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[simantics/platform.git] / bundles / org.simantics.db.common / src / org / simantics / db / common / request / IsParent.java
1 /*******************************************************************************\r
2  * Copyright (c) 2007, 2010 Association for Decentralized Information Management\r
3  * in 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.db.common.request;\r
13 \r
14 import org.simantics.db.ReadGraph;\r
15 import org.simantics.db.Resource;\r
16 import org.simantics.db.exception.DatabaseException;\r
17 import org.simantics.layer0.Layer0;\r
18 \r
19 /**\r
20  * @author Antti Villberg\r
21  */\r
22 public class IsParent extends ResourceRead2<Boolean> {\r
23 \r
24     public IsParent(Resource possibleParent, Resource possibleChild) {\r
25         super(possibleParent, possibleChild);\r
26     }\r
27 \r
28     @Override\r
29     public Boolean perform(ReadGraph graph) throws DatabaseException {\r
30         \r
31         if(resource.equals(resource2)) return true;\r
32         \r
33         Layer0 L0 = Layer0.getInstance(graph);\r
34         Resource parent = graph.getPossibleObject(resource2, L0.PartOf);\r
35         if(parent == null) return false;\r
36         \r
37         return graph.sync(new IsParent(resource, parent));\r
38         \r
39     }\r
40 \r
41 }\r