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 convert( casacore::Vector<double> &resultValues, int sourceIndex, int destIndex, casacore::SpectralCoordinate coordinate);
                QString getNewUnits() const;

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

                typedef enum {FREQUENCY_UNIT, VELOCITY_UNIT, WAVELENGTH_UNIT, CHANNEL_UNIT, UNRECOGNIZED } UnitType;

                static UnitType getUnitType( const QString& unit );

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

                QString oldUnits;
                QString newUnits;


        };

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