--- /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.db.common.request;\r
+\r
+import java.util.HashMap;\r
+import java.util.Map;\r
+\r
+import org.simantics.db.ReadGraph;\r
+import org.simantics.db.Resource;\r
+import org.simantics.db.exception.DatabaseException;\r
+import org.simantics.operation.Layer0X;\r
+\r
+/**\r
+ * Given an input resource that consists of resources representing other\r
+ * resources, return a map: represented resource -> representing resource.\r
+ * \r
+ * @author Antti Villberg\r
+ */\r
+public class MappedRelated extends ResourceRead2<Map<Resource, Resource>> {\r
+\r
+ public MappedRelated(Resource flat, Resource relation) {\r
+ super(flat, relation);\r
+ }\r
+\r
+ @Override\r
+ public Map<Resource, Resource> perform(ReadGraph graph) throws DatabaseException {\r
+\r
+ Layer0X L0X = Layer0X.getInstance(graph);\r
+ Map<Resource, Resource> result = new HashMap<Resource, Resource>();\r
+\r
+ for (Resource part : graph.getObjects(resource, resource2)) {\r
+ Resource represents = graph.getPossibleObject(part, L0X.Represents);\r
+ if (represents != null)\r
+ result.put(represents, part);\r
+ }\r
+\r
+ return result;\r
+\r
+ }\r
+\r
+}\r