eoRealBounds.h

// -*- mode: c++; c-indent-level: 4; c++-member-init-indent: 8; comment-column: 35; -*-

//-----------------------------------------------------------------------------
// eoRealBounds.h
// (c) Marc Schoenauer 2001, Maarten Keijzer 2000, GeNeura Team, 1998
/* 
    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

    Contact: todos@geneura.ugr.es, http://geneura.ugr.es
             Marc.Schoenauer@polytechnique.fr
             mak@dhi.dk
 */
//-----------------------------------------------------------------------------

#ifndef _eoRealBounds_h
#define _eoRealBounds_h

#include <stdexcept>               // std::exceptions!
#include <utils/eoRNG.h>

class eoRealBounds : public eoPersistent
{ 
public:
  virtual ~eoRealBounds(){}

  virtual bool isBounded(void) const  = 0;

  virtual bool hasNoBoundAtAll(void) const  = 0;

  virtual bool isMinBounded(void) const = 0;

  virtual bool isMaxBounded(void) const = 0;

  virtual bool isInBounds(double)  const = 0;

  virtual void foldsInBounds(double &)  const = 0;

  virtual void truncate(double &)  const = 0;

  virtual double minimum()  const = 0 ;
  virtual double maximum()  const = 0 ;
  virtual double range()  const = 0;

  virtual double uniform(eoRng & _rng = eo::rng)  const = 0;

  virtual eoRealBounds * dup()  const = 0;
};

class eoRealNoBounds : public eoRealBounds
{
public:
  virtual ~eoRealNoBounds(){}

  virtual bool isBounded(void)  const {return false;}
  virtual bool hasNoBoundAtAll(void) const  {return true;}
  virtual bool isMinBounded(void)  const {return false;}
  virtual bool isMaxBounded(void)  const {return false;}
  virtual void foldsInBounds(double &)  const {return;}
  virtual void truncate(double &)  const {return;}
  virtual bool isInBounds(double)  const {return true;}

  virtual double minimum() const
  {
    throw std::logic_error("Trying to get minimum of unbounded eoRealBounds");
  }
  virtual double maximum() const 
  {
    throw std::logic_error("Trying to get maximum of unbounded eoRealBounds");
  }
  virtual double range() const 
  {
    throw std::logic_error("Trying to get range of unbounded eoRealBounds");
  }

  virtual double uniform(eoRng & _rng = eo::rng) const 
  {
    throw std::logic_error("Trying to generate uniform values in unbounded eoRealBounds");
  }

  // methods from eoPersistent
  virtual void readFrom(std::istream& _is) 
  {
    throw std::runtime_error("Should not use eoRealBounds::readFrom");
  }

  virtual void printOn(std::ostream& _os) const
  {
    _os << "[-inf,+inf]";
  }

  virtual eoRealBounds * dup() const 
  {
    return new eoRealNoBounds(*this);
  }

};

// one object for all - see eoRealBounds.cpp
extern eoRealNoBounds eoDummyRealNoBounds;

class eoRealInterval : public eoRealBounds
{
public :
  virtual ~eoRealInterval(){}
  
  eoRealInterval(double _min=0, double _max=1) : 
    repMinimum(_min), repMaximum(_max), repRange(_max-_min) 
  {
    if (repRange<=0)
      throw std::logic_error("Void range in eoRealBounds");
  }

  // accessors  
  virtual double minimum() const { return repMinimum; }
  virtual double maximum() const { return repMaximum; }
  virtual double range()  const { return repRange; }

  // description
  virtual bool isBounded(void)  const {return true;}
  virtual bool hasNoBoundAtAll(void)  const {return false;}
  virtual bool isMinBounded(void)  const {return true;}
  virtual bool isMaxBounded(void)  const {return true;}

  virtual double uniform(eoRng & _rng = eo::rng) const 
  {
    return repMinimum + _rng.uniform(repRange);
  }  

  // says if a given double is within the bounds
  virtual bool isInBounds(double _r) const 
  {
    if (_r < repMinimum)
      return false;
    if (_r > repMaximum)
      return false;
    return true;
  }

  // folds a value into bounds
  virtual void foldsInBounds(double &  _r) const 
  {
    long iloc;
    double dlargloc = 2 * range() ;

    if (fabs(_r) > 1.0E9)               // iloc too large!
      {
        _r = uniform();
        return;
      }

    if ( (_r > maximum()) )
      {
        iloc = (long) ( (_r-minimum()) / dlargloc ) ;
        _r -= dlargloc * iloc ;
        if ( _r > maximum() )
          _r = 2*maximum() - _r ;
      }
    
    if (_r < minimum()) 
      {
        iloc = (long) ( (maximum()-_r) / dlargloc ) ;
        _r += dlargloc * iloc ;
        if (_r < minimum())
          _r = 2*minimum() - _r ;
      }
  }    

  // truncates to the bounds
  virtual void truncate(double & _r) const 
  {
    if (_r < repMinimum)
      _r = repMinimum;
    else if (_r > repMaximum)
      _r = repMaximum;
    return;
  }

  // methods from eoPersistent
  virtual void readFrom(std::istream& _is) 
  {
    throw std::runtime_error("Should not use eoRealInterval::readFrom");
  }

  virtual void printOn(std::ostream& _os) const
  {
    _os << "[" << repMinimum << "," << repMaximum << "]";
  }

  virtual eoRealBounds * dup() const 
  {
    return new eoRealInterval(*this);
  }

private :
  double repMinimum;
  double repMaximum;
  double repRange;                         // to minimize operations ???
};

class eoRealBelowBound : public eoRealBounds
{
public :
  virtual ~eoRealBelowBound(){}  
  eoRealBelowBound(double _min=0) : 
    repMinimum(_min)
  {}

  // accessors  
  virtual double minimum() const { return repMinimum; }

  virtual double maximum() const 
  {
    throw std::logic_error("Trying to get maximum of eoRealBelowBound");
  }
  virtual double range() const 
  {
    throw std::logic_error("Trying to get range of eoRealBelowBound");
  }

  // random generators
  virtual double uniform(eoRng & _rng = eo::rng) const 
  {
    throw std::logic_error("Trying to generate uniform values in eoRealBelowBound");
  }

  // description
  virtual bool isBounded(void)  const {return false;}
  virtual bool hasNoBoundAtAll(void)  const {return false;}
  virtual bool isMinBounded(void)  const {return true;}
  virtual bool isMaxBounded(void) const  {return false;}

  // says if a given double is within the bounds
  virtual bool isInBounds(double _r) const 
  {
    if (_r < repMinimum)
      return false;
    return true;
  }

  // folds a value into bounds
  virtual void foldsInBounds(double &  _r) const 
  {
    // easy as a pie: symmetry w.r.t. minimum
    if (_r < repMinimum)           // nothing to do otherwise
      _r = 2*repMinimum - _r;
    return ;
  }    

  // truncates to the bounds
  virtual void truncate(double & _r) const 
  {
    if (_r < repMinimum)
      _r = repMinimum;
    return;
  }

  // methods from eoPersistent
  virtual void readFrom(std::istream& _is) 
  {
    throw std::runtime_error("Should not use eoRealBelowBound::readFrom");
  }

  virtual void printOn(std::ostream& _os) const
  {
    _os << "[" << repMinimum << ",+inf]";
  }

  virtual eoRealBounds * dup() const 
  {
    return new eoRealBelowBound(*this);
  }

private :
  double repMinimum;
};

class eoRealAboveBound : public eoRealBounds
{
public :
  virtual ~eoRealAboveBound(){}
  
  eoRealAboveBound(double _max=0) : 
    repMaximum(_max)
  {}

  // accessors  
  virtual double maximum() const  { return repMaximum; }

  virtual double minimum() const 
  {
    throw std::logic_error("Trying to get minimum of eoRealAboveBound");
  }
  virtual double range() const 
  {
    throw std::logic_error("Trying to get range of eoRealAboveBound");
  }

  // random generators
  virtual double uniform(eoRng & _rng = eo::rng) const 
  {
    throw std::logic_error("Trying to generate uniform values in eoRealAboveBound");
  }

  // description
  virtual bool isBounded(void)  const {return false;}
  virtual bool hasNoBoundAtAll(void)  const {return false;}
  virtual bool isMinBounded(void)  const {return false;}
  virtual bool isMaxBounded(void)  const {return true;}

  // says if a given double is within the bounds
  virtual bool isInBounds(double _r) const 
  {
    if (_r > repMaximum)
      return false;
    return true;
  }

  // folds a value into bounds
  virtual void foldsInBounds(double &  _r) const 
  {
    // easy as a pie: symmetry w.r.t. maximum
    if (_r > repMaximum)           // nothing to do otherwise
      _r = 2*repMaximum - _r;
    return ;
  }    

  // truncates to the bounds
  virtual void truncate(double & _r) const 
  {
    if (_r > repMaximum)
      _r = repMaximum;
    return;
  }

  // methods from eoPersistent
  virtual void readFrom(std::istream& _is) 
  {
    throw std::runtime_error("Should not use eoRealAboveBound::readFrom");
  }

  virtual void printOn(std::ostream& _os) const
  {
    _os << "[-inf," << repMaximum << "]";
  }

  virtual eoRealBounds * dup() const 
  {
    return new eoRealAboveBound(*this);
  }

private :
  double repMaximum;
};


class eoGeneralRealBounds : public eoRealBounds
{
public:
  eoGeneralRealBounds(std::string _s = "[-infinity,+infinity]")
  {
    repBound = getBoundsFromString(_s);
  }

  eoGeneralRealBounds(const eoGeneralRealBounds & _b):eoRealBounds(_b)
  {
    // replicate the embedded bound (I'm pretty sure there is another
    // way to do that !!!

    bool minBounded = _b.isMinBounded();
    bool maxBounded = _b.isMaxBounded();
    double minimum, maximum;
    const eoRealBounds & bb = _b.theBounds();
    if (minBounded) minimum = bb.minimum();
    if (maxBounded) maximum = bb.maximum();

      if (minBounded && maxBounded)
        repBound = new eoRealInterval(minimum, maximum);
      else if (!minBounded && !maxBounded)      // no bound at all
        repBound = new eoRealNoBounds;
      else if (!minBounded && maxBounded)
        repBound = new eoRealAboveBound(maximum);
      else if (minBounded && !maxBounded)
        repBound = new eoRealBelowBound(minimum);
  }

  eoGeneralRealBounds& operator=(const eoGeneralRealBounds& _b)
  {
    // replicate the embedded bound (I'm pretty sure there is another
    // way to do that !!!

    bool minBounded = _b.isMinBounded();
    bool maxBounded = _b.isMaxBounded();
    double minimum, maximum;
    const eoRealBounds & bb = _b.theBounds();
    if (minBounded) minimum = bb.minimum();
    if (maxBounded) maximum = bb.maximum();

    // first delete the embedded bounds if necessary
    if (repBound)
      delete repBound;
    // now reallocate
      if (minBounded && maxBounded)
        repBound = new eoRealInterval(minimum, maximum);
      else if (!minBounded && !maxBounded)      // no bound at all
        repBound = new eoRealNoBounds;
      else if (!minBounded && maxBounded)
        repBound = new eoRealAboveBound(maximum);
      else if (minBounded && !maxBounded)
        repBound = new eoRealBelowBound(minimum);
      return (*this);
  }


  ~eoGeneralRealBounds()
  {
    delete repBound;
  }


  virtual bool isBounded(void)  const {return repBound->isBounded();}

  virtual bool hasNoBoundAtAll(void)  const {return repBound->hasNoBoundAtAll();}

  virtual bool isMinBounded(void)  const {return repBound->isMinBounded();}

  virtual bool isMaxBounded(void) const {return repBound->isMaxBounded();}

  virtual bool isInBounds(double _x)  const {return repBound->isInBounds(_x);}

  virtual void foldsInBounds(double & _x) const {return repBound->foldsInBounds(_x);}

  virtual void truncate(double & _x)  const {return repBound->truncate(_x);}

  virtual double minimum()  const {return repBound->minimum();}
  virtual double maximum() const {return repBound->maximum();}
  virtual double range()  const {return repBound->range();}

  virtual double uniform(eoRng & _rng = eo::rng)  const {return repBound->uniform();}

  virtual eoRealBounds * dup() const  {return repBound->dup();}

  const eoRealBounds & theBounds()  const { return *repBound;} 

  virtual void printOn(std::ostream& _os) const
  {
    repBound->printOn(_os);
  }

  virtual void readFrom(std::istream& _is) 
  {
    std::string s;
    _is >> s;
    if (repBound)
      delete repBound;
    repBound = getBoundsFromString(s);
  }

private:
  // reading from a string
  eoRealBounds * getBoundsFromString(std::string);

  eoRealBounds * repBound;
};


#endif

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