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//
// VMime library (http://www.vmime.org)
// Copyright (C) 2002-2006 Vincent Richard <vincent@vincent-richard.net>
//
// 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; either version 2 of
// the License, or (at your option) any later version.
//
// 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; if not, write to the Free Software Foundation, Inc.,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
//
// Linking this library statically or dynamically with other modules is making
// a combined work based on this library. Thus, the terms and conditions of
// the GNU General Public License cover the whole combination.
//
#ifndef VMIME_SECURITY_DIGEST_MESSAGEDIGESTFACTORY_HPP_INCLUDED
#define VMIME_SECURITY_DIGEST_MESSAGEDIGESTFACTORY_HPP_INCLUDED
#include "vmime/types.hpp"
#include "vmime/security/digest/messageDigest.hpp"
#include "vmime/utility/stringUtils.hpp"
namespace vmime {
namespace security {
namespace digest {
/** Creates instances of message digest algorithms.
*/
class messageDigestFactory
{
private:
messageDigestFactory();
~messageDigestFactory();
public:
static messageDigestFactory* getInstance();
private:
class digestAlgorithmFactory : public object
{
public:
virtual ref <messageDigest> create() const = 0;
};
template <class E>
class digestAlgorithmFactoryImpl : public digestAlgorithmFactory
{
public:
ref <messageDigest> create() const
{
return vmime::create <E>();
}
};
typedef std::map <std::string, ref <digestAlgorithmFactory> > MapType;
MapType m_algos;
public:
/** Register a new digest algorithm by its name.
*
* @param name algorithm name
*/
template <class E>
void registerAlgorithm(const string& name)
{
m_algos.insert(MapType::value_type(utility::stringUtils::toLower(name),
vmime::create <digestAlgorithmFactoryImpl <E> >()));
}
/** Create a new algorithm instance from its name.
*
* @param name algorithm name (eg. "md5")
* @return a new algorithm instance for the specified name
* @throw exceptions::no_digest_algorithm_available if no algorithm is
* registered with this name
*/
ref <messageDigest> create(const string& name);
/** Return a list of supported digest algorithms.
*
* @return list of supported digest algorithms
*/
const std::vector <string> getSupportedAlgorithms() const;
};
} // digest
} // security
} // vmime
#endif // VMIME_SECURITY_DIGEST_MESSAGEDIGESTFACTORY_HPP_INCLUDED
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