factory.h

//
// Copyright (c) 2014 Limit Point Systems, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//

// Interface for class factory

#ifndef FACTORY_H
#define FACTORY_H

#ifndef SHEAF_DLL_SPEC_H
#include "SheafSystem/sheaf_dll_spec.h"
#endif

#ifndef STD_IOSTREAM_H
#include "SheafSystem/std_iostream.h"
#endif

#ifndef STD_MAP_H
#include "SheafSystem/std_map.h"
#endif

#ifndef STD_STRING_H
#include "SheafSystem/std_string.h"
#endif

namespace sheaf
{

class namespace_poset;
  
// Forward declarations to enable friend declaration.

template <typename T>
class factory;

template <typename T>
std::ostream& operator << (std::ostream &os, const factory<T>& xf);


template <typename T>
class factory
{
  friend std::ostream& operator << <T> (std::ostream& xos, const factory<T>& xf);

public:

  // ===========================================================
  // FACTORY FACET
  // ===========================================================

  factory();

  virtual ~factory();

  T* new_instance(const std::string& xclient_class_name);

  template<typename S>
  T* new_instance(const std::string& xclient_class_name, S& xarg);

  void insert_prototype(T* xprototype);

  void delete_prototype(const std::string& xclass_name);

  bool contains_prototype(const std::string& xclass_name) const;

private:

  factory(const factory& xother);

  typedef std::map<std::string, T*> prototypes_map_type;

  prototypes_map_type _prototypes_map;
};

// ===========================================================
// NON-MEMBER FUNCTIONS
// ===========================================================

template <typename T>
std::ostream& operator << (std::ostream& xos, const factory<T>& xf);
 
} // namespace sheaf

#endif // ifndef FACTORY_H