// Copyright (c) Microsoft Open Technologies, Inc.
// All Rights Reserved
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// THIS CODE IS PROVIDED *AS IS* BASIS, WITHOUT WARRANTIES OR
// CONDITIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING
// WITHOUT LIMITATION ANY IMPLIED WARRANTIES OR CONDITIONS OF
// TITLE, FITNESS FOR A PARTICULAR PURPOSE, MERCHANTABLITY OR
// NON-INFRINGEMENT.
// See the Apache 2 License for the specific language governing
// permissions and limitations under the License.

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
            }
        }
    }
}