FileDiagnosticChannelFactory.cs

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using System;
using System.IO;
using System.Linq;
using System.Text;
 
using Microsoft.Extensions.DependencyInjection;
 
namespace IKVM.Tools.Core.Diagnostics
{
 
    class FileDiagnosticChannelFactory : IDiagnosticChannelFactory
    {
 
        public const string STDOUT = "stdout";
        public const string STDERR = "stderr";
 
        public static IServiceCollection Add(IServiceCollection services)
        {
            return services.AddSingleton<IDiagnosticChannelFactory, FileDiagnosticChannelFactory>();
        }
 
        public IDiagnosticChannel? CreateChannel(string spec)
        {
            if (spec is null)
                throw new ArgumentNullException(nameof(spec));
 
            return spec switch
            {
                "1" or STDOUT => new StreamDiagnosticChannel(Console.OpenStandardOutput(), Console.OutputEncoding, leaveOpen: false),
                "2" or STDERR => new StreamDiagnosticChannel(Console.OpenStandardError(), Console.OutputEncoding, leaveOpen: false),
                _ when spec.Contains(Path.DirectorySeparatorChar) => new StreamDiagnosticChannel(File.OpenWrite(spec), Encoding.UTF8, leaveOpen: false),
                _ => null,
            };
        }
 
    }
 
}