strategy-choice.hpp

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

#include "strategy-choice-entry.hpp"
#include "name-tree.hpp"

namespace nfd {

class StrategyChoice : noncopyable
{
public:
  StrategyChoice(NameTree& nameTree, shared_ptr<fw::Strategy> defaultStrategy);

public: // available Strategy types
  bool
  hasStrategy(const Name& strategyName, bool isExact = false) const;

  bool
  install(shared_ptr<fw::Strategy> strategy);

public: // Strategy Choice table
  bool
  insert(const Name& prefix, const Name& strategyName);

  void
  erase(const Name& prefix);

  std::pair<bool, Name>
  get(const Name& prefix) const;

public: // effective strategy
  fw::Strategy&
  findEffectiveStrategy(const Name& prefix) const;

  fw::Strategy&
  findEffectiveStrategy(const pit::Entry& pitEntry) const;

  fw::Strategy&
  findEffectiveStrategy(const measurements::Entry& measurementsEntry) const;

public: // enumeration
  class const_iterator
    : public std::iterator<std::forward_iterator_tag, const strategy_choice::Entry>
  {
  public:
    explicit
    const_iterator(const NameTree::const_iterator& it);

    ~const_iterator();

    const strategy_choice::Entry&
    operator*() const;

    shared_ptr<strategy_choice::Entry>
    operator->() const;

    const_iterator&
    operator++();

    const_iterator
    operator++(int);

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

    bool
    operator!=(const const_iterator& other) const;

  private:
    NameTree::const_iterator m_nameTreeIterator;
  };

  size_t
  size() const;

  const_iterator
  begin() const;

  const_iterator
  end() const;

private:
  fw::Strategy*
  getStrategy(const Name& strategyName) const;

  void
  setDefaultStrategy(shared_ptr<fw::Strategy> strategy);

  void
  changeStrategy(strategy_choice::Entry& entry,
                 fw::Strategy& oldStrategy,
                 fw::Strategy& newStrategy);

  fw::Strategy&
  findEffectiveStrategy(shared_ptr<name_tree::Entry> nte) const;

private:
  NameTree& m_nameTree;
  size_t m_nItems;

  typedef std::map<Name, shared_ptr<fw::Strategy> > StrategyInstanceTable;
  StrategyInstanceTable m_strategyInstances;
};

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

inline StrategyChoice::const_iterator
StrategyChoice::end() const
{
  return const_iterator(m_nameTree.end());
}

inline
StrategyChoice::const_iterator::const_iterator(const NameTree::const_iterator& it)
  : m_nameTreeIterator(it)
{
}

inline
StrategyChoice::const_iterator::~const_iterator()
{
}

inline
StrategyChoice::const_iterator
StrategyChoice::const_iterator::operator++(int)
{
  StrategyChoice::const_iterator temp(*this);
  ++(*this);
  return temp;
}

inline StrategyChoice::const_iterator&
StrategyChoice::const_iterator::operator++()
{
  ++m_nameTreeIterator;
  return *this;
}

inline const strategy_choice::Entry&
StrategyChoice::const_iterator::operator*() const
{
  return *(m_nameTreeIterator->getStrategyChoiceEntry());
}

inline shared_ptr<strategy_choice::Entry>
StrategyChoice::const_iterator::operator->() const
{
  return m_nameTreeIterator->getStrategyChoiceEntry();
}

inline bool
StrategyChoice::const_iterator::operator==(const StrategyChoice::const_iterator& other) const
{
  return m_nameTreeIterator == other.m_nameTreeIterator;
}

inline bool
StrategyChoice::const_iterator::operator!=(const StrategyChoice::const_iterator& other) const
{
  return m_nameTreeIterator != other.m_nameTreeIterator;
}

} // namespace nfd

#endif // NFD_DAEMON_TABLE_STRATEGY_CHOICE_HPP