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[simantics/platform.git] / bundles / org.simantics.db.common / src / org / simantics / db / common / request / PropertyDataType.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.databoard.Bindings;\r
15 import org.simantics.databoard.type.Datatype;\r
16 import org.simantics.db.ReadGraph;\r
17 import org.simantics.db.Resource;\r
18 import org.simantics.db.exception.DatabaseException;\r
19 import org.simantics.layer0.Layer0;\r
20 \r
21 public class PropertyDataType extends ResourceRead2<Datatype> {\r
22 \r
23         public PropertyDataType(Resource resource, Resource property) {\r
24                 super(resource, property);\r
25         }\r
26 \r
27         @Override\r
28         public Datatype perform(ReadGraph graph) throws DatabaseException {\r
29                 Layer0 l0 = Layer0.getInstance(graph);\r
30                 Resource value = graph.getPossibleObject(resource, resource2);\r
31                 if(value == null) return null;\r
32                 return graph.getPossibleRelatedValue(value, l0.HasDataType, Bindings.getBindingUnchecked(Datatype.class));\r
33         }\r
34 \r
35 }\r