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, 9 months ago) by tim
File size:	4037 byte(s)
Log Message:	refine factory pattern to make it initialized correctly
#	User	Rev	Content
1	tim	1740	/*
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	tim	1783	#include <iostream>
39	tim	1740	namespace oopse {
40
41			//forward declaration
42			class ForceField;
43	tim	1837	class ForceFieldCreator;
44	tim	1740	/**
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	tim	1837
51			typedef std::map<std::string, ForceFieldCreator*> CreatorMapType;
52	tim	1740	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	tim	1824	static ForceFieldFactory* getInstance() {
60	tim	1740
61	tim	1824	if (instance_ == NULL) {
62			instance_ = new ForceFieldFactory();
63			}
64			return instance_;
65
66			}
67
68	tim	1740	/**
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	tim	1837	bool registerForceField(ForceFieldCreator* creator);
75	tim	1740
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