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   * Copyright 1999-2005 The Apache Software Foundation.
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
 // Contributors:   Mathias Bogaert
 package org.apache.log4j.xml;
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 SYSTEM "log4j.dtd" [<!ENTITY data SYSTEM "abc">]>
<log4j:eventSet version="1.2" xmlns:log4j="">

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.

Ceki Gülcü
 public class XMLLayout extends Layout {
   private  final int DEFAULT_SIZE = 256;
   private final int UPPER_LIMIT = 2048;
   private StringBuffer buf = new StringBuffer();
   private boolean locationInfo = false;
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 then make sure to set the LocationInfo option of that appender as well.

   public void setLocationInfo(boolean flag) {
      = flag;
Returns the current value of the LocationInfo option.
   public boolean getLocationInfo() {
     return ;
No options to activate.
   public void activateOptions() {

Formats a org.apache.log4j.spi.LoggingEvent in conformance with the log4j.dtd.
   public String format(LoggingEvent event) {
    // Reset working buffer. If the buffer is too large, then we need a new
    // one in order to avoid the penalty of creating a large array.
    if(.capacity() > ) {
       = new StringBuffer();
    } else {
    // We yield to the \r\n heresy.
    .append("<log4j:event logger=\"");
    .append("\" timestamp=\"");
    .append("\" level=\"");
    .append("\" thread=\"");
    // Append the rendered message. Also make sure to escape any
    // existing CDATA sections.
    String ndc = event.getNDC();
    if(ndc != null) {
    String[] s = event.getThrowableStrRep();
    if(s != null) {
      for(int i = 0; i < s.lengthi++) {
    if() { 
      LocationInfo locationInfo = event.getLocationInformation();	
      .append("<log4j:locationInfo class=\"");
      .append("\" method=\"");
      .append("\" file=\"");
      .append("\" line=\"");
    return .toString();
The XMLLayout prints and does not ignore exceptions. Hence the return value false.
  public boolean ignoresThrowable() {
    return false;
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