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diff --git a/src/server/PortType.hpp b/src/server/PortType.hpp
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+/*
+  This file is part of Ingen.
+  Copyright 2007-2015 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_INTERFACE_PORTTYPE_HPP
+#define INGEN_INTERFACE_PORTTYPE_HPP
+
+#include "lv2/atom/atom.h"
+#include "lv2/core/lv2.h"
+
+#include <cassert>
+
+namespace ingen {
+
+/** The type of a port.
+ *
+ * This type refers to the type of the port itself (not necessarily the type
+ * of its contents).  Ports with different types can contain the same type of
+ * data, but may e.g. have different access semantics.
+ */
+class PortType {
+public:
+	enum ID {
+		UNKNOWN = 0,
+		AUDIO   = 1,
+		CONTROL = 2,
+		CV      = 3,
+		ATOM    = 4
+	};
+
+	explicit PortType(const URI& uri)
+		: _id(UNKNOWN)
+	{
+		if (uri == type_uri(AUDIO)) {
+			_id = AUDIO;
+		} else if (uri == type_uri(CONTROL)) {
+			_id = CONTROL;
+		} else if (uri == type_uri(CV)) {
+			_id = CV;
+		} else if (uri == type_uri(ATOM)) {
+			_id = ATOM;
+		}
+	}
+
+	PortType(ID id) : _id(id) {}
+
+	inline const URI& uri() const { return type_uri(_id); }
+	inline ID         id() const { return _id; }
+
+	inline bool operator==(const ID& id) const { return (_id == id); }
+	inline bool operator!=(const ID& id) const { return (_id != id); }
+	inline bool operator==(const PortType& type) const { return (_id == type._id); }
+	inline bool operator!=(const PortType& type) const { return (_id != type._id); }
+	inline bool operator<(const PortType& type)  const { return (_id < type._id); }
+
+	inline bool is_audio()   { return _id == AUDIO; }
+	inline bool is_control() { return _id == CONTROL; }
+	inline bool is_cv()      { return _id == CV; }
+	inline bool is_atom()    { return _id == ATOM; }
+
+private:
+	static inline const URI& type_uri(unsigned id_num) {
+		assert(id_num <= ATOM);
+		static const URI uris[] = {
+			URI("http://www.w3.org/2002/07/owl#Nothing"),
+			URI(LV2_CORE__AudioPort),
+			URI(LV2_CORE__ControlPort),
+			URI(LV2_CORE__CVPort),
+			URI(LV2_ATOM__AtomPort)
+		};
+		return uris[id_num];
+	}
+
+	ID _id;
+};
+
+} // namespace ingen
+
+#endif // INGEN_INTERFACE_PORTTYPE_HPP