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