protected override void Convert()

in src/log4net/Util/PatternStringConverters/EnvironmentPatternConverter.cs [54:94]

32 lines of code
10 McCabe index (conditional complexity)


		protected override 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 || NETSTANDARD2_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);
			}
		}