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

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