]> gerrit.simantics Code Review - simantics/platform.git/blob - bundles/org.simantics.db.common/src/org/simantics/db/common/request/MappedParts.java
Fixed multiple issues causing dangling references to discarded queries
[simantics/platform.git] / bundles / org.simantics.db.common / src / org / simantics / db / common / request / MappedParts.java
1 /*******************************************************************************
2  * Copyright (c) 2007, 2010 Association for Decentralized Information Management
3  * in Industry THTH ry.
4  * All rights reserved. This program and the accompanying materials
5  * are made available under the terms of the Eclipse Public License v1.0
6  * which accompanies this distribution, and is available at
7  * http://www.eclipse.org/legal/epl-v10.html
8  *
9  * Contributors:
10  *     VTT Technical Research Centre of Finland - initial API and implementation
11  *******************************************************************************/
12 package org.simantics.db.common.request;
13
14 import java.util.HashMap;
15 import java.util.Map;
16
17 import org.simantics.db.ReadGraph;
18 import org.simantics.db.Resource;
19 import org.simantics.db.exception.DatabaseException;
20 import org.simantics.layer0.Layer0;
21 import org.simantics.operation.Layer0X;
22
23 /**
24  * Given an input resource that consists of resources representing other
25  * resources, return a map: represented resource -> representing resource.
26  * 
27  * @author Antti Villberg
28  */
29 public class MappedParts extends ResourceRead<Map<Resource, Resource>> {
30
31     public MappedParts(Resource flat) {
32         super(flat);
33     }
34
35     @Override
36     public Map<Resource, Resource> perform(ReadGraph graph) throws DatabaseException {
37
38         Layer0 l0 = Layer0.getInstance(graph);
39         Layer0X L0X = Layer0X.getInstance(graph);
40         Map<Resource, Resource> result = new HashMap<Resource, Resource>();
41
42         for (Resource part : graph.getObjects(resource, l0.ConsistsOf)) {
43             Resource represents = graph.getPossibleObject(part, L0X.Represents);
44             if (represents != null)
45                 result.put(represents, part);
46         }
47
48         return result;
49
50     }
51
52 }