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Merge "Documented difference of RuntimeEnvironmentRequest and Runti...quest2" into...
[simantics/platform.git] / bundles / org.simantics.db.layer0 / src / org / simantics / db / layer0 / request / PossibleDiagram.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.layer0.request;
13
14 import org.simantics.db.ReadGraph;
15 import org.simantics.db.Resource;
16 import org.simantics.db.common.request.ResourceRead;
17 import org.simantics.db.common.utils.OrderedSetUtils;
18 import org.simantics.db.exception.DatabaseException;
19 import org.simantics.layer0.Layer0;
20 import org.simantics.scl.reflection.OntologyVersions;
21
22 public class PossibleDiagram extends ResourceRead<Resource> {
23
24     public PossibleDiagram(Resource component) {
25         super(component);
26     }
27
28     @Override
29     public Resource perform(ReadGraph graph) throws DatabaseException {
30
31         Layer0 l0 = Layer0.getInstance(graph);
32         String uri = OntologyVersions.getInstance().currentVersion("http://www.simantics.org/Modeling-0.0/ComponentToElement");
33         Resource map = graph.getResource(uri);
34         if(map == null)
35             return null;
36
37         Resource element = graph.getPossibleObject(resource, map);
38         if (element == null)
39             return null;
40
41         return OrderedSetUtils.getSingleOwnerList(graph, element, l0.OrderedSet);
42
43     }
44
45 }