src/UseTheForce/ForceFieldFactory.hpp

/*
 * Copyright (C) 2000-2004  Object Oriented Parallel Simulation Engine (OOPSE) project
 * 
 * Contact: oopse@oopse.org
 * 
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public License
 * as published by the Free Software Foundation; either version 2.1
 * of the License, or (at your option) any later version.
 * All we ask is that proper credit is given for our work, which includes
 * - but is not limited to - adding the above copyright notice to the beginning
 * of your source code files, and to any copyright notice that you may distribute
 * with programs based on this work.
 * 
 * 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 Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 */

/**
 * @file ForceFieldFactory.hpp
 * @author Teng Lin
 * @date 10/24/2004
 * @version 1.0
 */
#ifndef USETHEFORCE_FORCEFIELDFACTORY_HPP
#define USETHEFORCE_FORCEFIELDFACTORY_HPP
#include <cassert>
#include <map>
#include <string>
#include <vector>
#include <iostream>
namespace oopse {

//forward declaration
class ForceField;
class ForceFieldCreator;
/**
 * @class ForceFieldFactory ForceFieldFactory.hpp "UseTheForce/ForceFieldFactory.hpp"
 * Factory pattern and Singleton Pattern are used to define an interface for creating an ForceField.
 */
class ForceFieldFactory {
    public:
                
        typedef std::map<std::string, ForceFieldCreator*> CreatorMapType;
        typedef std::vector<std::string> IdentVectorType;
        typedef std::vector<std::string>::iterator IdentVectorIterator;
                    
        /**
         * Returns an instance of ForceField factory
         * @return an instance of ForceField factory
         */        
        static ForceFieldFactory* getInstance() {

            if (instance_ == NULL) {
                instance_ = new ForceFieldFactory();
            }
            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 registerForceField(ForceFieldCreator* creator);

        /**
         * 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 unregisterForceField(const std::string& id);
        /**
         * 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
         */
        ForceField* createForceField(const std::string& id);

        /** 
         *  Returns all of the registed  type identifiers
         * @return all of the registed  type identifiers
         */
        IdentVectorType getIdents();
        
    private:
        static ForceFieldFactory* instance_;
        CreatorMapType creatorMap_;
};

/** write out all of the type identifiers to an output stream */
std::ostream& operator <<(std::ostream& o, ForceFieldFactory& factory);

}//namespace oopse
#endif //USETHEFORCE_FORCEFIELDFACTORY_HPP
Revision:	1837
Committed:	Thu Dec 2 22:15:31 2004 UTC (19 years, 7 months ago) by tim
File size:	4037 byte(s)
Log Message:	refine factory pattern to make it initialized correctly
#	Content
1	/*
2	* Copyright (C) 2000-2004 Object Oriented Parallel Simulation Engine (OOPSE) project
3	*
4	* Contact: oopse@oopse.org
5	*
6	* This program is free software; you can redistribute it and/or
7	* modify it under the terms of the GNU Lesser General Public License
8	* as published by the Free Software Foundation; either version 2.1
9	* of the License, or (at your option) any later version.
10	* All we ask is that proper credit is given for our work, which includes
11	* - but is not limited to - adding the above copyright notice to the beginning
12	* of your source code files, and to any copyright notice that you may distribute
13	* with programs based on this work.
14	*
15	* This program is distributed in the hope that it will be useful,
16	* but WITHOUT ANY WARRANTY; without even the implied warranty of
17	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18	* GNU Lesser General Public License for more details.
19	*
20	* You should have received a copy of the GNU Lesser General Public License
21	* along with this program; if not, write to the Free Software
22	* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
23	*
24	*/
25
26	/**
27	* @file ForceFieldFactory.hpp
28	* @author Teng Lin
29	* @date 10/24/2004
30	* @version 1.0
31	*/
32	#ifndef USETHEFORCE_FORCEFIELDFACTORY_HPP
33	#define USETHEFORCE_FORCEFIELDFACTORY_HPP
34	#include <cassert>
35	#include <map>
36	#include <string>
37	#include <vector>
38	#include <iostream>
39	namespace oopse {
40
41	//forward declaration
42	class ForceField;
43	class ForceFieldCreator;
44	/**
45	* @class ForceFieldFactory ForceFieldFactory.hpp "UseTheForce/ForceFieldFactory.hpp"
46	* Factory pattern and Singleton Pattern are used to define an interface for creating an ForceField.
47	*/
48	class ForceFieldFactory {
49	public:
50
51	typedef std::map<std::string, ForceFieldCreator*> CreatorMapType;
52	typedef std::vector<std::string> IdentVectorType;
53	typedef std::vector<std::string>::iterator IdentVectorIterator;
54
55	/**
56	* Returns an instance of ForceField factory
57	* @return an instance of ForceField factory
58	*/
59	static ForceFieldFactory* getInstance() {
60
61	if (instance_ == NULL) {
62	instance_ = new ForceFieldFactory();
63	}
64	return instance_;
65
66	}
67
68	/**
69	* Registers a creator with a type identifier
70	* @return true if registration is succeed, otherwise return false
71	* @id the identification of the concrete object
72	* @creator the object responsible to create the concrete object
73	*/
74	bool registerForceField(ForceFieldCreator* creator);
75
76	/**
77	* Unregisters the creator for the given type identifier. If the type identifier
78	* was previously registered, the function returns true.
79	* @return truethe type identifier was previously registered and the creator is removed,
80	* otherwise return false
81	* @id the identification of the concrete object
82	*/
83	bool unregisterForceField(const std::string& id);
84	/**
85	* Looks up the type identifier in the internal map. If it is found, it invokes the
86	* corresponding creator for the type identifier and returns its result.
87	* @return a pointer of the concrete object, return NULL if no creator is registed for
88	* creating this concrete object
89	* @param id the identification of the concrete object
90	*/
91	ForceField* createForceField(const std::string& id);
92
93	/**
94	* Returns all of the registed type identifiers
95	* @return all of the registed type identifiers
96	*/
97	IdentVectorType getIdents();
98
99	private:
100	static ForceFieldFactory* instance_;
101	CreatorMapType creatorMap_;
102	};
103
104	/** write out all of the type identifiers to an output stream */
105	std::ostream& operator <<(std::ostream& o, ForceFieldFactory& factory);
106
107	}//namespace oopse
108	#endif //USETHEFORCE_FORCEFIELDFACTORY_HPP