bundles/org.simantics.db.common/src/org/simantics/db/common/primitiverequest/ForEachAssertedObject.java

   1 /*******************************************************************************
   2  * Copyright (c) 2007, 2010 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.primitiverequest;
  13
  14 import java.util.Collection;
  15
  16 import org.simantics.db.AsyncReadGraph;
  17 import org.simantics.db.ReadGraph;
  18 import org.simantics.db.Resource;
  19 import org.simantics.db.common.request.ResourceRead2;
  20 import org.simantics.db.exception.DatabaseException;
  21 import org.simantics.db.procedure.AsyncMultiProcedure;
  22 import org.simantics.db.service.CollectionSupport;
  23 import org.simantics.utils.DataContainer;
  24
  25 final public class ForEachAssertedObject extends ResourceRead2<Collection<Resource>> {
  26
  27     public ForEachAssertedObject(Resource subject, Resource relation) {
  28         super(subject, relation);
  29     }
  30
  31         @Override
  32         public Collection<Resource> perform(ReadGraph graph) throws DatabaseException {
  33                 CollectionSupport cs = graph.getService(CollectionSupport.class);
  34                 Collection<Resource> result = cs.createSet();
  35                 DataContainer<Throwable> throwable = new DataContainer<Throwable>(null);
  36                 graph.forEachAssertedObject(resource, resource2, new AsyncMultiProcedure<Resource>() {
  37
  38                         @Override
  39                         public void finished(AsyncReadGraph graph) {
  40                         }
  41
  42                         @Override
  43                         public void execute(AsyncReadGraph graph, Resource r) {
  44                                 result.add(r);
  45                         }
  46
  47                         @Override
  48                         public void exception(AsyncReadGraph graph, Throwable t) {
  49                                 throwable.set(t);
  50                         }
  51                 });
  52                 Throwable t = throwable.get();
  53                 if(t != null)
  54                         if(t instanceof DatabaseException)
  55                                 throw (DatabaseException)t;
  56                         else throw new DatabaseException(t);
  57                 return result;
  58         }
  59
  60 }