/* -*- 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 <algorithm>

 #include <lemon/alteration_observer_registry.h>

 ///\ingroup graphmaps

 ///\file

 ///\brief Vector based graph maps.

 namespace lemon {

   /// \addtogroup graphmaps

   /// @{

   /// The VectorMap 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.

   ///

   /// \param Registry The AlterationObserverRegistry that will notify this map.

   /// \param IdMap The IdMap type of the graph items.

   /// \param Value The value type of the map.

   /// 

   /// \author Balazs Dezso

   template <typename _Graph, 

 	    typename _Item,

 	    typename _IdMap,

 	    typename _Value>

   class VectorMap : public AlterationObserverRegistry<_Item>::ObserverBase {

   public:

     /// The graph type of the map. 

     typedef _Graph Graph;

     /// The key type of the map.

     typedef _Item KeyType;

     /// The id map type of the map.

     typedef _IdMap IdMap;

     /// The registry type of the map.

     typedef AlterationObserverRegistry<_Item> Registry;

     /// The value type of the map.

     typedef _Value Value;

     /// The map type.

     typedef VectorMap Map;

     /// The base class of the map.

     typedef typename Registry::ObserverBase Parent;

   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;

     /// Constructor to attach the new map into the registry.

     /// It construates a map and attachs it into the registry.

     /// It adds all the items of the graph to the map.

     VectorMap(const Graph& _g, Registry& _r) : graph(&_g) {

       attach(_r);

       build();

     }

     /// Constructor uses given value to initialize the map. 

     /// It construates a map uses a given value to initialize the map. 

     /// It adds all the items of the graph to the map.

     VectorMap(const Graph& g, Registry& r, const Value& v) : graph(&g) { 

       attach(r);

       container.resize(IdMap(*graph).maxId() + 1, v);

     }

     VectorMap(const VectorMap& copy) : graph(copy.getGraph()) {

       if (copy.attached()) {

 	attach(*copy.getRegistry());

 	container = copy.container;

       }

     }

     /** Assign operator to copy a map of the same map type.

      */

     VectorMap& operator=(const VectorMap& copy) {

       if (&copy == this) return *this;

       if (graph != copy.graph) {

 	if (attached()) {

 	  detach();

 	}

 	if (copy.attached()) {

 	  attach(*copy.getRegistry());

 	}

       }

       container = copy.container;

       return *this;

     }

     virtual ~VectorMap() {

       if (attached()) {

 	detach();

       }

     }

     const Graph* getGraph() const {

       return graph;

     }

     /// The subcript operator.

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

     /// actual items of the graph. 

     ReferenceType operator[](const KeyType& key) {

       return container[IdMap(*graph)[key]];

     } 

     /// The const subcript operator.

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

     /// actual items of the graph. 

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

       return container[IdMap(*graph)[key]];

     }

     /// The setter function of the map.

     /// It the same as operator[](key) = value expression.

     ///

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

       (*this)[key] = value;

     }

     /// Adds a new key to the map.

     /// It adds a new key to the map. It called by the observer registry

     /// and it overrides the add() member function of the observer base.

     void add(const KeyType& key) {

       int id = IdMap(*graph)[key];

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

 	container.resize(id + 1);

       }

     }

     /// Erases a key from the map.

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

     /// and it overrides the erase() member function of the observer base.     

     void erase(const KeyType&) {}

     /// Buildes the map.

     /// It buildes the map. It called by the observer registry

     /// and it overrides the build() member function of the observer base.

     void build() { 

       container.resize(IdMap(*graph).maxId() + 1);

     }

     /// Clear the map.

     /// It erase all items from the map. It called by the observer registry

     /// and it overrides the clear() member function of the observer base.     

     void clear() { 

       container.clear();

     }

   private:

     Container container;

     const Graph *graph;

   };

   template <typename _Base> 

   class VectorMappableGraphExtender : public _Base {

   public:

     typedef VectorMappableGraphExtender<_Base> Graph;

     typedef _Base Parent;

     typedef typename Parent::Node Node;

     typedef typename Parent::NodeIt NodeIt;

     typedef typename Parent::NodeIdMap NodeIdMap;

     typedef typename Parent::NodeObserverRegistry NodeObserverRegistry;

     typedef typename Parent::Edge Edge;

     typedef typename Parent::EdgeIt EdgeIt;

     typedef typename Parent::EdgeIdMap EdgeIdMap;

     typedef typename Parent::EdgeObserverRegistry EdgeObserverRegistry;

     template <typename _Value>

     class NodeMap : public VectorMap<Graph, Node, NodeIdMap, _Value> {

     public:

       typedef VectorMappableGraphExtender<_Base> Graph;

       typedef typename Graph::Node Node;

       typedef typename Graph::NodeIdMap NodeIdMap;

       typedef VectorMap<Graph, Node, NodeIdMap, _Value> Parent;

       typedef typename Parent::Graph Graph;

       typedef typename Parent::Value Value;

       NodeMap(const Graph& g) 

 	: Parent(g, g.getNodeObserverRegistry()) {}

       NodeMap(const Graph& g, const Value& v) 

 	: Parent(g, g.getNodeObserverRegistry(), v) {}

     };

     template <typename _Value>

     class EdgeMap : public VectorMap<Graph, Edge, EdgeIdMap, _Value> {

     public:

       typedef VectorMappableGraphExtender<_Base> Graph;

       typedef typename Graph::Edge Edge;

       typedef typename Graph::EdgeIdMap EdgeIdMap;

       typedef VectorMap<Graph, Edge, EdgeIdMap, _Value> Parent;

       typedef typename Parent::Graph Graph;

       typedef typename Parent::Value Value;

       EdgeMap(const Graph& g) 

 	: Parent(g, g.getEdgeObserverRegistry()) {}

       EdgeMap(const Graph& g, const Value& v) 

 	: Parent(g, g.getEdgeObserverRegistry(), v) {}

     };

   };

   /// @}

 }

 #endif