public function output($line, $outcome, $status, $data) {
        global $OUTPUT;
        if ($this->outputmode == self::NO_OUTPUT) {
            return;
        }

        if ($this->outputmode == self::OUTPUT_PLAIN) {
            $message = array(
                $line,
                $outcome ? 'OK' : 'NOK',
                isset($data['id']) ? $data['id'] : '',
                isset($data['shortname']) ? $data['shortname'] : '',
                isset($data['fullname']) ? $data['fullname'] : '',
                isset($data['idnumber']) ? $data['idnumber'] : ''
            );
            $this->buffer->output(implode("\t", $message));
            if (!empty($status)) {
                foreach ($status as $st) {
                    $this->buffer->output($st, 1);
                }
            }
        } else if ($this->outputmode == self::OUTPUT_HTML) {
            $ci = 0;
            $this->rownb++;
            if (is_array($status)) {
                $status = implode(html_writer::empty_tag('br'), $status);
            }
            if ($outcome) {
                $outcome = $OUTPUT->pix_icon('i/valid', '');
            } else {
                $outcome = $OUTPUT->pix_icon('i/invalid', '');
            }
            echo html_writer::start_tag('tr', array('class' => 'r' . $this->rownb % 2));
            echo html_writer::tag('td', $line, array('class' => 'c' . $ci++));
            echo html_writer::tag('td', $outcome, array('class' => 'c' . $ci++));
            echo html_writer::tag('td', isset($data['id']) ? $data['id'] : '', array('class' => 'c' . $ci++));
            echo html_writer::tag('td', isset($data['shortname']) ? $data['shortname'] : '', array('class' => 'c' . $ci++));
            echo html_writer::tag('td', isset($data['fullname']) ? $data['fullname'] : '', array('class' => 'c' . $ci++));
            echo html_writer::tag('td', isset($data['idnumber']) ? $data['idnumber'] : '', array('class' => 'c' . $ci++));
            echo html_writer::tag('td', $status, array('class' => 'c' . $ci++));
            echo html_writer::end_tag('tr');
        }
    }