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+/*
+  This file is part of Ingen.
+  Copyright 2012-2016 David Robillard <http://drobilla.net/>
+
+  Ingen is free software: you can redistribute it and/or modify it under the
+  terms of the GNU Affero General Public License as published by the Free
+  Software Foundation, either version 3 of the License, or any later version.
+
+  Ingen 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 Affero General Public License for details.
+
+  You should have received a copy of the GNU Affero General Public License
+  along with Ingen.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef INGEN_TURTLE_WRITER_HPP
+#define INGEN_TURTLE_WRITER_HPP
+
+#include <cstddef>
+#include <cstdint>
+
+#include "ingen/AtomSink.hpp"
+#include "ingen/AtomWriter.hpp"
+#include "ingen/ingen.h"
+#include "lv2/atom/atom.h"
+#include "serd/serd.h"
+#include "sratom/sratom.h"
+
+namespace ingen {
+
+class URIMap;
+class URIs;
+
+/** An Interface that writes Turtle messages to a sink method.
+ *
+ * Derived classes must implement text_sink() to do something with the
+ * serialized messages.
+ */
+class INGEN_API TurtleWriter : public AtomWriter, public AtomSink
+{
+public:
+	TurtleWriter(URIMap& map, URIs& uris, const URI& uri);
+
+	~TurtleWriter() override;
+
+	/** AtomSink method which receives calls serialized to LV2 atoms. */
+	bool write(const LV2_Atom* msg, int32_t default_id=0) override;
+
+	/** Pure virtual text sink which receives calls serialized to Turtle. */
+	virtual size_t text_sink(const void* buf, size_t len) = 0;
+
+	URI uri() const override { return _uri; }
+
+protected:
+	URIMap&     _map;
+	Sratom*     _sratom;
+	SerdNode    _base;
+	SerdURI     _base_uri;
+	SerdEnv*    _env;
+	SerdWriter* _writer;
+	URI         _uri;
+	bool        _wrote_prefixes;
+};
+
+}  // namespace ingen
+
+#endif  // INGEN_TURTLE_WRITER_HPP