protected override void FormatXml()

in src/log4net/Layout/XmlLayoutSchemaLog4j.cs [139:277]
106 lines of code
20 McCabe index (conditional complexity)

		protected override void FormatXml(XmlWriter writer, LoggingEvent loggingEvent)
		{
			// Translate logging events for log4j

			// Translate hostname property
			if (loggingEvent.LookupProperty(LoggingEvent.HostNameProperty) != null && 
				loggingEvent.LookupProperty("log4jmachinename") == null)
			{
				loggingEvent.GetProperties()["log4jmachinename"] = loggingEvent.LookupProperty(LoggingEvent.HostNameProperty);
			}

			// translate appdomain name
			if (loggingEvent.LookupProperty("log4japp") == null && 
				loggingEvent.Domain != null && 
				loggingEvent.Domain.Length > 0)
			{
				loggingEvent.GetProperties()["log4japp"] = loggingEvent.Domain;
			}

			// translate identity name
			if (loggingEvent.Identity != null && 
				loggingEvent.Identity.Length > 0 && 
				loggingEvent.LookupProperty(LoggingEvent.IdentityProperty) == null)
			{
				loggingEvent.GetProperties()[LoggingEvent.IdentityProperty] = loggingEvent.Identity;
			}

			// translate user name
			if (loggingEvent.UserName != null && 
				loggingEvent.UserName.Length > 0 && 
				loggingEvent.LookupProperty(LoggingEvent.UserNameProperty) == null)
			{
				loggingEvent.GetProperties()[LoggingEvent.UserNameProperty] = loggingEvent.UserName;
			}

			// Write the start element
			#if NETSTANDARD
			writer.WriteStartElement("log4j", "event", "log4net");
			#else
			writer.WriteStartElement("log4j:event");
			#endif
			writer.WriteAttributeString("logger", loggingEvent.LoggerName);

			// Calculate the timestamp as the number of milliseconds since january 1970
			// 
			// We must convert the TimeStamp to UTC before performing any mathematical
			// operations. This allows use to take into account discontinuities
			// caused by daylight savings time transitions.
			TimeSpan timeSince1970 = loggingEvent.TimeStampUtc - s_date1970;

			writer.WriteAttributeString("timestamp", XmlConvert.ToString((long)timeSince1970.TotalMilliseconds));
			writer.WriteAttributeString("level", loggingEvent.Level.DisplayName);
			writer.WriteAttributeString("thread", loggingEvent.ThreadName);
    
			// Append the message text
			#if NETSTANDARD
			writer.WriteStartElement("log4j", "message", "log4net");
			#else
			writer.WriteStartElement("log4j:message");
			#endif
			Transform.WriteEscapedXmlString(writer, loggingEvent.RenderedMessage,this.InvalidCharReplacement);
			writer.WriteEndElement();

			object ndcObj = loggingEvent.LookupProperty("NDC");
			if (ndcObj != null)
			{
				string valueStr = loggingEvent.Repository.RendererMap.FindAndRender(ndcObj);

				if (valueStr != null && valueStr.Length > 0)
				{
					// Append the NDC text
					#if NETSTANDARD
					writer.WriteStartElement("log4j", "NDC", "log4net");
					#else
					writer.WriteStartElement("log4j:NDC");
					#endif
					Transform.WriteEscapedXmlString(writer, valueStr,this.InvalidCharReplacement);
					writer.WriteEndElement();
				}
			}

			// Append the properties text
			PropertiesDictionary properties = loggingEvent.GetProperties();
			if (properties.Count > 0)
			{
				#if NETSTANDARD
				writer.WriteStartElement("log4j", "properties", "log4net");
				#else
				writer.WriteStartElement("log4j:properties");
				#endif
				foreach(System.Collections.DictionaryEntry entry in properties)
				{
					#if NETSTANDARD
					writer.WriteStartElement("log4j", "data", "log4net");
					#else
					writer.WriteStartElement("log4j:data");
					#endif
					writer.WriteAttributeString("name", (string)entry.Key);

					// Use an ObjectRenderer to convert the object to a string
					string valueStr = loggingEvent.Repository.RendererMap.FindAndRender(entry.Value);
					writer.WriteAttributeString("value", valueStr);

					writer.WriteEndElement();
				}
				writer.WriteEndElement();
			}

			string exceptionStr = loggingEvent.GetExceptionString();
			if (exceptionStr != null && exceptionStr.Length > 0)
			{
				// Append the stack trace line
				#if NETSTANDARD
				writer.WriteStartElement("log4j", "throwable", "log4net");
				#else
				writer.WriteStartElement("log4j:throwable");
				#endif
				Transform.WriteEscapedXmlString(writer, exceptionStr,this.InvalidCharReplacement);
				writer.WriteEndElement();
			}

			if (LocationInfo)
			{ 
				LocationInfo locationInfo = loggingEvent.LocationInformation;

				#if NETSTANDARD
				writer.WriteStartElement("log4j", "locationInfo", "log4net");
				#else
				writer.WriteStartElement("log4j:locationInfo");
				#endif
				writer.WriteAttributeString("class", locationInfo.ClassName);
				writer.WriteAttributeString("method", locationInfo.MethodName);
				writer.WriteAttributeString("file", locationInfo.FileName);
				writer.WriteAttributeString("line", locationInfo.LineNumber);
				writer.WriteEndElement();
			}

			writer.WriteEndElement();
		}