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Viewing changes to src/core/Simias.log4net/src/Util/PatternStringConverters/.svn/text-base/EnvironmentPatternConverter.cs.svn-base

  • Committer: Jorge O. Castro
  • Date: 2007-12-03 06:56:46 UTC
  • Revision ID: jorge@ubuntu.com-20071203065646-mupcnjcwgm5mnhyt
* Remove a bunch of .svn directories we no longer need.

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src/core/Simias.log4net/src/Util/PatternStringConverters/.svn/text-base/EnvironmentPatternConverter.cs.svn-base
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#region Copyright & License
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//
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// Copyright 2001-2005 The Apache Software Foundation
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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#endregion
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// .NET Compact Framework 1.0 has no support for Environment.GetEnvironmentVariable()
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#if !NETCF
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using System;
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using System.Text;
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using System.IO;
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using log4net.Util;
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using log4net.DateFormatter;
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using log4net.Core;
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namespace log4net.Util.PatternStringConverters
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{
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        /// <summary>
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        /// Write an environment variable to the output
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        /// </summary>
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        /// <remarks>
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        /// <para>
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        /// Write an environment variable to the output writer.
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        /// The value of the <see cref="log4net.Util.PatternConverter.Option"/> determines 
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        /// the name of the variable to output.
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        /// </para>
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        /// </remarks>
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        /// <author>Nicko Cadell</author>
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        internal sealed class EnvironmentPatternConverter : PatternConverter
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        {
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                /// <summary>
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                /// Write an environment variable to the output
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                /// </summary>
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                /// <param name="writer">the writer to write to</param>
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                /// <param name="state">null, state is not set</param>
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                /// <remarks>
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                /// <para>
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                /// Writes the environment variable to the output <paramref name="writer"/>.
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                /// The name of the environment variable to output must be set
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                /// using the <see cref="log4net.Util.PatternConverter.Option"/>
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                /// property.
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                /// </para>
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                /// </remarks>
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                override protected void Convert(TextWriter writer, object state) 
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                {
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                        try 
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                        {
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                                if (this.Option != null && this.Option.Length > 0)
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                                {
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                                        // Lookup the environment variable
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                                        string envValue = Environment.GetEnvironmentVariable(this.Option);
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                                        if (envValue != null && envValue.Length > 0)
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                                        {
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                                                writer.Write(envValue);
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                                        }
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                                }
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                        }
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                        catch(System.Security.SecurityException secEx)
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                        {
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                                // This security exception will occur if the caller does not have 
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                                // unrestricted environment permission. If this occurs the expansion 
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                                // will be skipped with the following warning message.
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                                LogLog.Debug("EnvironmentPatternConverter: Security exception while trying to expand environment variables. Error Ignored. No Expansion.", secEx);
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                        }
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                        catch (Exception ex) 
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                        {
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                                LogLog.Error("EnvironmentPatternConverter: Error occurred while converting environment variable.", ex);
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                        }
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                }
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        }
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}
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#endif // !NETCF
 
 
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