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[simantics/platform.git] / bundles / org.simantics.db.common / src / org / simantics / db / common / request / PossibleObjectWithName.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 final public class PossibleObjectWithName extends TernaryRead<Resource, Resource, String, Resource> {\r
20 \r
21     public PossibleObjectWithName(Resource resource, Resource predicate, String name) {\r
22         super(resource, predicate, name);\r
23     }\r
24 \r
25     @Override\r
26     public Resource perform(ReadGraph graph) throws DatabaseException {\r
27         Layer0 b = Layer0.getInstance(graph);\r
28         Resource result = null;\r
29         for(Resource object : graph.getObjects(parameter, parameter2)) {\r
30                 String name = graph.getPossibleRelatedValue(object, b.HasName);\r
31             if(parameter3.equals(name)) {\r
32                 if(result != null) return null;\r
33                 result = object;\r
34             }\r
35         }\r
36         return result;\r
37     }\r
38 \r
39 }\r