name-tree-iterator.hpp

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/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
#ifndef NFD_DAEMON_TABLE_NAME_TREE_ITERATOR_HPP
#define NFD_DAEMON_TABLE_NAME_TREE_ITERATOR_HPP

#include "name-tree-hashtable.hpp"

namespace nfd {
namespace name_tree {

class NameTree;

typedef function<bool(const Entry& entry)> EntrySelector;

struct AnyEntry
{
  bool
  operator()(const Entry& entry) const
  {
    return true;
  }
};

typedef function<std::pair<bool,bool>(const Entry& entry)> EntrySubTreeSelector;

struct AnyEntrySubTree
{
  std::pair<bool, bool>
  operator()(const Entry& entry) const
  {
    return {true, true};
  }
};

class EnumerationImpl;

class Iterator : public std::iterator<std::forward_iterator_tag, const Entry>
{
public:
  Iterator();

  Iterator(shared_ptr<EnumerationImpl> impl, const Entry* ref);

  const Entry&
  operator*() const
  {
    BOOST_ASSERT(m_impl != nullptr);
    return *m_entry;
  }

  const Entry*
  operator->() const
  {
    BOOST_ASSERT(m_impl != nullptr);
    return m_entry;
  }

  Iterator&
  operator++();

  Iterator
  operator++(int);

  bool
  operator==(const Iterator& other) const;

  bool
  operator!=(const Iterator& other) const
  {
    return !this->operator==(other);
  }

private:
  shared_ptr<EnumerationImpl> m_impl;

  const Entry* m_entry;

  const Entry* m_ref;

  int m_state;

  friend std::ostream& operator<<(std::ostream&, const Iterator&);
  friend class FullEnumerationImpl;
  friend class PartialEnumerationImpl;
  friend class PrefixMatchImpl;
};

std::ostream&
operator<<(std::ostream& os, const Iterator& i);

class EnumerationImpl
{
public:
  explicit
  EnumerationImpl(const NameTree& nt);

  virtual void
  advance(Iterator& i) = 0;

protected:
  const NameTree& nt;
  const Hashtable& ht;
};

class FullEnumerationImpl : public EnumerationImpl
{
public:
  FullEnumerationImpl(const NameTree& nt, const EntrySelector& pred);

  virtual void
  advance(Iterator& i) override;

private:
  EntrySelector m_pred;
};

class PartialEnumerationImpl : public EnumerationImpl
{
public:
  PartialEnumerationImpl(const NameTree& nt, const EntrySubTreeSelector& pred);

  virtual void
  advance(Iterator& i) override;

private:
  EntrySubTreeSelector m_pred;
};

class PrefixMatchImpl : public EnumerationImpl
{
public:
  PrefixMatchImpl(const NameTree& nt, const EntrySelector& pred);

private:
  virtual void
  advance(Iterator& i) override;

private:
  EntrySelector m_pred;
};

typedef boost::iterator_range<Iterator> Range;

} // namespace name_tree
} // namespace nfd

#endif // NFD_DAEMON_TABLE_NAME_TREE_ITERATOR_HPP