name-tree.hpp

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/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/*
 * Copyright (c) 2014-2019,  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,
 *                           The University of Memphis.
 *
 * 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_DAEMON_TABLE_NAME_TREE_HPP
#define NFD_DAEMON_TABLE_NAME_TREE_HPP

#include "name-tree-iterator.hpp"

namespace nfd {
namespace name_tree {

class NameTree : noncopyable
{
public:
  explicit
  NameTree(size_t nBuckets = 1024);

public: // information
  static constexpr size_t
  getMaxDepth()
  {
    return 32;
  }

  size_t
  size() const
  {
    return m_ht.size();
  }

  size_t
  getNBuckets() const
  {
    return m_ht.getNBuckets();
  }

  template<typename EntryT>
  Entry*
  getEntry(const EntryT& tableEntry) const
  {
    return Entry::get(tableEntry);
  }

public: // mutation
  Entry&
  lookup(const Name& name, size_t prefixLen);

  Entry&
  lookup(const Name& name)
  {
    return this->lookup(name, name.size());
  }

  Entry&
  lookup(const fib::Entry& fibEntry);

  Entry&
  lookup(const pit::Entry& pitEntry);

  Entry&
  lookup(const measurements::Entry& measurementsEntry);

  Entry&
  lookup(const strategy_choice::Entry& strategyChoiceEntry);

  size_t
  eraseIfEmpty(Entry* entry, bool canEraseAncestors = true);

public: // matching
  Entry*
  findExactMatch(const Name& name, size_t prefixLen = std::numeric_limits<size_t>::max()) const;

  Entry*
  findLongestPrefixMatch(const Name& name,
                         const EntrySelector& entrySelector = AnyEntry()) const;

  Entry*
  findLongestPrefixMatch(const Entry& entry,
                         const EntrySelector& entrySelector = AnyEntry()) const;

  template<typename EntryT>
  Entry*
  findLongestPrefixMatch(const EntryT& tableEntry,
                         const EntrySelector& entrySelector = AnyEntry()) const
  {
    const Entry* nte = this->getEntry(tableEntry);
    BOOST_ASSERT(nte != nullptr);
    return this->findLongestPrefixMatch(*nte, entrySelector);
  }

  Entry*
  findLongestPrefixMatch(const pit::Entry& pitEntry,
                         const EntrySelector& entrySelector = AnyEntry()) const;

  Range
  findAllMatches(const Name& name,
                 const EntrySelector& entrySelector = AnyEntry()) const;

public: // enumeration
  using const_iterator = Iterator;

  Range
  fullEnumerate(const EntrySelector& entrySelector = AnyEntry()) const;

  Range
  partialEnumerate(const Name& prefix,
                   const EntrySubTreeSelector& entrySubTreeSelector = AnyEntrySubTree()) const;

  const_iterator
  begin() const
  {
    return fullEnumerate().begin();
  }

  const_iterator
  end() const
  {
    return Iterator();
  }

private:
  Hashtable m_ht;

  friend class EnumerationImpl;
};

} // namespace name_tree

using name_tree::NameTree;

} // namespace nfd

#endif // NFD_DAEMON_TABLE_NAME_TREE_HPP