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LogTextWriter.cs

//
// LogTextWriter.cs
//
// Author:
//   Lluis Sanchez Gual
//
// Copyright (C) 2007 Novell, Inc (http://www.novell.com)
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
// 
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//


using System;
using System.IO;
using System.Text;
using System.Collections;

namespace Mono.Addins.Setup.ProgressMonitoring
{
      internal delegate void LogTextEventHandler (string writtenText);
      
      internal class LogTextWriter: TextWriter
      {
            ArrayList chainedWriters;
            
            public void ChainWriter (TextWriter writer)
            {
                  if (chainedWriters == null) chainedWriters = new ArrayList ();
                  chainedWriters.Add (writer);
            }
            
            public void UnchainWriter (TextWriter writer)
            {
                  if (chainedWriters != null) {
                        chainedWriters.Remove (writer);
                        if (chainedWriters.Count == 0)
                              chainedWriters = null;
                  }
            }
            
            public override Encoding Encoding {
                  get { return Encoding.Default; }
            }
            
            public override void Close ()
            {
                  if (Closed != null)
                        Closed (this, null);
            }
            
            public override void Write (char value)
            {
                  if (TextWritten != null)
                        TextWritten (value.ToString ());
                  if (chainedWriters != null)
                        foreach (TextWriter cw in chainedWriters)
                              cw.Write (value);
            }
            
            public override void Write (string value)
            {
                  if (TextWritten != null)
                        TextWritten (value);
                  if (chainedWriters != null)
                        foreach (TextWriter cw in chainedWriters)
                              cw.Write (value);
            }
            
            public event LogTextEventHandler TextWritten;
            public event EventHandler Closed;
      }
}

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