#region Apache License
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//
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// Licensed to the Apache Software Foundation (ASF) under one or more
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// contributor license agreements. See the NOTICE file distributed with
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// this work for additional information regarding copyright ownership.
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// The ASF licenses this file to you under the Apache License, Version 2.0
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// (the "License"); you may not use this file except in compliance with
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// the License. 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 NET_2_0
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// If we didn't see it for the process, try a user level variable.
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if (envValue == null)
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{
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envValue = Environment.GetEnvironmentVariable(this.Option, EnvironmentVariableTarget.User);
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}
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// If we still didn't find it, try a system level one.
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if (envValue == null)
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{
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envValue = Environment.GetEnvironmentVariable(this.Option, EnvironmentVariableTarget.Machine);
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}
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#endif
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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(declaringType, "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(declaringType, "Error occurred while converting environment variable.", ex);
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}
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}
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#region Private Static Fields
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/// <summary>
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/// The fully qualified type of the EnvironmentPatternConverter class.
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/// </summary>
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/// <remarks>
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/// Used by the internal logger to record the Type of the
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/// log message.
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/// </remarks>
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private readonly static Type declaringType = typeof(EnvironmentPatternConverter);
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#endregion Private Static Fields
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}
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}
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#endif // !NETCF
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