setPartClass example

/** * @see Zend_Mail_Exception */
                throw new Zend_Mail_Exception('need a message id with a handler');
            }

            $this->_mail       = $params['handler'];
            $this->_messageNum = $params['id'];
        }
        
        if (isset($params['partclass'])) {
            $this->setPartClass($params['partclass']);
        }

        if (isset($params['raw'])) {
            Zend_Mime_Decode::splitMessage($params['raw'], $this->_headers, $this->_content);
        } else if (isset($params['headers'])) {
            if (is_array($params['headers'])) {
                $this->_headers = $params['headers'];
            } else {
                if (!empty($params['noToplines'])) {
                    Zend_Mime_Decode::splitMessage($params['headers'], $this->_headers, $null);
                } else {