+/*******************************************************************************\r
+ * Copyright (c) 2007, 2010 Association for Decentralized Information Management\r
+ * in Industry THTH ry.\r
+ * All rights reserved. This program and the accompanying materials\r
+ * are made available under the terms of the Eclipse Public License v1.0\r
+ * which accompanies this distribution, and is available at\r
+ * http://www.eclipse.org/legal/epl-v10.html\r
+ *\r
+ * Contributors:\r
+ * VTT Technical Research Centre of Finland - initial API and implementation\r
+ *******************************************************************************/\r
+package org.simantics.browsing.ui.graph.impl.request;\r
+\r
+import org.simantics.databoard.Bindings;\r
+import org.simantics.db.ReadGraph;\r
+import org.simantics.db.Resource;\r
+import org.simantics.db.common.request.ResourceRead;\r
+import org.simantics.db.common.utils.NameUtils;\r
+import org.simantics.db.exception.DatabaseException;\r
+import org.simantics.db.exception.ValidationException;\r
+import org.simantics.layer0.Layer0;\r
+\r
+/**\r
+ * @author Tuukka Lehtonen\r
+ */\r
+public class GetLabel extends ResourceRead<String> {\r
+\r
+ public GetLabel(Resource r) {\r
+ super(r);\r
+ }\r
+\r
+ @Override\r
+ public String perform(ReadGraph graph) throws DatabaseException {\r
+ Layer0 l0 = Layer0.getInstance(graph);\r
+ String label = graph.getPossibleRelatedValue(resource, l0.HasLabel, Bindings.STRING);\r
+ if (label == null)\r
+ label = graph.getPossibleRelatedValue(resource, l0.HasName, Bindings.STRING);\r
+ if (label == null) {\r
+ String rep = NameUtils.getSafeName(graph, resource);\r
+ throw new ValidationException("Resource '" + rep + "' does not have a Label or a Name property.");\r
+ }\r
+ return label;\r
+ }\r
+\r
+}\r