Fixed all line endings of the repository
[simantics/platform.git] / bundles / org.simantics.browsing.ui.graph / src / org / simantics / browsing / ui / graph / tester / HasRelatedObjectsTester.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.browsing.ui.graph.tester;
13
14 import java.util.Collection;
15
16 import org.simantics.browsing.ui.NodeContext;
17 import org.simantics.browsing.ui.NodeQueryManager;
18 import org.simantics.browsing.ui.Tester;
19 import org.simantics.browsing.ui.graph.impl.CommonKeys;
20 import org.simantics.db.ReadGraph;
21 import org.simantics.db.RequestProcessor;
22 import org.simantics.db.Resource;
23 import org.simantics.db.common.request.ReadRequest;
24 import org.simantics.db.exception.DatabaseException;
25 import org.simantics.utils.Container;
26
27 /**
28  * @author Tuukka Lehtonen
29  */
30 public class HasRelatedObjectsTester implements Tester {
31
32     private Resource relation;
33
34     public HasRelatedObjectsTester(Resource relation) {
35         this.relation = relation;
36     }
37
38     public HasRelatedObjectsTester(RequestProcessor processor, final String relationUri) throws DatabaseException {
39         processor.syncRequest(new ReadRequest() {
40             @Override
41             public void run(ReadGraph graph) throws DatabaseException {
42                 relation = graph.getResource(relationUri);
43             }
44         });
45     }
46
47     @Override
48     public boolean test(NodeQueryManager manager, NodeContext context) {
49         Container<Collection<Resource>> objects = manager.query(context, new CommonKeys.RelatedObjectsKey(relation));
50         return !objects.get().isEmpty();
51     }
52
53 }