/* -*- 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& key) {}

    /// 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