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+/* vim: set sw=4 sts=4 et foldmethod=syntax : */
+
+/*
+ * Copyright (c) 2011 David Leverton
+ *
+ * This file is part of the Paludis package manager. Paludis is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU General
+ * Public License version 2, as published by the Free Software Foundation.
+ *
+ * Paludis 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., 59 Temple
+ * Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#ifndef PALUDIS_GUARD_PALUDIS_UTIL_DIGEST_REGISTRY_HH
+#define PALUDIS_GUARD_PALUDIS_UTIL_DIGEST_REGISTRY_HH 1
+
+#include <iosfwd>
+#include <string>
+#include <paludis/util/attributes.hh>
+#include <paludis/util/pimp.hh>
+#include <paludis/util/singleton.hh>
+#include <functional>
+
+namespace paludis
+{
+ class PALUDIS_VISIBLE DigestRegistry :
+ public Singleton<DigestRegistry>
+ {
+ friend class Singleton<DigestRegistry>;
+
+ public:
+ typedef std::function<std::string (std::istream &)> Function;
+
+ Function get(const std::string & algo) const;
+
+ template <typename T_>
+ class Registration
+ {
+ public:
+ Registration(const std::string & algo)
+ {
+ get_instance()->register_function(algo, do_digest<T_>);
+ }
+ };
+
+ private:
+ DigestRegistry();
+ ~DigestRegistry();
+
+ Pimp<DigestRegistry> _imp;
+
+ void register_function(const std::string & algo, const Function & func);
+
+ template <typename T_>
+ static std::string
+ do_digest(std::istream & stream)
+ {
+ T_ digest(stream);
+ return digest.hexsum();
+ }
+ };
+
+ extern template class Pimp<DigestRegistry>;
+ extern template class Singleton<DigestRegistry>;
+}
+
+#endif