1 /*******************************************************************************
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2 * Copyright (c) 2007, 2011 Association for Decentralized Information Management in
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4 * All rights reserved. This program and the accompanying materials
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5 * are made available under the terms of the Eclipse Public License v1.0
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6 * which accompanies this distribution, and is available at
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7 * http://www.eclipse.org/legal/epl-v10.html
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10 * VTT Technical Research Centre of Finland - initial API and implementation
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11 *******************************************************************************/
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12 package org.simantics.charts.query;
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14 import org.simantics.charts.ontology.ChartResource;
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15 import org.simantics.db.ReadGraph;
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16 import org.simantics.db.Resource;
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17 import org.simantics.db.common.request.Queries;
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18 import org.simantics.db.common.request.ResourceRead;
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19 import org.simantics.db.exception.DatabaseException;
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20 import org.simantics.layer0.Layer0;
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23 * Query to chart for next available item index.
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24 * This is the largest item index found + 1.
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26 * @author toni.kalajainen
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28 public class NextChartItemIndexQuery extends ResourceRead<Integer> {
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30 public NextChartItemIndexQuery(Resource resource) {
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35 public Integer perform(ReadGraph graph) throws DatabaseException {
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36 Layer0 L0 = Layer0.getInstance(graph);
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37 ChartResource CHART = ChartResource.getInstance(graph);
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40 for (Resource item : graph.syncRequest(Queries.objectsWithType(resource, L0.ConsistsOf, CHART.Chart_Item))) {
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41 Integer index = graph.getPossibleRelatedValue(item, CHART.Chart_Item_Index);
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42 if (index != null) largest = Math.max(largest, index);
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