bundles/org.simantics.objmap2/src/org/simantics/objmap/graph/rules/domain/LinkedListAccessor.java

   1 /*******************************************************************************
   2  * Copyright (c) 2019 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  *     Semantum oy - initial API and implementation
  11  *******************************************************************************/
  12 package org.simantics.objmap.graph.rules.domain;
  13
  14 import java.util.ArrayList;
  15 import java.util.Collection;
  16
  17 import org.simantics.db.ReadGraph;
  18 import org.simantics.db.Resource;
  19 import org.simantics.db.WriteGraph;
  20 import org.simantics.db.common.utils.ListUtils;
  21 import org.simantics.db.exception.DatabaseException;
  22 import org.simantics.objmap.exceptions.MappingException;
  23 import org.slf4j.Logger;
  24 import org.slf4j.LoggerFactory;
  25
  26 /**
  27  * Accesses the set of objects attached to the element by the given relation.
  28  * @author Hannu Niemistö
  29  */
  30 public class LinkedListAccessor implements IDomainAccessor<Resource,Collection<Resource>> {
  31
  32         static Logger LOGGER = LoggerFactory.getLogger(LinkedListAccessor.class);
  33
  34         Resource relation;
  35         Resource listType;
  36         boolean deleteExtraObjects;
  37
  38         public LinkedListAccessor(Resource relation, Resource listType, boolean deleteExtraObjects) {
  39                 super();
  40                 this.relation = relation;
  41                 this.listType = listType;
  42                 this.deleteExtraObjects = deleteExtraObjects;
  43         }
  44
  45         @Override
  46         public Collection<Resource> get(ReadGraph g, Resource element) throws MappingException {
  47                 try {
  48                         LOGGER.trace("        LinkdedListAccessor.get");
  49                         return ListUtils.toList(g, g.getPossibleObject(element, relation));
  50                 } catch (DatabaseException e) {
  51                         throw new MappingException(e);
  52                 }
  53         }
  54
  55         @Override
  56         public boolean set(WriteGraph g, Resource element, Collection<Resource> value)
  57                         throws MappingException {
  58                 try {
  59                         LOGGER.trace("        LinkdedListAccessor.set");
  60                         return MappingUtils.synchronizeList(g, element, relation, listType, new ArrayList<Resource>(value), deleteExtraObjects);
  61                 } catch (DatabaseException e) {
  62                         throw new MappingException(e);
  63                 }
  64
  65         }
  66
  67 }