24 |
|
*/ |
25 |
|
|
26 |
|
/** |
27 |
< |
* @file Vector3.hpp |
27 |
> |
* @file GenericFactory.hpp |
28 |
|
* @author Teng Lin |
29 |
< |
* @date 09/14/2004 |
29 |
> |
* @date 10/24/2004 |
30 |
|
* @version 1.0 |
31 |
|
*/ |
32 |
|
#ifndef UTIL_GENERICFACTORY_HPP |
33 |
|
#define UTIL_GENERICFACTORY_HPP |
34 |
+ |
#include <cassert> |
35 |
|
#include <map> |
36 |
|
#include <string> |
37 |
+ |
#include <vector> |
38 |
|
|
39 |
< |
template<class Product, typename Creator, typename ProductIdentType = std::string> |
40 |
< |
class GenericFactory{ |
39 |
> |
namespace oopse { |
40 |
> |
|
41 |
> |
/** |
42 |
> |
* @class GenericFactory GenericFactory.hpp "utils/GenericFactory.hpp" |
43 |
> |
* @brief GenericFactory is a template based Object Factory |
44 |
> |
* Factory pattern is used to define an interface for creating an object. |
45 |
> |
* |
46 |
> |
* @param Object the base class of the hierarchy for which you provide the object factory. |
47 |
> |
* @param IdentType the object that identifies the type of the concrete object. Default type is string |
48 |
> |
* @param Creator the callable entity that creates objects. This type must support operator(), |
49 |
> |
* taking no parameters and returning a pointer to Object. Default type is function pointer. |
50 |
> |
* |
51 |
> |
* Usage: |
52 |
> |
* @code |
53 |
> |
* //Shape class |
54 |
> |
* class Shape { |
55 |
> |
* ... |
56 |
> |
* }; |
57 |
> |
* |
58 |
> |
* //instantiating a new object factory |
59 |
> |
* typedef GenericFactory<Shape> ShapeFactory; |
60 |
> |
* |
61 |
> |
* //Line class |
62 |
> |
* class Line : public Shape{ |
63 |
> |
* ... |
64 |
> |
* }; |
65 |
> |
* |
66 |
> |
* //declare function to create Line |
67 |
> |
* Shape* createLine() { |
68 |
> |
* return new Line; |
69 |
> |
* } |
70 |
> |
* |
71 |
> |
* //register createLine |
72 |
> |
* //note: must put ShapeFactory::getInstance()->registerCreator("Line", createLine) on the right |
73 |
> |
* //hand side, otherwise the compiler will consider it as a function declaration |
74 |
> |
* const bool registeredLine = ShapeFactory::getInstance()->registerCreator("Line", createLine); |
75 |
> |
* |
76 |
> |
* //Circle class |
77 |
> |
* class Circle : public Shape{ |
78 |
> |
* ... |
79 |
> |
* }; |
80 |
> |
* |
81 |
> |
* //declare function to create Circle |
82 |
> |
* Shape* createCircle() { |
83 |
> |
* return new Circle; |
84 |
> |
* } |
85 |
> |
* |
86 |
> |
* //register createCircle |
87 |
> |
* const bool registeredCircle = ShapeFactory::getInstance()->registerCreator("Circle", createCircle); |
88 |
> |
* |
89 |
> |
* //create object by ident |
90 |
> |
* Line* line = ShapeFactory::getInstance()->createObject("Line"); |
91 |
> |
* Circle* circle = ShapeFactory::getInstance()->createObject("Circle"); |
92 |
> |
* @endcode |
93 |
> |
* |
94 |
> |
* Or the user can use predefined macro DECLARE_CREATOR and REGISTER_CREATOR |
95 |
> |
* @code |
96 |
> |
* //Shape class |
97 |
> |
* class Shape { |
98 |
> |
* ... |
99 |
> |
* }; |
100 |
> |
* |
101 |
> |
* //instantiating a new object factory |
102 |
> |
* typedef GenericFactory<Shape> ShapeFactory; |
103 |
> |
* |
104 |
> |
* //Line class |
105 |
> |
* class Line : public Shape{ |
106 |
> |
* ... |
107 |
> |
* }; |
108 |
> |
* |
109 |
> |
* //declare function using macro |
110 |
> |
* DECLARE_CREATOR(Shape, Line) |
111 |
> |
* |
112 |
> |
* //register using macro |
113 |
> |
* REGISTER_CREATOR(ShapeFactory, "Line", Line); |
114 |
> |
|
115 |
> |
* //Circle class |
116 |
> |
* class Circle : public Shape{ |
117 |
> |
* ... |
118 |
> |
* }; |
119 |
> |
* |
120 |
> |
* //declare function using macro |
121 |
> |
* DECLARE_CREATOR(Shape, Circle) |
122 |
> |
* |
123 |
> |
* //register using macro |
124 |
> |
* REGISTER_CREATOR(ShapeFactory, "Circle", Circle); |
125 |
> |
* @endcode |
126 |
> |
*/ |
127 |
> |
template<class Object, typename IdentType = std::string, typename Creator = Object* (*)()> |
128 |
> |
class GenericFactory { |
129 |
|
public: |
130 |
+ |
typedef GenericFactory<Object, IdentType, Creator> FactoryType; |
131 |
+ |
typedef std::map<IdentType, Creator> CreatorMapType; |
132 |
|
|
133 |
< |
typedef map<ProductIdentType, Creator*> CreatorMapType; |
134 |
< |
~GenericFactory(); |
133 |
> |
/** |
134 |
> |
* Returns an instance of object factory |
135 |
> |
* @return an instance of object factory |
136 |
> |
*/ |
137 |
> |
static FactoryType* getInstance(){ |
138 |
> |
if (instance_ == NULL) |
139 |
> |
instance_ = new FactoryType; |
140 |
> |
return instance_; |
141 |
> |
} |
142 |
|
|
143 |
< |
static GenericFactory* getInstance(); |
143 |
> |
/** |
144 |
> |
* Registers a creator with a type identifier |
145 |
> |
* @return true if registration is succeed, otherwise return false |
146 |
> |
* @id the identification of the concrete object |
147 |
> |
* @creator the object responsible to create the concrete object |
148 |
> |
*/ |
149 |
> |
bool registerCreator(const IdentType& id, Creator creator) { |
150 |
> |
return creatorMap_.insert( |
151 |
> |
CreatorMapType::value_type(id, creator)).second; |
152 |
> |
} |
153 |
|
|
154 |
< |
bool register(CreatorType* creator); |
154 |
> |
/** |
155 |
> |
* Unregisters the creator for the given type identifier. If the type identifier |
156 |
> |
* was previously registered, the function returns true. |
157 |
> |
* @return truethe type identifier was previously registered and the creator is removed, |
158 |
> |
* otherwise return false |
159 |
> |
* @id the identification of the concrete object |
160 |
> |
*/ |
161 |
> |
bool unregisterCreator(const IdentType& id) { |
162 |
> |
return creatorMap_.erase(id) == 1; |
163 |
> |
} |
164 |
|
|
165 |
< |
bool unregister(); |
166 |
< |
|
167 |
< |
bool hasCreator( const ProductIdentType& id ); |
165 |
> |
/** |
166 |
> |
* Looks up the type identifier in the internal map. If it is found, it invokes the |
167 |
> |
* corresponding creator for the type identifier and returns its result. |
168 |
> |
* @return a pointer of the concrete object, return NULL if no creator is registed for |
169 |
> |
* creating this concrete object |
170 |
> |
* @param id the identification of the concrete object |
171 |
> |
*/ |
172 |
> |
Object* createObject(const IdentType& id) { |
173 |
> |
typename CreatorMapType::iterator i = creatorMap_.find(id); |
174 |
> |
if (i != creatorMap_.end()) { |
175 |
> |
//invoke functor to create object |
176 |
> |
return (i->second)(); |
177 |
> |
} else { |
178 |
> |
return NULL; |
179 |
> |
} |
180 |
> |
} |
181 |
|
|
182 |
< |
const std::string toString(); |
182 |
> |
/** |
183 |
> |
* Returns all of the registed type identifiers |
184 |
> |
* @return all of the registed type identifiers |
185 |
> |
*/ |
186 |
> |
std::vector<IdentType> getIdents() { |
187 |
> |
std::vector<IdentType> idents; |
188 |
> |
typename CreatorMapType::iterator i; |
189 |
|
|
190 |
< |
Product* createProduct( const ProductIdentType& id ); |
191 |
< |
|
192 |
< |
private: |
193 |
< |
GenericFactory(){} |
194 |
< |
static GenericFactory* instance_; |
195 |
< |
map<string, Creator*> creatorMap_; |
190 |
> |
for (i = creatorMap_.begin(); i != creatorMap_.end(); ++i) { |
191 |
> |
idents.push_back(i->first); |
192 |
> |
} |
193 |
> |
|
194 |
> |
return idents; |
195 |
> |
} |
196 |
> |
|
197 |
> |
public: |
198 |
> |
static FactoryType* instance_; |
199 |
> |
CreatorMapType creatorMap_; |
200 |
|
}; |
201 |
|
|
202 |
< |
typedef GenericFactory<ForceFieldParser, > ForceFiledParserFactory; |
203 |
< |
#endif |
202 |
> |
/** write out all of the type identifier to a output stream */ |
203 |
> |
template<typename O, typename I, typename C> |
204 |
> |
std::ostream& operator <<(std::ostream& o, GenericFactory<O, I, C>& factory) { |
205 |
> |
std::vector<I> idents; |
206 |
> |
std::vector<I>::iterator i; |
207 |
|
|
208 |
+ |
idents = factory.getIdents(); |
209 |
+ |
|
210 |
+ |
o << "Avaliable type identifiers in this factory: " << std::endl; |
211 |
+ |
for (i = idents.begin(); i != idents.end(); ++i) { |
212 |
+ |
o << *i << std::endl; |
213 |
+ |
} |
214 |
+ |
|
215 |
+ |
return o; |
216 |
+ |
} |
217 |
+ |
|
218 |
+ |
//static template class member |
219 |
+ |
template<class Object, typename IdentType,typename Creator> |
220 |
+ |
GenericFactory<Object,IdentType,Creator>* GenericFactory<Object,IdentType,Creator>::instance_ ; |
221 |
+ |
|
222 |
+ |
|
223 |
+ |
#define DECLARE_CREATOR(abstractObject, concreteObject) \ |
224 |
+ |
inline abstractObject* create##concreteObject(){\ |
225 |
+ |
return new concreteObject;\ |
226 |
+ |
} |
227 |
+ |
|
228 |
+ |
#define REGISTER_CREATOR(factory, ident, concreteObject) \ |
229 |
+ |
const bool registered##concreteObject = factory::getInstance()->registerCreator(ident, create##concreteObject); |
230 |
+ |
|
231 |
+ |
|
232 |
+ |
}//namespace oopse |
233 |
+ |
#endif //UTIL_GENERICFACTORY_HPP |
234 |
+ |
|