factory.h
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#ifndef CRYPTOPP_OBJFACT_H
#define CRYPTOPP_OBJFACT_H
#include "cryptlib.h"
#include <map>
#include <vector>
NAMESPACE_BEGIN(CryptoPP)
//! _
template <class AbstractClass>
class ObjectFactory
{
public:
virtual ~ObjectFactory () {}
virtual AbstractClass * CreateObject() const =0;
};
//! _
template <class AbstractClass, class ConcreteClass>
class DefaultObjectFactory : public ObjectFactory<AbstractClass>
{
public:
AbstractClass * CreateObject() const
{
return new ConcreteClass;
}
};
//! _
template <class AbstractClass, int instance=0>
class ObjectFactoryRegistry
{
public:
class FactoryNotFound : public Exception
{
public:
FactoryNotFound(const char *name) : Exception(OTHER_ERROR, std::string("ObjectFactoryRegistry: could not find factory for algorithm ") + name) {}
};
~ObjectFactoryRegistry()
{
for (CPP_TYPENAME Map::iterator i = m_map.begin(); i != m_map.end(); ++i)
{
delete (ObjectFactory<AbstractClass> *)i->second;
i->second = NULL;
}
}
void RegisterFactory(const std::string &name, ObjectFactory<AbstractClass> *factory)
{
m_map[name] = factory;
}
const ObjectFactory<AbstractClass> * GetFactory(const char *name) const
{
CPP_TYPENAME Map::const_iterator i = m_map.find(name);
return i == m_map.end() ? NULL : (ObjectFactory<AbstractClass> *)i->second;
}
AbstractClass *CreateObject(const char *name) const
{
const ObjectFactory<AbstractClass> *factory = GetFactory(name);
if (!factory)
throw FactoryNotFound(name);
return factory->CreateObject();
}
// Return a vector containing the factory names. This is easier than returning an iterator.
// from Andrew Pitonyak
std::vector<std::string> GetFactoryNames() const
{
std::vector<std::string> names;
CPP_TYPENAME Map::const_iterator iter;
for (iter = m_map.begin(); iter != m_map.end(); ++iter)
names.push_back(iter->first);
return names;
}
CRYPTOPP_NOINLINE static ObjectFactoryRegistry<AbstractClass, instance> & Registry(CRYPTOPP_NOINLINE_DOTDOTDOT);
private:
// use void * instead of ObjectFactory<AbstractClass> * to save code size
typedef std::map<std::string, void *> Map;
Map m_map;
};
template <class AbstractClass, int instance>
ObjectFactoryRegistry<AbstractClass, instance> & ObjectFactoryRegistry<AbstractClass, instance>::Registry(CRYPTOPP_NOINLINE_DOTDOTDOT)
{
static ObjectFactoryRegistry<AbstractClass, instance> s_registry;
return s_registry;
}
template <class AbstractClass, class ConcreteClass, int instance = 0>
struct RegisterDefaultFactoryFor {
RegisterDefaultFactoryFor(const char *name=NULL)
{
// BCB2006 workaround
std::string n = name ? std::string(name) : std::string(ConcreteClass::StaticAlgorithmName());
ObjectFactoryRegistry<AbstractClass, instance>::Registry().
RegisterFactory(n, new DefaultObjectFactory<AbstractClass, ConcreteClass>);
}};
template <class SchemeClass>
void RegisterAsymmetricCipherDefaultFactories(const char *name=NULL, SchemeClass *dummy=NULL)
{
RegisterDefaultFactoryFor<PK_Encryptor, CPP_TYPENAME SchemeClass::Encryptor>((const char *)name);
RegisterDefaultFactoryFor<PK_Decryptor, CPP_TYPENAME SchemeClass::Decryptor>((const char *)name);
}
template <class SchemeClass>
void RegisterSignatureSchemeDefaultFactories(const char *name=NULL, SchemeClass *dummy=NULL)
{
RegisterDefaultFactoryFor<PK_Signer, CPP_TYPENAME SchemeClass::Signer>((const char *)name);
RegisterDefaultFactoryFor<PK_Verifier, CPP_TYPENAME SchemeClass::Verifier>((const char *)name);
}
template <class SchemeClass>
void RegisterSymmetricCipherDefaultFactories(const char *name=NULL, SchemeClass *dummy=NULL)
{
RegisterDefaultFactoryFor<SymmetricCipher, CPP_TYPENAME SchemeClass::Encryption, ENCRYPTION>((const char *)name);
RegisterDefaultFactoryFor<SymmetricCipher, CPP_TYPENAME SchemeClass::Decryption, DECRYPTION>((const char *)name);
}
template <class SchemeClass>
void RegisterAuthenticatedSymmetricCipherDefaultFactories(const char *name=NULL, SchemeClass *dummy=NULL)
{
RegisterDefaultFactoryFor<AuthenticatedSymmetricCipher, CPP_TYPENAME SchemeClass::Encryption, ENCRYPTION>((const char *)name);
RegisterDefaultFactoryFor<AuthenticatedSymmetricCipher, CPP_TYPENAME SchemeClass::Decryption, DECRYPTION>((const char *)name);
}
NAMESPACE_END
#endif