//------------------------------------------------------------------------------
// <copyright file="SmiSettersStream.cs" company="Microsoft">
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// </copyright>
// <owner current="true" primary="true">Microsoft</owner>
// <owner current="true" primary="false">Microsoft</owner>
//------------------------------------------------------------------------------

namespace Microsoft.SqlServer.Server {
    using System;
    using System.Data.Common;
    using System.Data.SqlClient;
    using System.Diagnostics;
    using System.IO;

    internal class SmiSettersStream : Stream {

        private SmiEventSink_Default    _sink;
        private ITypedSettersV3         _setters;
        private int                     _ordinal;
        private long                    _lengthWritten;
        private SmiMetaData             _metaData;

        internal SmiSettersStream( SmiEventSink_Default sink, ITypedSettersV3 setters, int ordinal, SmiMetaData metaData ) {
            Debug.Assert( null != sink );
            Debug.Assert( null != setters );
            Debug.Assert( 0 <= ordinal );
            Debug.Assert( null != metaData );

            _sink = sink;
            _setters = setters;
            _ordinal = ordinal;
            _lengthWritten = 0;
            _metaData = metaData;
        }

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

        // If CanSeek is false, Position, Seek, Length, and SetLength should throw.
        public override bool CanSeek {
            get {
                return false;
            }
        }

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

        public override long Length {
            get {
                return _lengthWritten;
            }
        }

        public override long Position {
            get {
                return _lengthWritten;
            }
            set {
                throw SQL.StreamSeekNotSupported();
            }
        }

        public override void Flush() {
            _lengthWritten = ValueUtilsSmi.SetBytesLength(_sink, _setters, _ordinal, _metaData, _lengthWritten);
        }

        public override long Seek(long offset, SeekOrigin origin) {
            throw SQL.StreamSeekNotSupported();
        }

        public override void SetLength(long value) {
            if ( value < 0 ) {
                throw ADP.ArgumentOutOfRange("value");
            }
            ValueUtilsSmi.SetBytesLength(_sink, _setters, _ordinal, _metaData, value);
        }

        public override int Read(byte[] buffer, int offset, int count) {
            throw SQL.StreamReadNotSupported();
        }

        public override void Write(byte[] buffer, int offset, int count) {
            _lengthWritten += ValueUtilsSmi.SetBytes(_sink, _setters, _ordinal, _metaData, _lengthWritten, buffer, offset, count);
        }
    }
}