src/adafruit_blinka/microcontroller/nova/__init__.py

   1 """Generic Connection class for Binho Nova to keep track of connection"""
   2
   3
   4 class Connection:
   5     """Connection class"""
   6
   7     __instance = None
   8
   9     @staticmethod
  10     def getInstance():
  11         """ Static access method. """
  12         if Connection.__instance is None:
  13             Connection()
  14         return Connection.__instance
  15
  16     def __init__(self):
  17         """ Virtually private constructor. """
  18         if Connection.__instance is not None:
  19             raise Exception("This class is a singleton!")
  20
  21         # pylint: disable=import-outside-toplevel
  22         from binhoHostAdapter import binhoHostAdapter
  23         from binhoHostAdapter import binhoUtilities
  24
  25         # pylint: enable=import-outside-toplevel
  26
  27         utilities = binhoUtilities.binhoUtilities()
  28         devices = utilities.listAvailableDevices()
  29
  30         if len(devices) > 0:
  31             Connection.__instance = binhoHostAdapter.binhoHostAdapter(devices[0])
  32         else:
  33             raise RuntimeError("No Binho Nova found!")