Converter.h

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//# Copyright (C) 2005
//# Associated Universities, Inc. Washington DC, USA.
//#
//# This library is free software; you can redistribute it and/or modify it
//# under the terms of the GNU Library 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 Library General Public
//# License for more details.
//#
//# You should have received a copy of the GNU Library General Public License
//# along with this library; if not, write to the Free Software Foundation,
//# Inc., 675 Massachusetts Ave, Cambridge, MA 02139, USA.
//#
//# Correspondence concerning AIPS++ should be addressed as follows:
//#        Internet email: aips2-request@nrao.edu.
//#        Postal address: AIPS++ Project Office
//#                        National Radio Astronomy Observatory
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#ifndef CONVERTER_H_
#define CONVERTER_H_

#include <QList>
#include <QString>
#include <casa/Arrays/Vector.h>
#include <coordinates/Coordinates/SpectralCoordinate.h>
namespace casa {

class Converter {
public:
        Converter( const QString& oldUnits, const QString& newUnits);

        //Factory for producing the appropriate converter.
        //Note:  user is responsible for deleting the converter.
        static Converter* getConverter( const QString& oldUnits,const QString& newUnits );
        static void setSpectralCoordinate( SpectralCoordinate coordinate );
        static void setRestFrequency( double restFrequency );
        static void convert( Vector<double> &resultValues, int sourceIndex, int destIndex);

        bool setVelocityUnits( const QString& units );
        bool setWavelengthUnits( const QString& units );
        QString getNewUnits() const;



        //Abstract methods to be implemented by subclasses.
        //virtual float convert( float oldValue ) const = 0;
        virtual double toPixel( double value ) = 0;
        virtual Vector<double> convert( const Vector<double>& oldValues ) = 0;
        virtual double convert ( double oldValue );
        virtual ~Converter();

protected:
        static const QList<QString> FREQUENCY_UNITS;
        static const QList<QString> WAVELENGTH_UNITS;
        static const QList<QString> VELOCITY_UNITS;

        QString oldUnits;
        QString newUnits;
        static SpectralCoordinate spectralCoordinate;
        typedef enum {FREQUENCY_UNIT, VELOCITY_UNIT, WAVELENGTH_UNIT, CHANNEL_UNIT, UNRECOGNIZED } UnitType;

private:
        static UnitType getUnitType( const QString& unit );

};

} /* namespace casa */
#endif /* CONVERTER_H_ */