84 lines
2.7 KiB
C++
84 lines
2.7 KiB
C++
/* vim: set sw=4 sts=4 et foldmethod=syntax : */
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/*
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* Copyright (c) 2011, 2012 David Leverton
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*
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* This file is part of the Paludis package manager. Paludis is free software;
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* you can redistribute it and/or modify it under the terms of the GNU General
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* Public License version 2, as published by the Free Software Foundation.
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*
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* Paludis is distributed in the hope that it will be useful, but WITHOUT ANY
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* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc., 59 Temple
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* Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef PALUDIS_GUARD_PALUDIS_UTIL_DIGEST_REGISTRY_HH
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#define PALUDIS_GUARD_PALUDIS_UTIL_DIGEST_REGISTRY_HH 1
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#include <iosfwd>
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#include <string>
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#include <paludis/util/attributes.hh>
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#include <paludis/util/pimp.hh>
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#include <paludis/util/singleton.hh>
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#include <paludis/util/wrapped_forward_iterator-fwd.hh>
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#include <functional>
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#include <utility>
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namespace paludis
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{
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class DigestRegistry;
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extern template class Pimp<DigestRegistry>;
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extern template class PALUDIS_VISIBLE Singleton<DigestRegistry>;
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class PALUDIS_VISIBLE DigestRegistry :
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public Singleton<DigestRegistry>
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{
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friend class Singleton<DigestRegistry>;
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public:
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typedef std::function<std::string (std::istream &)> Function;
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Function get(const std::string & algo) const;
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struct AlgorithmsConstIteratorTag;
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typedef WrappedForwardIterator<AlgorithmsConstIteratorTag, const std::pair<const std::string, Function> > AlgorithmsConstIterator;
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AlgorithmsConstIterator begin_algorithms() const PALUDIS_ATTRIBUTE((warn_unused_result));
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AlgorithmsConstIterator end_algorithms() const PALUDIS_ATTRIBUTE((warn_unused_result));
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template <typename T_>
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class Registration
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{
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public:
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Registration(const std::string & algo)
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{
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get_instance()->register_function(algo, do_digest<T_>);
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}
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};
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private:
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DigestRegistry();
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~DigestRegistry();
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Pimp<DigestRegistry> _imp;
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void register_function(const std::string & algo, const Function & func);
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template <typename T_>
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static std::string
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do_digest(std::istream & stream)
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{
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T_ digest(stream);
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return digest.hexsum();
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}
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};
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}
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#endif
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