FunctionFactory.h

/*
Hyperspace Explorer - visualizing higher-dimensional geometry
Copyright (C) 2010  Lene Preuss <lene.preuss@gmail.com>

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

This program 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 General Public License for more details.

You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

*/

#ifndef FUNCTIONFACTORY_H
#define FUNCTIONFACTORY_H

#include "SingletonHolder.h"
#include "Displayable.h"

#include <map>

class Displayable;


class FunctionFactory {

  public:

    typedef Displayable *(*CreateFunctionCallback)();

    struct BadFunctionException: public std::runtime_error {
      BadFunctionException(const std::string &what):
        std::runtime_error("\""+what+"\" is not the name of a registered Function") { }
    };

  private:

    typedef std::map<std::string, CreateFunctionCallback> CallbackMap;

  public:

    bool registerFunction(CreateFunctionCallback creator,
                          const std::string &parent_category);

    bool unregisterFunction(const std::string &name);

    Displayable *createFunction(const std::string &name);

    std::vector<std::string> listFunctions();

  private:

    FunctionFactory(): callbacks() { }
    FunctionFactory(const FunctionFactory &);
    FunctionFactory &operator=(const FunctionFactory &);
    ~FunctionFactory();

    CallbackMap callbacks;  

  friend class Loki::CreateUsingNew<FunctionFactory>;

};

typedef Loki::SingletonHolder<FunctionFactory> TheFunctionFactory;

#endif