1 /*******************************************************************************
2 * Copyright (c) 2007, 2011 Association for Decentralized Information Management in
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.charts.query;
14 import org.simantics.charts.ontology.ChartResource;
15 import org.simantics.db.ReadGraph;
16 import org.simantics.db.Resource;
17 import org.simantics.db.common.request.Queries;
18 import org.simantics.db.common.request.ResourceRead;
19 import org.simantics.db.exception.DatabaseException;
20 import org.simantics.layer0.Layer0;
23 * Query to chart for next available item index.
24 * This is the largest item index found + 1.
26 * @author toni.kalajainen
28 public class NextChartItemIndexQuery extends ResourceRead<Integer> {
30 public NextChartItemIndexQuery(Resource resource) {
35 public Integer perform(ReadGraph graph) throws DatabaseException {
36 Layer0 L0 = Layer0.getInstance(graph);
37 ChartResource CHART = ChartResource.getInstance(graph);
40 for (Resource item : graph.syncRequest(Queries.objectsWithType(resource, L0.ConsistsOf, CHART.Chart_Item))) {
41 Integer index = graph.getPossibleRelatedValue(item, CHART.Chart_Item_Index);
42 if (index != null) largest = Math.max(largest, index);