/* -*- C++ -*-

  *

  * This file is a part of LEMON, a generic C++ optimization library

  *

  * Copyright (C) 2003-2006

  * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport

  * (Egervary Research Group on Combinatorial Optimization, 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_BITS_GRAPH_EXTENDER_H

 #define LEMON_BITS_GRAPH_EXTENDER_H

 #include <lemon/bits/invalid.h>

 #include <lemon/bits/map_extender.h>

 #include <lemon/bits/default_map.h>

 ///\ingroup graphbits

 ///\file

 ///\brief Extenders for the graph types

 namespace lemon {

   /// \ingroup graphbits

   ///

   /// \brief Extender for the Graphs

   template <typename Base>

   class GraphExtender : public Base {

   public:

     typedef Base Parent;

     typedef GraphExtender Graph;

     // Base extensions

     typedef typename Parent::Node Node;

     typedef typename Parent::Edge Edge;

     int maxId(Node) const {

       return Parent::maxNodeId();

     }

     int maxId(Edge) const {

       return Parent::maxEdgeId();

     }

     Node fromId(int id, Node) const {

       return Parent::nodeFromId(id);

     }

     Edge fromId(int id, Edge) const {

       return Parent::edgeFromId(id);

     }

     Node oppositeNode(const Node &n, const Edge &e) const {

       if (n == Parent::source(e))

 	return Parent::target(e);

       else if(n==Parent::target(e))

 	return Parent::source(e);

       else

 	return INVALID;

     }

     // Alterable extension

     typedef AlterationNotifier<GraphExtender, Node> NodeNotifier;

     typedef AlterationNotifier<GraphExtender, Edge> EdgeNotifier;

   protected:

     mutable NodeNotifier node_notifier;

     mutable EdgeNotifier edge_notifier;

   public:

     NodeNotifier& getNotifier(Node) const {

       return node_notifier;

     }

     EdgeNotifier& getNotifier(Edge) const {

       return edge_notifier;

     }

     class NodeIt : public Node { 

       const Graph* graph;

     public:

       NodeIt() {}

       NodeIt(Invalid i) : Node(i) { }

       explicit NodeIt(const Graph& _graph) : graph(&_graph) {

 	_graph.first(static_cast<Node&>(*this));

       }

       NodeIt(const Graph& _graph, const Node& node) 

 	: Node(node), graph(&_graph) {}

       NodeIt& operator++() { 

 	graph->next(*this);

 	return *this; 

       }

     };

     class EdgeIt : public Edge { 

       const Graph* graph;

     public:

       EdgeIt() { }

       EdgeIt(Invalid i) : Edge(i) { }

       explicit EdgeIt(const Graph& _graph) : graph(&_graph) {

 	_graph.first(static_cast<Edge&>(*this));

       }

       EdgeIt(const Graph& _graph, const Edge& e) : 

 	Edge(e), graph(&_graph) { }

       EdgeIt& operator++() { 

 	graph->next(*this);

 	return *this; 

       }

     };

     class OutEdgeIt : public Edge { 

       const Graph* graph;

     public:

       OutEdgeIt() { }

       OutEdgeIt(Invalid i) : Edge(i) { }

       OutEdgeIt(const Graph& _graph, const Node& node) 

 	: graph(&_graph) {

 	_graph.firstOut(*this, node);

       }

       OutEdgeIt(const Graph& _graph, const Edge& edge) 

 	: Edge(edge), graph(&_graph) {}

       OutEdgeIt& operator++() { 

 	graph->nextOut(*this);

 	return *this; 

       }

     };

     class InEdgeIt : public Edge { 

       const Graph* graph;

     public:

       InEdgeIt() { }

       InEdgeIt(Invalid i) : Edge(i) { }

       InEdgeIt(const Graph& _graph, const Node& node) 

 	: graph(&_graph) {

 	_graph.firstIn(*this, node);

       }

       InEdgeIt(const Graph& _graph, const Edge& edge) : 

 	Edge(edge), graph(&_graph) {}

       InEdgeIt& operator++() { 

 	graph->nextIn(*this);

 	return *this; 

       }

     };

     /// \brief Base node of the iterator

     ///

     /// Returns the base node (i.e. the source in this case) of the iterator

     Node baseNode(const OutEdgeIt &e) const {

       return Parent::source(e);

     }

     /// \brief Running node of the iterator

     ///

     /// Returns the running node (i.e. the target in this case) of the

     /// iterator

     Node runningNode(const OutEdgeIt &e) const {

       return Parent::target(e);

     }

     /// \brief Base node of the iterator

     ///

     /// Returns the base node (i.e. the target in this case) of the iterator

     Node baseNode(const InEdgeIt &e) const {

       return Parent::target(e);

     }

     /// \brief Running node of the iterator

     ///

     /// Returns the running node (i.e. the source in this case) of the

     /// iterator

     Node runningNode(const InEdgeIt &e) const {

       return Parent::source(e);

     }

     template <typename _Value>

     class NodeMap 

       : public MapExtender<DefaultMap<Graph, Node, _Value> > {

     public:

       typedef GraphExtender Graph;

       typedef MapExtender<DefaultMap<Graph, Node, _Value> > Parent;

       explicit NodeMap(const Graph& graph) 

 	: Parent(graph) {}

       NodeMap(const Graph& graph, const _Value& value) 

 	: Parent(graph, value) {}

       NodeMap& operator=(const NodeMap& cmap) {

 	return operator=<NodeMap>(cmap);

       }

       template <typename CMap>

       NodeMap& operator=(const CMap& cmap) {

         Parent::operator=(cmap);

 	return *this;

       }

     };

     template <typename _Value>

     class EdgeMap 

       : public MapExtender<DefaultMap<Graph, Edge, _Value> > {

     public:

       typedef GraphExtender Graph;

       typedef MapExtender<DefaultMap<Graph, Edge, _Value> > Parent;

       explicit EdgeMap(const Graph& graph) 

 	: Parent(graph) {}

       EdgeMap(const Graph& graph, const _Value& value) 

 	: Parent(graph, value) {}

       EdgeMap& operator=(const EdgeMap& cmap) {

 	return operator=<EdgeMap>(cmap);

       }

       template <typename CMap>

       EdgeMap& operator=(const CMap& cmap) {

         Parent::operator=(cmap);

 	return *this;

       }

     };

     Node addNode() {

       Node node = Parent::addNode();

       getNotifier(Node()).add(node);

       return node;

     }

     Edge addEdge(const Node& from, const Node& to) {

       Edge edge = Parent::addEdge(from, to);

       getNotifier(Edge()).add(edge);

       return edge;

     }

     void clear() {

       getNotifier(Edge()).clear();

       getNotifier(Node()).clear();

       Parent::clear();

     }

     void erase(const Node& node) {

       Edge edge;

       Parent::firstOut(edge, node);

       while (edge != INVALID ) {

 	erase(edge);

 	Parent::firstOut(edge, node);

       } 

       Parent::firstIn(edge, node);

       while (edge != INVALID ) {

 	erase(edge);

 	Parent::firstIn(edge, node);

       }

       getNotifier(Node()).erase(node);

       Parent::erase(node);

     }

     void erase(const Edge& edge) {

       getNotifier(Edge()).erase(edge);

       Parent::erase(edge);

     }

     GraphExtender() {

       node_notifier.setContainer(*this);

       edge_notifier.setContainer(*this);

     } 

     ~GraphExtender() {

       edge_notifier.clear();

       node_notifier.clear();

     }

   };

 }

 #endif