Converter.h

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00001 //# Copyright (C) 2005
00002 //# Associated Universities, Inc. Washington DC, USA.
00003 //#
00004 //# This library is free software; you can redistribute it and/or modify it
00005 //# under the terms of the GNU Library General Public License as published by
00006 //# the Free Software Foundation; either version 2 of the License, or (at your
00007 //# option) any later version.
00008 //#
00009 //# This library is distributed in the hope that it will be useful, but WITHOUT
00010 //# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
00011 //# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Library General Public
00012 //# License for more details.
00013 //#
00014 //# You should have received a copy of the GNU Library General Public License
00015 //# along with this library; if not, write to the Free Software Foundation,
00016 //# Inc., 675 Massachusetts Ave, Cambridge, MA 02139, USA.
00017 //#
00018 //# Correspondence concerning AIPS++ should be addressed as follows:
00019 //#        Internet email: aips2-request@nrao.edu.
00020 //#        Postal address: AIPS++ Project Office
00021 //#                        National Radio Astronomy Observatory
00022 //#                        520 Edgemont Road
00023 //#                        Charlottesville, VA 22903-2475 USA
00024 //#
00025 
00026 #ifndef CONVERTER_H_
00027 #define CONVERTER_H_
00028 
00029 #include <QList>
00030 #include <QString>
00031 #include <casa/Arrays/Vector.h>
00032 #include <coordinates/Coordinates/SpectralCoordinate.h>
00033 namespace casa {
00034 
00035         class Converter {
00036         public:
00037                 Converter( const QString& oldUnits, const QString& newUnits);
00038 
00039                 //Factory for producing the appropriate converter.
00040                 //Note:  user is responsible for deleting the converter.
00041                 static Converter* getConverter( const QString& oldUnits,const QString& newUnits );
00042                 static void convert( Vector<double> &resultValues, int sourceIndex, int destIndex, SpectralCoordinate coordinate);
00043                 QString getNewUnits() const;
00044 
00045                 //Abstract methods to be implemented by subclasses.
00046                 virtual double toPixel( double value, SpectralCoordinate coordinate ) = 0;
00047                 virtual Vector<double> convert( const Vector<double>& oldValues, SpectralCoordinate coordinate) = 0;
00048                 virtual double convert ( double oldValue, SpectralCoordinate coordinate);
00049                 virtual ~Converter();
00050 
00051                 typedef enum {FREQUENCY_UNIT, VELOCITY_UNIT, WAVELENGTH_UNIT, CHANNEL_UNIT, UNRECOGNIZED } UnitType;
00052 
00053                 static UnitType getUnitType( const QString& unit );
00054 
00055         protected:
00056                 static const QList<QString> FREQUENCY_UNITS;
00057                 static const QList<QString> WAVELENGTH_UNITS;
00058                 static const QList<QString> VELOCITY_UNITS;
00059 
00060                 QString oldUnits;
00061                 QString newUnits;
00062 
00063 
00064         };
00065 
00066 } /* namespace casa */
00067 #endif /* CONVERTER_H_ */