Cascade XSL

using System;
using System.IO;

namespace CXSL
{
	
	/// cxslFilter is a responce filter, 
	/// used to cache the output stream into a temporary memory.
	/// it doesn't fordward the output to the client.
	public class cxslFilter : Stream	
	{
		public Stream _sink;
		private long _position;
		private string _outstr; 

		 
		/// Construction. 
		/// sink is the previous filter
		public cxslFilter(Stream sink)
		{
			_sink = sink;
			_outstr = "";
		}

		// member of Stream must be overriden.
		public override bool CanRead
		{
			get { return true; }
		}

		// member of Stream must be overriden.
		public override bool CanSeek
		{
			get { return true; }
		}

		// member of Stream must be overriden.
		public override bool CanWrite
		{
			get { return true; }
		}

		// member of Stream must be overriden.
		public override long Length
		{
			get { return 0; }
		}

		// member of Stream must be overriden.
		public override long Position
		{
			get { return _position; }
			set { _position = value; }
		}

		// member of Stream must be overriden.
		public override long Seek(long offset, System.IO.SeekOrigin direction)
		{
			return _sink.Seek(offset, direction);
		}

		// member of Stream must be overriden.
		public override void SetLength(long length)
		{
			_sink.SetLength(length);
		}

		// member of Stream must be overriden.
		public override void Close()
		{
			_sink.Close();
		}

		// member of Stream must be overriden.
		public override void Flush()
		{
			_sink.Flush();
		}

		// member of Stream must be overriden.
		public override int Read(byte[] buffer, int offset, int count)
		{
			return _sink.Read(buffer, offset, count);
		}

		// member of Stream must be overriden.
		public String GetBuffer()
		{
			return _outstr;
		}

	
		/// The Write method does the caching.
		public override void Write(byte[] buffer, int offset, int count)
		{	
			// cache the output into _outstr 
			System.Text.Encoding Enc=System.Text.Encoding.Default;
			_outstr += Enc.GetString(buffer,offset,count);

			// we DO NOT fordward the output to the previous filter
			//_sink.Write(data, 0, count);
		}

	}
}