Migrated source code from Simantics SVN

[simantics/platform.git] / bundles / org.simantics.charts / src / org / simantics / charts / query / NextChartItemIndexQuery.java

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 (file)
index 0000000..b9d52e1
--- /dev/null
+++ b/bundles/org.simantics.charts/src/org/simantics/charts/query/NextChartItemIndexQuery.java
@@ -0,0 +1,48 @@
+/*******************************************************************************\r
+ * Copyright (c) 2007, 2011 Association for Decentralized Information Management in\r
+ * Industry THTH ry.\r
+ * All rights reserved. This program and the accompanying materials\r
+ * are made available under the terms of the Eclipse Public License v1.0\r
+ * which accompanies this distribution, and is available at\r
+ * http://www.eclipse.org/legal/epl-v10.html\r
+ *\r
+ * Contributors:\r
+ *     VTT Technical Research Centre of Finland - initial API and implementation\r
+ *******************************************************************************/\r
+package org.simantics.charts.query;\r
+\r
+import org.simantics.charts.ontology.ChartResource;\r
+import org.simantics.db.ReadGraph;\r
+import org.simantics.db.Resource;\r
+import org.simantics.db.common.request.Queries;\r
+import org.simantics.db.common.request.ResourceRead;\r
+import org.simantics.db.exception.DatabaseException;\r
+import org.simantics.layer0.Layer0;\r
+\r
+/**\r
+ * Query to chart for next available item index.\r
+ * This is the largest item index found + 1.\r
+ * \r
+ * @author toni.kalajainen\r
+ */\r
+public class NextChartItemIndexQuery extends ResourceRead<Integer> {\r
+\r
+       public NextChartItemIndexQuery(Resource resource) {\r
+               super(resource);\r
+       }\r
+\r
+       @Override\r
+       public Integer perform(ReadGraph graph) throws DatabaseException {\r
+        Layer0 L0 = Layer0.getInstance(graph);\r
+        ChartResource CHART = ChartResource.getInstance(graph);\r
+               \r
+        int largest = 0;\r
+        for (Resource item : graph.syncRequest(Queries.objectsWithType(resource, L0.ConsistsOf, CHART.Chart_Item))) {\r
+               Integer index = graph.getPossibleRelatedValue(item, CHART.Chart_Item_Index);\r
+               if (index != null) largest = Math.max(largest, index);\r
+        }\r
+        \r
+               return largest+1;\r
+       }\r
+\r
+}\r