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//
// System.Data.SqlClient.SqlXmlTextReader.cs
//
// Author:
// Rodrigo Moya (rodrigo@ximian.com)
// Daniel Morgan (danmorg@sc.rr.com)
// Tim Coleman (tim@timcoleman.com)
//
// (C) Ximian, Inc 2002
// (C) Daniel Morgan 2002
// Copyright (C) Tim Coleman, 2002
//
using Mono.Data.Tds.Protocol;
using System;
using System.IO;
using System.Text;
namespace System.Data.SqlClient {
internal sealed class SqlXmlTextReader : TextReader, IDisposable
{
#region Fields
bool disposed = false;
bool eof = false;
SqlDataReader reader;
string localBuffer = "<results>";
int position;
#endregion // Fields
#region Constructors
internal SqlXmlTextReader (SqlDataReader reader)
: base ()
{
this.reader = reader;
}
#endregion
#region Methods
public override void Close()
{
reader.Close ();
}
protected override void Dispose (bool disposing)
{
if (!disposed) {
if (disposing) {
Close ();
((IDisposable) reader).Dispose ();
}
disposed = true;
}
}
void IDisposable.Dispose ()
{
Dispose (true);
GC.SuppressFinalize (this);
}
private bool GetNextBuffer ()
{
if (eof) {
localBuffer = null;
return false;
}
position = 0;
if (reader.Read ())
localBuffer = reader.GetString (0);
else if (reader.NextResult () && reader.Read ())
localBuffer = reader.GetString (0);
else {
eof = true;
localBuffer = "</results>";
}
return true;
}
public override int Peek ()
{
bool moreResults;
if (localBuffer == null || localBuffer.Length == 0) {
moreResults = GetNextBuffer ();
if (!moreResults)
return -1;
}
if (eof && position >= localBuffer.Length)
return -1;
return (int) localBuffer[position];
}
public override int Read ()
{
int result = Peek ();
position += 1;
if (!eof && position >= localBuffer.Length)
GetNextBuffer ();
return result;
}
public override int Read (char[] buffer, int index, int count)
{
bool moreResults = true;
int countRead = 0;
if (localBuffer == null)
moreResults = GetNextBuffer ();
while (moreResults && count - countRead > localBuffer.Length - position) {
localBuffer.CopyTo (position, buffer, index + countRead, localBuffer.Length);
countRead += localBuffer.Length;
moreResults = GetNextBuffer ();
}
if (moreResults && countRead < count) {
localBuffer.CopyTo (position, buffer, index + countRead, count - countRead);
position += count - countRead;
}
return countRead;
}
public override int ReadBlock (char[] buffer, int index, int count)
{
return Read (buffer, index, count);
}
public override string ReadLine ()
{
bool moreResults = true;
string outBuffer;
if (localBuffer == null)
moreResults = GetNextBuffer ();
if (!moreResults)
return null;
outBuffer = localBuffer;
GetNextBuffer ();
return outBuffer;
}
public override string ReadToEnd ()
{
string outBuffer = String.Empty;
bool moreResults = true;
if (localBuffer == null)
moreResults = GetNextBuffer ();
while (moreResults) {
outBuffer += localBuffer;
moreResults = GetNextBuffer ();
}
return outBuffer;
}
#endregion // Methods
}
}
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