/* $Id$ */
// Copyright (C) 2008, International Business Machines
// Corporation and others.  All Rights Reserved.
// This code is licensed under the terms of the Eclipse Public License (EPL).

#ifndef ClpNode_H
#define ClpNode_H

#include "CoinPragma.hpp"

// This implements all stuff for Clp fathom
/** This contains what is in a Clp "node"

 */

class ClpFactorization;
class ClpDualRowSteepest;
class ClpNodeStuff;
class ClpNode {

public:
  /**@name Useful methods */
  //@{
  /** Applies node to model
         0 - just tree bounds
         1 - tree bounds and basis etc
         2 - saved bounds and basis etc
     */
  void applyNode(ClpSimplex *model, int doBoundsEtc);
  /// Choose a new variable
  void chooseVariable(ClpSimplex *model, ClpNodeStuff *info);
  /// Fix on reduced costs
  int fixOnReducedCosts(ClpSimplex *model);
  /// Create odd arrays
  void createArrays(ClpSimplex *model);
  /// Clean up as crunch is different model
  void cleanUpForCrunch();
  //@}

  /**@name Gets and sets */
  //@{
  /// Objective value
  inline double objectiveValue() const
  {
    return objectiveValue_;
  }
  /// Set objective value
  inline void setObjectiveValue(double value)
  {
    objectiveValue_ = value;
  }
  /// Primal solution
  inline const double *primalSolution() const
  {
    return primalSolution_;
  }
  /// Dual solution
  inline const double *dualSolution() const
  {
    return dualSolution_;
  }
  /// Initial value of integer variable
  inline double branchingValue() const
  {
    return branchingValue_;
  }
  /// Sum infeasibilities
  inline double sumInfeasibilities() const
  {
    return sumInfeasibilities_;
  }
  /// Number infeasibilities
  inline int numberInfeasibilities() const
  {
    return numberInfeasibilities_;
  }
  /// Relative depth
  inline int depth() const
  {
    return depth_;
  }
  /// Estimated solution value
  inline double estimatedSolution() const
  {
    return estimatedSolution_;
  }
  /** Way for integer variable -1 down , +1 up */
  int way() const;
  /// Return true if branch exhausted
  bool fathomed() const;
  /// Change state of variable i.e. go other way
  void changeState();
  /// Sequence number of integer variable (-1 if none)
  inline int sequence() const
  {
    return sequence_;
  }
  /// If odd arrays exist
  inline bool oddArraysExist() const
  {
    return lower_ != NULL;
  }
  /// Status array
  inline const unsigned char *statusArray() const
  {
    return status_;
  }
  //@}

  /**@name Constructors, destructor */
  //@{
  /** Default constructor. */
  ClpNode();
  /// Constructor from model
  ClpNode(ClpSimplex *model, const ClpNodeStuff *stuff, int depth);
  /// Does work of constructor (partly so gdb will work)
  void gutsOfConstructor(ClpSimplex *model, const ClpNodeStuff *stuff,
    int arraysExist, int depth);
  /** Destructor */
  virtual ~ClpNode();
  //@}

  /**@name Copy methods (at present illegal - will abort) */
  //@{
  /** The copy constructor. */
  ClpNode(const ClpNode &);
  /// Operator =
  ClpNode &operator=(const ClpNode &);
  //@}

protected:
  // For state of branch
  typedef struct {
    unsigned int firstBranch : 1; //  nonzero if first branch on variable is up
    unsigned int branch : 2; //  0 means do first branch next, 1 second, 2 finished
    unsigned int spare : 29;
  } branchState;
  /**@name Data */
  //@{
  /// Initial value of integer variable
  double branchingValue_;
  /// Value of objective
  double objectiveValue_;
  /// Sum of infeasibilities
  double sumInfeasibilities_;
  /// Estimated solution value
  double estimatedSolution_;
  /// Factorization
  ClpFactorization *factorization_;
  /// Steepest edge weights
  ClpDualRowSteepest *weights_;
  /// Status vector
  unsigned char *status_;
  /// Primal solution
  double *primalSolution_;
  /// Dual solution
  double *dualSolution_;
  /// Integer lower bounds (only used in fathomMany)
  int *lower_;
  /// Integer upper bounds (only used in fathomMany)
  int *upper_;
  /// Pivot variables for factorization
  int *pivotVariables_;
  /// Variables fixed by reduced costs (at end of branch) 0x10000000 added if fixed to UB
  int *fixed_;
  /// State of branch
  branchState branchState_;
  /// Sequence number of integer variable (-1 if none)
  int sequence_;
  /// Number of infeasibilities
  int numberInfeasibilities_;
  /// Relative depth
  int depth_;
  /// Number fixed by reduced cost
  int numberFixed_;
  /// Flags - 1 duals scaled
  int flags_;
  /// Maximum number fixed by reduced cost
  int maximumFixed_;
  /// Maximum rows so far
  int maximumRows_;
  /// Maximum columns so far
  int maximumColumns_;
  /// Maximum Integers so far
  int maximumIntegers_;
  //@}
};
class ClpNodeStuff {

public:
  /**@name Constructors, destructor */
  //@{
  /** Default constructor. */
  ClpNodeStuff();
  /** Destructor */
  virtual ~ClpNodeStuff();
  //@}

  /**@name Copy methods (only copies ints etc, nulls arrays) */
  //@{
  /** The copy constructor. */
  ClpNodeStuff(const ClpNodeStuff &);
  /// Operator =
  ClpNodeStuff &operator=(const ClpNodeStuff &);
  /// Zaps stuff 1 - arrays, 2 ints, 3 both
  void zap(int type);
  //@}

  /**@name Fill methods */
  //@{
  /** Fill with pseudocosts */
  void fillPseudoCosts(const double *down, const double *up,
    const int *priority,
    const int *numberDown, const int *numberUp,
    const int *numberDownInfeasible, const int *numberUpInfeasible,
    int number);
  /// Update pseudo costs
  void update(int way, int sequence, double change, bool feasible);
  /// Return maximum number of nodes
  int maximumNodes() const;
  /// Return maximum space for nodes
  int maximumSpace() const;
  //@}

public:
  /**@name Data */
  //@{
  /// Integer tolerance
  double integerTolerance_;
  /// Integer increment
  double integerIncrement_;
  /// Small change in branch
  double smallChange_;
  /// Down pseudo costs
  double *downPseudo_;
  /// Up pseudo costs
  double *upPseudo_;
  /// Priority
  int *priority_;
  /// Number of times down
  int *numberDown_;
  /// Number of times up
  int *numberUp_;
  /// Number of times down infeasible
  int *numberDownInfeasible_;
  /// Number of times up infeasible
  int *numberUpInfeasible_;
  /// Copy of costs (local)
  double *saveCosts_;
  /// Array of ClpNodes
  ClpNode **nodeInfo_;
  /// Large model if crunched
  ClpSimplex *large_;
  /// Which rows in large model
  int *whichRow_;
  /// Which columns in large model
  int *whichColumn_;
#ifndef NO_FATHOM_PRINT
  /// Cbc's message handler
  CoinMessageHandler *handler_;
#endif
  /// Number bounds in large model
  int nBound_;
  /// Save of specialOptions_ (local)
  int saveOptions_;
  /** Options to pass to solver
         1 - create external reduced costs for columns
         2 - create external reduced costs for rows
         4 - create external row activity (columns always done)
         Above only done if feasible
         32 - just create up to nDepth_+1 nodes
         65536 - set if activated
     */
  int solverOptions_;
  /// Maximum number of nodes to do
  int maximumNodes_;
  /// Number before trust from CbcModel
  int numberBeforeTrust_;
  /// State of search from CbcModel
  int stateOfSearch_;
  /// Number deep
  int nDepth_;
  /// Number nodes returned (-1 if fathom aborted)
  int nNodes_;
  /// Number of nodes explored
  int numberNodesExplored_;
  /// Number of iterations
  int numberIterations_;
  /// Type of presolve - 0 none, 1 crunch
  int presolveType_;
#ifndef NO_FATHOM_PRINT
  /// Depth passed in
  int startingDepth_;
  /// Node at which called
  int nodeCalled_;
#endif
  //@}
};
class ClpHashValue {

public:
  /**@name Useful methods */
  //@{
  /// Return index or -1 if not found
  int index(double value) const;
  /// Add value to list and return index
  int addValue(double value);
  /// Number of different entries
  inline int numberEntries() const
  {
    return numberHash_;
  }
  //@}

  /**@name Constructors, destructor */
  //@{
  /** Default constructor. */
  ClpHashValue();
  /** Useful constructor. */
  ClpHashValue(ClpSimplex *model);
  /** Destructor */
  virtual ~ClpHashValue();
  //@}

  /**@name Copy method */
  //@{
  /** The copy constructor. */
  ClpHashValue(const ClpHashValue &);
  /// =
  ClpHashValue &operator=(const ClpHashValue &);
  //@}
private:
  /**@name private stuff */
  //@{
  /** returns hash */
  int hash(double value) const;
  /// Resizes
  void resize(bool increaseMax);
  //@}

protected:
  /**@name Data members
        The data members are protected to allow access for derived classes. */
  //@{
  /// Data
  // for hashing
  typedef struct {
    double value;
    int index, next;
  } CoinHashLink;
  /// Hash table
  mutable CoinHashLink *hash_;
  /// Number of entries in hash table
  int numberHash_;
  /// Maximum number of entries in hash table i.e. size
  int maxHash_;
  /// Last used space
  int lastUsed_;
  //@}
};
#endif

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