148 lines
3.3 KiB
C++
148 lines
3.3 KiB
C++
//
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// VMime library (http://www.vmime.org)
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// Copyright (C) 2002-2005 Vincent Richard <vincent@vincent-richard.net>
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License as
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// published by the Free Software Foundation; either version 2 of
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// the License, or (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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//
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#ifndef VMIME_ENCODERFACTORY_HPP_INCLUDED
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#define VMIME_ENCODERFACTORY_HPP_INCLUDED
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#include "vmime/encoder.hpp"
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#include "vmime/utility/stringUtils.hpp"
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namespace vmime
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{
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/** A factory to create 'encoder' objects for the specified encoding.
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*/
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class encoderFactory
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{
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private:
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encoderFactory();
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~encoderFactory();
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public:
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static encoderFactory* getInstance();
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/** Information about a registered encoder. */
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class registeredEncoder
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{
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friend class encoderFactory;
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protected:
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virtual ~registeredEncoder() { }
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public:
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virtual encoder* create() const = 0;
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virtual const string& getName() const = 0;
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};
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private:
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template <class E>
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class registeredEncoderImpl : public registeredEncoder
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{
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friend class encoderFactory;
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protected:
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registeredEncoderImpl(const string& name) : m_name(name) { }
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public:
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encoder* create() const
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{
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return new E;
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}
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const string& getName() const
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{
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return (m_name);
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}
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private:
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const string m_name;
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};
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std::vector <registeredEncoder*> m_encoders;
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public:
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/** Register a new encoder by its encoding name.
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*
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* @param name encoding name
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*/
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template <class E>
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void registerName(const string& name)
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{
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m_encoders.push_back(new registeredEncoderImpl <E>(utility::stringUtils::toLower(name)));
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}
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/** Create a new encoder instance from an encoding name.
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*
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* @param name encoding name (eg. "base64")
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* @return a new encoder instance for the specified encoding
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* @throw exceptions::no_encoder_available if no encoder is registered
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* for this encoding
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*/
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encoder* create(const string& name);
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/** Return information about a registered encoder.
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*
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* @param name encoding name
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* @return information about this encoder
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* @throw exceptions::no_encoder_available if no encoder is registered
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* for this encoding
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*/
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const registeredEncoder* getEncoderByName(const string& name) const;
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/** Return the number of registered encoders.
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*
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* @return number of registered encoders
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*/
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const int getEncoderCount() const;
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/** Return the registered encoder at the specified position.
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*
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* @param pos position of the registered encoder to return
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* @return registered encoder at the specified position
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*/
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const registeredEncoder* getEncoderAt(const int pos) const;
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/** Return a list of all registered encoders.
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*
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* @return list of registered encoders
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*/
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const std::vector <const registeredEncoder*> getEncoderList() const;
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};
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} // vmime
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#endif // VMIME_ENCODERFACTORY_HPP_INCLUDED
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