protected function _getPaddedLine($content)
    {
        if (!is_array($content)) $content = array( $content );
        if ($this->column_size===0 && $this->line_size===0 && $this->cell_size===0) {
            $this->_parseTableSizes();
        }
        if (count($content) > $this->getColumnSize()) {
            $this->_repadAllLines();
        } elseif (count($content) < $this->getColumnSize() && ($this->getPadFlag() & self::PAD_BY_EMPTY_CELLS)) {
            $content = array_pad($content, $this->getColumnSize(), '');
        }
        return $content;
    }