log4net/Util/PatternStringConverters/UserNamePatternConverter.cs

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#region Copyright & License
//
// Copyright 2001-2005 The Apache Software Foundation
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
#endregion

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

using log4net.Util;

namespace log4net.Util.PatternStringConverters
{
	/// <summary>
	/// Write the current threads username to the output
	/// </summary>
	/// <remarks>
	/// <para>
	/// Write the current threads username to the output writer
	/// </para>
	/// </remarks>
	/// <author>Nicko Cadell</author>
	internal sealed class UserNamePatternConverter : PatternConverter 
	{
		/// <summary>
		/// Write the current threads username to the output
		/// </summary>
		/// <param name="writer">the writer to write to</param>
		/// <param name="state">null, state is not set</param>
		/// <remarks>
		/// <para>
		/// Write the current threads username to the output <paramref name="writer"/>.
		/// </para>
		/// </remarks>
		override protected void Convert(TextWriter writer, object state) 
		{
#if (NETCF || SSCLI)
			// On compact framework there's no notion of current Windows user
			writer.Write( SystemInfo.NotAvailableText );
#else
			try
			{
				System.Security.Principal.WindowsIdentity windowsIdentity = null;
				windowsIdentity = System.Security.Principal.WindowsIdentity.GetCurrent();
				if (windowsIdentity != null && windowsIdentity.Name != null)
				{
					writer.Write( windowsIdentity.Name );