private function getSubjectIdentityMapper(EntityManagerInterface $em)
    {
        if (null === $this->subjectIdentityMapper) {
            $this->subjectIdentityMapper = new EmbeddableMapper($em, SubjectIdentity::class);
        }

        return $this->subjectIdentityMapper;
    }
private function getSubjectIdentityMapper(EntityManagerInterface $em)
    {
        if (null === $this->subjectIdentityMapper) {
            $this->subjectIdentityMapper = new EmbeddableMapper($em, SubjectIdentity::class);
        }

        return $this->subjectIdentityMapper;
    }
Returns the subjectIdentityMapper.

@param EntityManagerInterface $em

@return EmbeddableMapper