public class

XMLLayout

extends Layout
java.lang.Object
   ↳ org.apache.log4j.Layout
     ↳ org.apache.log4j.xml.XMLLayout

Class Overview

The output of the XMLLayout consists of a series of log4j:event elements as defined in the log4j.dtd. It does not output a complete well-formed XML file. The output is designed to be included as an external entity in a separate file to form a correct XML file.

For example, if abc is the name of the file where the XMLLayout ouput goes, then a well-formed XML file would be:

   <?xml version="1.0" ?>

  <!DOCTYPE log4j:eventSet PUBLIC "-//APACHE//DTD LOG4J 1.2//EN" "log4j.dtd" [<!ENTITY data SYSTEM "abc">]>

  <log4j:eventSet version="1.2" xmlns:log4j="http://jakarta.apache.org/log4j/">
          &data;
  </log4j:eventSet>
  

This approach enforces the independence of the XMLLayout and the appender where it is embedded.

The version attribute helps components to correctly intrepret output generated by XMLLayout. The value of this attribute should be "1.1" for output generated by log4j versions prior to log4j 1.2 (final release) and "1.2" for relase 1.2 and later. Appenders using this layout should have their encoding set to UTF-8 or UTF-16, otherwise events containing non ASCII characters could result in corrupted log files.

Summary

[Expand]
Inherited Fields
From class org.apache.log4j.Layout
Public Constructors
XMLLayout()
Public Methods
void activateOptions()
No options to activate.
String format(LoggingEvent event)
Formats a LoggingEvent in conformance with the log4j.dtd.
boolean getLocationInfo()
Returns the current value of the LocationInfo option.
boolean getProperties()
Gets whether MDC key-value pairs should be output.
boolean ignoresThrowable()
The XMLLayout prints and does not ignore exceptions.
void setLocationInfo(boolean flag)
The LocationInfo option takes a boolean value.
void setProperties(boolean flag)
Sets whether MDC key-value pairs should be output, default false.
[Expand]
Inherited Methods
From class org.apache.log4j.Layout
From class java.lang.Object
From interface org.apache.log4j.spi.OptionHandler

Public Constructors

public XMLLayout ()

Public Methods

public void activateOptions ()

No options to activate.

public String format (LoggingEvent event)

Formats a LoggingEvent in conformance with the log4j.dtd.

public boolean getLocationInfo ()

Returns the current value of the LocationInfo option.

public boolean getProperties ()

Gets whether MDC key-value pairs should be output.

Returns
  • true if MDC key-value pairs are output.

public boolean ignoresThrowable ()

The XMLLayout prints and does not ignore exceptions. Hence the return value false.

public void setLocationInfo (boolean flag)

The LocationInfo option takes a boolean value. By default, it is set to false which means there will be no location information output by this layout. If the the option is set to true, then the file name and line number of the statement at the origin of the log statement will be output.

If you are embedding this layout within an SMTPAppender then make sure to set the LocationInfo option of that appender as well.

public void setProperties (boolean flag)

Sets whether MDC key-value pairs should be output, default false.

Parameters
flag new value.