OdbStreamWriter.cs

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// Copyright (c) 2014 Silicon Studio Corp. (http://siliconstudio.co.jp)
// This file is distributed under GPL v3. See LICENSE.md for details.
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace SiliconStudio.Core.Storage
{
    public abstract class OdbStreamWriter : Stream
    {
        protected readonly Stream stream;
        private readonly long initialPosition;

        public Action<OdbStreamWriter> Disposed;

        protected OdbStreamWriter(Stream stream, string temporaryName)
        {
            this.stream = stream;
            initialPosition = stream.Position;
            TemporaryName = temporaryName;
        }

        public string TemporaryName;

        public abstract ObjectId CurrentHash { get; }

        public override bool CanRead { get { return false; } }

        public override bool CanSeek { get { return true; } }

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

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

        protected override void Dispose(bool disposing)
        {
            // Force hash computation before stream is closed.
            var hash = CurrentHash;
            stream.Dispose();

            var disposed = Disposed;
            if (disposed != null)
                disposed(this);
        }

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

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

        public override int Read(byte[] buffer, int offset, int count)
        {
            throw new InvalidOperationException();
        }

        public override long Seek(long offset, SeekOrigin origin)
        {
            return stream.Seek(offset, origin);
        }

        public override void SetLength(long value)
        {
            throw new InvalidOperationException();
        }
    }
}