[ndnSIM] Are there any interfaces to get a node's adjacent nodes?

[lxzhao at njnet.edu.cn]

Hi，everyone
  I am new in ndnSIM and meet with some problems.
  Now I can locate all the leaf-nodes in a topology and just want to get
their access router except searching the topology file line-by-line. I
looked up the API document but failed.So are there any interfaces in
ndnSIM that can get a node's adjacent nodes?
   Look forward to your reply!

   Best regards,Lixia Zhao