Decorator Design Pattern

Use Coffee Shop to illustrate the decorator design pattern
hustwenchao · Mar 28, 2016 · bab6383 · bab6383
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diff --git a/Decorator/CoffeeShop/CoffeeShop.sln b/Decorator/CoffeeShop/CoffeeShop.sln
@@ -0,0 +1,22 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio 14
+VisualStudioVersion = 14.0.24720.0
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "CoffeeShop", "CoffeeShop\CoffeeShop.csproj", "{34D4C17D-6FCD-4B84-AA6D-C81E4CA2B591}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{34D4C17D-6FCD-4B84-AA6D-C81E4CA2B591}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{34D4C17D-6FCD-4B84-AA6D-C81E4CA2B591}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{34D4C17D-6FCD-4B84-AA6D-C81E4CA2B591}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{34D4C17D-6FCD-4B84-AA6D-C81E4CA2B591}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+EndGlobal
diff --git a/Decorator/CoffeeShop/CoffeeShop/App.config b/Decorator/CoffeeShop/CoffeeShop/App.config
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<configuration>
+    <startup> 
+        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5.2" />
+    </startup>
+</configuration>
diff --git a/Decorator/CoffeeShop/CoffeeShop/Beverage.cs b/Decorator/CoffeeShop/CoffeeShop/Beverage.cs
@@ -0,0 +1,20 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace CoffeeShop
+{
+    public abstract class Beverage
+    {
+        protected string description = "Unknown Beverage";
+
+        public string getDescription()
+        {
+            return description;
+        }
+
+        public abstract double cost();
+    }
+}
diff --git a/Decorator/CoffeeShop/CoffeeShop/Beverages/DarkRoast.cs b/Decorator/CoffeeShop/CoffeeShop/Beverages/DarkRoast.cs
@@ -0,0 +1,17 @@
+using System;
+
+namespace CoffeeShop.Beverages
+{
+    public class DarkRoast : Beverage
+    {
+        public DarkRoast()
+        {
+            description = "Dark Roast";
+        }
+
+        public override double cost()
+        {
+            return 0.89f;
+        }
+    }
+}
diff --git a/Decorator/CoffeeShop/CoffeeShop/Beverages/Espresso.cs b/Decorator/CoffeeShop/CoffeeShop/Beverages/Espresso.cs
@@ -0,0 +1,22 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace CoffeeShop.Beverages
+{
+    public class Espresso : Beverage
+    {
+        public Espresso()
+        {
+            description = "Espresso";
+        }
+
+        public override double cost()
+        {
+            return 1.99f;
+        }
+
+    }
+}
diff --git a/Decorator/CoffeeShop/CoffeeShop/Beverages/HouseBlend.cs b/Decorator/CoffeeShop/CoffeeShop/Beverages/HouseBlend.cs
@@ -0,0 +1,21 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace CoffeeShop.Beverages
+{
+    public class HouseBlend : Beverage
+    {
+        public HouseBlend()
+        {
+            description = "HouseBlend";
+        }
+
+        public override double cost()
+        {
+            return 0.89f;
+        }
+    }
+}
diff --git a/Decorator/CoffeeShop/CoffeeShop/CoffeeShop.csproj b/Decorator/CoffeeShop/CoffeeShop/CoffeeShop.csproj
@@ -0,0 +1,67 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="14.0" DefaultTargets="Build" 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>{34D4C17D-6FCD-4B84-AA6D-C81E4CA2B591}</ProjectGuid>
+    <OutputType>Exe</OutputType>
+    <AppDesignerFolder>Properties</AppDesignerFolder>
+    <RootNamespace>CoffeeShop</RootNamespace>
+    <AssemblyName>CoffeeShop</AssemblyName>
+    <TargetFrameworkVersion>v4.5.2</TargetFrameworkVersion>
+    <FileAlignment>512</FileAlignment>
+    <AutoGenerateBindingRedirects>true</AutoGenerateBindingRedirects>
+  </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="Beverage.cs" />
+    <Compile Include="Beverages\DarkRoast.cs" />
+    <Compile Include="Beverages\HouseBlend.cs" />
+    <Compile Include="Condiments\Mocha.cs" />
+    <Compile Include="CondimentDecorator.cs" />
+    <Compile Include="Beverages\Espresso.cs" />
+    <Compile Include="Program.cs" />
+    <Compile Include="Properties\AssemblyInfo.cs" />
+  </ItemGroup>
+  <ItemGroup>
+    <None Include="App.config" />
+  </ItemGroup>
+  <ItemGroup />
+  <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
+  <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 
+       Other similar extension points exist, see Microsoft.Common.targets.
+  <Target Name="BeforeBuild">
+  </Target>
+  <Target Name="AfterBuild">
+  </Target>
+  -->
+</Project>
diff --git a/Decorator/CoffeeShop/CoffeeShop/CondimentDecorator.cs b/Decorator/CoffeeShop/CoffeeShop/CondimentDecorator.cs
@@ -0,0 +1,16 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace CoffeeShop
+{
+    public class CondimentDecorator : Beverage
+    {
+        public override double cost()
+        {
+            return 0.00f;
+        }
+    }
+}
diff --git a/Decorator/CoffeeShop/CoffeeShop/Condiments/Mocha.cs b/Decorator/CoffeeShop/CoffeeShop/Condiments/Mocha.cs
@@ -0,0 +1,24 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace CoffeeShop.Condiments
+{
+    public class Mocha : Beverage
+    {
+        Beverage beverage;
+
+        public Mocha(Beverage beverage)
+        {
+            this.beverage = beverage;
+            description = "Mocha";
+        }
+
+        public override double cost()
+        {
+            return 0.20f + beverage.cost();
+        }
+    }
+}
diff --git a/Decorator/CoffeeShop/CoffeeShop/Program.cs b/Decorator/CoffeeShop/CoffeeShop/Program.cs
@@ -0,0 +1,24 @@
+using CoffeeShop.Beverages;
+using CoffeeShop.Condiments;
+using System;
+
+namespace CoffeeShop
+{
+    class Program
+    {
+        static void Main(string[] args)
+        {
+            Beverage beverage = new Espresso();
+            Console.WriteLine(beverage.getDescription()
+                + " $" + beverage.cost());
+
+            Beverage beverage2 = new DarkRoast();
+            beverage2 = new Mocha(beverage2);
+            beverage2 = new Mocha(beverage2);
+            Console.WriteLine(beverage2.getDescription()
+                + " $" + beverage2.cost());
+
+            Console.ReadLine();
+        }
+    }
+}
diff --git a/Decorator/CoffeeShop/CoffeeShop/Properties/AssemblyInfo.cs b/Decorator/CoffeeShop/CoffeeShop/Properties/AssemblyInfo.cs
@@ -0,0 +1,36 @@
+using System.Reflection;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+
+// 有关程序集的一般信息由以下
+// 控制。更改这些特性值可修改
+// 与程序集关联的信息。
+[assembly: AssemblyTitle("CoffeeShop")]
+[assembly: AssemblyDescription("")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("")]
+[assembly: AssemblyProduct("CoffeeShop")]
+[assembly: AssemblyCopyright("Copyright ©  2016")]
+[assembly: AssemblyTrademark("")]
+[assembly: AssemblyCulture("")]
+
+//将 ComVisible 设置为 false 将使此程序集中的类型
+//对 COM 组件不可见。  如果需要从 COM 访问此程序集中的类型，
+//请将此类型的 ComVisible 特性设置为 true。
+[assembly: ComVisible(false)]
+
+// 如果此项目向 COM 公开，则下列 GUID 用于类型库的 ID
+[assembly: Guid("34d4c17d-6fcd-4b84-aa6d-c81e4ca2b591")]
+
+// 程序集的版本信息由下列四个值组成: 
+//
+//      主版本
+//      次版本
+//      生成号
+//      修订号
+//
+//可以指定所有这些值，也可以使用“生成号”和“修订号”的默认值，
+// 方法是按如下所示使用“*”: :
+// [assembly: AssemblyVersion("1.0.*")]
+[assembly: AssemblyVersion("1.0.0.0")]
+[assembly: AssemblyFileVersion("1.0.0.0")]