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>

namespace oopse {

//forward declaration
class ForceField;

/**
 * @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:

        /** a function pointer which has not parameter and return a pointer pointer to a ForceField instance*/
        typedef ForceField* (*ForceFieldCreatorType)();         
        
        typedef std::map<std::string, ForceFieldCreatorType> 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();

        /**
         * 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(const std::string& id, ForceFieldCreatorType 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:	1740
Committed:	Mon Nov 15 23:00:32 2004 UTC (19 years, 7 months ago) by tim
File size:	4033 byte(s)
Log Message:	adding ForceFieldFactory and LJFF classes
#	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
39	namespace oopse {
40
41	//forward declaration
42	class ForceField;
43
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	/** a function pointer which has not parameter and return a pointer pointer to a ForceField instance*/
52	typedef ForceField* (*ForceFieldCreatorType)();
53
54	typedef std::map<std::string, ForceFieldCreatorType> CreatorMapType;
55	typedef std::vector<std::string> IdentVectorType;
56	typedef std::vector<std::string>::iterator IdentVectorIterator;
57
58	/**
59	* Returns an instance of ForceField factory
60	* @return an instance of ForceField factory
61	*/
62	static ForceFieldFactory* getInstance();
63
64	/**
65	* Registers a creator with a type identifier
66	* @return true if registration is succeed, otherwise return false
67	* @id the identification of the concrete object
68	* @creator the object responsible to create the concrete object
69	*/
70	bool registerForceField(const std::string& id, ForceFieldCreatorType creator);
71
72	/**
73	* Unregisters the creator for the given type identifier. If the type identifier
74	* was previously registered, the function returns true.
75	* @return truethe type identifier was previously registered and the creator is removed,
76	* otherwise return false
77	* @id the identification of the concrete object
78	*/
79	bool unregisterForceField(const std::string& id);
80	/**
81	* Looks up the type identifier in the internal map. If it is found, it invokes the
82	* corresponding creator for the type identifier and returns its result.
83	* @return a pointer of the concrete object, return NULL if no creator is registed for
84	* creating this concrete object
85	* @param id the identification of the concrete object
86	*/
87	ForceField* createForceField(const std::string& id);
88
89	/**
90	* Returns all of the registed type identifiers
91	* @return all of the registed type identifiers
92	*/
93	IdentVectorType getIdents();
94
95	private:
96	static ForceFieldFactory* instance_;
97	CreatorMapType creatorMap_;
98	};
99
100	/** write out all of the type identifiers to an output stream */
101	std::ostream& operator <<(std::ostream& o, ForceFieldFactory& factory);
102
103	}//namespace oopse
104	#endif //USETHEFORCE_FORCEFIELDFACTORY_HPP