1 files changed, 38 insertions, 0 deletions
diff --git a/demo/graphviz/interfaces.py b/demo/graphviz/interfaces.py
new file mode 100644
index 0000000..f1c76c9
--- /dev/null
+++ b/demo/graphviz/interfaces.py
@@ -0,0 +1,38 @@
+
+# Copyright (c) 2011,  2012 Free Software Foundation
+
+#     This program is free software: you can redistribute it and/or modify
+#     it under the terms of the GNU Affero General Public License as
+#     published by the Free Software Foundation, either version 3 of the
+#     License, or (at your option) any later version.
+
+#     This program 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 Affero General Public License for more details.
+
+#     You should have received a copy of the GNU Affero General Public License
+#     along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+
+"""
+"""
+
+   
+class IGraphRoot:
+    def gv_edges(self, graph):
+        raise Exception('not implemented') 
+    def gv_nodes(self, graph):
+        raise Exception('not implemented') 
+
+class INode:
+    def gv_node_label(self, graph):
+        return unicode(self)
+
+class IEdge:
+    def gv_ends(self, graph):
+        ''' should returns (node_source, node_target)
+        '''
+        raise Exception('not implemented') 
+    def gv_edge_label(self, graph):
+        return unicode(self)