MSSelectableTable.h

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// -*- C++ -*-
// # MSSelectableTable.h: The generic interface for tables that can be used with MSSelection
// # Copyright (C) 1996,1997,1998,1999,2001
// # 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
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// #                        Charlottesville, VA 22903-2475 USA
 
#ifndef MS_MSSELECTABLETABLE_H
#define MS_MSSELECTABLETABLE_H
 
#include <casacore/casa/aips.h>
#include <casacore/casa/BasicSL/String.h>
#include <casacore/casa/Arrays/Vector.h>
#include <casacore/casa/Arrays/Matrix.h>
#include <casacore/casa/Arrays/Cube.h>
#include <casacore/tables/TaQL/ExprNode.h>
#include <casacore/ms/MeasurementSets/MeasurementSet.h>
#include <casacore/ms/MeasurementSets/MSMainEnums.h>
#include <casacore/ms/MSSel/MSSelectionError.h>
#include <casacore/ms/MSSel/MSSelectableMainColumn.h>
namespace casacore {  // # NAMESPACE CASACORE - BEGIN
 
// <summary>
//
// MSSelectableTable: An interface class used by MSSelection module to
// access the sub-tables and main-table columns of MS-like tables.
//
// </summary>
 
// <use visibility=export>
 
// <reviewed reviewer="" date="" tests="" demos="">
 
// <prerequisite>
// </prerequisite>
//
// <etymology>
// From "msselection" and "table".
// </etymology>
//
//<synopsis>
//
// This is a pure virtual base-class to provide a table-type agnostic
// interface to the <linkto
// module="MeasurementSets:description">MSSelection</linkto> module to
// access sub-tables and main-table columns of MS-like tables.
//
// </synopsis>
//
// <example>
// <srcblock>
// </srcblock>
// </example>
//
// <motivation>
//
// To allow use of the <linkto
// module="MeasurementSets:description">MSSelection</linkto> module
// for selection on any table that follows the general structure of the
// MS database.  Via this class, minor differences in the database
// layout can be hidden from the MSSelection module.  This also keeps
// MeasurementSet module from depending on other MS-like database
// implemention which may use the MSSelection module.  Such usage will
// need to implement a specialization of <linkto
// module="MeasurementSets:description">MSSelectableTable</linkto> and
// use it to instantiate the <linkto
// module="MeasurementSets:description">MSSelection</linkto> object.
//
// </motivation>
//
// <todo asof="19/03/13">
// </todo>
 
class MSSelectableTable {
 public:
  enum MSSDataType { BASELINE_BASED = 0, PURE_ANTENNA_BASED, REF_ANTENNA_BASED };
 
  MSSelectableTable() {}
  MSSelectableTable(const Table& table) { table_p = &table; }
  virtual ~MSSelectableTable() {}
 
  virtual void setTable(const Table& table) { table_p = &table; }
  const Table* table() { return table_p; }
  TableExprNode col(const String& colName) { return table()->col(colName); }
 
  virtual Bool isMS() = 0;
  virtual MSSDataType dataType() = 0;
  virtual const MSAntenna& antenna() = 0;
  virtual const MSField& field() = 0;
  virtual const MSSpectralWindow& spectralWindow() = 0;
  virtual const MSDataDescription& dataDescription() = 0;
  virtual const MSObservation& observation() = 0;
 
  virtual String columnName(MSMainEnums::PredefinedColumns nameEnum) = 0;
  virtual const MeasurementSet* asMS() = 0;
 
  virtual MSSelectableMainColumn* mainColumns() = 0;
 
 protected:
  const Table* table_p;
};
 
// <summary>
//
// MSInterface: A specialization of MSSelectableTable for accessing
// MS.
//
// </summary>
 
// <use visibility=export>
 
// <reviewed reviewer="" date="" tests="" demos="">
 
// <prerequisite>
// </prerequisite>
//
// <etymology>
//
// From "ms" and "interface".
//
// </etymology>
//
//<synopsis>
//
// A class that can be passed around as MSSelectableTable, with most of
// the methods overloaded to work with the underlaying MS.
//
//</synopsis>
//
// <example>
// <srcblock>
//
// //
// // Fill in the expression in the various strings that are passed for
// // parsing to the MSSelection object later.
// //
// String fieldStr,timeStr,spwStr,baselineStr,
//   uvdistStr,taqlStr,scanStr,arrayStr, polnStr,stateObsModeStr,
//   observationStr;
// baselineStr="1&2";
// timeStr="*+0:10:0";
// fieldStr="CygA*";
// //
// // Instantiate the MS and the MSInterface objects.
// //
// MS ms(MSName),selectedMS(ms);
// MSInterface msInterface(ms);
// //
// // Setup the MSSelection thingi
// //
// MSSelection msSelection;
//
// msSelection.reset(msInterface,MSSelection::PARSE_NOW,
//          timeStr,baselineStr,fieldStr,spwStr,
//          uvdistStr,taqlStr,polnStr,scanStr,arrayStr,
//          stateObsModeStr,observationStr);
// if (msSelection.getSelectedMS(selectedMS))
//   cerr << "Got the selected MS!" << std::endl;
// else
//   cerr << "The set of expressions resulted into null-selection";
// </srcblock>
// </example>
//
// <motivation>
//
// To generalize the implementation of the MSSelection parsers.
//
// </motivation>
//
// <todo asof="19/03/13">
// </todo>
 
class MSInterface : public MSSelectableTable {
 public:
  MSInterface() : msMainCols_p(NULL) {}
  MSInterface(const Table& table);
  virtual ~MSInterface() {
    if (msMainCols_p) delete msMainCols_p;
  }
  virtual const MSAntenna& antenna() { return asMS()->antenna(); }
  virtual const MSField& field() { return asMS()->field(); }
  virtual const MSSpectralWindow& spectralWindow() { return asMS()->spectralWindow(); }
  virtual const MSDataDescription& dataDescription() { return asMS()->dataDescription(); }
  virtual const MSObservation& observation() { return asMS()->observation(); }
  virtual String columnName(MSMainEnums::PredefinedColumns nameEnum) {
    return MS::columnName(nameEnum);
  }
  virtual Bool isMS() { return True; }
  virtual MSSDataType dataType() { return MSSelectableTable::BASELINE_BASED; }
 
  virtual const MeasurementSet* asMS() { return static_cast<const MeasurementSet*>(table()); }
  virtual MSSelectableMainColumn* mainColumns() {
    msMainCols_p = new MSMainColInterface(*table_p);
    return msMainCols_p;
  }
 
 private:
  MSMainColInterface* msMainCols_p;
};
}  // namespace casacore
 
#endif