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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
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