// Copyright (c) .NET Foundation. All rights reserved.
// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.

using System;
using Microsoft.Extensions.Logging;

namespace Microsoft.Net.Http.Server
{
    internal class NullLogger : ILogger
    {
        public static readonly NullLogger Instance = new NullLogger();

        public IDisposable BeginScope<TState>(TState state)
        {
            return NullDisposable.Instance;
        }

        public void Log<TState>(LogLevel logLevel, EventId eventId, TState state, Exception exception, Func<TState, Exception, string> formatter)
        {
        }

        public bool IsEnabled(LogLevel logLevel)
        {
            return false;
        }

        private class NullDisposable : IDisposable
        {
            public static readonly NullDisposable Instance = new NullDisposable();

            public void Dispose()
            {
                // intentionally does nothing
            }
        }
    }
}