bundles/org.simantics.objmap2/src/org/simantics/objmap/graph/rules/domain/RelatedObjectsAccessor.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.rules.domain;
  13
  14 import java.util.Collection;
  15
  16 import org.slf4j.Logger;
  17 import org.slf4j.LoggerFactory;
  18 import org.simantics.db.ReadGraph;
  19 import org.simantics.db.Resource;
  20 import org.simantics.db.WriteGraph;
  21 import org.simantics.db.exception.DatabaseException;
  22 import org.simantics.objmap.exceptions.MappingException;
  23
  24 /**
  25  * Accesses the set of objects attached to the element by the given relation.
  26  * @author Hannu Niemistö
  27  */
  28 public class RelatedObjectsAccessor implements IDomainAccessor<Resource,Collection<Resource>> {
  29
  30     static Logger LOGGER = LoggerFactory.getLogger(RelatedObjectsAccessor.class);
  31
  32         Resource relation;
  33         boolean deleteExtraObjects;
  34
  35         public RelatedObjectsAccessor(Resource relation, boolean deleteExtraObjects) {
  36         super();
  37         this.relation = relation;
  38         this.deleteExtraObjects = deleteExtraObjects;
  39     }
  40
  41     @Override
  42         public Collection<Resource> get(ReadGraph g, Resource element) throws MappingException {
  43                 try {
  44                     LOGGER.trace("        RelatedObjectsAccessor.get");
  45                         return g.getObjects(element, relation);
  46                 } catch (DatabaseException e) {
  47                         throw new MappingException(e);
  48                 }
  49         }
  50
  51         @Override
  52         public boolean set(WriteGraph g, Resource element, Collection<Resource> value)
  53                         throws MappingException {
  54                 try {
  55                     LOGGER.trace("        RelatedObjectsAccessor.set");
  56                         return MappingUtils.synchronizeStatements(g, element, relation,
  57                                 value.toArray(new Resource[value.size()]), deleteExtraObjects);
  58                 } catch (DatabaseException e) {
  59                         throw new MappingException(e);
  60                 }
  61
  62         }
  63
  64 }