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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_NODE_HPP
+#define INGEN_NODE_HPP
+
+#include <cstdint>
+#include <map>
+#include <string>
+#include <utility>
+
+#include "ingen/Resource.hpp"
+#include "ingen/ingen.h"
+#include "ingen/paths.hpp"
+#include "ingen/types.hpp"
+#include "lilv/lilv.h"
+
+namespace Raul {
+class Path;
+class Symbol;
+}
+
+namespace ingen {
+
+class Arc;
+class FilePath;
+class Store;
+class URIs;
+
+/** A node in the audio graph.
+ *
+ * The key property of nodes is that all nodes have a path and a symbol, as
+ * well as a URI.
+ *
+ * To avoid ugly inheritance issues and the need for excessive use of
+ * dynamic_cast, this class contains some members which are only applicable to
+ * certain types of node.  There is a type tag which can be used to determine
+ * the type of any Node.
+ *
+ * @ingroup Ingen
+ */
+class INGEN_API Node : public Resource
+{
+public:
+	enum class GraphType {
+		GRAPH,
+		BLOCK,
+		PORT
+	};
+
+	typedef std::pair<const Node*, const Node*> ArcsKey;
+	typedef std::map< ArcsKey, SPtr<Arc> > Arcs;
+
+	// Graphs only
+	Arcs&       arcs()       { return _arcs; }
+	const Arcs& arcs() const { return _arcs; }
+
+	// Blocks and graphs only
+	virtual uint32_t        num_ports()          const { return 0; }
+	virtual Node*           port(uint32_t index) const { return nullptr; }
+	virtual const Resource* plugin()             const { return nullptr; }
+
+	// Plugin blocks only
+	virtual LilvInstance* instance() { return nullptr; }
+	virtual bool save_state(const FilePath& dir) const { return false; }
+
+	// All objects
+	virtual GraphType           graph_type()   const = 0;
+	virtual const Raul::Path&   path()         const = 0;
+	virtual const Raul::Symbol& symbol()       const = 0;
+	virtual Node*               graph_parent() const = 0;
+
+	URI base_uri() const {
+		if (uri().string()[uri().string().size() - 1] == '/') {
+			return uri();
+		}
+		return URI(uri().string() + '/');
+	}
+
+protected:
+	friend class Store;
+	virtual void set_path(const Raul::Path& p) = 0;
+
+	Node(const URIs& uris, const Raul::Path& path)
+		: Resource(uris, path_to_uri(path))
+	{}
+
+	Arcs _arcs;  ///< Graphs only
+};
+
+} // namespace ingen
+
+#endif // INGEN_NODE_HPP