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//------------------------------------------------------------------------------
// <copyright file="SqlClientWrapperSmiStream.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.Data.SqlTypes;
using System.Diagnostics;
using System.IO;
// Simple SqlStreamChars wrapper over SmiStream that handles server events on the
// SqlClient side of Smi
internal class SqlClientWrapperSmiStreamChars : SqlStreamChars {
private SmiEventSink_Default _sink;
private SmiStream _stream;
internal SqlClientWrapperSmiStreamChars( SmiEventSink_Default sink, SmiStream stream ) {
Debug.Assert( null != sink );
Debug.Assert( null != stream );
_sink = sink;
_stream = stream;
}
public override bool IsNull {
get {
return null == _stream;
}
}
public override bool CanRead {
get {
return _stream.CanRead;
}
}
// If CanSeek is false, Position, Seek, Length, and SetLength should throw.
public override bool CanSeek {
get {
return _stream.CanSeek;
}
}
public override bool CanWrite {
get {
return _stream.CanWrite;
}
}
public override long Length {
get {
long length = _stream.GetLength( _sink );
_sink.ProcessMessagesAndThrow();
if ( length > 0 )
return length / sizeof( char );
else
return length;
}
}
public override long Position {
get {
long position = _stream.GetPosition( _sink ) / sizeof( char );
_sink.ProcessMessagesAndThrow();
return position;
}
set {
if ( value < 0 ) {
throw ADP.ArgumentOutOfRange("Position");
}
_stream.SetPosition( _sink, value * sizeof( char ) );
_sink.ProcessMessagesAndThrow();
}
}
public override void Flush() {
_stream.Flush( _sink );
_sink.ProcessMessagesAndThrow();
}
public override long Seek(long offset, SeekOrigin origin) {
long result = _stream.Seek( _sink, offset * sizeof( char ), origin );
_sink.ProcessMessagesAndThrow();
return result;
}
public override void SetLength(long value) {
if ( value < 0 ) {
throw ADP.ArgumentOutOfRange("value");
}
_stream.SetLength( _sink, value * sizeof( char ) );
_sink.ProcessMessagesAndThrow();
}
public override int Read(char[] buffer, int offset, int count) {
int bytesRead = _stream.Read( _sink, buffer, offset * sizeof( char ), count );
_sink.ProcessMessagesAndThrow();
return bytesRead;
}
public override void Write(char[] buffer, int offset, int count) {
_stream.Write( _sink, buffer, offset, count );
_sink.ProcessMessagesAndThrow();
}
// Convenience methods to allow simple pulling/pushing of raw bytes
internal int Read(byte[] buffer, int offset, int count) {
int bytesRead = _stream.Read( _sink, buffer, offset, count );
_sink.ProcessMessagesAndThrow();
return bytesRead;
}
internal void Write(byte[] buffer, int offset, int count) {
_stream.Write( _sink, buffer, offset, count );
_sink.ProcessMessagesAndThrow();
}
}
}
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