/* -*- 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