public function getFeatureFeatureTypes($criteria = null, ConnectionInterface $con = null)
    {
        $partial = $this->collFeatureFeatureTypesPartial && !$this->isNew();
        if (null === $this->collFeatureFeatureTypes || null !== $criteria  || $partial) {
            if ($this->isNew() && null === $this->collFeatureFeatureTypes) {
                // return empty collection
                $this->initFeatureFeatureTypes();
            } else {
                $collFeatureFeatureTypes = ChildFeatureFeatureTypeQuery::create(null, $criteria)
                    ->filterByFeatureType($this)
                    ->find($con);

                if (null !== $criteria) {
                    if (false !== $this->collFeatureFeatureTypesPartial && count($collFeatureFeatureTypes)) {
                        $this->initFeatureFeatureTypes(false);

                        foreach ($collFeatureFeatureTypes as $obj) {
                            if (false == $this->collFeatureFeatureTypes->contains($obj)) {
                                $this->collFeatureFeatureTypes->append($obj);
                            }
                        }

                        $this->collFeatureFeatureTypesPartial = true;
                    }

                    reset($collFeatureFeatureTypes);

                    return $collFeatureFeatureTypes;
                }

                if ($partial && $this->collFeatureFeatureTypes) {
                    foreach ($this->collFeatureFeatureTypes as $obj) {
                        if ($obj->isNew()) {
                            $collFeatureFeatureTypes[] = $obj;
                        }
                    }
                }

                $this->collFeatureFeatureTypes = $collFeatureFeatureTypes;
                $this->collFeatureFeatureTypesPartial = false;
            }
        }

        return $this->collFeatureFeatureTypes;
    }