <Reference Include="UnityEditor">
  <HintPath>Library\UnityAssemblies\UnityEditor.dll</HintPath>
  </Reference>
@@ -136,6 +130,7 @@
  <Compile Include="Assets\Structural Patterns\Bridge Pattern\Structure\BridgeStructure.cs" />
  <Compile Include="Assets\Structural Patterns\Composite Pattern\Exmaple1\CompositePatternExample1.cs" />
  <Compile Include="Assets\Structural Patterns\Composite Pattern\Structure\CompositeStructure.cs" />
+ <Compile Include="Assets\Structural Patterns\Decorator Pattern\Exmaple1\DecoratorPatternExample1.cs" />
  <Compile Include="Assets\Structural Patterns\Decorator Pattern\Structure\DecoratorStructure.cs" />
  <Compile Include="Assets\Structural Patterns\Facade Pattern\Structure\FacadeStructure.cs" />
  <Compile Include="Assets\Structural Patterns\Flyweight Pattern\Structure\FlyweightStructure.cs" />