1 files changed, 57 insertions, 0 deletions
diff --git a/netmodel/network/flow.py b/netmodel/network/flow.py
new file mode 100644
index 00000000..bce4512c
--- /dev/null
+++ b/netmodel/network/flow.py
@@ -0,0 +1,57 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+#
+# Copyright (c) 2017 Cisco and/or its affiliates.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at:
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+class Flow:
+    def __init__(self, source, destination):
+        """
+        Constructor.
+        Args:
+            source: The source Prefix of this Flow.
+            destination: The destination Prefix of this Flow.
+        """
+        self.source = source
+        self.destination = destination
+
+    def get_reverse(self):
+        """
+        Make the reverse Flow of this Flow.
+        Returns:
+            The reverse Flow.
+        """
+        return Flow(self.destination, self.source)
+
+    def __eq__(self, other):
+        """
+        Tests whether two Flows are equal or not.
+        Args:
+            other: A Flow instance.
+        Returns:
+            True iif self == other.
+        """
+        if self.source and other.source and self.source != other.source:
+            return False
+        if self.destination and other.destination and self.destination != other.destination:
+            return False
+        return True
+
+    def __hash__(self):
+        # Order is important
+        return hash((self.source, self.destination))
+
+    def __repr__(self):
+        return "<Flow %s -> %s>" % (self.source, self.destination)