unitConverter.h

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/************************************************************************
**
** Copyright (C) 2012 K2FS Sistemas e Projetos Ltd.  
** All rights reserved.
**
** This file is part of the "Pdm version 2" library and should not
** be included in other softwares without written permission of K2 
** Sistemas.  It is provided AS IS, with NO WARRANTY OF ANY KIND, 
** INCLUDING THE WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR 
** A PARTICULAR PURPOSE.
**
** Contact information: www.k2sistemas.com.br
**
************************************************************************/

#ifndef _UNIT_CONVERTER_H_
#define _UNIT_CONVERTER_H_

#include "unit.h"

class UNIT_API_EXPORT UnitConverter
{
public:
  UnitConverter() {}

  UnitConverter(const Unit& srcUnit, const Unit& destUnit);
  ~UnitConverter();

  bool isValid() const { return !_converter.isNull() && _converter.data()->conv; }

  const Unit& srcUnit() const { return _srcUnit; }
  
  const Unit& destUnit() const { return _destUnit; }
  
  double convert(double value) const;

  double* convertArray(const double* srcValues, int size, double* dstValues) const;

  UnitConverter reverseConverter() const { return UnitConverter(_destUnit, _srcUnit); }

private:
  friend class UnitManager;

  struct UnitConverterWrapper
  {
    UnitConverterWrapper(cv_converter* c) : conv(c) {}
    ~UnitConverterWrapper() { cv_free(conv); }

    cv_converter* conv; 
  };

  typedef QSharedPointer<UnitConverterWrapper> SharedUnitConverterWrapper;

  UnitConverter(SharedUnitConverterWrapper conv, const Unit& srcUnit,
                   const Unit& destUnit);

  Unit _srcUnit;   
  Unit _destUnit;  

  SharedUnitConverterWrapper _converter; 
};

#endif