1 /*******************************************************************************
2 * Copyright (c) 2007, 2010 Association for Decentralized Information Management
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
10 * VTT Technical Research Centre of Finland - initial API and implementation
11 *******************************************************************************/
12 package org.simantics.browsing.ui.graph.impl;
14 import org.simantics.browsing.ui.BuiltinKeys;
15 import org.simantics.browsing.ui.BuiltinKeys.ViewpointKey;
16 import org.simantics.browsing.ui.NodeContext;
17 import org.simantics.browsing.ui.PrimitiveQueryUpdater;
18 import org.simantics.browsing.ui.content.Viewpoint;
19 import org.simantics.browsing.ui.content.ViewpointFactory;
20 import org.simantics.db.ReadGraph;
21 import org.simantics.db.Resource;
22 import org.simantics.db.exception.DatabaseException;
23 import org.simantics.layer0.Layer0;
25 public class ConsistsOfViewpointFactory implements ViewpointFactory {
28 public Viewpoint create(PrimitiveQueryUpdater updater, final NodeContext context, ViewpointKey key) {
29 assert(updater != null);
30 assert(context != null);
32 return new LazyViewpoint(updater, context, key) {
34 public NodeContext[] children(ReadGraph graph) throws DatabaseException {
35 Layer0 L0 = Layer0.getInstance(graph);
36 return toContextsWithInput(graph.getObjects((Resource) context.getConstant(BuiltinKeys.INPUT), L0.ConsistsOf));
40 public Boolean hasChildren(ReadGraph graph) throws DatabaseException {
41 return Boolean.valueOf(children(graph).length > 0);
47 public String toString() {