blob: aea7d05c29e01ef12223fdd9b28548d54334ca53 [file] [log] [blame]
/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/*
* Copyright (c) 2013-2017 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.
*
* @author Eric Newberry <enewberry@email.arizona.edu>
*/
#include "cache-policy.hpp"
#include "../encoding/block-helpers.hpp"
namespace ndn {
namespace lp {
std::ostream&
operator<<(std::ostream& os, CachePolicyType policy)
{
switch (policy) {
case CachePolicyType::NO_CACHE:
os << "NoCache";
break;
default:
os << "None";
break;
}
return os;
}
CachePolicy::CachePolicy()
: m_policy(CachePolicyType::NONE)
{
}
CachePolicy::CachePolicy(const Block& block)
{
wireDecode(block);
}
template<encoding::Tag TAG>
size_t
CachePolicy::wireEncode(EncodingImpl<TAG>& encoder) const
{
if (m_policy == CachePolicyType::NONE) {
BOOST_THROW_EXCEPTION(Error("CachePolicyType must be set"));
}
size_t length = 0;
length += prependNonNegativeIntegerBlock(encoder, tlv::CachePolicyType, static_cast<uint32_t>(m_policy));
length += encoder.prependVarNumber(length);
length += encoder.prependVarNumber(tlv::CachePolicy);
return length;
}
NDN_CXX_DEFINE_WIRE_ENCODE_INSTANTIATIONS(CachePolicy);
const Block&
CachePolicy::wireEncode() const
{
if (m_policy == CachePolicyType::NONE) {
BOOST_THROW_EXCEPTION(Error("CachePolicyType must be set"));
}
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
CachePolicy::wireDecode(const Block& wire)
{
if (wire.type() != tlv::CachePolicy) {
BOOST_THROW_EXCEPTION(Error("expecting CachePolicy block"));
}
m_wire = wire;
m_wire.parse();
Block::element_const_iterator it = m_wire.elements_begin();
if (it != m_wire.elements_end() && it->type() == tlv::CachePolicyType) {
m_policy = static_cast<CachePolicyType>(readNonNegativeInteger(*it));
if (this->getPolicy() == CachePolicyType::NONE) {
BOOST_THROW_EXCEPTION(Error("unknown CachePolicyType"));
}
}
else {
BOOST_THROW_EXCEPTION(Error("expecting CachePolicyType block"));
}
}
CachePolicyType
CachePolicy::getPolicy() const
{
switch (m_policy) {
case CachePolicyType::NO_CACHE:
return m_policy;
default:
return CachePolicyType::NONE;
}
}
CachePolicy&
CachePolicy::setPolicy(CachePolicyType policy)
{
m_policy = policy;
m_wire.reset();
return *this;
}
} // namespace lp
} // namespace ndn