management: ensure Element::Error inherits from tlv::Error

Add static asserts to ensure ndn::nfd::*::Error are subclasses of tlv::Error.

Add WireEncodable and WireDecodable concept checks to
ndn::nfd::* classes that represent TLV abstraction.

Move definition of ChannelStatus, FibEntry, ForwarderStatus,
StrategyChoice methods into .cpp.

Move declaration of FaceScope, FacePersistency, LinkType
into encoding/nfd-constants.hpp.

Eliminate duplicate RibFlags declaration.

refs #1983

Change-Id: I207bae479aa6da54a581a7cca5b2a13743827ff0
diff --git a/src/management/nfd-strategy-choice.cpp b/src/management/nfd-strategy-choice.cpp
new file mode 100644
index 0000000..9296954
--- /dev/null
+++ b/src/management/nfd-strategy-choice.cpp
@@ -0,0 +1,131 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/**
+ * Copyright (c) 2013-2014 Regents of the University of California.
+ *
+ * This file is part of ndn-cxx library (NDN C++ library with eXperimental eXtensions).
+ *
+ * ndn-cxx library is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU Lesser General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later version.
+ *
+ * ndn-cxx library 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 Lesser General Public License for more details.
+ *
+ * You should have received copies of the GNU General Public License and GNU Lesser
+ * General Public License along with ndn-cxx, e.g., in COPYING.md file.  If not, see
+ * <http://www.gnu.org/licenses/>.
+ *
+ * See AUTHORS.md for complete list of ndn-cxx authors and contributors.
+ */
+
+#include "nfd-strategy-choice.hpp"
+#include "encoding/tlv-nfd.hpp"
+#include "encoding/block-helpers.hpp"
+#include "util/concepts.hpp"
+
+namespace ndn {
+namespace nfd {
+
+//BOOST_CONCEPT_ASSERT((boost::EqualityComparable<StrategyChoice>));
+BOOST_CONCEPT_ASSERT((WireEncodable<StrategyChoice>));
+BOOST_CONCEPT_ASSERT((WireDecodable<StrategyChoice>));
+static_assert(std::is_base_of<tlv::Error, StrategyChoice::Error>::value,
+              "StrategyChoice::Error must inherit from tlv::Error");
+
+StrategyChoice::StrategyChoice()
+{
+}
+
+StrategyChoice::StrategyChoice(const Block& payload)
+{
+  this->wireDecode(payload);
+}
+
+template<bool T>
+size_t
+StrategyChoice::wireEncode(EncodingImpl<T>& encoder) const
+{
+  size_t totalLength = 0;
+
+  totalLength += prependNestedBlock(encoder, tlv::nfd::Strategy, m_strategy);
+  totalLength += m_name.wireEncode(encoder);
+
+  totalLength += encoder.prependVarNumber(totalLength);
+  totalLength += encoder.prependVarNumber(tlv::nfd::StrategyChoice);
+  return totalLength;
+}
+
+template size_t
+StrategyChoice::wireEncode<true>(EncodingImpl<true>& block) const;
+
+template size_t
+StrategyChoice::wireEncode<false>(EncodingImpl<false>& block) const;
+
+const Block&
+StrategyChoice::wireEncode() const
+{
+  if (m_wire.hasWire())
+    return m_wire;
+
+  EncodingEstimator estimator;
+  size_t estimatedSize = wireEncode(estimator);
+
+  EncodingBuffer buffer(estimatedSize, 0);
+  wireEncode(buffer);
+
+  m_wire = buffer.block();
+  return m_wire;
+}
+
+void
+StrategyChoice::wireDecode(const Block& block)
+{
+  if (block.type() != tlv::nfd::StrategyChoice) {
+    throw Error("expecting StrategyChoice block");
+  }
+  m_wire = block;
+  m_wire.parse();
+  Block::element_const_iterator val = m_wire.elements_begin();
+
+  if (val != m_wire.elements_end() && val->type() == tlv::Name) {
+    m_name.wireDecode(*val);
+    ++val;
+  }
+  else {
+    throw Error("missing required Name field");
+  }
+
+  if (val != m_wire.elements_end() && val->type() == tlv::nfd::Strategy) {
+    val->parse();
+    if (val->elements().empty()) {
+      throw Error("expecting Strategy/Name");
+    }
+    else {
+      m_strategy.wireDecode(*val->elements_begin());
+    }
+    ++val;
+  }
+  else {
+    throw Error("missing required Strategy field");
+  }
+}
+
+StrategyChoice&
+StrategyChoice::setName(const Name& name)
+{
+  m_wire.reset();
+  m_name = name;
+  return *this;
+}
+
+StrategyChoice&
+StrategyChoice::setStrategy(const Name& strategy)
+{
+  m_wire.reset();
+  m_strategy = strategy;
+  return *this;
+}
+
+} // namespace nfd
+} // namespace ndn