// -*- c++ -*-

 #ifndef VECTOR_MAP_H

 #define VECTOR_MAP_H

 #include <vector>

 #include <hugo/extended_pair.h>

 ///\ingroup graphmapfactory

 ///\file

 ///\brief Vector based graph maps.

 namespace hugo {

   /// \addtogroup graphmapfactory

   /// @{

   /** The VectorMapFactory template class is a factory class

    *  to create maps for the edge and nodes. This map factory

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

    *

    *  The template parameter is the MapRegistry that the maps

    *  will belong to.

    */

   template <typename MapRegistry>

   class VectorMapFactory {

   public:

     /// The graph type of the maps. 

     typedef typename MapRegistry::Graph Graph;

     /// The key type of the maps.

     typedef typename MapRegistry::Key Key;

     /// The iterator to iterate on the keys.

     typedef typename MapRegistry::KeyIt KeyIt;

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

     typedef typename MapRegistry::MapBase MapBase;

     /** The template Map type.

      */

     template <typename V> 

     class Map : public MapBase {

     public:

       /// The value type of the map.

       typedef V Value;

       typedef std::vector<Value> Container;	

       /** Default constructor for the map.

        */

       Map() {}

       /** Graph and Registry initialized map constructor.

        */

       Map(const Graph& g, MapRegistry& r) : MapBase(g, r) {

 	init();

       }

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

        */

       Map(const Graph& g, MapRegistry& r, const Value& v) : MapBase(g, r) {

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

           int id = getGraph()->id(it);

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

 	    container.resize(id + 1);

 	  }

 	  set(it, v);

         }

       }

       /** Constructor to copy a map of an other map type.

        */

       template <typename CMap> Map(const CMap& copy) : MapBase(copy) {

 	if (getGraph()) {

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

 	    int id = getGraph()->id(it);

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

 	      container.resize(id + 1);

 	    }

 	    set(it, copy[it]);

 	  }

 	}

       }

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

        */

       template <typename CMap> Map& operator=(const CMap& copy) {

 	if (getGraph()) {

 	  destroy();

 	} 

 	this->MapBase::operator=(copy);

 	if (getGraph()) {

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

 	    int id = getGraph()->id(it);

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

 	      container.resize(id + 1);

 	    }

 	    set(it, copy[it]);

 	  }

 	}

       }

       /** The destructor of the map.

        */

       virtual ~Map() {

       }

       /**

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

        * actual keys of the graph. 

        */

       typename Container::reference operator[](const Key& key) {

 	int id = getGraph()->id(key);

 	return container[id];

       } 

       /**

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

        * actual keys of the graph. 

        */

       typename Container::const_reference operator[](const Key& key) const {

 	int id = getGraph()->id(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 Key& key, const Value& val) {

 	int id = getGraph()->id(key);

 	container[id] = val;

       }

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

        */

       void add(const Key& key) {

 	int id = getGraph()->id(key);

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

 	  container.resize(id + 1);

 	}

       }

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

        */

       void erase(const Key& key) {}

       /** Clear the data structure.

        */

       void clear() { 

 	container.clear();

       }

       /** Compatible iterator with the stl maps' iterators.

        *  It iterates on pairs of a key and a value.

        */

       class iterator {

 	friend class Map;

 	friend class const_iterator;

       private:

 	/** Private constructor to initalize the the iterators returned

 	 *  by the begin() and end().

 	 */

 	iterator (Map& pmap, const KeyIt& pit) : map(&pmap), it(pit) {}

       public:

 	/** Default constructor. 

 	 */

 	iterator() {}

 	typedef extended_pair<const Key&, const Key&, 

 			      Value&, Value&> Reference;

 	/** Dereference operator for map.

 	 */	 

 	Reference operator*() {

 	  return Reference(it, (*map)[it]);

 	}

 	class Pointer {

 	  friend class iterator;

 	private:

 	  Reference data;

 	  Pointer(const Key& key, Value& val) : data(key, val) {}

 	public:

 	  Reference* operator->() {return &data;}

 	};

 	/** Arrow operator for map.

 	 */	 

 	Pointer operator->() {

 	  return Pointer(it, ((*map)[it])); 

 	}

 	/** The pre increment operator of the map.

 	 */

 	iterator& operator++() { 

 	  ++it; 

 	  return *this; 

 	}

 	/** The post increment operator of the map.

 	 */

 	iterator operator++(int) { 

 	  iterator tmp(it); 

 	  ++it; 

 	  return tmp; 

 	}

 	/** The equality operator of the map.

 	 */

 	bool operator==(const_iterator p_it) {

 	  return p_it.it == it;

 	}

 	/** The not-equality operator of the map.

 	 */

 	bool operator!=(const_iterator p_it) {

 	  return !(*this == p_it);

 	}

       private:

 	Map* map;

 	KeyIt it;

       };

       /** Returns the begin iterator of the map.

        */

       iterator begin() {

 	return iterator(*this, KeyIt(*getGraph()));

       }

       /** Returns the end iterator of the map.

        */

       iterator end() {

 	return iterator(*this, INVALID);

       }

       class const_iterator {

 	friend class Map;

 	friend class iterator;

       private:

 	/** Private constructor to initalize the the iterators returned

 	 *  by the begin() and end().

 	 */

 	const_iterator (const Map& pmap, const KeyIt& pit) 

 	  : map(&pmap), it(pit) {}

       public:

 	/** Default constructor. 

 	 */

 	const_iterator() {}

 	/** Constructor to convert iterator to const_iterator.

 	 */

 	const_iterator(iterator p_it) : map(p_it.map), it(p_it.it) {}

 	typedef extended_pair<const Key&, const Key&, 

 	  const Value&, const Value&> Reference;

 	/** Dereference operator for map.

 	 */	 

 	Reference operator*() {

 	  return Reference(it, (*map)[it]);

 	}

 	class Pointer {

 	  friend class const_iterator;

 	private:

 	  Reference data;

 	  Pointer(const Key& key, const Value& val) : data(key, val) {}

 	public:

 	  Reference* operator->() {return &data;}

 	};

 	/** Arrow operator for map.

 	 */	 

 	Pointer operator->() {

 	  return Pointer(it, ((*map)[it])); 

 	}

 	/** The pre increment operator of the map.

 	 */

 	const_iterator& operator++() { 

 	  ++it; 

 	  return *this; 

 	}

 	/** The post increment operator of the map.

 	 */

 	const_iterator operator++(int) { 

 	  const_iterator tmp(it); 

 	  ++it; 

 	  return tmp; 

 	}

 	/** The equality operator of the map.

 	 */

 	bool operator==(const_iterator p_it) {

 	  return p_it.it == it;

 	}

 	/** The not-equality operator of the map.

 	 */

 	bool operator!=(const_iterator p_it) {

 	  return !(*this == p_it);

 	}

       private:

 	const Map* map;

 	KeyIt it;

       };

       /** Returns the begin const_iterator of the map.

        */

       const_iterator begin() const {

 	return const_iterator(*this, KeyIt(*getGraph()));

       }

       /** Returns the end const_iterator of the map.

        */

       const_iterator end() const {

 	return const_iterator(*this, INVALID);

       }

       private:

       Container container;

     };

   };

   /// @}

 }

 #endif