--- /dev/null
+/*******************************************************************************\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.tester;\r
+\r
+import java.util.Collection;\r
+\r
+import org.simantics.browsing.ui.NodeContext;\r
+import org.simantics.browsing.ui.NodeQueryManager;\r
+import org.simantics.browsing.ui.Tester;\r
+import org.simantics.browsing.ui.graph.impl.CommonKeys;\r
+import org.simantics.db.ReadGraph;\r
+import org.simantics.db.RequestProcessor;\r
+import org.simantics.db.Resource;\r
+import org.simantics.db.common.request.ReadRequest;\r
+import org.simantics.db.exception.DatabaseException;\r
+import org.simantics.utils.Container;\r
+\r
+/**\r
+ * @author Tuukka Lehtonen\r
+ */\r
+public class HasRelatedObjectsTester implements Tester {\r
+\r
+ private Resource relation;\r
+\r
+ public HasRelatedObjectsTester(Resource relation) {\r
+ this.relation = relation;\r
+ }\r
+\r
+ public HasRelatedObjectsTester(RequestProcessor processor, final String relationUri) throws DatabaseException {\r
+ processor.syncRequest(new ReadRequest() {\r
+ @Override\r
+ public void run(ReadGraph graph) throws DatabaseException {\r
+ relation = graph.getResource(relationUri);\r
+ }\r
+ });\r
+ }\r
+\r
+ @Override\r
+ public boolean test(NodeQueryManager manager, NodeContext context) {\r
+ Container<Collection<Resource>> objects = manager.query(context, new CommonKeys.RelatedObjectsKey(relation));\r
+ return !objects.get().isEmpty();\r
+ }\r
+\r
+}\r