/* -*- C++ -*-

  * src/lemon/lp_glpk.h - Part of LEMON, a generic C++ optimization library

  *

  * Copyright (C) 2005 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 gen_opt_group

 #include <lemon/lp_base.h>

 extern "C" {

 #include <glpk.h>

 }

 namespace lemon {

   /// \brief Wrapper for GLPK solver

   /// 

   /// This class implements an interface for GLPK.

   ///\ingroup gen_opt_group

   class LpGlpk : public LpSolverBase {

   protected:

     LPX* lp;

   public:

     typedef LpSolverBase Parent;

     LpGlpk();

     ~LpGlpk();

   protected:

     virtual LpSolverBase &_newLp();

     virtual LpSolverBase &_copyLp();

     virtual int _addCol();

     virtual int _addRow();

     virtual void _setRowCoeffs(int i, 

 			       int length,

                                const int   * indices, 

                                const Value   * values );

     virtual void _setColCoeffs(int i, 

 			       int length,

                                const int   * indices, 

                                const Value   * values);

     virtual void _setColLowerBound(int i, Value value);

     virtual void _setColUpperBound(int i, Value value);

     virtual void _setRowLowerBound(int i, Value value);

     virtual void _setRowUpperBound(int i, Value value);

     virtual void _setObjCoeff(int i, Value obj_coef);

     virtual void _setObj(int length,

                          int  const * indices, 

                          Value  const * values ) = 0;

     ///\e

     ///\todo It should be clarified

     ///

     virtual SolveExitStatus _solve();

     virtual Value _getPrimal(int i);

     virtual Value _getPrimalValue();

     ///\e

     ///\todo It should be clarified

     ///

     virtual SolutionStatus _getPrimalStatus();

     virtual void _setMax();

     virtual void _setMin();

   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);

   };

 } //END OF NAMESPACE LEMON

 #endif //LEMON_LP_GLPK_H