unit.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_H_
#define _UNIT_H_

#include <assert.h>
#include <QString>
#include <QSharedPointer>

#include <udunits2.h>

#include "unitConfig.h"

class UnitConverter;


class UNIT_API_EXPORT Unit
{
public:
  Unit() : _unitCategory(0) {}

  Unit(QString unitName, bool normalize=false);

  ~Unit();
  
  bool isKnown() const { return !_udunit.isNull() && udunit(); } 

  bool isUnknown() const { return !isKnown(); }

  int category() const { return _unitCategory; }
  
  QString name() const { return _unitName; }

  QString siConv() const { return _siConv; }

  QString siBase() const { return extractSiBase(_siConv); }

  bool operator==(const Unit& o) const
  {
    return (_udunit && _udunit == o._udunit) || (_siConv == o._siConv);
  }
  
  bool operator!=(const Unit& o) const { return !(*this == o); }

  bool equal(const Unit& o) const
  {
    return (_udunit && _udunit == o._udunit) || (_unitName == o._unitName);
  }

  UnitConverter getConverter(const Unit& destUnit) const;

  bool canConvertTo(const Unit& destUnit) const;

  double convertTo(double val, const Unit& destUnit, bool* ok=NULL) const;

  void print() const;

  static UnitConverter* converter(const Unit& srcUnit, const Unit& dstUnit, bool* compatible = NULL);

private:
  friend class UnitConverter;
  friend class UnitManager;

  struct UnitWrapper
  {
    UnitWrapper(ut_unit* u) : unit(u) {}
    ~UnitWrapper() { ut_free(unit); }

    ut_unit* unit; 
  };

  typedef QSharedPointer<UnitWrapper> SharedUnitWrapper;


  Unit(SharedUnitWrapper udunit, int category, QString name, QString siconv);

  static QString extractSiBase(QString unit);

  ut_unit* udunit() const { assert(!_udunit.isNull()); return _udunit.data()->unit; }

  void setCategory(int cat) { _unitCategory = cat; }

  SharedUnitWrapper _udunit;

  int     _unitCategory; 
  QString _unitName;     
  QString _siConv;       
};


#endif