From 21f29c6bf70d81ab2a16deb5cda13cecf9452d9a Mon Sep 17 00:00:00 2001
From: Nathaniel Manista <nathaniel@google.com>
Date: Sat, 24 Jan 2015 00:05:22 +0000
Subject: Add the _framework.base package.

---
 src/python/_framework/base/packets/null.py | 56 ++++++++++++++++++++++++++++++
 1 file changed, 56 insertions(+)
 create mode 100644 src/python/_framework/base/packets/null.py

(limited to 'src/python/_framework/base/packets/null.py')

diff --git a/src/python/_framework/base/packets/null.py b/src/python/_framework/base/packets/null.py
new file mode 100644
index 0000000000..9b40a00505
--- /dev/null
+++ b/src/python/_framework/base/packets/null.py
@@ -0,0 +1,56 @@
+# Copyright 2015, Google Inc.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+"""Null links that ignore tickets passed to them."""
+
+from _framework.base.packets import interfaces
+
+
+class _NullForeLink(interfaces.ForeLink):
+  """A do-nothing ForeLink."""
+
+  def accept_back_to_front_ticket(self, ticket):
+    pass
+
+  def join_rear_link(self, rear_link):
+    raise NotImplementedError()
+
+
+class _NullRearLink(interfaces.RearLink):
+  """A do-nothing RearLink."""
+
+  def accept_front_to_back_ticket(self, ticket):
+    pass
+
+  def join_fore_link(self, fore_link):
+    raise NotImplementedError()
+
+
+NULL_FORE_LINK = _NullForeLink()
+NULL_REAR_LINK = _NullRearLink()
-- 
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