+/*******************************************************************************\r
+ * Copyright (c) 2007, 2013 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.objmap.structural.annotations.factories;\r
+\r
+import java.lang.annotation.Annotation;\r
+import java.lang.reflect.Field;\r
+import java.util.Collection;\r
+import java.util.Collections;\r
+\r
+import org.simantics.db.ReadGraph;\r
+import org.simantics.db.exception.ResourceNotFoundException;\r
+import org.simantics.db.exception.ServiceException;\r
+import org.simantics.db.exception.ValidationException;\r
+import org.simantics.objmap.bidirectional.IBidirectionalMappingRule;\r
+import org.simantics.objmap.graph.annotations.OptionalRelatedElements;\r
+import org.simantics.objmap.graph.rules.MappedElementsRule;\r
+import org.simantics.objmap.structural.rules.domain.RelatedObjectsAccessor;\r
+import org.simantics.objmap.graph.rules.factory.IFieldRuleFactory;\r
+import org.simantics.objmap.graph.rules.range.FieldAccessorWithDefault;\r
+import org.simantics.objmap.structural.StructuralResource;\r
+\r
+\r
+public class OptionalRelatedElementsRuleFactory<Range> implements IFieldRuleFactory<StructuralResource, Range> {\r
+\r
+ @Override\r
+ public IBidirectionalMappingRule<StructuralResource, Range> create(ReadGraph g, Annotation _annotation, Field field) throws ResourceNotFoundException, ValidationException, ServiceException {\r
+ OptionalRelatedElements annotation = (OptionalRelatedElements)_annotation;\r
+ return new MappedElementsRule<StructuralResource, Range>(\r
+ new RelatedObjectsAccessor(g.getResource(annotation.value()),\r
+ annotation.composition(),false),\r
+ new FieldAccessorWithDefault<Range,Collection<Range>>(field, Collections.<Range>emptyList())\r
+ );\r
+ }\r
+\r
+}\r