[설계 패턴 C#] 빌더 패턴(Builder Pattern)

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Builder.zip

▶Picture.cs

namespace Builder {     class Picture     {         public static readonly Picture EmptyPicture;         static Picture()         {             EmptyPicture = new Picture(string.Empty, string.Empty);         }         public string Subject         {             get;             private set;         }         public string Image         {             get;             private set;         }         public Picture(string subject, string image)         {             Subject = subject;             Image = image;         }     } }

 ▶PictureBuilder.cs

namespace Builder {     abstract class PictureBuilder     {         public Picture Picture         {             get;             protected set;         }         public abstract void SetSubject(string subject); //상을 맺히는 기능         public abstract void Change();//이미지를 수정하는 기능     } }

 

▶SmoothBuilder.cs

namespace Builder {     class SmoothBuilder:PictureBuilder     {         const string sharp = "Sharp";         const string smooth = "Smooth";         string subject;  //원본 피사체         public override void SetSubject(string subject) //상을 맺히는 기능         {             this.subject = subject;             Picture = new Picture(subject, subject);         }         public override void Change()//이미지를 수정하는 기능         {             string image = subject.Replace(sharp,smooth);             Picture= new Picture(subject,image);         }     } }

 

▶REPreventBuilder.cs

namespace Builder {     class REPreventBuilder:PictureBuilder     {         const string red_eye = "RedEye";         const string normal_eye = "NomalEye";         const int max_length = 20;         string subject;           public override void SetSubject(string subject) //상을 맺히는 기능         {             if (subject.Length > max_length)             {                 subject = subject.Substring(0, max_length);             }             this.subject = subject;         }                 public override void Change()//이미지를 바꾸는 기능         {             string image = subject.Replace(red_eye, normal_eye);             Picture = new Picture(subject, image);         }     } }

 

▶Camera.cs

namespace Builder {     class Camera     {         PictureBuilder[] builders = new PictureBuilder[2];         public Picture MyPicture         {             get;             private set;         }         public Camera()         {             builders[0] = new REPreventBuilder();             builders[1] = new SmoothBuilder();             MyPicture = Picture.EmptyPicture;         }         public void PressAShutter(string origin,bool night)         {             PictureBuilder pb = null;             if (night) //밤일 때             {                 pb = builders[0];             }             else//밤이 아닐 때             {                 pb = builders[1];             }               pb.SetSubject(origin); //상을 맺힌다.             pb.Change(); //이미지를 수정한다.             MyPicture = pb.Picture;         }     } }

  

▶Program.cs

using System; namespace Builder {     class Program     {         static void Main(string[] args)         {             Camera camera = new Camera();             camera.PressAShutter("길 마당 RedEyeSharpBody 집 산 ",true);             Console.WriteLine(camera.MyPicture.Image);             camera.PressAShutter("길 마당 RedEyeSharpBody 집 산",false);             Console.WriteLine(camera.MyPicture.Image);         }     } }

 

▶실행 결과

길 마당 NomalEyeSharpBody 길 마당 RedEyeSmoothBody 집 산