rib: Implement RIB as trie

refs: #1271

Change-Id: Idbd6d4d67f8a88b474ea0b20280c79e367bc98e5
diff --git a/rib/face-entry.hpp b/rib/face-entry.hpp
new file mode 100644
index 0000000..88531f6
--- /dev/null
+++ b/rib/face-entry.hpp
@@ -0,0 +1,70 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/**
+ * Copyright (c) 2014,  Regents of the University of California,
+ *                      Arizona Board of Regents,
+ *                      Colorado State University,
+ *                      University Pierre & Marie Curie, Sorbonne University,
+ *                      Washington University in St. Louis,
+ *                      Beijing Institute of Technology,
+ *                      The University of Memphis
+ *
+ * This file is part of NFD (Named Data Networking Forwarding Daemon).
+ * See AUTHORS.md for complete list of NFD authors and contributors.
+ *
+ * NFD 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 of the License, or (at your option) any later version.
+ *
+ * NFD 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
+ * NFD, e.g., in COPYING.md file.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef NFD_RIB_FACE_ENTRY_HPP
+#define NFD_RIB_FACE_ENTRY_HPP
+
+namespace nfd {
+namespace rib {
+
+/** \class FaceEntry
+ *  \brief represents a route for a name prefix
+ */
+class FaceEntry
+{
+public:
+  FaceEntry()
+    : faceId(0)
+    , origin(0)
+    , flags(0)
+    , cost(0)
+    , expires(time::steady_clock::TimePoint::min())
+  {
+  }
+
+public:
+  uint64_t faceId;
+  uint64_t origin;
+  uint64_t flags;
+  uint64_t cost;
+  time::steady_clock::TimePoint expires;
+};
+
+inline bool
+compareFaceIdAndOrigin(const FaceEntry& entry1, const FaceEntry& entry2)
+{
+  return (entry1.faceId == entry2.faceId && entry1.origin == entry2.origin);
+}
+
+inline bool
+compareFaceId(const FaceEntry& entry, const uint64_t faceId)
+{
+  return (entry.faceId == faceId);
+}
+
+} // namespace rib
+} // namespace nfd
+
+#endif // NFD_RIB_RIB_ENTRY_HPP