unitManager.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_MANAGER_H_
#define _UNIT_MANAGER_H_

#include <QStringList>
#include <QMap>
#include <QPair>
#include <QMutex>
#include <udunits2.h>

#include "unitConfig.h"
#include "unitConverter.h"

class UNIT_API_EXPORT UnitManager
{
public:
  ~UnitManager();

  static UnitManager* instance();

  bool init(QString configPath, QString unitsDatabase, QString unitsConfigScript,
            bool checkUnitDatabase, QString& err);
    
  const Unit&          getUnit(QString name, bool normalize);
  const UnitConverter& getConverter(const Unit& srcUnit, const Unit& destUnit);

  int         numCategories() const;
  QString     categoryName   (int category) const;
  QStringList categorySymbols(int category) const;

private:
  UnitManager();

  bool initUnitDatabase(QString configPath, QString unitsDatabase, QString& err);
  bool initCategories  (QString configPath, QString unitsConfigScript, QString& err);
  bool initCategorySiMapping(bool checkDatabase, QString& err);

  void printCategoryList() const;
  void printCategoryMapping() const;

  ut_system*          _unitSystem; 
  QMap<QString, Unit> _unitCache;  

  QMap<QPair<QString, QString>, UnitConverter> _convCache;

#ifdef UNIT_USE_THREADS
  QMutex _unitSystemMutex;
#endif

  QList< QPair<QString, QStringList> > _categoryData; 

  QMap<QString, int> _categorySiTypes;
};


#endif