1 files changed, 46 insertions, 0 deletions
diff --git a/grc/python/Connection.py b/grc/python/Connection.py
new file mode 100644
index 000000000..341dd2d82
--- /dev/null
+++ b/grc/python/Connection.py
@@ -0,0 +1,46 @@
+"""
+Copyright 2008-2011 Free Software Foundation, Inc.
+This file is part of GNU Radio
+
+GNU Radio Companion 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 2
+of the License, or (at your option) any later version.
+
+GNU Radio Companion 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 this program; if not, write to the Free Software
+Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
+"""
+
+import Constants
+from .. base.Element import Element
+from .. base.Connection import Connection as _Connection
+from .. gui.Connection import Connection as _GUIConnection
+
+class Connection(_Connection, _GUIConnection):
+
+	def __init__(self, **kwargs):
+		_Connection.__init__(self, **kwargs)
+		_GUIConnection.__init__(self)
+
+	def is_msg(self):
+		return self.get_source().get_type() == self.get_sink().get_type() == 'msg'
+
+	def is_message(self):
+		return self.get_source().get_type() == self.get_sink().get_type() == 'message'
+
+	def validate(self):
+		"""
+		Validate the connections.
+		The ports must match in io size.
+		"""
+		Element.validate(self)
+		source_size = Constants.TYPE_TO_SIZEOF[self.get_source().get_type()] * self.get_source().get_vlen()
+		sink_size = Constants.TYPE_TO_SIZEOF[self.get_sink().get_type()] * self.get_sink().get_vlen()
+		if source_size != sink_size:
+			self.add_error_message('Source IO size "%s" does not match sink IO size "%s".'%(source_size, sink_size))