/* -*- 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
 *
 * 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_TABLE_PIT_HPP
#define NFD_TABLE_PIT_HPP

#include "name-tree.hpp"
#include "pit-entry.hpp"

namespace nfd {
namespace pit {

/** \class DataMatchResult
 *  \brief an unordered iterable of all PIT entries matching Data
 *  This type shall support:
 *    iterator<shared_ptr<pit::Entry>> begin()
 *    iterator<shared_ptr<pit::Entry>> end()
 */
typedef std::vector<shared_ptr<pit::Entry> > DataMatchResult;

} // namespace pit

/** \class Pit
 *  \brief represents the PIT
 */
class Pit : noncopyable
{
public:
  explicit
  Pit(NameTree& nameTree);

  ~Pit();

  /**
   *  \brief Get the number of items stored in the PIT.
   */
  size_t
  size() const;

  /** \brief inserts a FIB entry for prefix
   *  If an entry for exact same prefix exists, that entry is returned.
   *  \return{ the entry, and true for new entry, false for existing entry }
   */
  std::pair<shared_ptr<pit::Entry>, bool>
  insert(const Interest& interest);

  /** \brief performs a Data match
   *  \return{ an iterable of all PIT entries matching data }
   */
  shared_ptr<pit::DataMatchResult>
  findAllDataMatches(const Data& data) const;

  /**
   *  \brief Erase a PIT Entry
   */
  void
  erase(shared_ptr<pit::Entry> pitEntry);

private:
  NameTree& m_nameTree;
  size_t m_nItems;
};

inline size_t
Pit::size() const
{
  return m_nItems;
}

} // namespace nfd

#endif // NFD_TABLE_PIT_HPP