interest.hpp

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/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/*
 * Copyright (c) 2013-2018 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.
 */

#ifndef NDN_INTEREST_HPP
#define NDN_INTEREST_HPP

#include "delegation-list.hpp"
#include "name.hpp"
#include "packet-base.hpp"
#include "selectors.hpp"
#include "util/time.hpp"

namespace ndn {

class Data;

const time::milliseconds DEFAULT_INTEREST_LIFETIME = 4_s;

class Interest : public PacketBase, public enable_shared_from_this<Interest>
{
public:
  class Error : public tlv::Error
  {
  public:
    explicit
    Error(const std::string& what)
      : tlv::Error(what)
    {
    }
  };

  explicit
  Interest(const Name& name = Name(), time::milliseconds interestLifetime = DEFAULT_INTEREST_LIFETIME);

  explicit
  Interest(const Block& wire);

  template<encoding::Tag TAG>
  size_t
  wireEncode(EncodingImpl<TAG>& encoder) const;

  const Block&
  wireEncode() const;

  void
  wireDecode(const Block& wire);

  bool
  hasWire() const
  {
    return m_wire.hasWire();
  }

  std::string
  toUri() const;

public: // matching
  bool
  matchesName(const Name& name) const;

  bool
  matchesData(const Data& data) const;

  bool
  matchesInterest(const Interest& other) const;

public: // Name, Nonce, and Guiders
  const Name&
  getName() const
  {
    return m_name;
  }

  Interest&
  setName(const Name& name)
  {
    m_name = name;
    m_wire.reset();
    return *this;
  }

  bool
  hasNonce() const
  {
    return static_cast<bool>(m_nonce);
  }

  uint32_t
  getNonce() const;

  Interest&
  setNonce(uint32_t nonce);

  void
  refreshNonce();

  time::milliseconds
  getInterestLifetime() const
  {
    return m_interestLifetime;
  }

  Interest&
  setInterestLifetime(time::milliseconds interestLifetime);

  const DelegationList&
  getForwardingHint() const
  {
    return m_forwardingHint;
  }

  Interest&
  setForwardingHint(const DelegationList& value);

  template<typename Modifier>
  Interest&
  modifyForwardingHint(const Modifier& modifier)
  {
    modifier(m_forwardingHint);
    m_wire.reset();
    return *this;
  }

public: // Selectors
  bool
  hasSelectors() const
  {
    return !m_selectors.empty();
  }

  const Selectors&
  getSelectors() const
  {
    return m_selectors;
  }

  Interest&
  setSelectors(const Selectors& selectors)
  {
    m_selectors = selectors;
    m_wire.reset();
    return *this;
  }

  int
  getMinSuffixComponents() const
  {
    return m_selectors.getMinSuffixComponents();
  }

  Interest&
  setMinSuffixComponents(int minSuffixComponents)
  {
    m_selectors.setMinSuffixComponents(minSuffixComponents);
    m_wire.reset();
    return *this;
  }

  int
  getMaxSuffixComponents() const
  {
    return m_selectors.getMaxSuffixComponents();
  }

  Interest&
  setMaxSuffixComponents(int maxSuffixComponents)
  {
    m_selectors.setMaxSuffixComponents(maxSuffixComponents);
    m_wire.reset();
    return *this;
  }

  const KeyLocator&
  getPublisherPublicKeyLocator() const
  {
    return m_selectors.getPublisherPublicKeyLocator();
  }

  Interest&
  setPublisherPublicKeyLocator(const KeyLocator& keyLocator)
  {
    m_selectors.setPublisherPublicKeyLocator(keyLocator);
    m_wire.reset();
    return *this;
  }

  const Exclude&
  getExclude() const
  {
    return m_selectors.getExclude();
  }

  Interest&
  setExclude(const Exclude& exclude)
  {
    m_selectors.setExclude(exclude);
    m_wire.reset();
    return *this;
  }

  int
  getChildSelector() const
  {
    return m_selectors.getChildSelector();
  }

  Interest&
  setChildSelector(int childSelector)
  {
    m_selectors.setChildSelector(childSelector);
    m_wire.reset();
    return *this;
  }

  int
  getMustBeFresh() const
  {
    return m_selectors.getMustBeFresh();
  }

  Interest&
  setMustBeFresh(bool mustBeFresh)
  {
    m_selectors.setMustBeFresh(mustBeFresh);
    m_wire.reset();
    return *this;
  }

private:
  Name m_name;
  Selectors m_selectors;
  mutable optional<uint32_t> m_nonce;
  time::milliseconds m_interestLifetime;
  DelegationList m_forwardingHint;

  mutable Block m_wire;
};

NDN_CXX_DECLARE_WIRE_ENCODE_INSTANTIATIONS(Interest);

std::ostream&
operator<<(std::ostream& os, const Interest& interest);

inline bool
operator==(const Interest& lhs, const Interest& rhs)
{
  return lhs.wireEncode() == rhs.wireEncode();
}

inline bool
operator!=(const Interest& lhs, const Interest& rhs)
{
  return !(lhs == rhs);
}

} // namespace ndn

#endif // NDN_INTEREST_HPP