/**
* This returns the data_handler class name for the internal message type set.
* Note: this also verifies that the data handler class exists. If it doesn't then $_valid is set to false
* and the data_handler_class name is set to an empty string.
*
* @param bool $preview Used to indicate that the preview data handler is to be returned.
* @return string
*/
public function get_data_handler_class_name($preview = false)
{
if ($this->_data_handler_class_name === '' && $this->valid()) {
$ref = $preview ? 'Preview' : $this->_message_type->get_data_handler($this->_data);
//make sure internal data is updated.
$this->_data = $this->_message_type->get_data();
//verify
$this->_data_handler_class_name = EE_Message_To_Generate::verify_and_retrieve_class_name_for_data_handler_reference($ref);
if ($this->_data_handler_class_name === '') {
$this->_valid = false;
}
}
return $this->_data_handler_class_name;
}
