bundles/org.simantics.modeling/src/org/simantics/modeling/subscription/SubscriptionItemsQuery.java

   1 /*******************************************************************************
   2  * Copyright (c) 2007, 2011 Association for Decentralized Information Management in
   3  * 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.modeling.subscription;
  13
  14 import java.util.Collection;
  15 import java.util.HashSet;
  16 import java.util.Set;
  17
  18 import org.simantics.db.ReadGraph;
  19 import org.simantics.db.Resource;
  20 import org.simantics.db.common.request.UniqueRead;
  21 import org.simantics.db.exception.DatabaseException;
  22 import org.simantics.layer0.Layer0;
  23 import org.simantics.modeling.ModelingResources;
  24
  25
  26 /**
  27  * This query returns all subscription items for a collection of subscriptions.
  28  */
  29 public class SubscriptionItemsQuery extends UniqueRead<Set<Resource>> {
  30
  31         Collection<Resource> resources;
  32
  33     public SubscriptionItemsQuery(Collection<Resource> resources) {
  34         super();
  35         this.resources = resources;
  36     }
  37
  38     @Override
  39     public Set<Resource> perform(ReadGraph graph) throws DatabaseException {
  40
  41         Set<Resource> result = new HashSet<Resource>();
  42         ModelingResources MOD = ModelingResources.getInstance(graph);
  43         Layer0 L0 = Layer0.getInstance(graph);
  44
  45         for (Resource r : resources) {
  46                 if ( graph.isInstanceOf(r, MOD.Subscription_Item)) result.add(r);
  47                 else if ( graph.isInstanceOf(r, MOD.Subscription)) {
  48                         for (Resource rr : graph.getObjects(r, L0.ConsistsOf)) {
  49                         if ( graph.isInstanceOf(rr, MOD.Subscription_Item)) result.add(rr);
  50                         }
  51                 }
  52         }
  53
  54         return result;
  55
  56     }
  57 }