/* -*- mode: C++; indent-tabs-mode: nil; -*-

  *

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

  *

  * Copyright (C) 2003-2008

  * 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_ADAPTOR_EXTENDER_H

 #define LEMON_BITS_GRAPH_ADAPTOR_EXTENDER_H

 #include <lemon/core.h>

 #include <lemon/error.h>

 #include <lemon/bits/default_map.h>

 namespace lemon {

   template <typename _Digraph>

   class DigraphAdaptorExtender : public _Digraph {

   public:

     typedef _Digraph Parent;

     typedef _Digraph Digraph;

     typedef DigraphAdaptorExtender Adaptor;

     // Base extensions

     typedef typename Parent::Node Node;

     typedef typename Parent::Arc Arc;

     int maxId(Node) const {

       return Parent::maxNodeId();

     }

     int maxId(Arc) const {

       return Parent::maxArcId();

     }

     Node fromId(int id, Node) const {

       return Parent::nodeFromId(id);

     }

     Arc fromId(int id, Arc) const {

       return Parent::arcFromId(id);

     }

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

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

         return Parent::target(e);

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

         return Parent::source(e);

       else

         return INVALID;

     }

     class NodeIt : public Node {

       const Adaptor* _adaptor;

     public:

       NodeIt() {}

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

       explicit NodeIt(const Adaptor& adaptor) : _adaptor(&adaptor) {

         _adaptor->first(static_cast<Node&>(*this));

       }

       NodeIt(const Adaptor& adaptor, const Node& node)

         : Node(node), _adaptor(&adaptor) {}

       NodeIt& operator++() {

         _adaptor->next(*this);

         return *this;

       }

     };

     class ArcIt : public Arc {

       const Adaptor* _adaptor;

     public:

       ArcIt() { }

       ArcIt(Invalid i) : Arc(i) { }

       explicit ArcIt(const Adaptor& adaptor) : _adaptor(&adaptor) {

         _adaptor->first(static_cast<Arc&>(*this));

       }

       ArcIt(const Adaptor& adaptor, const Arc& e) :

         Arc(e), _adaptor(&adaptor) { }

       ArcIt& operator++() {

         _adaptor->next(*this);

         return *this;

       }

     };

     class OutArcIt : public Arc {

       const Adaptor* _adaptor;

     public:

       OutArcIt() { }

       OutArcIt(Invalid i) : Arc(i) { }

       OutArcIt(const Adaptor& adaptor, const Node& node)

         : _adaptor(&adaptor) {

         _adaptor->firstOut(*this, node);

       }

       OutArcIt(const Adaptor& adaptor, const Arc& arc)

         : Arc(arc), _adaptor(&adaptor) {}

       OutArcIt& operator++() {

         _adaptor->nextOut(*this);

         return *this;

       }

     };

     class InArcIt : public Arc {

       const Adaptor* _adaptor;

     public:

       InArcIt() { }

       InArcIt(Invalid i) : Arc(i) { }

       InArcIt(const Adaptor& adaptor, const Node& node)

         : _adaptor(&adaptor) {

         _adaptor->firstIn(*this, node);

       }

       InArcIt(const Adaptor& adaptor, const Arc& arc) :

         Arc(arc), _adaptor(&adaptor) {}

       InArcIt& operator++() {

         _adaptor->nextIn(*this);

         return *this;

       }

     };

     Node baseNode(const OutArcIt &e) const {

       return Parent::source(e);

     }

     Node runningNode(const OutArcIt &e) const {

       return Parent::target(e);

     }

     Node baseNode(const InArcIt &e) const {

       return Parent::target(e);

     }

     Node runningNode(const InArcIt &e) const {

       return Parent::source(e);

     }

   };

   /// \ingroup digraphbits

   ///

   /// \brief Extender for the GraphAdaptors

   template <typename _Graph>

   class GraphAdaptorExtender : public _Graph {

   public:

     typedef _Graph Parent;

     typedef _Graph Graph;

     typedef GraphAdaptorExtender Adaptor;

     typedef typename Parent::Node Node;

     typedef typename Parent::Arc Arc;

     typedef typename Parent::Edge Edge;

     // Graph extension

     int maxId(Node) const {

       return Parent::maxNodeId();

     }

     int maxId(Arc) const {

       return Parent::maxArcId();

     }

     int maxId(Edge) const {

       return Parent::maxEdgeId();

     }

     Node fromId(int id, Node) const {

       return Parent::nodeFromId(id);

     }

     Arc fromId(int id, Arc) const {

       return Parent::arcFromId(id);

     }

     Edge fromId(int id, Edge) const {

       return Parent::edgeFromId(id);

     }

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

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

         return Parent::v(e);

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

         return Parent::u(e);

       else

         return INVALID;

     }

     Arc oppositeArc(const Arc &a) const {

       return Parent::direct(a, !Parent::direction(a));

     }

     using Parent::direct;

     Arc direct(const Edge &e, const Node &s) const {

       return Parent::direct(e, Parent::u(e) == s);

     }

     class NodeIt : public Node {

       const Adaptor* _adaptor;

     public:

       NodeIt() {}

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

       explicit NodeIt(const Adaptor& adaptor) : _adaptor(&adaptor) {

         _adaptor->first(static_cast<Node&>(*this));

       }

       NodeIt(const Adaptor& adaptor, const Node& node)

         : Node(node), _adaptor(&adaptor) {}

       NodeIt& operator++() {

         _adaptor->next(*this);

         return *this;

       }

     };

     class ArcIt : public Arc {

       const Adaptor* _adaptor;

     public:

       ArcIt() { }

       ArcIt(Invalid i) : Arc(i) { }

       explicit ArcIt(const Adaptor& adaptor) : _adaptor(&adaptor) {

         _adaptor->first(static_cast<Arc&>(*this));

       }

       ArcIt(const Adaptor& adaptor, const Arc& e) :

         Arc(e), _adaptor(&adaptor) { }

       ArcIt& operator++() {

         _adaptor->next(*this);

         return *this;

       }

     };

     class OutArcIt : public Arc {

       const Adaptor* _adaptor;

     public:

       OutArcIt() { }

       OutArcIt(Invalid i) : Arc(i) { }

       OutArcIt(const Adaptor& adaptor, const Node& node)

         : _adaptor(&adaptor) {

         _adaptor->firstOut(*this, node);

       }

       OutArcIt(const Adaptor& adaptor, const Arc& arc)

         : Arc(arc), _adaptor(&adaptor) {}

       OutArcIt& operator++() {

         _adaptor->nextOut(*this);

         return *this;

       }

     };

     class InArcIt : public Arc {

       const Adaptor* _adaptor;

     public:

       InArcIt() { }

       InArcIt(Invalid i) : Arc(i) { }

       InArcIt(const Adaptor& adaptor, const Node& node)

         : _adaptor(&adaptor) {

         _adaptor->firstIn(*this, node);

       }

       InArcIt(const Adaptor& adaptor, const Arc& arc) :

         Arc(arc), _adaptor(&adaptor) {}

       InArcIt& operator++() {

         _adaptor->nextIn(*this);

         return *this;

       }

     };

     class EdgeIt : public Parent::Edge {

       const Adaptor* _adaptor;

     public:

       EdgeIt() { }

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

       explicit EdgeIt(const Adaptor& adaptor) : _adaptor(&adaptor) {

         _adaptor->first(static_cast<Edge&>(*this));

       }

       EdgeIt(const Adaptor& adaptor, const Edge& e) :

         Edge(e), _adaptor(&adaptor) { }

       EdgeIt& operator++() {

         _adaptor->next(*this);

         return *this;

       }

     };

     class IncEdgeIt : public Edge {

       friend class GraphAdaptorExtender;

       const Adaptor* _adaptor;

       bool direction;

     public:

       IncEdgeIt() { }

       IncEdgeIt(Invalid i) : Edge(i), direction(false) { }

       IncEdgeIt(const Adaptor& adaptor, const Node &n) : _adaptor(&adaptor) {

         _adaptor->firstInc(static_cast<Edge&>(*this), direction, n);

       }

       IncEdgeIt(const Adaptor& adaptor, const Edge &e, const Node &n)

         : _adaptor(&adaptor), Edge(e) {

         direction = (_adaptor->u(e) == n);

       }

       IncEdgeIt& operator++() {

         _adaptor->nextInc(*this, direction);

         return *this;

       }

     };

     Node baseNode(const OutArcIt &a) const {

       return Parent::source(a);

     }

     Node runningNode(const OutArcIt &a) const {

       return Parent::target(a);

     }

     Node baseNode(const InArcIt &a) const {

       return Parent::target(a);

     }

     Node runningNode(const InArcIt &a) const {

       return Parent::source(a);

     }

     Node baseNode(const IncEdgeIt &e) const {

       return e.direction ? Parent::u(e) : Parent::v(e);

     }

     Node runningNode(const IncEdgeIt &e) const {

       return e.direction ? Parent::v(e) : Parent::u(e);

     }

   };

 }

 #endif