X-Git-Url: https://gerrit.simantics.org/r/gitweb?a=blobdiff_plain;f=bundles%2Forg.simantics.charts%2Fsrc%2Forg%2Fsimantics%2Fcharts%2Fquery%2FNextChartItemIndexQuery.java;fp=bundles%2Forg.simantics.charts%2Fsrc%2Forg%2Fsimantics%2Fcharts%2Fquery%2FNextChartItemIndexQuery.java;h=b9d52e1580116f8e1a25b7ca7a3b17626c49d83f;hb=969bd23cab98a79ca9101af33334000879fb60c5;hp=0000000000000000000000000000000000000000;hpb=866dba5cd5a3929bbeae85991796acb212338a08;p=simantics%2Fplatform.git

diff --git a/bundles/org.simantics.charts/src/org/simantics/charts/query/NextChartItemIndexQuery.java b/bundles/org.simantics.charts/src/org/simantics/charts/query/NextChartItemIndexQuery.java
new file mode 100644
index 000000000..b9d52e158
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+++ b/bundles/org.simantics.charts/src/org/simantics/charts/query/NextChartItemIndexQuery.java
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+/*******************************************************************************
+ * Copyright (c) 2007, 2011 Association for Decentralized Information Management in
+ * Industry THTH ry.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     VTT Technical Research Centre of Finland - initial API and implementation
+ *******************************************************************************/
+package org.simantics.charts.query;
+
+import org.simantics.charts.ontology.ChartResource;
+import org.simantics.db.ReadGraph;
+import org.simantics.db.Resource;
+import org.simantics.db.common.request.Queries;
+import org.simantics.db.common.request.ResourceRead;
+import org.simantics.db.exception.DatabaseException;
+import org.simantics.layer0.Layer0;
+
+/**
+ * Query to chart for next available item index.
+ * This is the largest item index found + 1.
+ * 
+ * @author toni.kalajainen
+ */
+public class NextChartItemIndexQuery extends ResourceRead<Integer> {
+
+	public NextChartItemIndexQuery(Resource resource) {
+		super(resource);
+	}
+
+	@Override
+	public Integer perform(ReadGraph graph) throws DatabaseException {
+        Layer0 L0 = Layer0.getInstance(graph);
+        ChartResource CHART = ChartResource.getInstance(graph);
+		
+        int largest = 0;
+        for (Resource item : graph.syncRequest(Queries.objectsWithType(resource, L0.ConsistsOf, CHART.Chart_Item))) {
+        	Integer index = graph.getPossibleRelatedValue(item, CHART.Chart_Item_Index);
+        	if (index != null) largest = Math.max(largest, index);
+        }
+        
+		return largest+1;
+	}
+
+}