public function getOperatorForSchema(LdapObjectSchema $schema, array $filter)
    {
        $operator = null;
        
        $categoryOperator = $this->getCategoryOperator($schema->getObjectCategory());
        $classOperator = $this->getClassOperator($schema->getObjectClass());

        if ($classOperator && $categoryOperator) {
            $operator = $this->filterBuilder->bAnd($categoryOperator, $classOperator);
        } elseif ($categoryOperator) {
            $operator = $categoryOperator;
        } elseif ($classOperator) {
            $operator = $classOperator;
        }
        
        return $this->getOperatorForArray($filter, $operator);
    }