MSFreqOffColumns.h

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// # MSFreqOffsetColumns.h: provides easy access to FREQ_OFFSET columns
// # Copyright (C) 1999,2000
// # 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: casa-feedback@nrao.edu.
// #        Postal address: AIPS++ Project Office
// #                        National Radio Astronomy Observatory
// #                        520 Edgemont Road
// #                        Charlottesville, VA 22903-2475 USA
 
#ifndef MS_MSFREQOFFCOLUMNS_H
#define MS_MSFREQOFFCOLUMNS_H
 
#include <casacore/casa/aips.h>
#include <casacore/measures/Measures/MEpoch.h>
#include <casacore/measures/Measures/MCEpoch.h>
#include <casacore/measures/TableMeasures/ScalarMeasColumn.h>
#include <casacore/measures/TableMeasures/ScalarQuantColumn.h>
#include <casacore/tables/Tables/ScalarColumn.h>
 
namespace casacore {  // # NAMESPACE CASACORE - BEGIN
 
class MSFreqOffset;
 
// <summary>
// A class to provide easy access to MSFreqOffset columns
// </summary>
 
// <use visibility=export>
 
// <reviewed reviewer="Bob Garwood" date="1997/02/01" tests="" demos="">
// </reviewed>
 
// <prerequisite>
//   <li> MSFreqOffset
//   <li> ScalarColumn
// </prerequisite>
//
// <etymology>
// MSFreqOffsetColumns stands for MeasurementSet FreqOffset Table
// columns.
// </etymology>
//
// <synopsis>
// This class provides access to the columns in the MSFreqOffset Table,
// it does the declaration of all the Scalar and ArrayColumns with the
// correct types, so the application programmer doesn't have to
// worry about getting those right. There is an access function
// for every predefined column. Access to non-predefined columns will still
// have to be done with explicit declarations.
// See <linkto class=MSColumns> MSColumns</linkto> for an example.
// </synopsis>
//
// <motivation>
// See <linkto class=MSColumns> MSColumns</linkto> for the motivation.
// </motivation>
 
class MSFreqOffsetColumns {
 public:
  // Create a columns object that accesses the data in the specified Table
  MSFreqOffsetColumns(const MSFreqOffset& msFreqOffset);
 
  // The destructor does nothing special
  ~MSFreqOffsetColumns();
 
  // Is this object defined? (MSFreqOffset table is optional)
  Bool isNull() const { return isNull_p; }
 
  // Access to required columns
  // <group>
  ScalarColumn<Int>& antenna1() { return antenna1_p; }
  ScalarColumn<Int>& antenna2() { return antenna2_p; }
  ScalarColumn<Int>& feedId() { return feedId_p; }
  ScalarColumn<Double>& interval() { return interval_p; }
  ScalarQuantColumn<Double>& intervalQuant() { return intervalQuant_p; }
  ScalarColumn<Double>& offset() { return offset_p; }
  ScalarQuantColumn<Double>& offsetQuant() { return offsetQuant_p; }
  ScalarColumn<Int>& spectralWindowId() { return spectralWindowId_p; }
  ScalarColumn<Double>& time() { return time_p; }
  ScalarQuantColumn<Double>& timeQuant() { return timeQuant_p; }
  ScalarMeasColumn<MEpoch>& timeMeas() { return timeMeas_p; }
  // </group>
 
  // Const access to required columns
  // <group>
  const ScalarColumn<Int>& antenna1() const { return antenna1_p; }
  const ScalarColumn<Int>& antenna2() const { return antenna2_p; }
  const ScalarColumn<Int>& feedId() const { return feedId_p; }
  const ScalarColumn<Double>& interval() const { return interval_p; }
  const ScalarQuantColumn<Double>& intervalQuant() const { return intervalQuant_p; }
  const ScalarColumn<Double>& offset() const { return offset_p; }
  const ScalarQuantColumn<Double>& offsetQuant() const { return offsetQuant_p; }
  const ScalarColumn<Int>& spectralWindowId() const { return spectralWindowId_p; }
  const ScalarColumn<Double>& time() const { return time_p; }
  const ScalarQuantColumn<Double>& timeQuant() const { return timeQuant_p; }
  const ScalarMeasColumn<MEpoch>& timeMeas() const { return timeMeas_p; }
  // </group>
 
  // Convenience function that returns the number of rows in any of the
  // columns. Returns zero if the object is null.
  rownr_t nrow() const { return isNull() ? 0 : antenna1_p.nrow(); }
 
  // set the epoch type for the TIME column.
  // <note role=tip>
  // In principle this function can only be used if the table is empty,
  // otherwise already written values may thereafter have an incorrect
  // reference, offset, or unit.  However, it is possible that part of the
  // table gets written before these values are known.  In that case the
  // reference, offset, or units can be set by using a False
  // <src>tableMustBeEmpty</src> argument.
  // </note>
  void setEpochRef(MEpoch::Types ref, Bool tableMustBeEmpty = True);
 
 protected:
  // # default constructor creates a object that is not usable. Use the attach
  // # function correct this.
  MSFreqOffsetColumns();
 
  // # attach this object to the supplied table.
  void attach(const MSFreqOffset& msFreqOffset);
 
 private:
  // # Make the assignment operator and the copy constructor private to prevent
  // # any compiler generated one from being used.
  MSFreqOffsetColumns(const MSFreqOffsetColumns&);
  MSFreqOffsetColumns& operator=(const MSFreqOffsetColumns&);
 
  // # Is the object not attached to a Table.
  Bool isNull_p;
 
  // # required columns
  ScalarColumn<Int> antenna1_p;
  ScalarColumn<Int> antenna2_p;
  ScalarColumn<Int> feedId_p;
  ScalarColumn<Double> interval_p;
  ScalarColumn<Double> offset_p;
  ScalarColumn<Int> spectralWindowId_p;
  ScalarColumn<Double> time_p;
 
  // # Access to Measure columns
  ScalarMeasColumn<MEpoch> timeMeas_p;
 
  // # Access to Quantum columns
  ScalarQuantColumn<Double> intervalQuant_p;
  ScalarQuantColumn<Double> offsetQuant_p;
  ScalarQuantColumn<Double> timeQuant_p;
};
 
// # Define the RO version for backward compatibility.
typedef MSFreqOffsetColumns ROMSFreqOffsetColumns;
 
}  // namespace casacore
 
#endif