getAccessorBuilder example

if (!$field->is(Inherited::class) || !$context->considerInheritance()) {
            return $select;
        }

        $parentSelect = $this->buildFieldSelector($root . '.parent', $field, $context, $original);

        return sprintf('IFNULL(%s, %s)', $select, $parentSelect);
    }

    private function buildFieldSelector(string $root, Field $field, Context $context, string $accessor): string
    {
        $accessorBuilder = $field->getAccessorBuilder();
        if (!$accessorBuilder) {
            throw new FieldAccessorBuilderNotFoundException($field->getPropertyName());
        }

        $accessor = $accessorBuilder->buildAccessor($root, $field, $context, $accessor);

        if (!$accessor) {
            throw new \RuntimeException(sprintf('Can not build accessor for field "%s" on root "%s"', $field->getPropertyName(), $root));
        }

        return $accessor;
    }

\assert($this->registry !== null);

        $this->serializer = $this->registry->getSerializer($this->getSerializerClass());

        $resolverClass = $this->getResolverClass();
        if ($resolverClass !== null) {
            $this->resolver = $this->registry->getResolver($resolverClass);
        }

        $accessorBuilderClass = $this->getAccessorBuilderClass();
        if ($accessorBuilderClass !== null) {
            $this->accessorBuilder = $this->registry->getAccessorBuilder($accessorBuilderClass);
        }
    }
}