public function getTableClass($className) {
        $tableClass= null;
        if ($className= $this->loadClass($className)) {
            if (isset ($this->map[$className]['table'])) {
                $tableClass= $className;
            }
            if (!$tableClass && $ancestry= $this->getAncestry($className, false)) {
                foreach ($ancestry as $ancestor) {
                    if (isset ($this->map[$ancestor]['table'])) {
                        $tableClass= $ancestor;
                        break;
                    }
                }
            }
        }
        if ($tableClass) {
            if ($this->getDebug() === true) {
                $this->log(xPDO::LOG_LEVEL_DEBUG, 'Returning table class: ' . $tableClass . ' for class: ' . $className);
            }
        } else {
            $this->log(xPDO::LOG_LEVEL_ERROR, 'Could not get table class for class: ' . $className);
        }
        return $tableClass;
    }