visitor pattern

DesignPattern/DesignPattern.sln

@@ -1,7 +1,7 @@
 
 Microsoft Visual Studio Solution File, Format Version 12.00
-# Visual Studio Version 17
-VisualStudioVersion = 17.3.32811.315
+# Visual Studio Version 16
+VisualStudioVersion = 16.0.32630.194
 MinimumVisualStudioVersion = 10.0.40219.1
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Singleton", "Singleton\Singleton.csproj", "{37FE4D0C-A213-4EA5-B3EF-DB2DB3971ACE}"
 EndProject
@@ -27,6 +27,8 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Proxy", "Proxy\Proxy.csproj
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Iterator", "Iterator\Iterator.csproj", "{FB64AA57-5E45-4DD9-B152-8548CFDD235F}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Visitor", "Visitor\Visitor.csproj", "{A34872B5-83A1-4C3C-B20C-24A46DA39E3F}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -81,6 +83,10 @@ Global
 		{FB64AA57-5E45-4DD9-B152-8548CFDD235F}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{FB64AA57-5E45-4DD9-B152-8548CFDD235F}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{FB64AA57-5E45-4DD9-B152-8548CFDD235F}.Release|Any CPU.Build.0 = Release|Any CPU
+		{A34872B5-83A1-4C3C-B20C-24A46DA39E3F}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{A34872B5-83A1-4C3C-B20C-24A46DA39E3F}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{A34872B5-83A1-4C3C-B20C-24A46DA39E3F}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{A34872B5-83A1-4C3C-B20C-24A46DA39E3F}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE

DesignPattern/Visitor/App.config

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<configuration>
+    <startup> 
+        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.8.1" />
+    </startup>
+</configuration>

DesignPattern/Visitor/Body.cs

@@ -0,0 +1,18 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Visitor
+{
+	class Body : ICarElement
+	{
+		public string Color => "Siver";
+
+		public void Accept(ICarVisitor visitor)
+		{
+			visitor.Visit(this);
+		}
+	}
+}

DesignPattern/Visitor/Car.cs

@@ -0,0 +1,34 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Visitor
+{
+	class Car : ICarElement
+	{
+		public string Maker => "BMW";
+		private List<ICarElement> elements;
+
+		public Car()
+		{
+			elements = new List<ICarElement>
+			{
+				new Engine(),
+				new Body(),
+				new Wheel()
+			};
+		}
+
+		public void Accept(ICarVisitor visitor)
+		{
+			foreach (ICarElement elem in elements)
+			{
+				elem.Accept(visitor);
+			}
+
+			visitor.Visit(this);
+		}
+	}
+}

DesignPattern/Visitor/CarPrintVisitor.cs

@@ -0,0 +1,31 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Visitor
+{
+	class CarPrintVisitor : ICarVisitor
+	{
+		public void Visit(Engine element)
+		{
+			Console.WriteLine(element.Spec);
+		}
+
+		public void Visit(Body element)
+		{
+			Console.WriteLine(element.Color);
+		}
+
+		public void Visit(Wheel element)
+		{
+			Console.WriteLine(element.Type);
+		}
+
+		public void Visit(Car element)
+		{
+			Console.WriteLine(element.Maker);
+		}
+	}
+}

DesignPattern/Visitor/Client.cs

@@ -0,0 +1,18 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Visitor
+{
+	class Client
+	{
+		public static void HowToTest()
+		{
+			ICarElement car = new Car();
+			ICarVisitor visitor = new CarPrintVisitor();
+			car.Accept(visitor);
+		}
+	}
+}

DesignPattern/Visitor/Engine.cs

@@ -0,0 +1,18 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Visitor
+{
+	class Engine : ICarElement
+	{
+		public string Spec => "V4";
+
+		public void Accept(ICarVisitor visitor)
+		{
+			visitor.Visit(this);
+		}
+	}
+}

DesignPattern/Visitor/ICarElement.cs

@@ -0,0 +1,13 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Visitor
+{
+	interface ICarElement
+	{
+		void Accept(ICarVisitor visitor);
+	}
+}

DesignPattern/Visitor/ICarVisitor.cs

@@ -0,0 +1,16 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Visitor
+{
+	interface ICarVisitor
+	{
+		void Visit(Engine element);
+		void Visit(Body element);
+		void Visit(Wheel elemetn);
+		void Visit(Car element);
+	}
+}

DesignPattern/Visitor/Program.cs

@@ -0,0 +1,23 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Visitor
+{
+	/*
+	 * 카테고리: 행위 패턴
+	 * 개요: 집합적 객체의 각 요소에 대해 새로운 동작을 추가하기 위해
+	 * 각 요소 클래스를 일일이 수정하지 않고 별도의 Visitor 클래스를 정의하여 새 동작을 추가함
+	 */
+	class Program
+	{
+		static void Main(string[] args)
+		{
+			Client.HowToTest();
+
+			Console.ReadKey();
+		}
+	}
+}

DesignPattern/Visitor/Properties/AssemblyInfo.cs

@@ -0,0 +1,36 @@
+using System.Reflection;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+
+// 어셈블리에 대한 일반 정보는 다음 특성 집합을 통해 
+// 제어됩니다. 어셈블리와 관련된 정보를 수정하려면
+// 이러한 특성 값을 변경하세요.
+[assembly: AssemblyTitle("Visitor")]
+[assembly: AssemblyDescription("")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("")]
+[assembly: AssemblyProduct("Visitor")]
+[assembly: AssemblyCopyright("Copyright ©  2022")]
+[assembly: AssemblyTrademark("")]
+[assembly: AssemblyCulture("")]
+
+// ComVisible을 false로 설정하면 이 어셈블리의 형식이 COM 구성 요소에 
+// 표시되지 않습니다. COM에서 이 어셈블리의 형식에 액세스하려면
+// 해당 형식에 대해 ComVisible 특성을 true로 설정하세요.
+[assembly: ComVisible(false)]
+
+// 이 프로젝트가 COM에 노출되는 경우 다음 GUID는 typelib의 ID를 나타냅니다.
+[assembly: Guid("a34872b5-83a1-4c3c-b20c-24a46da39e3f")]
+
+// 어셈블리의 버전 정보는 다음 네 가지 값으로 구성됩니다.
+//
+//      주 버전
+//      부 버전 
+//      빌드 번호
+//      수정 버전
+//
+// 모든 값을 지정하거나 아래와 같이 '*'를 사용하여 빌드 번호 및 수정 번호를
+// 기본값으로 할 수 있습니다.
+// [assembly: AssemblyVersion("1.0.*")]
+[assembly: AssemblyVersion("1.0.0.0")]
+[assembly: AssemblyFileVersion("1.0.0.0")]

DesignPattern/Visitor/Visitor.csproj

@@ -0,0 +1,61 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
+  <PropertyGroup>
+    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
+    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
+    <ProjectGuid>{A34872B5-83A1-4C3C-B20C-24A46DA39E3F}</ProjectGuid>
+    <OutputType>Exe</OutputType>
+    <RootNamespace>Visitor</RootNamespace>
+    <AssemblyName>Visitor</AssemblyName>
+    <TargetFrameworkVersion>v4.8.1</TargetFrameworkVersion>
+    <FileAlignment>512</FileAlignment>
+    <AutoGenerateBindingRedirects>true</AutoGenerateBindingRedirects>
+    <Deterministic>true</Deterministic>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
+    <PlatformTarget>AnyCPU</PlatformTarget>
+    <DebugSymbols>true</DebugSymbols>
+    <DebugType>full</DebugType>
+    <Optimize>false</Optimize>
+    <OutputPath>bin\Debug\</OutputPath>
+    <DefineConstants>DEBUG;TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
+    <PlatformTarget>AnyCPU</PlatformTarget>
+    <DebugType>pdbonly</DebugType>
+    <Optimize>true</Optimize>
+    <OutputPath>bin\Release\</OutputPath>
+    <DefineConstants>TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <ItemGroup>
+    <Reference Include="System" />
+    <Reference Include="System.Core" />
+    <Reference Include="System.Xml.Linq" />
+    <Reference Include="System.Data.DataSetExtensions" />
+    <Reference Include="Microsoft.CSharp" />
+    <Reference Include="System.Data" />
+    <Reference Include="System.Net.Http" />
+    <Reference Include="System.Xml" />
+  </ItemGroup>
+  <ItemGroup>
+    <Compile Include="Body.cs" />
+    <Compile Include="Car.cs" />
+    <Compile Include="CarPrintVisitor.cs" />
+    <Compile Include="Client.cs" />
+    <Compile Include="Engine.cs" />
+    <Compile Include="ICarElement.cs" />
+    <Compile Include="ICarVisitor.cs" />
+    <Compile Include="Program.cs" />
+    <Compile Include="Properties\AssemblyInfo.cs" />
+    <Compile Include="Wheel.cs" />
+  </ItemGroup>
+  <ItemGroup>
+    <None Include="App.config" />
+  </ItemGroup>
+  <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
+</Project>

DesignPattern/Visitor/Wheel.cs

@@ -0,0 +1,18 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Visitor
+{
+	class Wheel : ICarElement
+	{
+		public string Type => "P26";
+
+		public void Accept(ICarVisitor visitor)
+		{
+			visitor.Visit(this);
+		}
+	}
+}