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+/*
+  This file is part of Ingen.
+  Copyright 2007-2016 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/>.
+*/
+
+/**
+   @defgroup Ingen Core Interfaces
+*/
+
+#ifndef INGEN_INTERFACE_HPP
+#define INGEN_INTERFACE_HPP
+
+#include <cstdint>
+#include <string>
+
+#include "ingen/Message.hpp"
+#include "ingen/Properties.hpp"
+#include "ingen/Resource.hpp"
+#include "ingen/Status.hpp"
+#include "ingen/ingen.h"
+#include "ingen/types.hpp"
+
+namespace Raul {
+class Path;
+}
+
+namespace ingen {
+
+class Atom;
+class URI;
+
+/** Abstract interface for Ingen servers and clients.
+ *
+ * @ingroup Ingen
+ */
+class INGEN_API Interface
+{
+public:
+	using result_type = void;
+
+	Interface() : _seq(0) {}
+
+	virtual ~Interface() = default;
+
+	virtual URI uri() const = 0;
+
+	virtual SPtr<Interface> respondee() const { return SPtr<Interface>(); }
+
+	virtual void set_respondee(SPtr<Interface> respondee) {}
+
+	virtual void message(const Message& msg) = 0;
+
+	/** @name Convenience API
+	 * @{
+	 */
+
+	inline void operator()(const Message& msg) { message(msg); }
+
+	inline void set_response_id(int32_t id) { _seq = id; }
+
+	inline void bundle_begin() { message(BundleBegin{_seq++}); }
+	inline void bundle_end()   { message(BundleEnd{_seq++}); }
+
+	inline void put(const URI&        uri,
+	                const Properties& properties,
+	                Resource::Graph   ctx = Resource::Graph::DEFAULT)
+	{
+		message(Put{_seq++, uri, properties, ctx});
+	}
+
+	inline void delta(const URI&        uri,
+	                  const Properties& remove,
+	                  const Properties& add,
+	                  Resource::Graph   ctx = Resource::Graph::DEFAULT)
+	{
+		message(Delta{_seq++, uri, remove, add, ctx});
+	}
+
+	inline void copy(const URI& old_uri, const URI& new_uri)
+	{
+		message(Copy{_seq++, old_uri, new_uri});
+	}
+
+	inline void move(const Raul::Path& old_path, const Raul::Path& new_path)
+	{
+		message(Move{_seq++, old_path, new_path});
+	}
+
+	inline void del(const URI& uri) { message(Del{_seq++, uri}); }
+
+	inline void connect(const Raul::Path& tail, const Raul::Path& head)
+	{
+		message(Connect{_seq++, tail, head});
+	}
+
+	inline void disconnect(const Raul::Path& tail, const Raul::Path& head)
+	{
+		message(Disconnect{_seq++, tail, head});
+	}
+
+	inline void disconnect_all(const Raul::Path& graph, const Raul::Path& path)
+	{
+		message(DisconnectAll{_seq++, graph, path});
+	}
+
+	inline void set_property(const URI&      subject,
+	                         const URI&      predicate,
+	                         const Atom&     value,
+	                         Resource::Graph ctx = Resource::Graph::DEFAULT)
+	{
+		message(SetProperty{_seq++, subject, predicate, value, ctx});
+	}
+
+	inline void undo() { message(Undo{_seq++}); }
+
+	inline void redo() { message(Redo{_seq++}); }
+
+	inline void get(const URI& uri) { message(Get{_seq++, uri}); }
+
+	inline void response(int32_t id, Status status, const std::string& subject)
+	{
+		message(Response{id, status, subject});
+	}
+
+	inline void error(const std::string& error_message)
+	{
+		message(Error{_seq++, error_message});
+	}
+
+	/** @} */
+
+private:
+	int32_t _seq;
+};
+
+} // namespace ingen
+
+#endif // INGEN_INTERFACE_HPP