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root/OpenMD/trunk/src/utils/GenericFactory.hpp
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Comparing trunk/src/utils/GenericFactory.hpp (file contents):
Revision 149 by tim, Mon Oct 25 04:08:14 2004 UTC vs.
Revision 246 by gezelter, Wed Jan 12 22:41:40 2005 UTC

# Line 1 | Line 1
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.
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 <
41 >
42   /**
43   * @file GenericFactory.hpp
44   * @author Teng Lin
# Line 31 | Line 47
47   */
48   #ifndef UTIL_GENERICFACTORY_HPP
49   #define UTIL_GENERICFACTORY_HPP
50 + #include <cassert>
51   #include <map>
52   #include <string>
53   #include <vector>
# Line 43 | Line 60 | namespace oopse {
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 string
47 < * @param Creator  the callable entity that creates objects. This type must support operator(),
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 {
# Line 67 | Line 84 | namespace oopse {
84   * }
85   *
86   * //register createLine
87 < * ShapeFactory::getInstance()->registerCreator("Line", 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{
# Line 80 | Line 99 | namespace oopse {
99   * }
100   *
101   * //register createCircle
102 < * ShapeFactory::getInstance()->registerCreator("Circle", 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 {
# Line 135 | Line 187 | class GenericFactory {
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;
# Line 161 | Line 214 | class GenericFactory {
214          CreatorMapType creatorMap_;
215   };
216  
217 < /** write out all of the type identifier to a output stream */
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;
# Line 181 | Line 234 | GenericFactory<Object,IdentType,Creator>* GenericFacto
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 <    abstractObject* create##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  

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