/* -*- C++ -*-

 * src/lemon/vector_map.h - Part of LEMON, a generic C++ optimization library

 *

 * Copyright (C) 2004 Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport

 * (Egervary Combinatorial Optimization Research Group, EGRES).

 *

 * Permission to use, modify and distribute this software is granted

 * provided that this copyright notice appears in all copies. For

 * precise terms see the accompanying LICENSE file.

 *

 * This software is provided "AS IS" with no warranty of any kind,

 * express or implied, and with no claim as to its suitability for any

 * purpose.

 *

 */

#ifndef LEMON_VECTOR_MAP_H

#define LEMON_VECTOR_MAP_H

#include <vector>

#include <lemon/map_iterator.h>

#include <lemon/map_bits.h>

///\ingroup graphmaps

///\file

///\brief Vector based graph maps.

namespace lemon {

  /// \addtogroup graphmaps

  /// @{

  /** The ArrayMap template class is graph map structure what

   *  automatically updates the map when a key is added to or erased from

   *  the map. This map factory uses the allocators to implement 

   *  the container functionality. This map factory

   *  uses the std::vector to implement the container function.

   *

   *  The template parameter is the MapRegistry that the maps

   *  will belong to and the ValueType.

   * 

   * \todo It should use a faster initialization using the maxNodeId() or

   * maxEdgeId() function of the graph instead of iterating through each

   * edge/node.

   */

  template <typename MapRegistry, typename Value>

  class VectorMap : public MapRegistry::MapBase {

    template <typename MR, typename T> friend class VectorMap;

  public:

    /// The graph type of the maps. 

    typedef typename MapRegistry::Graph Graph;

    /// The key type of the maps.

    typedef typename MapRegistry::KeyType KeyType;

    /// The iterator to iterate on the keys.

    typedef typename MapRegistry::KeyIt KeyIt;

    /// The map type.

    typedef VectorMap Map;

    /// The MapBase of the Map which implements the core regisitry function.

    typedef typename MapRegistry::MapBase MapBase;

  private:

    /// The container type of the map.

    typedef std::vector<Value> Container;	

  public:

    /// The value type of the map.

    typedef Value ValueType;

    /// The reference type of the map;

    typedef typename Container::reference ReferenceType;

    /// The pointer type of the map;

    typedef typename Container::pointer PointerType;

    /// The const value type of the map.

    typedef const Value ConstValueType;

    /// The const reference type of the map;

    typedef typename Container::const_reference ConstReferenceType;

    /// The pointer type of the map;

    typedef typename Container::const_pointer ConstPointerType;

    /** Graph and Registry initialized map constructor.

     */

    VectorMap(const Graph& g, MapRegistry& r) 

      : MapBase(g, r), container(KeyInfo<Graph, KeyIt>::maxId(g)+1) {}

    /** Constructor to use default value to initialize the map. 

     */

    VectorMap(const Graph& g, MapRegistry& r, const Value& v) 

      : MapBase(g, r), container(KeyInfo<Graph, KeyIt>::maxId(g)+1, v) {}

    /** Assign operator to copy a map of an other map type.

     */

    template <typename TT>

    VectorMap(const VectorMap<MapRegistry, TT>& c) 

      : MapBase(c), container(c.container.size()) {

      for (KeyIt it(*MapBase::getGraph()); it != INVALID; ++it) {

	int id = KeyInfo<Graph, KeyIt>::id(*MapBase::getGraph(), it);

	container[id] = c.container[id];

      }

    }

    /** Assign operator to copy a map of an other map type.

     */

    template <typename TT>

    VectorMap& operator=(const VectorMap<MapRegistry, TT>& c) {

      if (MapBase::getGraph() != c.getGraph()) {

	MapBase::operator=(c);

	container.resize(c.container.size());

      }

      for (KeyIt it(*MapBase::getGraph()); it != INVALID; ++it) {

	int id = KeyInfo<Graph, KeyIt>::id(*MapBase::getGraph(), it);

	container[id] = c.container[id];

      }

      return *this;

    }

    /**

     * The subscript operator. The map can be subscripted by the

     * actual keys of the graph. 

     */

    ReferenceType operator[](const KeyType& key) {

      int id = KeyInfo<Graph, KeyIt>::id(*MapBase::getGraph(), key);

      return container[id];

    } 

    /**

     * The const subscript operator. The map can be subscripted by the

     * actual keys of the graph. 

     */

    ConstReferenceType operator[](const KeyType& key) const {

      int id = KeyInfo<Graph, KeyIt>::id(*MapBase::getGraph(), key);

      return container[id];

    }

    /** Setter function of the map. Equivalent with map[key] = val.

     *  This is a compatibility feature with the not dereferable maps.

     */

    void set(const KeyType& key, const ValueType& val) {

      int id = KeyInfo<Graph, KeyIt>::id(*MapBase::getGraph(), key);

      container[id] = val;

    }

    /** Add a new key to the map. It called by the map registry.

     */

    void add(const KeyType& key) {

      int id = KeyInfo<Graph, KeyIt>::id(*MapBase::getGraph(), key);

      if (id >= (int)container.size()) {

	container.resize(id + 1);

      }

    }

    /** Erase a key from the map. It called by the map registry.

     */

    void erase(const KeyType& key) {}

    /** Clear the data structure.

     */

    void clear() { 

      container.clear();

    }

    /// The stl compatible pair iterator of the map.

    typedef MapIterator<VectorMap> Iterator;

    /// The stl compatible const pair iterator of the map.

    typedef MapConstIterator<VectorMap> ConstIterator;

    /** Returns the begin iterator of the map.

     */

    Iterator begin() {

      return Iterator(*this, KeyIt(*MapBase::getGraph()));

    }

    /** Returns the end iterator of the map.

     */

    Iterator end() {

      return Iterator(*this, INVALID);

    }

    /** Returns the begin ConstIterator of the map.

     */

    ConstIterator begin() const {

      return ConstIterator(*this, KeyIt(*MapBase::getGraph()));

    }

    /** Returns the end const_iterator of the map.

     */

    ConstIterator end() const {

      return ConstIterator(*this, INVALID);

    }

    /// The KeySet of the Map.

    typedef MapConstKeySet<VectorMap> ConstKeySet;

    /// KeySet getter function.

    ConstKeySet keySet() const {

      return ConstKeySet(*this); 

    }

    /// The ConstValueSet of the Map.

    typedef MapConstValueSet<VectorMap> ConstValueSet;

    /// ConstValueSet getter function.

    ConstValueSet valueSet() const {

      return ConstValueSet(*this);

    }

    /// The ValueSet of the Map.

    typedef MapValueSet<VectorMap> ValueSet;

    /// ValueSet getter function.

    ValueSet valueSet() {

      return ValueSet(*this);

    }

  private:

    Container container;

  public:

    // STL  compatibility typedefs.

    typedef Iterator iterator;

    typedef ConstIterator const_iterator;

    typedef typename Iterator::PairValueType value_type;

    typedef typename Iterator::KeyType key_type;

    typedef typename Iterator::ValueType data_type;

    typedef typename Iterator::PairReferenceType reference;

    typedef typename Iterator::PairPointerType pointer;

    typedef typename ConstIterator::PairReferenceType const_reference;

    typedef typename ConstIterator::PairPointerType const_pointer;

    typedef int difference_type;		

  };

  /// @}

}

#endif