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- #region Apache License
- //
- // Licensed to the Apache Software Foundation (ASF) under one or more
- // contributor license agreements. See the NOTICE file distributed with
- // this work for additional information regarding copyright ownership.
- // The ASF licenses this file to you 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
- // .NET Compact Framework 1.0 has no support for Environment.GetEnvironmentVariable()
- #if !NETCF
- using System;
- using System.Text;
- using System.IO;
- using log4net.Util;
- using log4net.DateFormatter;
- using log4net.Core;
- namespace log4net.Util.PatternStringConverters
- {
- /// <summary>
- /// Write an environment variable to the output
- /// </summary>
- /// <remarks>
- /// <para>
- /// Write an environment variable to the output writer.
- /// The value of the <see cref="log4net.Util.PatternConverter.Option"/> determines
- /// the name of the variable to output.
- /// </para>
- /// </remarks>
- /// <author>Nicko Cadell</author>
- internal sealed class EnvironmentPatternConverter : PatternConverter
- {
- /// <summary>
- /// Write an environment variable to the output
- /// </summary>
- /// <param name="writer">the writer to write to</param>
- /// <param name="state">null, state is not set</param>
- /// <remarks>
- /// <para>
- /// Writes the environment variable to the output <paramref name="writer"/>.
- /// The name of the environment variable to output must be set
- /// using the <see cref="log4net.Util.PatternConverter.Option"/>
- /// property.
- /// </para>
- /// </remarks>
- override protected void Convert(TextWriter writer, object state)
- {
- try
- {
- if (this.Option != null && this.Option.Length > 0)
- {
- // Lookup the environment variable
- string envValue = Environment.GetEnvironmentVariable(this.Option);
- #if NET_2_0
- // If we didn't see it for the process, try a user level variable.
- if (envValue == null)
- {
- envValue = Environment.GetEnvironmentVariable(this.Option, EnvironmentVariableTarget.User);
- }
- // If we still didn't find it, try a system level one.
- if (envValue == null)
- {
- envValue = Environment.GetEnvironmentVariable(this.Option, EnvironmentVariableTarget.Machine);
- }
- #endif
- if (envValue != null && envValue.Length > 0)
- {
- writer.Write(envValue);
- }
- }
- }
- catch(System.Security.SecurityException secEx)
- {
- // This security exception will occur if the caller does not have
- // unrestricted environment permission. If this occurs the expansion
- // will be skipped with the following warning message.
- LogLog.Debug(declaringType, "Security exception while trying to expand environment variables. Error Ignored. No Expansion.", secEx);
- }
- catch (Exception ex)
- {
- LogLog.Error(declaringType, "Error occurred while converting environment variable.", ex);
- }
- }
- #region Private Static Fields
- /// <summary>
- /// The fully qualified type of the EnvironmentPatternConverter class.
- /// </summary>
- /// <remarks>
- /// Used by the internal logger to record the Type of the
- /// log message.
- /// </remarks>
- private readonly static Type declaringType = typeof(EnvironmentPatternConverter);
- #endregion Private Static Fields
- }
- }
- #endif // !NETCF
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