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diff --git a/src/encoderFactory.hpp b/src/encoderFactory.hpp
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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"
+
+
+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:
+
+	class registeredEncoder
+	{
+		friend class encoderFactory;
+
+	protected:
+
+		virtual ~registeredEncoder() { }
+
+	public:
+
+		virtual encoder* create() = 0;
+
+		virtual const string& name() const = 0;
+	};
+
+private:
+
+	template <class E>
+	class registeredEncoderImpl : public registeredEncoder
+	{
+		friend class encoderFactory;
+
+	protected:
+
+		registeredEncoderImpl(const string& name) : m_name(name) { }
+
+	public:
+
+		encoder* create()
+		{
+			return new E;
+		}
+
+		const string& name() const
+		{
+			return (m_name);
+		}
+
+	private:
+
+		const string m_name;
+	};
+
+
+	typedef std::map <string, registeredEncoder*> NameMap;
+	NameMap m_nameMap;
+
+public:
+
+	template <class E>
+	void registerName(const string& name)
+	{
+		const string _name = toLower(name);
+		m_nameMap.insert(NameMap::value_type(_name,
+			new registeredEncoderImpl <E>(_name)));
+	}
+
+	encoder* create(const string& name);
+
+	const registeredEncoder& operator[](const string& name) const;
+
+
+	class iterator;
+
+	class const_iterator
+	{
+		friend class encoderFactory;
+
+	public:
+
+		const_iterator() { }
+		const_iterator(const const_iterator& it) : m_it(it.m_it) { }
+		const_iterator(const iterator& it) : m_it(it.m_it) { }
+
+		const_iterator& operator=(const const_iterator& it) { m_it = it.m_it; return (*this); }
+
+		const registeredEncoder& operator*() const { return (*(*m_it).second); }
+		const registeredEncoder* operator->() const { return ((*m_it).second); }
+
+		const_iterator& operator++() { ++m_it; return (*this); }
+		const_iterator operator++(int) { return (m_it++); }
+
+		const_iterator& operator--() { --m_it; return (*this); }
+		const_iterator operator--(int) { return (m_it--); }
+
+		const bool operator==(const const_iterator& it) const { return (m_it == it.m_it); }
+		const bool operator!=(const const_iterator& it) const { return (m_it != it.m_it); }
+
+	private:
+
+		const_iterator(const NameMap::const_iterator it) : m_it(it) { }
+
+		NameMap::const_iterator m_it;
+	};
+
+	class iterator
+	{
+		friend class encoderFactory;
+		friend class encoderFactory::const_iterator;
+
+	public:
+
+		iterator() { }
+		iterator(const iterator& it) : m_it(it.m_it) { }
+
+		iterator& operator=(const iterator& it) { m_it = it.m_it; return (*this); }
+
+		registeredEncoder& operator*() const { return (*(*m_it).second); }
+		registeredEncoder* operator->() const { return ((*m_it).second); }
+
+		iterator& operator++() { ++m_it; return (*this); }
+		iterator operator++(int) { return (m_it++); }
+
+		iterator& operator--() { --m_it; return (*this); }
+		iterator operator--(int) { return (m_it--); }
+
+		const bool operator==(const iterator& it) const { return (m_it == it.m_it); }
+		const bool operator!=(const iterator& it) const { return (m_it != it.m_it); }
+
+	private:
+
+		iterator(const NameMap::iterator it) : m_it(it) { }
+
+		NameMap::iterator m_it;
+	};
+
+	iterator begin() { return iterator(m_nameMap.begin()); }
+	iterator end() { return iterator(m_nameMap.end()); }
+
+	const_iterator begin() const { return const_iterator(m_nameMap.begin()); }
+	const_iterator end() const { return const_iterator(m_nameMap.end()); }
+};
+
+
+} // vmime
+
+
+#endif // VMIME_ENCODERFACTORY_HPP_INCLUDED