org.apache.log4j.xml

Class XMLLayout

java.lang.Object

org.apache.log4j.Layout

org.apache.log4j.xml.XMLLayout

All Implemented Interfaces:

OptionHandler

public class XMLLayout
extends Layout

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.

Since:

0.9.0

Author:

Ceki Gülcü

Field Summary

Fields inherited from class org.apache.log4j.Layout

LINE_SEP, LINE_SEP_LEN

Constructor Summary

Constructors

Constructor and Description
XMLLayout()

Method Summary

Methods

Modifier and Type	Method and Description
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.

Methods inherited from class org.apache.log4j.Layout

getContentType, getFooter, getHeader

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

XMLLayout

public XMLLayout()

Method Detail

setLocationInfo

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.

getLocationInfo

public boolean getLocationInfo()

Returns the current value of the LocationInfo option.

setProperties

public void setProperties(boolean flag)

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

Parameters:

flag - new value.

Since:

1.2.15

getProperties

public boolean getProperties()

Gets whether MDC key-value pairs should be output.

Returns:

true if MDC key-value pairs are output.

Since:

1.2.15

activateOptions

public void activateOptions()

No options to activate.

format

public String format(LoggingEvent event)

Formats a LoggingEvent in conformance with the log4j.dtd.

Specified by:

format in class Layout

ignoresThrowable

public boolean ignoresThrowable()

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

Specified by:

ignoresThrowable in class Layout