OAHandler.h

Go to the documentation of this file.

// 
//     Minotaur -- It's only 1/2 bull
// 
//     (C)opyright 2009 - 2025 The Minotaur Team.
// 
 
#ifndef MINOTAUROAHANDLER_H
#define MINOTAUROAHANDLER_H
 
#include <stack>
 
#include "Handler.h"
#include "Engine.h"
#include "Problem.h"
#include "Function.h"
#include "Timer.h"
 
namespace Minotaur {
 
struct OAStats {
  size_t cuts;      
  size_t nlpS;      
  size_t nlpF;      
  size_t nlpI;      
  size_t nlpIL;     
  size_t milpS;      
  size_t milpIL;     
}; 
 
 
class OAHandler : public Handler {
 
private: 
  EnvPtr env_;
 
  double intTol_;
 
  LoggerPtr logger_;
 
  static const std::string me_;
 
  ProblemPtr minlp_;
 
  Timer *timer_;
 
  std::vector<ConstraintPtr> nlCons_;
 
  EnginePtr nlpe_;
  
  MILPEnginePtr milpe_;
 
  std::stack<Modification *> nlpMods_;
  
  EngineStatus nlpStatus_;
 
  VariablePtr objVar_;
 
  bool oNl_;
 
  RelaxationPtr rel_;
 
  double relobj_; 
 
  double solAbsTol_;
 
  double solRelTol_;
 
  double objATol_;
 
  double objRTol_;
 
  OAStats *stats_;
 
 
public:
  OAHandler(EnvPtr env, ProblemPtr minlp, EnginePtr nlpe, MILPEnginePtr milpe); 
 
  ~OAHandler();
   
  Branches getBranches(BrCandPtr, DoubleVector &, RelaxationPtr,
                       SolutionPoolPtr)
  {return Branches();};
 
  void getBranchingCandidates(RelaxationPtr, 
                              const DoubleVector &, ModVector &,
                              BrVarCandSet &, BrCandVector &, bool &) {};
 
  std::vector<ConstraintPtr> getNonlinCons() {return nlCons_;}
 
  VariablePtr getObjVar() {return objVar_;}
 
  bool getObjType() { return oNl_;}
 
  MILPEnginePtr getMILPEngine() {return milpe_;};
 
  ModificationPtr getBrMod(BrCandPtr, DoubleVector &, RelaxationPtr,
                           BranchDirection)
  {return ModificationPtr();};
 
       
  // Base class method. 
  std::string getName() const;
 
  // Base class method. Check if x is feasible. x has to satisfy integrality
  // and also nonlinear constraints.
  bool isFeasible(ConstSolutionPtr sol, RelaxationPtr relaxation, 
                  bool & should_prune, double &inf_meas);
 
  SolveStatus presolve(PreModQ *, bool *, Solution **) {return Finished;};
 
  bool presolveNode(RelaxationPtr, NodePtr, SolutionPoolPtr, ModVector &,
                    ModVector &)
  {return false;};
 
  void postsolveGetX(const double *, UInt, DoubleVector *) {};
 
  // Base class method. calls relax_().
  void relaxInitFull(RelaxationPtr, SolutionPool *, bool *) {};
 
  // Base class method. calls relax_().
  void relaxInitInc(RelaxationPtr rel, SolutionPool *, bool *);
 
  // Base class method. Does nothing.
  void relaxNodeFull(NodePtr, RelaxationPtr, bool *) {};
 
  // Base class method. Does nothing.
  void relaxNodeInc(NodePtr, RelaxationPtr, bool *) {};
 
 
  // Base class method. Find cuts.
  void separate(ConstSolutionPtr sol, NodePtr node, RelaxationPtr rel, 
                CutManager *cutman, SolutionPoolPtr s_pool, ModVector &, 
                ModVector &, bool *sol_found, SeparationStatus *status);
 
  //void solveMILP(double* objfLb, double* objfUb,
                 //SolutionPoolPtr solPool, CutManager* cutMan);
  void solveMILP(double* objfLb, ConstSolutionPtr* sol,
                 SolutionPoolPtr solPool, CutManager* cutMan,
                 SolveStatus &status);
  // Show statistics.
  void writeStats(std::ostream &out) const;
 
  void setNonlinCons(std::vector<ConstraintPtr> nlCons) {nlCons_ = nlCons;}
 
  void setObjVar(VariablePtr objvar) {objVar_ = objvar;}
 
  void setObjType(bool oNl) {oNl_ = oNl;}
 
  void setRelaxation(RelaxationPtr rel) {rel_ = rel;}
 
  void setRelObj(double val) {relobj_ = val;}
 
private:
  void addInitLinearX_(const double *x);
 
  void cutIntSol_(ConstSolutionPtr sol, CutManager *cutMan, 
                  SolutionPoolPtr s_pool, bool *sol_found, 
                  SeparationStatus *status);
 
  void fixInts_(const double *x);
  
  void initLinear_(bool *isInf);
 
  void linearizeObj_();
 
 
  void linearAt_(FunctionPtr f, double fval, const double *x, 
                 double *c, LinearFunctionPtr *lf, int *error);
 
  void cutToCons_(const double *nlpx, const double *lpx, CutManager *,
                    SeparationStatus *status);
 
  void cutToConsInf_(const double *nlpx, const double *lpx, CutManager *,
                    SeparationStatus *status);
 
  void addCut_(const double *nlpx, const double *lpx, ConstraintPtr con, 
               CutManager *cutman, SeparationStatus *status);
 
  void addCutInf_(ConstraintPtr con, const double *nlpx, const double *lpx, 
               CutManager *cutman, SeparationStatus *status);
 
  void cutsAtLpSol_(const double *lpx, CutManager *cutman,
                    SeparationStatus *status);
 
 
  void cutToObj_(const double *nlpx, const double *lpx, CutManager *,
                   SeparationStatus *status);
 
  void relax_(bool *is_inf);
 
  void solveNLP_();
 
  void unfixInts_();
 
  void updateUb_(SolutionPoolPtr s_pool, double nlp_val, bool *sol_found);
 
  };
 
  typedef OAHandler* OAHandlerPtr;
}
#endif