Make conf private, expose the nick name from env

sugar/activity/Activity.py

@@ -7,7 +7,7 @@ import gtk
 import gobject
 
 from sugar.presence.PresenceService import PresenceService
-from sugar.conf import ActivityRegistry
+from sugar import activity
 import sugar.util
 
 ACTIVITY_SERVICE_NAME = "org.laptop.Activity"
@@ -20,7 +20,6 @@ def get_service_name(xid):
 def get_object_path(xid):
 	return ACTIVITY_SERVICE_PATH + "/%s" % xid 
 
-
 class ActivityDbusService(dbus.service.Object):
 	"""Base dbus service object that each Activity uses to export dbus methods.
 	
@@ -91,7 +90,7 @@ class Activity(gtk.Window):
 	def set_type(self, activity_type):
 		"""Sets the activity type."""
 		self._activity_type = activity_type
-		self._default_type = ActivityRegistry.get_default_type(activity_type)
+		self._default_type = activity.get_default_type(activity_type)
 
 	def get_type(self):
 		"""Gets the activity type."""

sugar/activity/__init__.py

@@ -0,0 +1,8 @@
+def get_default_type(activity_type):
+	"""Get the activity default type.
+
+	   It's the type of the main network service which tracks presence
+       and provides info about the activity, for example the title."""
+	splitted_id = activity_type.split('.')
+	splitted_id.reverse()
+	return '_' + '_'.join(splitted_id) + '._udp'