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

   1 /*******************************************************************************\r
   2  * Copyright (c) 2007, 2011 Association for Decentralized Information Management in\r
   3  * Industry THTH ry.\r
   4  * All rights reserved. This program and the accompanying materials\r
   5  * are made available under the terms of the Eclipse Public License v1.0\r
   6  * which accompanies this distribution, and is available at\r
   7  * http://www.eclipse.org/legal/epl-v10.html\r
   8  *\r
   9  * Contributors:\r
  10  *     VTT Technical Research Centre of Finland - initial API and implementation\r
  11  *******************************************************************************/\r
  12 package org.simantics.modeling.subscription;\r
  13 \r
  14 import org.simantics.databoard.Databoard;\r
  15 import org.simantics.databoard.binding.Binding;\r
  16 import org.simantics.db.ReadGraph;\r
  17 import org.simantics.db.Resource;\r
  18 import org.simantics.db.common.request.UniqueRead;\r
  19 import org.simantics.db.exception.DatabaseException;\r
  20 import org.simantics.db.layer0.variable.RVI;\r
  21 import org.simantics.layer0.Layer0;\r
  22 import org.simantics.modeling.ModelingResources;\r
  23 \r
  24 /**\r
  25  * This query finds subscription items by variable reference\r
  26  * \r
  27  * @author toni.kalajainen\r
  28  */\r
  29 public class FindSubscriptionItem extends UniqueRead<Resource> {\r
  30 \r
  31         Resource subscription;\r
  32         RVI rvi;\r
  33         \r
  34         public FindSubscriptionItem(Resource subscription, RVI rvi) {\r
  35                 super();\r
  36                 this.subscription = subscription;\r
  37                 this.rvi = rvi;\r
  38         }\r
  39 \r
  40         @Override\r
  41         public Resource perform(ReadGraph graph) throws DatabaseException {\r
  42         Layer0 L0 = Layer0.getInstance(graph);\r
  43         ModelingResources MOD = ModelingResources.getInstance(graph);\r
  44 \r
  45         Binding rviBinding = graph.getService(Databoard.class).getBindingUnchecked( RVI.class );\r
  46         for (Resource r : graph.getObjects(subscription, L0.ConsistsOf))\r
  47         {\r
  48                 if ( !graph.isInstanceOf(r, MOD.Subscription_Item) ) continue;\r
  49                 \r
  50                 RVI _rvi = (RVI) graph.getPossibleRelatedValue(r, MOD.Subscription_Item_VariableId, rviBinding);\r
  51                 if (_rvi.equals(rvi)) return r;\r
  52         }\r
  53 \r
  54                 return null;\r
  55         }\r
  56         \r
  57     @Override\r
  58     public int hashCode() {\r
  59         return rvi.hashCode() + subscription.hashCode();\r
  60     }\r
  61 \r
  62     @Override\r
  63     public boolean equals(Object object) {\r
  64         if (this == object) return true;\r
  65         if (object == null) return false;\r
  66         if (getClass() != object.getClass()) return false;\r
  67         FindSubscriptionItem r = (FindSubscriptionItem) object;\r
  68         \r
  69         return subscription.equals(r.subscription) && rvi.equals(r.rvi);\r
  70     }\r
  71         \r
  72 \r
  73 \r
  74 }\r