Doctrine\ODM\PHPCR\Mapping\ClassMetadata::getChildClasses PHP Method

    public function getChildClasses()
    {
        return $this->childClasses;
    }

 private function unrestrictChildClass(string $class, ClassMetadata $metadata)
 {
     if (!$class) {
         return;
     }
     if (!($childClasses = $metadata->getChildClasses())) {
         return;
     }
     $childClasses[] = $class;
     $metadata->setChildClasses($childClasses);
 }