1 files changed, 42 insertions, 0 deletions
diff --git a/src/engine/Stateful.cpp b/src/engine/Stateful.cpp
new file mode 100644
index 0000000..7ddf1c1
--- /dev/null
+++ b/src/engine/Stateful.cpp
@@ -0,0 +1,42 @@
+/* This file is part of Machina.
+ * Copyright (C) 2010 David Robillard <http://drobilla.net>
+ *
+ * Machina is free software; you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation; either version 2 of the License, or (at your option) any later
+ * version.
+ *
+ * Machina 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 General Public License for details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301, USA
+ */
+
+#include "machina/Stateful.hpp"
+
+namespace Machina {
+
+uint64_t Stateful::_next_id = 1;
+
+Stateful::Stateful()
+	: _id(_next_id++)
+{
+}
+
+
+Redland::Node
+Stateful::id(Redland::World& world) const
+{
+	if (!_rdf_id.is_valid()) {
+		std::ostringstream ss;
+		ss << "b" << _id;
+		_rdf_id = Redland::Node(world, Redland::Node::BLANK, ss.str());
+	}
+
+	return _rdf_id;
+}
+
+} // namespace Machina