Jackalope\NodeType\NodeType::getSupertypeNames PHP Method

    public function getSupertypeNames()
    {
        if (null === $this->superTypeNames) {
            $this->superTypeNames = array();
            foreach ($this->getSupertypes() as $superType) {
                $this->superTypeNames[] = $superType->getName();
            }
        }
        return $this->superTypeNames;
    }