RSCG – ShadowWriterNullobjects

RSCG – ShadowWriterNullobjects
 
 

Generate null object for an class that implements an interface

This is how you can use ShadowWriterNullobjects .

The code that you start with is

<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>net9.0</TargetFramework>
    <ImplicitUsings>enable</ImplicitUsings>
    <Nullable>enable</Nullable>
  </PropertyGroup>

	<PropertyGroup>
		<EmitCompilerGeneratedFiles>true</EmitCompilerGeneratedFiles>
		<CompilerGeneratedFilesOutputPath>$(BaseIntermediateOutputPath)\GX</CompilerGeneratedFilesOutputPath>
	</PropertyGroup>

	<ItemGroup>
	  <PackageReference Include="ShadowWriter" Version="0.9.8">
	    <PrivateAssets>all</PrivateAssets>
	    <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
	  </PackageReference>
	</ItemGroup>

	</Project>

The code that you will use is

using NullInterface;

Console.WriteLine("Hello, World!");

Console.WriteLine("Hello, World!");
Department department = Department.Instance;
department.Name = "IT";
IEmployee employee = Employee.Instance;
employee.FirstName = "Andrei";
//employee.Department = department;
Console.WriteLine(employee.FirstName);
Console.WriteLine(employee.Department.Name);
Console.WriteLine(employee.GetFullNameAndDepartment(" - "));

namespace NullInterface;

[ShadowWriter.NullObject]
public partial class Department : IDepartment
{
}

public interface IDepartment
{
    public string Name { get; set; }
}

namespace NullInterface;


[ShadowWriter.NullObject]
public partial class Employee: IEmployee
{
    public IDepartment Department { get; set; } = NullInterface.Department.Instance;
}

public interface IEmployee
{
    public string FirstName { get; set; } 
    public string LastName { get; set; }
    public IDepartment Department { get; set; }
    public string GetFullName();
    public string GetFullNameAndDepartment(string separator);

}

The code that is generated is

// <auto-generated/>

using System;
using System.CodeDom.Compiler;
using System.Runtime.CompilerServices;

namespace ShadowWriter
{
    [CompilerGenerated]
    [GeneratedCode("ShadowWriter", "0.9.8.0")]
    [System.AttributeUsage(AttributeTargets.Class)]
    internal sealed class BuilderAttribute : System.Attribute
    {

    }
}

using System;
using System.Linq;
using System.CodeDom.Compiler;
using System.Runtime.CompilerServices;
using System.Threading.Tasks;

// Generated by GenerateNullObjectInPartialClass

#nullable enable

namespace NullInterface;

[CompilerGenerated]
[GeneratedCode("ShadowWriter", "0.9.8.0")]
public sealed partial class Department
{
  private Department()
  {}

  public static NullInterface.Department Instance { get; } = new Department();

  public string Name
  {
  get => string.Empty;
  set => _ = value;
  }
}

using System;
using System.Linq;
using System.CodeDom.Compiler;
using System.Runtime.CompilerServices;
using System.Threading.Tasks;

// Generated by GenerateNullObjectInPartialClass

#nullable enable

namespace NullInterface;

[CompilerGenerated]
[GeneratedCode("ShadowWriter", "0.9.8.0")]
public sealed partial class Employee
{
  private Employee()
  {}

  public static NullInterface.Employee Instance { get; } = new Employee();

  public string FirstName
  {
  get => string.Empty;
  set => _ = value;
  }
  public string LastName
  {
  get => string.Empty;
  set => _ = value;
  }
  // GetFullName
  public string GetFullName()
  {
     return string.Empty;
  }
  // GetFullNameAndDepartment
  public string GetFullNameAndDepartment(string separator)
  {
     return string.Empty;
  }
}

// <auto-generated/>

using System;
using System.CodeDom.Compiler;
using System.Runtime.CompilerServices;

namespace ShadowWriter
{
    [CompilerGenerated]
    [GeneratedCode("ShadowWriter", "0.9.8.0")]
    [System.AttributeUsage(AttributeTargets.Interface | AttributeTargets.Class)]
    internal sealed class NullObjectAttribute : System.Attribute
    {

    }

    [CompilerGenerated]
    [GeneratedCode("ShadowWriter", "0.9.8.0")]
    [System.AttributeUsage(System.AttributeTargets.Interface)]
    internal sealed class ClassNameAttribute : System.Attribute
    {
        public string Name { get; }

        public ClassNameAttribute(string name)
        {
            this.Name = name;
        }

        public ClassNameAttribute()
        {
            this.Name = string.Empty;
        }
    }
}

using System;
using System.CodeDom.Compiler;
using System.Runtime.CompilerServices;

namespace ShadowWriter;

[CompilerGenerated]
[GeneratedCode("ShadowWriter", "0.9.8.0")]
internal static class TheProject
{
  public static string FullPath => @"D:\gth\RSCG_Examples\v2\rscg_examples\ShadowWriterNullobjects\src\NullInterface\NullInterface.csproj";
  public static string ProjectDirectory => @"D:\gth\RSCG_Examples\v2\rscg_examples\ShadowWriterNullobjects\src\NullInterface";
  public static string Name => @"NullInterface";
  public static string OutDir => @"C:\Program Files\Microsoft Visual Studio\2022\Community\MSBuild\Current\Bin\Roslyn\bin\Debug\net9.0\";
  public static string Version => @"1.0.0";
  public static string RootNamespace => @"NullInterface";
  public static DateTimeOffset BuildTimeUtc => new DateTimeOffset(638918269412724408, TimeSpan.Zero);
}

Code and pdf at

https://ignatandrei.github.io/RSCG_Examples/v2/docs/ShadowWriterNullobjects