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
10 * VTT Technical Research Centre of Finland - initial API and implementation
\r
11 *******************************************************************************/
\r
12 package org.simantics.browsing.ui.graph.impl;
\r
14 import java.util.Collection;
\r
15 import java.util.Collections;
\r
17 import org.eclipse.core.runtime.IAdaptable;
\r
18 import org.simantics.browsing.ui.BuiltinKeys;
\r
19 import org.simantics.browsing.ui.NodeContext;
\r
20 import org.simantics.browsing.ui.NodeContext.PrimitiveQueryKey;
\r
21 import org.simantics.browsing.ui.graph.impl.CommonKeys.RelatedObjectsKey;
\r
22 import org.simantics.db.ReadGraph;
\r
23 import org.simantics.db.Resource;
\r
24 import org.simantics.db.exception.DatabaseException;
\r
25 import org.simantics.utils.Container;
\r
28 * @author Tuukka Lehtonen
\r
30 public class RelatedObjectsQueryProcessor extends LazyGraphQueryProcessor<Collection<Resource>> {
\r
33 public String toString() {
\r
34 return "RelatedObjectsProcessor";
\r
38 public Object getIdentifier() {
\r
39 return CommonKeys.RelatedObjectsKey.class;
\r
43 protected Collection<Resource> initial() {
\r
44 return Collections.emptySet();
\r
48 protected Collection<Resource> compute(ReadGraph graph, NodeContext context, PrimitiveQueryKey<Container<Collection<Resource>>> key) throws DatabaseException {
\r
49 Object input = context.getConstant(BuiltinKeys.INPUT);
\r
50 Resource subject = adaptToSingle(input, Resource.class);
\r
52 RelatedObjectsKey k = (RelatedObjectsKey) key;
\r
53 final Resource relation = k.getParameter(0);
\r
54 if (relation == null)
\r
55 return Collections.emptyList();
\r
57 return graph.getObjects(subject, relation);
\r
60 @SuppressWarnings("unchecked")
\r
61 public static <T> T adaptToSingle(Object o, Class<T> clazz) {
\r
62 if (clazz.isInstance(o)) {
\r
64 } else if (o instanceof IAdaptable) {
\r
65 IAdaptable a = (IAdaptable) o;
\r
66 return (T) a.getAdapter(clazz);
\r
67 } else if (o instanceof Container<?>) {
\r
68 Object obj = ((Container<?>) o).get();
\r
71 return adaptToSingle(obj, clazz);
\r