public final function getParentProject() {
        if (\is_null($this->__parent__project)) {
            $result = ProjectUtil::searchRelativeProject($this);
            if (\count($result) < 1) {
                throw new ProjectMemberNotFoundException("SOURCE ROAD NOT FOUND");
            }
            $this->__parent__project = $result[0];
        }
        return $this->__parent__project;
    }