#region Copyright notice and license

// Copyright 2016, Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
//     * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

#endregion

using System;

namespace Grpc.Core.Logging
{
    /// <summary>
    /// Logger which doesn't log any information anywhere.
    /// </summary>
    public sealed class NullLogger : ILogger
    {
        /// <summary>
        /// As with all logging calls on this logger, this method is a no-op.
        /// </summary>
        public void Debug(string message)
        {
        }

        /// <summary>
        /// As with all logging calls on this logger, this method is a no-op.
        /// </summary>
        public void Debug(string format, params object[] formatArgs)
        {
        }

        /// <summary>
        /// As with all logging calls on this logger, this method is a no-op.
        /// </summary>
        public void Error(string message)
        {
        }

        /// <summary>
        /// As with all logging calls on this logger, this method is a no-op.
        /// </summary>
        public void Error(Exception exception, string message)
        {
        }

        /// <summary>
        /// As with all logging calls on this logger, this method is a no-op.
        /// </summary>
        public void Error(string format, params object[] formatArgs)
        {
        }

        /// <summary>
        /// Returns a reference to the instance on which the method is called, as
        /// instances aren't associated with specific types.
        /// </summary>
        public ILogger ForType<T>()
        {
            return this;
        }

        /// <summary>
        /// As with all logging calls on this logger, this method is a no-op.
        /// </summary>
        public void Info(string message)
        {
        }

        /// <summary>
        /// As with all logging calls on this logger, this method is a no-op.
        /// </summary>
        public void Info(string format, params object[] formatArgs)
        {
        }

        /// <summary>
        /// As with all logging calls on this logger, this method is a no-op.
        /// </summary>
        public void Warning(string message)
        {
        }

        /// <summary>
        /// As with all logging calls on this logger, this method is a no-op.
        /// </summary>
        public void Warning(Exception exception, string message)
        {
        }

        /// <summary>
        /// As with all logging calls on this logger, this method is a no-op.
        /// </summary>
        public void Warning(string format, params object[] formatArgs)
        {
        }
    }
}
