FitterEstimatesFileParser.h

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//# RegularFileIO.h: Class for IO on a regular file
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//# $Id:  $

#ifndef CASA_FITTERESTIMATESFILEPARSER_H
#define CASA_FITTERESTIMATESFILEPARSER_H

//# Includes
#include <casa/aips.h>
#include <casa/OS/RegularFile.h>
#include <components/ComponentModels/ComponentList.h>
#include <images/Images/ImageInterface.h>
#include <memory>

namespace casa { //# NAMESPACE CASA - BEGIN

// <summary> 
// Class for parsing a file which holds initial estimates for 2-D components. Used by imfit.
// </summary>

// <use visibility=export>

// <reviewed reviewer="" date="" tests="tFitterEstimatesFileParser" demos="">
// </reviewed>

// <prerequisite> 
//    <li> <linkto class=RegularFilebufIO>FilebufIO</linkto> class
// </prerequisite>

// <synopsis> 
// Used for reading files containing initial estimates of models for 2-D fitting.
// The expected format is:
// <ol>
// <li>Lines with a "#" in column 1 are treated as comments and ignored.</li>
// <li> Each non-comment line is treated as a complete set of six comma-delimited
//      parameters for specifying an estimate for a component. The values are
//      Flux (quantity), x pixel position of peak (double), y pixel position of peak (double),
//      FWHM major axis (quantity), FWHM minor axis (quantity), position angle (measured from
//      north to east (quantity).</li>
// <li> Optionally, a component estimate line can have a seventh parameter which is
//      a string specifying which of the parameters for that component should be held
//      fixed during the fit. This string can include any combination of the following
//      identifiers: "f" flux, "x" x position, "y" y position, "a" major axis,
//      "b" minor axis, "p" position angle. So, eg, "apx" means hold the major axis,
//      position angle, and x position constant during the fit. </li>
// </ol>
// If the specified file passed to the constructor does not exist, an exception is thrown.
// Parsing is done during object construction and an exception is thrown if the file
// does not have the expected format.
// </synopsis>
//
// <example>
// <srcblock>
//   FitterEstimatesFilebFileReader reader("myEstimates.txt", myImage);
//   ComponentList cl = reader.getEstimates();
//   Vector<String> fixed = reader.getFixed();
// </srcblock>
// </example>

class FitterEstimatesFileParser {
        public:

                // Constructor
                // <src>filename</src> Name of file containing estimates
                // <src>image</src> Image for which the estimates apply
                explicit FitterEstimatesFileParser(
                        const String& filename,
                        const ImageInterface<Float>& image
                );

                ~FitterEstimatesFileParser();

                // Get the estimates specified in the file as a ComponentList object.
                ComponentList getEstimates() const;

                // Get the fixed parameter masks specified in the file.
                Vector<String> getFixed() const;

                // Get the contents of the file
                String getContents() const;

        private:
                ComponentList _componentList;
                Vector<String> _fixedValues;
                std::unique_ptr<LogIO> _log;
                Vector<Double> _peakValues, _xposValues, _yposValues;
                //Vector<Quantity> fluxValues, majValues, minValues, paValues;
                Vector<Quantity> _majValues, _minValues, _paValues;
                String _contents;

                // default constructor cannot be called.
                FitterEstimatesFileParser();

                // parse the file
                void _parseFile(const RegularFile& myFile);
                void _createComponentList(const ImageInterface<Float>& image);
};

} //# NAMESPACE CASA - END

#endif