bundles/org.simantics.modeling/src/org/simantics/modeling/subscription/FindSubscriptionItem.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 org.simantics.databoard.Databoard;
  15 import org.simantics.databoard.binding.Binding;
  16 import org.simantics.db.ReadGraph;
  17 import org.simantics.db.Resource;
  18 import org.simantics.db.common.request.UniqueRead;
  19 import org.simantics.db.exception.DatabaseException;
  20 import org.simantics.db.layer0.variable.RVI;
  21 import org.simantics.layer0.Layer0;
  22 import org.simantics.modeling.ModelingResources;
  23
  24 /**
  25  * This query finds subscription items by variable reference
  26  *
  27  * @author toni.kalajainen
  28  */
  29 public class FindSubscriptionItem extends UniqueRead<Resource> {
  30
  31         Resource subscription;
  32         RVI rvi;
  33
  34         public FindSubscriptionItem(Resource subscription, RVI rvi) {
  35                 super();
  36                 this.subscription = subscription;
  37                 this.rvi = rvi;
  38         }
  39
  40         @Override
  41         public Resource perform(ReadGraph graph) throws DatabaseException {
  42         Layer0 L0 = Layer0.getInstance(graph);
  43         ModelingResources MOD = ModelingResources.getInstance(graph);
  44
  45         Binding rviBinding = graph.getService(Databoard.class).getBindingUnchecked( RVI.class );
  46         for (Resource r : graph.getObjects(subscription, L0.ConsistsOf))
  47         {
  48                 if ( !graph.isInstanceOf(r, MOD.Subscription_Item) ) continue;
  49
  50                 RVI _rvi = (RVI) graph.getPossibleRelatedValue(r, MOD.Subscription_Item_VariableId, rviBinding);
  51                 if (_rvi.equals(rvi)) return r;
  52         }
  53
  54                 return null;
  55         }
  56
  57     @Override
  58     public int hashCode() {
  59         return rvi.hashCode() + subscription.hashCode();
  60     }
  61
  62     @Override
  63     public boolean equals(Object object) {
  64         if (this == object) return true;
  65         if (object == null) return false;
  66         if (getClass() != object.getClass()) return false;
  67         FindSubscriptionItem r = (FindSubscriptionItem) object;
  68
  69         return subscription.equals(r.subscription) && rvi.equals(r.rvi);
  70     }
  71
  72
  73
  74 }