src/utils/GenericFactory.hpp

 /*
 * Copyright (c) 2005 The University of Notre Dame. All Rights Reserved.
 *
 * The University of Notre Dame grants you ("Licensee") a
 * non-exclusive, royalty free, license to use, modify and
 * redistribute this software in source and binary code form, provided
 * that the following conditions are met:
 *
 * 1. Acknowledgement of the program authors must be made in any
 *    publication of scientific results based in part on use of the
 *    program.  An acceptable form of acknowledgement is citation of
 *    the article in which the program was described (Matthew
 *    A. Meineke, Charles F. Vardeman II, Teng Lin, Christopher
 *    J. Fennell and J. Daniel Gezelter, "OOPSE: An Object-Oriented
 *    Parallel Simulation Engine for Molecular Dynamics,"
 *    J. Comput. Chem. 26, pp. 252-271 (2005))
 *
 * 2. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 3. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the
 *    distribution.
 *
 * This software is provided "AS IS," without a warranty of any
 * kind. All express or implied conditions, representations and
 * warranties, including any implied warranty of merchantability,
 * fitness for a particular purpose or non-infringement, are hereby
 * excluded.  The University of Notre Dame and its licensors shall not
 * be liable for any damages suffered by licensee as a result of
 * using, modifying or distributing the software or its
 * derivatives. In no event will the University of Notre Dame or its
 * licensors be liable for any lost revenue, profit or data, or for
 * direct, indirect, special, consequential, incidental or punitive
 * damages, however caused and regardless of the theory of liability,
 * arising out of the use of or inability to use software, even if the
 * University of Notre Dame has been advised of the possibility of
 * such damages.
 */
 
/**
 * @file GenericFactory.hpp
 * @author Teng Lin
 * @date 10/24/2004
 * @version 1.0
 */
#ifndef UTIL_GENERICFACTORY_HPP
#define UTIL_GENERICFACTORY_HPP
#include <cassert>
#include <map>
#include <string>
#include <vector>

namespace oopse {

/**
 * @class GenericFactory GenericFactory.hpp "utils/GenericFactory.hpp"
 * @brief GenericFactory is a template based Object Factory 
 * Factory pattern is used to define an interface for creating an object.
 * 
 * @param Object the base class of the hierarchy for which you provide the object factory.
 * @param IdentType the object that identifies the type of the concrete object. Default type is  std::string * @param Creator  the callable entity that creates objects. This type must support operator(),
 * taking no parameters and returning a pointer to Object. Default type is function pointer.
 *
 * Usage:
 * @code
 * //Shape class
 * class Shape {
 * ...
 * };
 * 
 * //instantiating a new object factory
 * typedef GenericFactory<Shape> ShapeFactory;
 *
 * //Line class
 * class Line : public Shape{
 * ...
 * };
 *
 * //declare function to create Line
 * Shape* createLine() {
 *   return new Line;
 * }
 *
 * //register createLine
 * //note: must put ShapeFactory::getInstance()->registerCreator("Line", createLine) on the right
 * //hand side, otherwise the compiler will consider it as a function declaration
 * const bool registeredLine = ShapeFactory::getInstance()->registerCreator("Line", createLine);
 *
 * //Circle class
 * class Circle : public Shape{
 * ...
 * };
 *
 * //declare function to create Circle
 * Shape* createCircle() { 
 *   return new Circle;
 * }
 *
 * //register createCircle
 * const bool registeredCircle = ShapeFactory::getInstance()->registerCreator("Circle", createCircle); 
 *
 * //create object by ident
 * Line* line = ShapeFactory::getInstance()->createObject("Line");
 * Circle* circle = ShapeFactory::getInstance()->createObject("Circle"); 
 * @endcode
 *
 * Or the user can use predefined macro DECLARE_CREATOR and REGISTER_CREATOR
 * @code
 * //Shape class
 * class Shape {
 * ...
 * };
 * 
 * //instantiating a new object factory
 * typedef GenericFactory<Shape> ShapeFactory;
 *
 * //Line class
 * class Line : public Shape{
 * ...
 * };
 *
 * //declare function using macro 
 * DECLARE_CREATOR(Shape, Line)
 * 
 * //register using macro
 * REGISTER_CREATOR(ShapeFactory, "Line", Line);
 
 * //Circle class
 * class Circle : public Shape{
 * ...
 * };
 *
 * //declare function using macro 
 * DECLARE_CREATOR(Shape, Circle)
 * 
 * //register using macro
 * REGISTER_CREATOR(ShapeFactory, "Circle", Circle);
 * @endcode
 */
template<class Object, typename IdentType = std::string, typename Creator = Object* (*)()>
class GenericFactory {
    public:
        typedef GenericFactory<Object, IdentType, Creator> FactoryType;
        typedef std::map<IdentType, Creator> CreatorMapType;
        
        /**
         * Returns an instance of object factory
         * @return an instance of object factory
         */        
        static FactoryType* getInstance(){
            if (instance_ == NULL)
                instance_ = new FactoryType;
            return instance_;
        }

        /**
         * Registers a creator with a type identifier
         * @return true if registration is succeed, otherwise return false
         * @id the identification of the concrete object
         * @creator the object responsible to create the concrete object 
         */
        bool registerCreator(const IdentType& id, Creator creator) {
            return creatorMap_.insert(
                CreatorMapType::value_type(id, creator)).second;
        }

        /**
         * Unregisters the creator for the given type identifier. If the type identifier 
         * was previously registered, the function returns true.
         * @return truethe type identifier was previously registered and the creator is removed,
         * otherwise return false
         * @id the identification of the concrete object
         */
        bool unregisterCreator(const IdentType& id) {
            return creatorMap_.erase(id) == 1;
        }

        /**
         * Looks up the type identifier in the internal map. If it is found, it invokes the
         * corresponding creator for the type identifier and returns its result. 
         * @return a pointer of the concrete object, return NULL if no creator is registed for 
         * creating this concrete object
         * @param id the identification of the concrete object
         */
        Object* createObject(const IdentType& id) {
            typename CreatorMapType::iterator i = creatorMap_.find(id);
            if (i != creatorMap_.end()) {
                //invoke functor to create object
                return (i->second)();
            } else {
                return NULL;
            }
        }

        /** 
         *  Returns all of the registed  type identifiers
         * @return all of the registed  type identifiers
         */
        std::vector<IdentType> getIdents() {
            std::vector<IdentType> idents;
            typename CreatorMapType::iterator i;

            for (i = creatorMap_.begin(); i != creatorMap_.end(); ++i) {
                idents.push_back(i->first);
            }
            
            return idents;
        }

    public:
        static FactoryType* instance_;
        CreatorMapType creatorMap_;
};

/** write out all of the type identifiers to an output stream */
template<typename O, typename I, typename C>
std::ostream& operator <<(std::ostream& o, GenericFactory<O, I, C>& factory) {
    std::vector<I> idents;
    std::vector<I>::iterator i;

    idents = factory.getIdents();

    o << "Avaliable type identifiers in this factory: " << std::endl;
    for (i = idents.begin(); i != idents.end(); ++i) {
        o << *i << std::endl;
    }

    return o;
}

//static template class member
template<class Object, typename IdentType,typename Creator>
GenericFactory<Object,IdentType,Creator>* GenericFactory<Object,IdentType,Creator>::instance_ ; 


#define DECLARE_CREATOR(abstractObject, concreteObject) \
    inline abstractObject* create##concreteObject(){\
        return new concreteObject;\
    }

#define REGISTER_CREATOR(factory, ident, concreteObject) \
        const bool registered##concreteObject = factory::getInstance()->registerCreator(ident, create##concreteObject); 


}//namespace oopse
#endif //UTIL_GENERICFACTORY_HPP

Revision:	1930
Committed:	Wed Jan 12 22:41:40 2005 UTC (19 years, 5 months ago) by gezelter
File size:	8531 byte(s)
Log Message:	merging new_design branch into OOPSE-2.0
#	Content
1	/*
2	* Copyright (c) 2005 The University of Notre Dame. All Rights Reserved.
3	*
4	* The University of Notre Dame grants you ("Licensee") a
5	* non-exclusive, royalty free, license to use, modify and
6	* redistribute this software in source and binary code form, provided
7	* that the following conditions are met:
8	*
9	* 1. Acknowledgement of the program authors must be made in any
10	* publication of scientific results based in part on use of the
11	* program. An acceptable form of acknowledgement is citation of
12	* the article in which the program was described (Matthew
13	* A. Meineke, Charles F. Vardeman II, Teng Lin, Christopher
14	* J. Fennell and J. Daniel Gezelter, "OOPSE: An Object-Oriented
15	* Parallel Simulation Engine for Molecular Dynamics,"
16	* J. Comput. Chem. 26, pp. 252-271 (2005))
17	*
18	* 2. Redistributions of source code must retain the above copyright
19	* notice, this list of conditions and the following disclaimer.
20	*
21	* 3. Redistributions in binary form must reproduce the above copyright
22	* notice, this list of conditions and the following disclaimer in the
23	* documentation and/or other materials provided with the
24	* distribution.
25	*
26	* This software is provided "AS IS," without a warranty of any
27	* kind. All express or implied conditions, representations and
28	* warranties, including any implied warranty of merchantability,
29	* fitness for a particular purpose or non-infringement, are hereby
30	* excluded. The University of Notre Dame and its licensors shall not
31	* be liable for any damages suffered by licensee as a result of
32	* using, modifying or distributing the software or its
33	* derivatives. In no event will the University of Notre Dame or its
34	* licensors be liable for any lost revenue, profit or data, or for
35	* direct, indirect, special, consequential, incidental or punitive
36	* damages, however caused and regardless of the theory of liability,
37	* arising out of the use of or inability to use software, even if the
38	* University of Notre Dame has been advised of the possibility of
39	* such damages.
40	*/
41
42	/**
43	* @file GenericFactory.hpp
44	* @author Teng Lin
45	* @date 10/24/2004
46	* @version 1.0
47	*/
48	#ifndef UTIL_GENERICFACTORY_HPP
49	#define UTIL_GENERICFACTORY_HPP
50	#include <cassert>
51	#include <map>
52	#include <string>
53	#include <vector>
54
55	namespace oopse {
56
57	/**
58	* @class GenericFactory GenericFactory.hpp "utils/GenericFactory.hpp"
59	* @brief GenericFactory is a template based Object Factory
60	* Factory pattern is used to define an interface for creating an object.
61	*
62	* @param Object the base class of the hierarchy for which you provide the object factory.
63	* @param IdentType the object that identifies the type of the concrete object. Default type is std::string * @param Creator the callable entity that creates objects. This type must support operator(),
64	* taking no parameters and returning a pointer to Object. Default type is function pointer.
65	*
66	* Usage:
67	* @code
68	* //Shape class
69	* class Shape {
70	* ...
71	* };
72	*
73	* //instantiating a new object factory
74	* typedef GenericFactory<Shape> ShapeFactory;
75	*
76	* //Line class
77	* class Line : public Shape{
78	* ...
79	* };
80	*
81	* //declare function to create Line
82	* Shape* createLine() {
83	* return new Line;
84	* }
85	*
86	* //register createLine
87	* //note: must put ShapeFactory::getInstance()->registerCreator("Line", createLine) on the right
88	* //hand side, otherwise the compiler will consider it as a function declaration
89	* const bool registeredLine = ShapeFactory::getInstance()->registerCreator("Line", createLine);
90	*
91	* //Circle class
92	* class Circle : public Shape{
93	* ...
94	* };
95	*
96	* //declare function to create Circle
97	* Shape* createCircle() {
98	* return new Circle;
99	* }
100	*
101	* //register createCircle
102	* const bool registeredCircle = ShapeFactory::getInstance()->registerCreator("Circle", createCircle);
103	*
104	* //create object by ident
105	* Line* line = ShapeFactory::getInstance()->createObject("Line");
106	* Circle* circle = ShapeFactory::getInstance()->createObject("Circle");
107	* @endcode
108	*
109	* Or the user can use predefined macro DECLARE_CREATOR and REGISTER_CREATOR
110	* @code
111	* //Shape class
112	* class Shape {
113	* ...
114	* };
115	*
116	* //instantiating a new object factory
117	* typedef GenericFactory<Shape> ShapeFactory;
118	*
119	* //Line class
120	* class Line : public Shape{
121	* ...
122	* };
123	*
124	* //declare function using macro
125	* DECLARE_CREATOR(Shape, Line)
126	*
127	* //register using macro
128	* REGISTER_CREATOR(ShapeFactory, "Line", Line);
129
130	* //Circle class
131	* class Circle : public Shape{
132	* ...
133	* };
134	*
135	* //declare function using macro
136	* DECLARE_CREATOR(Shape, Circle)
137	*
138	* //register using macro
139	* REGISTER_CREATOR(ShapeFactory, "Circle", Circle);
140	* @endcode
141	*/
142	template<class Object, typename IdentType = std::string, typename Creator = Object* (*)()>
143	class GenericFactory {
144	public:
145	typedef GenericFactory<Object, IdentType, Creator> FactoryType;
146	typedef std::map<IdentType, Creator> CreatorMapType;
147
148	/**
149	* Returns an instance of object factory
150	* @return an instance of object factory
151	*/
152	static FactoryType* getInstance(){
153	if (instance_ == NULL)
154	instance_ = new FactoryType;
155	return instance_;
156	}
157
158	/**
159	* Registers a creator with a type identifier
160	* @return true if registration is succeed, otherwise return false
161	* @id the identification of the concrete object
162	* @creator the object responsible to create the concrete object
163	*/
164	bool registerCreator(const IdentType& id, Creator creator) {
165	return creatorMap_.insert(
166	CreatorMapType::value_type(id, creator)).second;
167	}
168
169	/**
170	* Unregisters the creator for the given type identifier. If the type identifier
171	* was previously registered, the function returns true.
172	* @return truethe type identifier was previously registered and the creator is removed,
173	* otherwise return false
174	* @id the identification of the concrete object
175	*/
176	bool unregisterCreator(const IdentType& id) {
177	return creatorMap_.erase(id) == 1;
178	}
179
180	/**
181	* Looks up the type identifier in the internal map. If it is found, it invokes the
182	* corresponding creator for the type identifier and returns its result.
183	* @return a pointer of the concrete object, return NULL if no creator is registed for
184	* creating this concrete object
185	* @param id the identification of the concrete object
186	*/
187	Object* createObject(const IdentType& id) {
188	typename CreatorMapType::iterator i = creatorMap_.find(id);
189	if (i != creatorMap_.end()) {
190	//invoke functor to create object
191	return (i->second)();
192	} else {
193	return NULL;
194	}
195	}
196
197	/**
198	* Returns all of the registed type identifiers
199	* @return all of the registed type identifiers
200	*/
201	std::vector<IdentType> getIdents() {
202	std::vector<IdentType> idents;
203	typename CreatorMapType::iterator i;
204
205	for (i = creatorMap_.begin(); i != creatorMap_.end(); ++i) {
206	idents.push_back(i->first);
207	}
208
209	return idents;
210	}
211
212	public:
213	static FactoryType* instance_;
214	CreatorMapType creatorMap_;
215	};
216
217	/** write out all of the type identifiers to an output stream */
218	template<typename O, typename I, typename C>
219	std::ostream& operator <<(std::ostream& o, GenericFactory<O, I, C>& factory) {
220	std::vector<I> idents;
221	std::vector<I>::iterator i;
222
223	idents = factory.getIdents();
224
225	o << "Avaliable type identifiers in this factory: " << std::endl;
226	for (i = idents.begin(); i != idents.end(); ++i) {
227	o << *i << std::endl;
228	}
229
230	return o;
231	}
232
233	//static template class member
234	template<class Object, typename IdentType,typename Creator>
235	GenericFactory<Object,IdentType,Creator>* GenericFactory<Object,IdentType,Creator>::instance_ ;
236
237
238	#define DECLARE_CREATOR(abstractObject, concreteObject) \
239	inline abstractObject* create##concreteObject(){\
240	return new concreteObject;\
241	}
242
243	#define REGISTER_CREATOR(factory, ident, concreteObject) \
244	const bool registered##concreteObject = factory::getInstance()->registerCreator(ident, create##concreteObject);
245
246
247	}//namespace oopse
248	#endif //UTIL_GENERICFACTORY_HPP
249