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[simantics/platform.git] / bundles / org.simantics.browsing.ui.graph.impl / src / org / simantics / browsing / ui / graph / impl / request / GetLabel.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.browsing.ui.graph.impl.request;\r
13 \r
14 import org.simantics.databoard.Bindings;\r
15 import org.simantics.db.ReadGraph;\r
16 import org.simantics.db.Resource;\r
17 import org.simantics.db.common.request.ResourceRead;\r
18 import org.simantics.db.common.utils.NameUtils;\r
19 import org.simantics.db.exception.DatabaseException;\r
20 import org.simantics.db.exception.ValidationException;\r
21 import org.simantics.layer0.Layer0;\r
22 \r
23 /**\r
24  * @author Tuukka Lehtonen\r
25  */\r
26 public class GetLabel extends ResourceRead<String> {\r
27 \r
28     public GetLabel(Resource r) {\r
29         super(r);\r
30     }\r
31 \r
32     @Override\r
33     public String perform(ReadGraph graph) throws DatabaseException {\r
34         Layer0 l0 = Layer0.getInstance(graph);\r
35         String label = graph.getPossibleRelatedValue(resource, l0.HasLabel, Bindings.STRING);\r
36         if (label == null)\r
37             label = graph.getPossibleRelatedValue(resource, l0.HasName, Bindings.STRING);\r
38         if (label == null) {\r
39             String rep = NameUtils.getSafeName(graph, resource);\r
40             throw new ValidationException("Resource '" + rep + "' does not have a Label or a Name property.");\r
41         }\r
42         return label;\r
43     }\r
44 \r
45 }\r