bundles/org.simantics.db.common/src/org/simantics/db/common/request/PossibleTypedParent.java

   1 /*******************************************************************************
   2  * Copyright (c) 2007, 2018 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.db.common.request;
  13
  14 import org.simantics.db.ReadGraph;
  15 import org.simantics.db.Resource;
  16 import org.simantics.db.exception.DatabaseException;
  17 import org.simantics.layer0.Layer0;
  18
  19 public class PossibleTypedParent extends ResourceRead2<Resource> {
  20
  21         public PossibleTypedParent(Resource resource, Resource type) {
  22                 super(resource, type);
  23         }
  24
  25         @Override
  26         public Resource perform(ReadGraph graph) throws DatabaseException {
  27                 if (graph.isInstanceOf(resource, resource2)) {
  28                         return resource;
  29                 } else {
  30                         Layer0 L0 = Layer0.getInstance(graph);
  31                         Resource possibleParent = graph.getPossibleObject(resource, L0.PartOf);
  32                         if (possibleParent != null) {
  33                                 return graph.syncRequest(new PossibleTypedParent(possibleParent, resource2));
  34                         } else {
  35                                 return null;
  36                         }
  37                 }
  38         }
  39
  40 }