private static void InternalConfigure()

in src/log4net/Config/XmlConfigurator.cs [564:620]
43 lines of code
6 McCabe index (conditional complexity)

  private static void InternalConfigure(ILoggerRepository repository, Stream? configStream)
  {
    LogLog.Debug(_declaringType, $"configuring repository [{repository.Name}] using stream");

    if (configStream is null)
    {
      LogLog.Error(_declaringType, "Configure called with null 'configStream' parameter");
    }
    else
    {
      // Load the config file into a document
      XmlDocument? doc = new() { XmlResolver = null };
      try
      {
        // Allow the DTD to specify entity includes
        XmlReaderSettings settings = new()
        {
          // .NET 4.0 warning CS0618: 'System.Xml.XmlReaderSettings.ProhibitDtd'
          // is obsolete: 'Use XmlReaderSettings.DtdProcessing property instead.'
          DtdProcessing = DtdProcessing.Ignore
        };

        // Create a reader over the input stream
        using XmlReader xmlReader = XmlReader.Create(configStream, settings);

        // load the data into the document
        doc.Load(xmlReader);
      }
      catch (Exception e) when (!e.IsFatal())
      {
        LogLog.Error(_declaringType, "Error while loading XML configuration", e);

        // The document is invalid
        doc = null;
      }

      if (doc is not null)
      {
        LogLog.Debug(_declaringType, "loading XML configuration");

        // Configure using the 'log4net' element
        XmlNodeList configNodeList = doc.GetElementsByTagName("log4net");
        if (configNodeList.Count == 0)
        {
          LogLog.Debug(_declaringType, "XML configuration does not contain a <log4net> element. Configuration Aborted.");
        }
        else if (configNodeList.Count > 1)
        {
          LogLog.Error(_declaringType, $"XML configuration contains [{configNodeList.Count}] <log4net> elements. Only one is allowed. Configuration Aborted.");
        }
        else
        {
          InternalConfigureFromXml(repository, configNodeList[0] as XmlElement);
        }
      }
    }
  }