/* -*- C++ -*-

  *

  * 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_LP_GLPK_H

 #define LEMON_LP_GLPK_H

 ///\file

 ///\brief Header of the LEMON-GLPK lp solver interface.

 ///\ingroup lp_group

 #include <lemon/lp_base.h>

 extern "C" {

 #include <glpk.h>

 }

 namespace lemon {

   /// \brief Interface for the GLPK LP solver

   /// 

   /// This class implements an interface for the GLPK LP solver.

   ///\ingroup lp_group

   class LpGlpk : virtual public LpSolverBase {

   protected:

     LPX* lp;

     bool solved;

   public:

     typedef LpSolverBase Parent;

     LpGlpk();

     LpGlpk(const LpGlpk &);

     ~LpGlpk();

   protected:

     virtual LpSolverBase* _newLp();

     virtual LpSolverBase* _copyLp();

     virtual int _addCol();

     virtual int _addRow();

     virtual void _eraseCol(int i);

     virtual void _eraseRow(int i);

     virtual void _getColName(int col, std::string & name) const;

     virtual void _setColName(int col, const std::string & name);

     virtual int _colByName(const std::string& name) const;

     virtual void _setRowCoeffs(int i, ConstRowIterator b, ConstRowIterator e);

     virtual void _getRowCoeffs(int i, RowIterator b) const;

     virtual void _setColCoeffs(int i, ConstColIterator b, ConstColIterator e);

     virtual void _getColCoeffs(int i, ColIterator b) const;

     virtual void _setCoeff(int row, int col, Value value);

     virtual Value _getCoeff(int row, int col) const;

     virtual void _setColLowerBound(int i, Value value);

     virtual Value _getColLowerBound(int i) const;

     virtual void _setColUpperBound(int i, Value value);

     virtual Value _getColUpperBound(int i) const;

     virtual void _setRowBounds(int i, Value lower, Value upper);

     virtual void _getRowBounds(int i, Value &lb, Value &ub) const;

     virtual void _setObjCoeff(int i, Value obj_coef);

     virtual Value _getObjCoeff(int i) const;

     virtual void _clearObj();

     ///\e

     ///\todo It should be clarified

     ///

     virtual SolveExitStatus _solve();

     virtual Value _getPrimal(int i) const;

     virtual Value _getDual(int i) const;

     virtual Value _getPrimalValue() const;

     virtual bool _isBasicCol(int i) const;

     ///\e

     ///\todo It should be clarified

     ///

     virtual SolutionStatus _getPrimalStatus() const;

     virtual SolutionStatus _getDualStatus() const;

     virtual ProblemTypes _getProblemType() const;

     virtual void _setMax();

     virtual void _setMin();

     virtual bool _isMax() const;

   public:

     ///Set the verbosity of the messages

     ///Set the verbosity of the messages

     ///

     ///\param m is the level of the messages output by the solver routines.

     ///The possible values are:

     ///- 0 --- no output (default value)

     ///- 1 --- error messages only

     ///- 2 --- normal output

     ///- 3 --- full output (includes informational messages)

     void messageLevel(int m);

     ///Turns on or off the presolver

     ///Turns on (\c b is \c true) or off (\c b is \c false) the presolver

     ///

     ///The presolver is off by default.

     void presolver(bool b);

     ///Pointer to the underlying GLPK data structure.

     LPX *lpx() {return lp;}

     ///Returns the constraint identifier understood by GLPK.

     int lpxRow(Row r) { return _lpId(r); }

     ///Returns the variable identifier understood by GLPK.

     int lpxCol(Col c) { return _lpId(c); }

   };

 } //END OF NAMESPACE LEMON

 #endif //LEMON_LP_GLPK_H