// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
 
using System.IO;
using System.Threading;
using System.Threading.Tasks;
 
namespace System.ServiceModel.Channels
{
    // Base Stream that delegates all its methods to another Stream.
    public abstract class DelegatingStream : Stream
    {
        private Stream _stream;
        private bool _disposed;
 
        protected DelegatingStream(Stream stream)
        {
            if (stream == null)
            {
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("stream");
            }
 
            _stream = stream;
        }
 
        protected Stream BaseStream
        {
            get
            {
                return _stream;
            }
        }
 
        public override bool CanRead
        {
            get
            {
                return _stream.CanRead;
            }
        }
 
        public override bool CanSeek
        {
            get
            {
                return _stream.CanSeek;
            }
        }
 
        public override bool CanTimeout
        {
            get
            {
                return _stream.CanTimeout;
            }
        }
 
        public override bool CanWrite
        {
            get
            {
                return _stream.CanWrite;
            }
        }
 
        protected override void Dispose(bool disposing)
        {
            if (!_disposed)
            {
                if (disposing)
                {
                    _stream.Dispose();
                }
 
                _disposed = true;
            }
            base.Dispose(disposing);
        }
 
        public override long Length
        {
            get
            {
                return _stream.Length;
            }
        }
 
        public override long Position
        {
            get
            {
                return _stream.Position;
            }
            set
            {
                _stream.Position = value;
            }
        }
 
        public override int ReadTimeout
        {
            get
            {
                return _stream.ReadTimeout;
            }
            set
            {
                _stream.ReadTimeout = value;
            }
        }
 
        public override int WriteTimeout
        {
            get
            {
                return _stream.WriteTimeout;
            }
            set
            {
                _stream.WriteTimeout = value;
            }
        }
 
        public override Task CopyToAsync(Stream destination, int bufferSize, CancellationToken cancellationToken)
        {
            return _stream.CopyToAsync(destination, bufferSize, cancellationToken);
        }
 
        public override void Flush()
        {
            _stream.Flush();
        }
 
        public override Task FlushAsync(CancellationToken cancellationToken)
        {
            return _stream.FlushAsync(cancellationToken);
        }
 
 
        public override int Read(byte[] buffer, int offset, int count)
        {
            return _stream.Read(buffer, offset, count);
        }
 
        public override Task<int> ReadAsync(byte[] buffer, int offset, int count, CancellationToken cancellationToken)
        {
            return _stream.ReadAsync(buffer, offset, count, cancellationToken);
        }
 
        public override int ReadByte()
        {
            return _stream.ReadByte();
        }
 
        public override long Seek(long offset, SeekOrigin origin)
        {
            return _stream.Seek(offset, origin);
        }
 
        public override void SetLength(long value)
        {
            _stream.SetLength(value);
        }
 
        public override void Write(byte[] buffer, int offset, int count)
        {
            _stream.Write(buffer, offset, count);
        }
 
        public override Task WriteAsync(byte[] buffer, int offset, int count, CancellationToken cancellationToken)
        {
            return _stream.WriteAsync(buffer, offset, count, cancellationToken);
        }
 
        public override void WriteByte(byte value)
        {
            _stream.WriteByte(value);
        }
    }
}