1 /*******************************************************************************
\r
2 * Copyright (c) 2007, 2011 Association for Decentralized Information Management in
\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
10 * VTT Technical Research Centre of Finland - initial API and implementation
\r
11 *******************************************************************************/
\r
12 package org.simantics.modeling.subscription;
\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
25 * This query finds subscription items by variable reference
\r
27 * @author toni.kalajainen
\r
29 public class FindSubscriptionItem extends UniqueRead<Resource> {
\r
31 Resource subscription;
\r
34 public FindSubscriptionItem(Resource subscription, RVI rvi) {
\r
36 this.subscription = subscription;
\r
41 public Resource perform(ReadGraph graph) throws DatabaseException {
\r
42 Layer0 L0 = Layer0.getInstance(graph);
\r
43 ModelingResources MOD = ModelingResources.getInstance(graph);
\r
45 Binding rviBinding = graph.getService(Databoard.class).getBindingUnchecked( RVI.class );
\r
46 for (Resource r : graph.getObjects(subscription, L0.ConsistsOf))
\r
48 if ( !graph.isInstanceOf(r, MOD.Subscription_Item) ) continue;
\r
50 RVI _rvi = (RVI) graph.getPossibleRelatedValue(r, MOD.Subscription_Item_VariableId, rviBinding);
\r
51 if (_rvi.equals(rvi)) return r;
\r
58 public int hashCode() {
\r
59 return rvi.hashCode() + subscription.hashCode();
\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
69 return subscription.equals(r.subscription) && rvi.equals(r.rvi);
\r