using System;
using System.IO;

namespace Storage
{
    public class StreamWrapper: Stream
    {
        private readonly Stream stream;

        private readonly Action<StreamWrapper> onDispose;

        public StreamWrapper(Stream stream, Action<StreamWrapper> onDispose)
        {
            this.stream = stream; this.onDispose = onDispose;
        }

        protected override void Dispose(bool disposing)
        {
            base.Dispose(disposing); if (disposing && onDispose != null) onDispose(this);
        }

        public override bool CanRead { get { return stream.CanRead; } }

        public override bool CanSeek { get { return stream.CanSeek; } }

        public override bool CanWrite { get { return stream.CanWrite; } }

        public override void Flush() { stream.Flush(); }

        public override long Length { get { return stream.Length; } }

        public override long Position { get { return stream.Position; } set { stream.Position = value; } }

        public override int Read(byte[] buffer, int offset, int count) { return stream.Read(buffer, offset, count); }

        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); }
    }
}