/**
* returns the existing Logger instance or instantiates a new one
*
* @access public
* @author Joel Bout, <*****@*****.**>
* @return common_Logger
*/
public static function singleton()
{
$returnValue = null;
if (is_null(self::$instance)) {
self::$instance = new self();
}
$returnValue = self::$instance;
return $returnValue;
}
