ScriptFUSION\Porter\Mapper\Strategy\SubImport::getOrCreateImportSpecification PHP Method

    private function getOrCreateImportSpecification($data, $context = null)
    {
        if ($this->specificationOrCallback instanceof ImportSpecification) {
            return $this->specificationOrCallback;
        }
        if (($specification = call_user_func($this->specificationOrCallback, $data, $context)) instanceof ImportSpecification) {
            return $specification;
        }
        throw new InvalidCallbackResultException('Callback failed to create an instance of ImportSpecification.');
    }