ListSFTP Processor allow incoming connection

[#1]

Hi
Is there a way that I can extend ListSFTP as a custom processor to allow inward connection somewhere like this

@InputRequirement(InputRequirement.Requirement.INPUT_REQUIRED)
public class ListDynamiscSFTP extends ListSFTP {
  // ...
}

 Iam completely new to Nifi and not able to identify how to implement this code further