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//
// VMime library (http://vmime.sourceforge.net)
// Copyright (C) 2002-2004 Vincent Richard <[email protected]>
//
// 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., 675 Mass Ave, Cambridge, MA 02139, USA.
//
#ifndef VMIME_ENCODERFACTORY_HPP_INCLUDED
#define VMIME_ENCODERFACTORY_HPP_INCLUDED
#include "encoder.hpp"
#include "utility/singleton.hpp"
#include "utility/stringUtils.hpp"
namespace vmime
{
/** A factory to create 'encoder' objects for the specified encoding.
*/
class encoderFactory : public utility::singleton <encoderFactory>
{
friend class utility::singleton <encoderFactory>;
private:
encoderFactory();
~encoderFactory();
public:
/** Information about a registered encoder. */
class registeredEncoder
{
friend class encoderFactory;
protected:
virtual ~registeredEncoder() { }
public:
virtual encoder* create() const = 0;
virtual const string& getName() const = 0;
};
private:
template <class E>
class registeredEncoderImpl : public registeredEncoder
{
friend class encoderFactory;
protected:
registeredEncoderImpl(const string& name) : m_name(name) { }
public:
encoder* create() const
{
return new E;
}
const string& getName() const
{
return (m_name);
}
private:
const string m_name;
};
std::vector <registeredEncoder*> m_encoders;
public:
/** Register a new encoder by its encoding name.
*
* @param name encoding name
*/
template <class E>
void registerName(const string& name)
{
m_encoders.push_back(new registeredEncoderImpl <E>(stringUtils::toLower(name)));
}
/** Create a new encoder instance from an encoding name.
*
* @param name encoding name (eg. "base64")
* @return a new encoder instance for the specified encoding
* @throw exceptions::no_encoder_available if no encoder is registered
* for this encoding
*/
encoder* create(const string& name);
/** Return information about a registered encoder.
*
* @param name encoding name
* @return information about this encoder
* @throw exceptions::no_encoder_available if no encoder is registered
* for this encoding
*/
const registeredEncoder* getEncoderByName(const string& name) const;
/** Return the number of registered encoders.
*
* @return number of registered encoders
*/
const int getEncoderCount() const;
/** Return the registered encoder at the specified position.
*
* @param pos position of the registered encoder to return
* @return registered encoder at the specified position
*/
const registeredEncoder* getEncoderAt(const int pos) const;
/** Return a list of all registered encoders.
*
* @return list of registered encoders
*/
const std::vector <const registeredEncoder*> getEncoderList() const;
};
} // vmime
#endif // VMIME_ENCODERFACTORY_HPP_INCLUDED
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