channel-status.cpp

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/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
#include "channel-status.hpp"
#include "encoding/tlv-nfd.hpp"
#include "encoding/block-helpers.hpp"
#include "util/concepts.hpp"

namespace ndn {
namespace nfd {

//BOOST_CONCEPT_ASSERT((boost::EqualityComparable<ChannelStatus>));
BOOST_CONCEPT_ASSERT((WireEncodable<ChannelStatus>));
BOOST_CONCEPT_ASSERT((WireDecodable<ChannelStatus>));
static_assert(std::is_base_of<tlv::Error, ChannelStatus::Error>::value,
              "ChannelStatus::Error must inherit from tlv::Error");

ChannelStatus::ChannelStatus()
{
}

ChannelStatus::ChannelStatus(const Block& payload)
{
  this->wireDecode(payload);
}

template<encoding::Tag TAG>
size_t
ChannelStatus::wireEncode(EncodingImpl<TAG>& encoder) const
{
  size_t totalLength = 0;

  totalLength += encoder.prependByteArrayBlock(tlv::nfd::LocalUri,
                 reinterpret_cast<const uint8_t*>(m_localUri.c_str()), m_localUri.size());

  totalLength += encoder.prependVarNumber(totalLength);
  totalLength += encoder.prependVarNumber(tlv::nfd::ChannelStatus);
  return totalLength;
}

template size_t
ChannelStatus::wireEncode<encoding::EncoderTag>(EncodingImpl<encoding::EncoderTag>&) const;

template size_t
ChannelStatus::wireEncode<encoding::EstimatorTag>(EncodingImpl<encoding::EstimatorTag>&) const;

const Block&
ChannelStatus::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
ChannelStatus::wireDecode(const Block& block)
{
  if (block.type() != tlv::nfd::ChannelStatus) {
    BOOST_THROW_EXCEPTION(Error("Expecting ChannelStatus 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::nfd::LocalUri) {
    m_localUri.assign(reinterpret_cast<const char*>(val->value()), val->value_size());
    ++val;
  }
  else {
    BOOST_THROW_EXCEPTION(Error("Missing required LocalUri field"));
  }
}

ChannelStatus&
ChannelStatus::setLocalUri(const std::string localUri)
{
  m_wire.reset();
  m_localUri = localUri;
  return *this;
}

} // namespace nfd
} // namespace ndn