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[simantics/platform.git] / bundles / org.simantics.db.common / src / org / simantics / db / common / request / MappedRelated.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 java.util.HashMap;\r
15 import java.util.Map;\r
16 \r
17 import org.simantics.db.ReadGraph;\r
18 import org.simantics.db.Resource;\r
19 import org.simantics.db.exception.DatabaseException;\r
20 import org.simantics.operation.Layer0X;\r
21 \r
22 /**\r
23  * Given an input resource that consists of resources representing other\r
24  * resources, return a map: represented resource -> representing resource.\r
25  * \r
26  * @author Antti Villberg\r
27  */\r
28 public class MappedRelated extends ResourceRead2<Map<Resource, Resource>> {\r
29 \r
30     public MappedRelated(Resource flat, Resource relation) {\r
31         super(flat, relation);\r
32     }\r
33 \r
34     @Override\r
35     public Map<Resource, Resource> perform(ReadGraph graph) throws DatabaseException {\r
36 \r
37         Layer0X L0X = Layer0X.getInstance(graph);\r
38         Map<Resource, Resource> result = new HashMap<Resource, Resource>();\r
39 \r
40         for (Resource part : graph.getObjects(resource, resource2)) {\r
41             Resource represents = graph.getPossibleObject(part, L0X.Represents);\r
42             if (represents != null)\r
43                 result.put(represents, part);\r
44         }\r
45 \r
46         return result;\r
47 \r
48     }\r
49 \r
50 }\r