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diff --git a/include/ingen/URIMap.hpp b/include/ingen/URIMap.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_URIMAP_HPP
+#define INGEN_URIMAP_HPP
+
+#include <ingen/LV2Features.hpp>
+#include <ingen/ingen.h>
+#include <ingen/memory.hpp>
+#include <lv2/core/lv2.h>
+#include <lv2/urid/urid.h>
+#include <raul/Noncopyable.hpp>
+
+#include <cstdint>
+#include <memory>
+#include <mutex>
+#include <string>
+#include <unordered_map>
+#include <vector>
+
+namespace ingen {
+
+class Log;
+
+/** URI to integer map and implementation of LV2 URID extension.
+ * @ingroup IngenShared
+ */
+class INGEN_API URIMap : public raul::Noncopyable
+{
+public:
+	URIMap(Log& log, LV2_URID_Map* map, LV2_URID_Unmap* unmap);
+
+	uint32_t    map_uri(const char* uri);
+	uint32_t    map_uri(const std::string& uri) { return map_uri(uri.c_str()); }
+	const char* unmap_uri(uint32_t urid) const;
+
+	class Feature : public LV2Features::Feature
+	{
+	public:
+		Feature(const char* URI, void* data) : _feature{URI, data} {}
+
+		const char* uri() const override { return _feature.URI; }
+
+		std::shared_ptr<LV2_Feature> feature(World&, Node*) override
+		{
+			return {&_feature, NullDeleter<LV2_Feature>};
+		}
+
+	private:
+		LV2_Feature _feature;
+	};
+
+	struct URIDMapFeature : public Feature {
+		URIDMapFeature(URIMap* map, LV2_URID_Map* impl, Log& log);
+
+		LV2_URID        map(const char* uri);
+		static LV2_URID default_map(LV2_URID_Map_Handle h, const char* c_uri);
+
+		LV2_URID_Map&       data() { return _urid_map; }
+		const LV2_URID_Map& data() const { return _urid_map; }
+
+	private:
+		LV2_URID_Map _urid_map;
+		Log&         _log;
+	};
+
+	struct URIDUnmapFeature : public Feature {
+		URIDUnmapFeature(URIMap* map, LV2_URID_Unmap* impl);
+
+		const char*        unmap(LV2_URID urid) const;
+		static const char* default_unmap(LV2_URID_Map_Handle h, LV2_URID urid);
+
+		LV2_URID_Unmap&       data() { return _urid_unmap; }
+		const LV2_URID_Unmap& data() const { return _urid_unmap; }
+
+	private:
+		LV2_URID_Unmap _urid_unmap;
+	};
+
+	const LV2_URID_Map&   urid_map() const { return _urid_map_feature->data(); }
+	LV2_URID_Map&         urid_map() { return _urid_map_feature->data(); }
+
+	const LV2_URID_Unmap& urid_unmap() const
+	{
+		return _urid_unmap_feature->data();
+	}
+
+	LV2_URID_Unmap& urid_unmap() { return _urid_unmap_feature->data(); }
+
+	std::shared_ptr<URIDMapFeature> urid_map_feature()
+	{
+		return _urid_map_feature;
+	}
+
+	std::shared_ptr<URIDUnmapFeature> urid_unmap_feature()
+	{
+		return _urid_unmap_feature;
+	}
+
+private:
+	friend struct URIDMapFeature;
+	friend struct URIDUnMapFeature;
+
+	std::shared_ptr<URIDMapFeature>   _urid_map_feature;
+	std::shared_ptr<URIDUnmapFeature> _urid_unmap_feature;
+
+	std::mutex                                _mutex;
+	std::unordered_map<std::string, LV2_URID> _map;
+	std::vector<std::string>                  _unmap;
+};
+
+} // namespace ingen
+
+#endif // INGEN_URIMAP_HPP