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/*
Copyright (C) 2000-2007 MySQL AB
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; see the file COPYING. If not, write to the
Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
MA 02110-1301 USA.
*/
/* The factory header defines an Object Factory, used by SSL message and
* handshake types.
*
* See Desgin Pattern in GoF and Alexandrescu's chapter in Modern C++ Design,
* page 208
*/
#ifndef yaSSL_FACTORY_HPP
#define yaSSL_FACTORY_HPP
#include STL_VECTOR_FILE
#include STL_PAIR_FILE
namespace STL = STL_NAMESPACE;
namespace yaSSL {
// Factory uses its callback map to create objects by id,
// returning an abstract base pointer
template<class AbstractProduct,
typename IdentifierType = int,
typename ProductCreator = AbstractProduct* (*)()
>
class Factory {
typedef STL::pair<IdentifierType, ProductCreator> CallBack;
typedef STL::vector<CallBack> CallBackVector;
CallBackVector callbacks_;
public:
// pass function pointer to register all callbacks upon creation
explicit Factory(void (*init)(Factory<AbstractProduct, IdentifierType,
ProductCreator>&))
{
init(*this);
}
// reserve place in vector before registering, used by init funcion
void Reserve(size_t sz)
{
callbacks_.reserve(sz);
}
// register callback
void Register(const IdentifierType& id, ProductCreator pc)
{
callbacks_.push_back(STL::make_pair(id, pc));
}
// THE Creator, returns a new object of the proper type or 0
AbstractProduct* CreateObject(const IdentifierType& id) const
{
typedef typename STL::vector<CallBack>::const_iterator cIter;
cIter first = callbacks_.begin();
cIter last = callbacks_.end();
while (first != last) {
if (first->first == id)
break;
++first;
}
if (first == callbacks_.end())
return 0;
return (first->second)();
}
private:
Factory(const Factory&); // hide copy
Factory& operator=(const Factory&); // and assign
};
} // naemspace
#endif // yaSSL_FACTORY_HPP
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