/* -*- 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_LP_CPLEX_H

#define LEMON_LP_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 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();

  public:

    /// Returns the used \c CplexEnv instance

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

    ///

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

    cpxlp* cplexLp() { return _prob; }

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

  };

  /// \brief Interface for the CPLEX LP solver

  ///

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

  ///\ingroup lp_group

  class LpCplex : public CplexBase, public LpSolver {

  public:

    /// \e

    LpCplex();

    /// \e

    LpCplex(const CplexEnv&);

    /// \e

    LpCplex(const LpCplex&);

    /// \e

    virtual ~LpCplex();

  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 LpCplex* _cloneSolver() const;

    virtual LpCplex* _newSolver() const;

    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 MipCplex : public CplexBase, public MipSolver {

  public:

    /// \e

    MipCplex();

    /// \e

    MipCplex(const CplexEnv&);

    /// \e

    MipCplex(const MipCplex&);

    /// \e

    virtual ~MipCplex();

  protected:

    virtual MipCplex* _cloneSolver() const;

    virtual MipCplex* _newSolver() const;

    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_LP_CPLEX_H