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

  *

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

  *

  * Copyright (C) 2003-2009

  * 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_CPLEX_H

 #define LEMON_CPLEX_H

 ///\file

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

 #include <lemon/lp_base.h>

 struct cpxenv;

 struct cpxlp;

 namespace lemon {

   /// \brief Reference counted wrapper around cpxenv pointer

   ///

   /// The cplex uses environment object which is responsible for

   /// checking the proper license usage. This class provides a simple

   /// interface for share the environment object between different

   /// problems.

   class CplexEnv {

     friend class CplexBase;

   private:

     cpxenv* _env;

     mutable int* _cnt;

   public:

     /// \brief This exception is thrown when the license check is not

     /// sufficient

     class LicenseError : public Exception {

       friend class CplexEnv;

     private:

       LicenseError(int status);

       char _message[510];

     public:

       /// The short error message

       virtual const char* what() const throw() {

         return _message;

       }

     };

     /// Constructor

     CplexEnv();

     /// Shallow copy constructor

     CplexEnv(const CplexEnv&);

     /// Shallow assignement

     CplexEnv& operator=(const CplexEnv&);

     /// Destructor

     virtual ~CplexEnv();

   protected:

     cpxenv* cplexEnv() { return _env; }

     const cpxenv* cplexEnv() const { return _env; }

   };

   /// \brief Base interface for the CPLEX LP and MIP solver

   ///

   /// This class implements the common interface of the CPLEX LP and

   /// MIP solvers.

   /// \ingroup lp_group

   class CplexBase : virtual public LpBase {

   protected:

     CplexEnv _env;

     cpxlp* _prob;

     CplexBase();

     CplexBase(const CplexEnv&);

     CplexBase(const CplexBase &);

     virtual ~CplexBase();

     virtual int _addCol();

     virtual int _addRow();

     virtual int _addRow(Value l, ExprIterator b, ExprIterator e, Value u);

     virtual void _eraseCol(int i);

     virtual void _eraseRow(int i);

     virtual void _eraseColId(int i);

     virtual void _eraseRowId(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 _getRowName(int row, std::string& name) const;

     virtual void _setRowName(int row, const std::string& name);

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

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

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

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

     virtual void _getColCoeffs(int i, InsertIterator 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;

   private:

     void _set_row_bounds(int i, Value lb, Value ub);

   protected:

     virtual void _setRowLowerBound(int i, Value value);

     virtual Value _getRowLowerBound(int i) const;

     virtual void _setRowUpperBound(int i, Value value);

     virtual Value _getRowUpperBound(int i) const;

     virtual void _setObjCoeffs(ExprIterator b, ExprIterator e);

     virtual void _getObjCoeffs(InsertIterator b) const;

     virtual void _setObjCoeff(int i, Value obj_coef);

     virtual Value _getObjCoeff(int i) const;

     virtual void _setSense(Sense sense);

     virtual Sense _getSense() const;

     virtual void _clear();

     virtual void _messageLevel(MessageLevel level);

     void _applyMessageLevel();

     bool _message_enabled;

     void _write(std::string file, std::string format) const;

   public:

     /// Returns the used \c CplexEnv instance

     const CplexEnv& env() const { return _env; }

     /// \brief Returns the const cpxenv pointer

     ///

     /// \note The cpxenv might be destructed with the solver.

     const cpxenv* cplexEnv() const { return _env.cplexEnv(); }

     /// \brief Returns the const cpxenv pointer

     ///

     /// \note The cpxenv might be destructed with the solver.

     cpxenv* cplexEnv() { return _env.cplexEnv(); }

     /// Returns the cplex problem object

     cpxlp* cplexLp() { return _prob; }

     /// Returns the cplex problem object

     const cpxlp* cplexLp() const { return _prob; }

 #ifdef DOXYGEN

     /// Write the problem or the solution to a file in the given format

     /// This function writes the problem or the solution

     /// to a file in the given format.

     /// Trying to write in an unsupported format will trigger

     /// \ref lemon::LpBase::UnsupportedFormatError "UnsupportedFormatError".

     /// \param file The file path

     /// \param format The output file format.

     /// Supportted formats are "MPS", "LP" and "SOL".

     void write(std::string file, std::string format = "MPS") const {}

 #endif

   };

   /// \brief Interface for the CPLEX LP solver

   ///

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

   ///\ingroup lp_group

   class CplexLp : public LpSolver, public CplexBase {

   public:

     /// \e

     CplexLp();

     /// \e

     CplexLp(const CplexEnv&);

     /// \e

     CplexLp(const CplexLp&);

     /// \e

     virtual ~CplexLp();

     /// \e

     virtual CplexLp* cloneSolver() const;

     /// \e

     virtual CplexLp* newSolver() const;

   private:

     // these values cannot retrieved element by element

     mutable std::vector<int> _col_status;

     mutable std::vector<int> _row_status;

     mutable std::vector<Value> _primal_ray;

     mutable std::vector<Value> _dual_ray;

     void _clear_temporals();

     SolveExitStatus convertStatus(int status);

   protected:

     virtual const char* _solverName() const;

     virtual SolveExitStatus _solve();

     virtual Value _getPrimal(int i) const;

     virtual Value _getDual(int i) const;

     virtual Value _getPrimalValue() const;

     virtual VarStatus _getColStatus(int i) const;

     virtual VarStatus _getRowStatus(int i) const;

     virtual Value _getPrimalRay(int i) const;

     virtual Value _getDualRay(int i) const;

     virtual ProblemType _getPrimalType() const;

     virtual ProblemType _getDualType() const;

   public:

     /// Solve with primal simplex method

     SolveExitStatus solvePrimal();

     /// Solve with dual simplex method

     SolveExitStatus solveDual();

     /// Solve with barrier method

     SolveExitStatus solveBarrier();

   };

   /// \brief Interface for the CPLEX MIP solver

   ///

   /// This class implements an interface for the CPLEX MIP solver.

   ///\ingroup lp_group

   class CplexMip : public MipSolver, public CplexBase {

   public:

     /// \e

     CplexMip();

     /// \e

     CplexMip(const CplexEnv&);

     /// \e

     CplexMip(const CplexMip&);

     /// \e

     virtual ~CplexMip();

     /// \e

     virtual CplexMip* cloneSolver() const;

     /// \e

     virtual CplexMip* newSolver() const;

   protected:

     virtual const char* _solverName() const;

     virtual ColTypes _getColType(int col) const;

     virtual void _setColType(int col, ColTypes col_type);

     virtual SolveExitStatus _solve();

     virtual ProblemType _getType() const;

     virtual Value _getSol(int i) const;

     virtual Value _getSolValue() const;

   };

 } //END OF NAMESPACE LEMON

 #endif //LEMON_CPLEX_H