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}; |
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\end{lstlisting} |
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The corresponding implementation is |
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< |
\begin{lstlisting}[float,caption={[A classic Singleton design pattern implementation(II)] Implementation of {\tt IntegratorFactory} class.},label={appendixScheme:singletonImplementation}] |
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> |
\begin{lstlisting}[float,caption={[A classic implementation of Singleton design pattern (II)] Implementation of {\tt IntegratorFactory} class.},label={appendixScheme:singletonImplementation}] |
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|
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IntegratorFactory::instance_ = NULL; |
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|
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with the problem of creating objects without specifying the exact |
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class of object that will be created. Factory Method is typically |
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implemented by delegating the creation operation to the subclasses. |
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< |
\begin{lstlisting}[float,caption={[].},label={appendixScheme:factoryDeclaration}] |
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> |
|
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> |
Registers a creator with a type identifier. Looks up the type |
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> |
identifier in the internal map. If it is found, it invokes the |
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> |
corresponding creator for the type identifier and returns its |
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> |
result. |
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> |
\begin{lstlisting}[float,caption={[The implementation of Factory pattern (I)].},label={appendixScheme:factoryDeclaration}] |
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class IntegratorCreator; |
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class IntegratorFactory { |
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public: |
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< |
typedef std::map<std::string, IntegratorCreator*> CreatorMapType; |
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> |
typedef std::map<string, IntegratorCreator*> CreatorMapType; |
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|
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– |
/** |
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– |
* Registers a creator with a type identifier |
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– |
* @return true if registration is successful, otherwise return false |
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– |
* @id the identification of the concrete object |
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– |
* @creator the object responsible to create the concrete object |
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– |
*/ |
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|
bool registerIntegrator(IntegratorCreator* creator); |
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|
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< |
/** |
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< |
* Looks up the type identifier in the internal map. If it is found, it invokes the |
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< |
* corresponding creator for the type identifier and returns its result. |
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< |
* @return a pointer of the concrete object, return NULL if no creator is registed for |
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< |
* creating this concrete object |
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< |
* @param id the identification of the concrete object |
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< |
*/ |
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< |
Integrator* createIntegrator(const std::string& id, SimInfo* info); |
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> |
Integrator* createIntegrator(const string& id, SimInfo* info); |
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|
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private: |
| 185 |
|
CreatorMapType creatorMap_; |
| 186 |
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}; |
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|
\end{lstlisting} |
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|
| 189 |
< |
\begin{lstlisting}[float,caption={[].},label={appendixScheme:factoryDeclarationImplementation}] |
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< |
bool IntegratorFactory::unregisterIntegrator(const std::string& id) { |
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> |
\begin{lstlisting}[float,caption={[The implementation of Factory pattern (II)].},label={appendixScheme:factoryDeclarationImplementation}] |
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> |
bool IntegratorFactory::unregisterIntegrator(const string& id) { |
| 191 |
|
return creatorMap_.erase(id) == 1; |
| 192 |
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} |
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|
| 194 |
< |
Integrator* IntegratorFactory::createIntegrator(const std::string& id, SimInfo* info) { |
| 194 |
> |
Integrator* |
| 195 |
> |
IntegratorFactory::createIntegrator(const string& id, SimInfo* info) { |
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|
CreatorMapType::iterator i = creatorMap_.find(id); |
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if (i != creatorMap_.end()) { |
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//invoke functor to create object |
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} |
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\end{lstlisting} |
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|
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< |
\begin{lstlisting}[float,caption={[].},label={appendixScheme:integratorCreator}] |
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> |
\begin{lstlisting}[float,caption={[The implementation of Factory pattern (III)].},label={appendixScheme:integratorCreator}] |
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|
| 208 |
|
class IntegratorCreator { |
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public: |
| 210 |
< |
IntegratorCreator(const std::string& ident) : ident_(ident) {} |
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< |
virtual ~IntegratorCreator() {} |
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< |
const std::string& getIdent() const { return ident_; } |
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> |
IntegratorCreator(const string& ident) : ident_(ident) {} |
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|
|
| 212 |
+ |
const string& getIdent() const { return ident_; } |
| 213 |
+ |
|
| 214 |
|
virtual Integrator* create(SimInfo* info) const = 0; |
| 215 |
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|
| 216 |
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private: |
| 217 |
< |
std::string ident_; |
| 217 |
> |
string ident_; |
| 218 |
|
}; |
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|
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template<class ConcreteIntegrator> |
| 221 |
|
class IntegratorBuilder : public IntegratorCreator { |
| 222 |
|
public: |
| 223 |
< |
IntegratorBuilder(const std::string& ident) : IntegratorCreator(ident) {} |
| 224 |
< |
virtual Integrator* create(SimInfo* info) const {return new ConcreteIntegrator(info);} |
| 223 |
> |
IntegratorBuilder(const string& ident) : IntegratorCreator(ident) {} |
| 224 |
> |
virtual Integrator* create(SimInfo* info) const { |
| 225 |
> |
return new ConcreteIntegrator(info); |
| 226 |
> |
} |
| 227 |
|
}; |
| 228 |
|
\end{lstlisting} |
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|
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|
\subsection{\label{appendixSection:visitorPattern}Visitor} |
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|
| 232 |
|
The purpose of the Visitor Pattern is to encapsulate an operation |
| 233 |
< |
that you want to perform on the elements of a data structure. In |
| 234 |
< |
this way, you can change the operation being performed on a |
| 235 |
< |
structure without the need of changing the class heirarchy of the |
| 236 |
< |
elements that you are operating on. |
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> |
that you want to perform on the elements. The operation being |
| 234 |
> |
performed on a structure can be switched without changing the |
| 235 |
> |
interfaces of the elements. In other words, one can add virtual |
| 236 |
> |
functions into a set of classes without modifying their interfaces. |
| 237 |
> |
The UML class diagram of Visitor patten is shown in |
| 238 |
> |
Fig.~\ref{appendixFig:visitorUML}. {\tt Dump2XYZ} program in |
| 239 |
> |
Sec.~\ref{appendixSection:Dump2XYZ} uses Visitor pattern |
| 240 |
> |
extensively. |
| 241 |
|
|
| 242 |
< |
\begin{lstlisting}[float,caption={[].},label={appendixScheme:visitor}] |
| 242 |
> |
\begin{figure} |
| 243 |
> |
\centering |
| 244 |
> |
\includegraphics[width=\linewidth]{architecture.eps} |
| 245 |
> |
\caption[The architecture of {\sc OOPSE}] {Overview of the structure |
| 246 |
> |
of {\sc OOPSE}} \label{appendixFig:visitorUML} |
| 247 |
> |
\end{figure} |
| 248 |
> |
|
| 249 |
> |
\begin{lstlisting}[float,caption={[The implementation of Visitor pattern (I)]Source code of the visitor classes.},label={appendixScheme:visitor}] |
| 250 |
|
class BaseVisitor{ |
| 251 |
|
public: |
| 252 |
|
virtual void visit(Atom* atom); |
| 254 |
|
virtual void visit(RigidBody* rb); |
| 255 |
|
}; |
| 256 |
|
\end{lstlisting} |
| 257 |
< |
\begin{lstlisting}[float,caption={[].},label={appendixScheme:element}] |
| 257 |
> |
|
| 258 |
> |
\begin{lstlisting}[float,caption={[The implementation of Visitor pattern (II)]Source code of the element classes.},label={appendixScheme:element}] |
| 259 |
|
class StuntDouble { |
| 260 |
|
public: |
| 261 |
|
virtual void accept(BaseVisitor* v) = 0; |
