bundles/org.simantics.objmap2/src/org/simantics/objmap/graph/annotations/factories/OptionalRelatedElementsRuleFactory.java

   1 /*******************************************************************************\r
   2  * Copyright (c) 2007, 2013 Association for Decentralized Information Management\r
   3  * in Industry THTH ry.\r
   4  * All rights reserved. This program and the accompanying materials\r
   5  * are made available under the terms of the Eclipse Public License v1.0\r
   6  * which accompanies this distribution, and is available at\r
   7  * http://www.eclipse.org/legal/epl-v10.html\r
   8  *\r
   9  * Contributors:\r
  10  *     VTT Technical Research Centre of Finland - initial API and implementation\r
  11  *******************************************************************************/\r
  12 package org.simantics.objmap.graph.annotations.factories;\r
  13 \r
  14 import java.lang.annotation.Annotation;\r
  15 import java.lang.reflect.Field;\r
  16 import java.util.Collection;\r
  17 import java.util.Collections;\r
  18 \r
  19 import org.simantics.db.ReadGraph;\r
  20 import org.simantics.db.Resource;\r
  21 import org.simantics.db.exception.ResourceNotFoundException;\r
  22 import org.simantics.db.exception.ServiceException;\r
  23 import org.simantics.db.exception.ValidationException;\r
  24 import org.simantics.objmap.bidirectional.IBidirectionalMappingRule;\r
  25 import org.simantics.objmap.graph.annotations.OptionalRelatedElements;\r
  26 import org.simantics.objmap.graph.rules.MappedElementsRule;\r
  27 import org.simantics.objmap.graph.rules.domain.RelatedObjectsAccessor;\r
  28 import org.simantics.objmap.graph.rules.factory.IFieldRuleFactory;\r
  29 import org.simantics.objmap.graph.rules.range.FieldAccessorWithDefault;\r
  30 \r
  31 \r
  32 public class OptionalRelatedElementsRuleFactory<Range> implements IFieldRuleFactory<Resource, Range> {\r
  33 \r
  34     @Override\r
  35     public IBidirectionalMappingRule<Resource, Range> create(ReadGraph g, Annotation _annotation, Field field) throws ResourceNotFoundException, ValidationException, ServiceException {\r
  36         OptionalRelatedElements annotation = (OptionalRelatedElements)_annotation;\r
  37         return new MappedElementsRule<Resource, Range>(\r
  38                 new RelatedObjectsAccessor(g.getResource(annotation.value()),\r
  39                         annotation.composition()),\r
  40                 new FieldAccessorWithDefault<Range,Collection<Range>>(field, Collections.<Range>emptyList())\r
  41                 );\r
  42     }\r
  43 \r
  44 }\r