EclecticFunctionFactory.h

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// # EclecticFunctionFactory.cc: a class for creating various Function objects from Records
// # Copyright (C) 2002
// # 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 SCIMATH_ECLECTICFUNCTIONFACTORY_H
#define SCIMATH_ECLECTICFUNCTIONFACTORY_H
 
#include <casacore/casa/aips.h>
#include <casacore/scimath/Functionals/Function.h>
#include <casacore/casa/Containers/OrderedMap.h>
#include <casacore/casa/Containers/OrderedPair.h>
#include <casacore/casa/Exceptions/Error.h>
#include <casacore/scimath/Functionals/AbstractFunctionFactory.h>
 
namespace casacore {  // # NAMESPACE CASACORE - BEGIN
 
// # Forward Declarations
 
class Record;
 
// <summary>
//
//
//
//
//
// </summary>
 
// <use visibility=export>
 
// <reviewed reviewer="" date="yyyy/mm/dd" tests="" demos="">
// </reviewed>
 
// <prerequisite>
//   <li> FunctionFactory
// </prerequisite>
//
// <etymology>
// This class is based on the Factory pattern, similar to the
// ApplicationObjectFactory
// </etymology>
//
// <synopsis>
//
//
//
//
// </synopsis>
//
// <example>
//
//
//
// </example>
//
// <motivation>
//
//
//
// </motivation>
//
// <templating arg=T>
//    <li> Function must have a constructor for the form T(const Record&)
// </templating>
//
// <thrown>
//    <li> UnrecognizedFunctionError by create() if the Record field
//         "functype" does not match a Function added via addFactory()
//    <li> InvalidSerializationError by create() if
//         <ul>
//            <li> Record does not contain a "functype" field containing
//                 a string
//            <li> the associated specific factory throws an
//                 InvalidSerializationError
//         </ul>
// </thrown>
//
// <todo asof="yyyy/mm/dd">
//   <li>
//   <li>
//   <li>
// </todo>
 
template <class T>
class EclecticFunctionFactory : public FunctionFactory<T> {
 public:
  // create an empty EclecticFunctionFactory
  EclecticFunctionFactory();
 
  // create a shallow copy of another EclecticFunctionFactory
  EclecticFunctionFactory(const EclecticFunctionFactory& factory);
 
  // delete this EclecticFunctionFactory.  Those specific factories added
  // via addFactory() with <em>own=True</em> will be deleted.
  virtual ~EclecticFunctionFactory();
 
  // create the Function object described in the given Record.  This
  // implementation will use the value of the "functype" field to lookup
  // the specific factory to use to create the function.  That is, the
  // the "functype" value will be matched against the type names loaded
  // via addFactory().
  virtual Function<T>* create(const Record&) const throw(FunctionFactoryError);
 
  // add a factory for creating a specific type of function, associating
  // it with a given "functype" name.
  void addFactory(const String& type, FunctionFactory<T>* factory, Bool own = True);
 
  // return the number of factories that have been loaded thus far.
  Int ndefined() { return lookup.ndefined(); }
 
  // return True if a factory with a given "functype" name has been
  // loaded.
  Bool isDefined(const String& type) { return lookup.isDefined(type); }
 
  // a shallow assignment operator
  EclecticFunctionFactory& operator=(const EclecticFunctionFactory& factory);
 
 protected:
 private:
  OrderedMap<String, OrderedPair<FunctionFactory<T>*, Bool>> lookup;
};
 
}  // namespace casacore
 
#ifndef CASACORE_NO_AUTO_TEMPLATES
#include <casacore/scimath/Functionals/EclecticFunctionFactory.tcc>
#endif  // # CASACORE_NO_AUTO_TEMPLATES
#endif