Constraints.h

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//
// File: Constraints.h
// Created by: Julien Dutheil
// Created on: Thu Dec 25 19:35:17 2003
//

/*
   Copyright or © or Copr. Bio++ Development Team, (November 17, 2004)

   This software is a computer program whose purpose is to provide classes
   for numerical calculus.

   This software is governed by the CeCILL  license under French law and
   abiding by the rules of distribution of free software.  You can  use,
   modify and/ or redistribute the software under the terms of the CeCILL
   license as circulated by CEA, CNRS and INRIA at the following URL
   "http://www.cecill.info".

   As a counterpart to the access to the source code and  rights to copy,
   modify and redistribute granted by the license, users are provided only
   with a limited warranty  and the software's author,  the holder of the
   economic rights,  and the successive licensors  have only  limited
   liability.

   In this respect, the user's attention is drawn to the risks associated
   with loading,  using,  modifying and/or developing or reproducing the
   software by the user in light of its specific status of free software,
   that may mean  that it is complicated to manipulate,  and  that  also
   therefore means  that it is reserved for developers  and  experienced
   professionals having in-depth computer knowledge. Users are therefore
   encouraged to load and test the software's suitability as regards their
   requirements in conditions enabling the security of their systems and/or
   data to be ensured and,  more generally, to use and operate it in the
   same conditions as regards security.

   The fact that you are presently reading this means that you have had
   knowledge of the CeCILL license and that you accept its terms.
 */

#ifndef _CONSTRAINTS_H_
#define _CONSTRAINTS_H_

// From the STL:
#include <string>
#include <iostream>

// From Utils:
#include "../Clonable.h"
#include "../Text/TextTools.h"

#include "NumConstants.h"

namespace bpp
{
class Constraint : public Clonable
{
public:
  Constraint() {}
  virtual ~Constraint() {}

  Constraint* clone() const = 0;

public:
  virtual bool isCorrect(double value) const = 0;

  virtual bool includes(double min, double max) const = 0;

  virtual double getLimit(double value) const = 0;

  virtual double getAcceptedLimit(double value) const = 0;

  virtual std::string getDescription() const = 0;

  virtual Constraint* operator&(const Constraint& c) const = 0;
};

class IntervalConstraint : public Constraint
{
protected:
  double lowerBound_, upperBound_;

  bool inclLowerBound_, inclUpperBound_;
  double precision_;
  

public:
  IntervalConstraint() :  lowerBound_(NumConstants::MINF()),
                upperBound_(NumConstants::PINF()),
                inclLowerBound_(true),
                inclUpperBound_(true),
                precision_(NumConstants::TINY()) {}

  IntervalConstraint(double lowerBound, double upperBound, bool inclLower, bool inclUpper, double precision = NumConstants::TINY()) :
    lowerBound_(lowerBound),
    upperBound_(upperBound),
    inclLowerBound_(inclLower),
    inclUpperBound_(inclUpper),
    precision_(precision) {}
 
  IntervalConstraint(bool isPositive, double bound, bool incl, double precision = NumConstants::TINY()) :
    lowerBound_(isPositive ? bound : NumConstants::MINF()),
    upperBound_(isPositive ? NumConstants::PINF() : bound),
    inclLowerBound_(isPositive ? incl : false),
    inclUpperBound_(isPositive ? false : incl),
    precision_(precision) {}
 
  virtual ~IntervalConstraint() {}

  IntervalConstraint* clone() const { return new IntervalConstraint(*this); }

public:
  void setLowerBound(double lowerBound, bool strict) { lowerBound_ = lowerBound; inclLowerBound_ = !strict; }
  void setUpperBound(double upperBound, bool strict) { upperBound_ = upperBound; inclUpperBound_ = !strict; }

  double getLowerBound() const { return lowerBound_; }
  double getUpperBound() const { return upperBound_; }

  bool strictLowerBound() const { return !inclLowerBound_; }
  bool strictUpperBound() const { return !inclUpperBound_; }

  bool finiteLowerBound() const { return lowerBound_ > NumConstants::MINF(); }
  bool finiteUpperBound() const { return upperBound_ < NumConstants::PINF(); }

  bool includes(double min, double max) const
  {
    return (inclLowerBound_ ? min >= getLowerBound() : min > getLowerBound()) &&
           (inclUpperBound_ ? max <= getUpperBound() : max < getUpperBound());
  }

  virtual bool isCorrect(double value) const
  {
    return (inclLowerBound_ ? value >= getLowerBound() : value > getLowerBound()) &&
           (inclUpperBound_ ? value <= getUpperBound() : value < getUpperBound());
  }

  bool operator<(double value) const
  {
    return inclUpperBound_ ? upperBound_ < value : upperBound_ <= value;
  }

  bool operator>(double value) const
  {
    return inclLowerBound_ ? lowerBound_ > value : lowerBound_ >= value;
  }

  bool operator<=(double value) const
  {
    return upperBound_ <= value;
  }

  bool operator>=(double value) const
  {
    return lowerBound_ >= value;
  }

  double getLimit(double value) const
  {
    return isCorrect(value) ? value :
           (*this >= value ? lowerBound_ : upperBound_);
  }

  double getAcceptedLimit(double value) const
  {
    return isCorrect(value) ? value :
           (*this >= value ?
            strictLowerBound() ? lowerBound_ + precision_ : lowerBound_ :
            strictUpperBound() ? upperBound_ - precision_ : upperBound_);
  }

  double getPrecision() const
  {
    return precision_;
  }
  
  std::string getDescription() const
  {
    return (inclLowerBound_ ? "[ " : "]")
           + (finiteLowerBound() ? TextTools::toString(lowerBound_) : "-inf")
           + ", "
           + (finiteUpperBound() ? TextTools::toString(upperBound_) : "+inf")
           + (inclUpperBound_ ? "] " : "[");
  }

  Constraint* operator&(const Constraint& c) const
  {
    double lowerBound, upperBound;
    bool inclLowerBound, inclUpperBound;

    const IntervalConstraint* pi = dynamic_cast<const IntervalConstraint*>(&c);

    if (pi)
    {
      if (lowerBound_ <= pi->lowerBound_)
      {
        lowerBound = pi->lowerBound_;
        inclLowerBound = pi->inclLowerBound_;
      }
      else
      {
        lowerBound = lowerBound_;
        inclLowerBound = inclLowerBound_;
      }

      if (upperBound_ >= pi->upperBound_)
      {
        upperBound = pi->upperBound_;
        inclUpperBound = pi->inclUpperBound_;
      }
      else
      {
        upperBound = upperBound_;
        inclUpperBound = inclUpperBound_;
      }
      return new IntervalConstraint(lowerBound, upperBound, inclLowerBound, inclUpperBound, (precision_>pi->getPrecision())?precision_:pi->getPrecision());
    }
    else
      return 0;
  }

  IntervalConstraint& operator&=(const Constraint& c)
  {
    const IntervalConstraint* pi = dynamic_cast<const IntervalConstraint*>(&c);

    if (pi)
    {
      if (lowerBound_ <= pi->lowerBound_)
      {
        lowerBound_ = pi->lowerBound_;
        inclLowerBound_ = pi->inclLowerBound_;
      }
      else
      {
        lowerBound_ = lowerBound_;
        inclLowerBound_ = inclLowerBound_;
      }

      if (upperBound_ >= pi->upperBound_)
      {
        upperBound_ = pi->upperBound_;
        inclUpperBound_ = pi->inclUpperBound_;
      }
      else
      {
        upperBound_ = upperBound_;
        inclUpperBound_ = inclUpperBound_;
      }
      if (pi->getPrecision()>precision_)
        precision_=pi->getPrecision();
    }

    return *this;
  }

  bool operator==(const IntervalConstraint& i) const
  {
    return lowerBound_ == i.lowerBound_
      && inclLowerBound_ == i.inclLowerBound_
      && upperBound_ == i.upperBound_
      && inclUpperBound_ == i.inclUpperBound_;
  }

  bool operator!=(const IntervalConstraint& i) const
  {
    return lowerBound_ != i.lowerBound_
      || inclLowerBound_ != i.inclLowerBound_
      || upperBound_ != i.upperBound_
      || inclUpperBound_ != i.inclUpperBound_;
  }

  bool operator<=(const IntervalConstraint& i) const
  {
    return lowerBound_ >= i.lowerBound_
           && upperBound_ <= i.upperBound_;
  }
};


} // end of namespace bpp.

#endif  // _CONSTRAINTS_H_