First stab at using real exception handling instead of returning [None] everywhere

python/modes_exceptions.py

@@ -0,0 +1,42 @@
+#
+# Copyright 2012 Nick Foster
+# 
+# This file is part of gr-air-modes
+# 
+# gr-air-modes is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3, or (at your option)
+# any later version.
+# 
+# gr-air-modes is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+# 
+# You should have received a copy of the GNU General Public License
+# along with gr-air-modes; see the file COPYING.  If not, write to
+# the Free Software Foundation, Inc., 51 Franklin Street,
+# Boston, MA 02110-1301, USA.
+# 
+
+class ADSBError(Exception):
+    pass
+
+class MetricAltError(ADSBError):
+    pass
+        
+class ParserError(ADSBError):
+    pass
+
+class NoHandlerError(ADSBError):
+    def __init__(self, msgtype):
+        self.msgtype = msgtype
+
+class MlatNonConvergeError(ADSBError):
+    pass
+
+class CPRNoPositionError(ADSBError):
+    pass
+
+class CPRBoundaryStraddleError(CPRNoPositionError):
+    pass