/**
* Constructor.
*
* @param Horde_Kolab_Format $handler The handler to be decorated.
* @param Horde_Support_Timer $timer The timer.
* @param mixed $logger The optional logger. If set this
* needs to provide a debug() method.
*/
public function __construct(Horde_Kolab_Format $handler, Horde_Support_Timer $timer, $logger = null)
{
parent::__construct($handler);
$this->_timer = $timer;
$this->_logger = $logger;
}