SSMIndStringColumn.h

Go to the documentation of this file.

// # SSMIndStringColumn.h: An Indirect String Array Column in the SSM
// # Copyright (C) 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 TABLES_SSMINDSTRINGCOLUMN_H
#define TABLES_SSMINDSTRINGCOLUMN_H
 
// # Includes
#include <casacore/casa/aips.h>
#include <casacore/tables/DataMan/SSMDirColumn.h>
 
namespace casacore {  // # NAMESPACE CASACORE - BEGIN
 
// # Forward declarations
 
// <summary>
// An Indirect String Array Column in the Standard Storage Manager.
// </summary>
 
// <use visibility=local>
 
// <reviewed reviewer="UNKNOWN" date="before2004/08/25" tests="tSSMStringHandler.cc">
// </reviewed>
 
// <prerequisite>
// # Classes you should understand before using this one.
//   <li> <linkto class=SSMBase>SSMBase</linkto>
//   <li> <linkto class=SSMDirColumn>SSMColumn</linkto>
//   <li> <linkto class=SSMStringHandler>SSMStringHandler</linkto>
// </prerequisite>
 
// <etymology>
// SSMIndStringColumn represents an Indirect String Array Column in the
// Standard Storage Manager.
// </etymology>
 
// <synopsis>
// SSMIndStringColumn handles indirect variable shaped string arrays.
// Note that indirect fixed shape string arrays are handled by
// <linkto class=SSMDirColumn>SSMDirColumn</linkto>.
// <p>
// All string array access is handled by class
// <linkto class=SSMStringHandler>SSMStringHandler</linkto>, so
// SSMIndStringColumn is merely an interface to this class.
// The only thing it does is accessing the bucketnr, offset, and length
// in the data bucket.
// </synopsis>
 
// <motivation>
// The reason that indirect string arrays are handled here instead of
// in <linkto class=SSMIndColumn>SSMIndColumn</linkto> is that the string
// buckets are more disk space efficient when string arrays are frequently
// updated.
// </motivation>
 
// # <todo asof="$DATE:$">
// # A List of bugs, limitations, extensions or planned refinements.
// # </todo>
 
class SSMIndStringColumn : public SSMDirColumn {
 public:
  // Create a SSMIndStringColumn object with the given parent.
  // It initializes the various variables.
  // It keeps the pointer to its parent (but does not own it).
  SSMIndStringColumn(SSMBase* aParent, int aDataType, uInt aColNr);
 
  virtual ~SSMIndStringColumn();
 
  // Forbid copy constructor.
  SSMIndStringColumn(const SSMIndStringColumn&) = delete;
 
  // Forbid assignment.
  SSMIndStringColumn& operator=(const SSMIndStringColumn&) = delete;
 
  // Get an array value in the given row.
  // An exception is thrown if no array is defined in this row.
  virtual void getArrayV(rownr_t rownr, ArrayBase& dataPtr);
 
  // Put an array value in the given row.
  virtual void putArrayV(rownr_t rownr, const ArrayBase& dataPtr);
 
  // Set the shape of the array in the given row.
  void setShape(rownr_t aRowNr, const IPosition& aShape);
 
  // Get the shape of the array in the given row.
  virtual IPosition shape(rownr_t aRowNr);
 
  // This storage manager can handle changing array shapes.
  Bool canChangeShape() const;
 
  // Is the shape defined (i.e. is there an array) in this row?
  virtual Bool isShapeDefined(rownr_t aRowNr);
 
  // Get the dimensionality of the item in the given row.
  virtual uInt ndim(rownr_t aRowNr);
};
 
}  // namespace casacore
 
#endif