--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/artifacts/src/main/java/org/dive4elements/river/artifacts/sinfo/collision/CollisionCalculation.java	Mon May 14 14:59:10 2018 +0200
@@ -0,0 +1,57 @@
+/* Copyright (C) 2017 by Bundesanstalt für Gewässerkunde
+ * Software engineering by
+ *  Björnsen Beratende Ingenieure GmbH
+ *  Dr. Schumacher Ingenieurbüro für Wasser und Umwelt
+ *
+ * This file is Free Software under the GNU AGPL (>=v3)
+ * and comes with ABSOLUTELY NO WARRANTY! Check out the
+ * documentation coming with Dive4Elements River for details.
+ */
+package org.dive4elements.river.artifacts.sinfo.collision;
+
+import org.apache.commons.lang.math.DoubleRange;
+import org.dive4elements.artifacts.CallContext;
+import org.dive4elements.river.artifacts.model.Calculation;
+import org.dive4elements.river.artifacts.model.CalculationResult;
+import org.dive4elements.river.artifacts.resources.Resources;
+import org.dive4elements.river.artifacts.sinfo.SINFOArtifact;
+import org.dive4elements.river.artifacts.sinfo.common.RiverInfoProvider;
+import org.dive4elements.river.artifacts.sinfo.util.CalculationUtils;
+import org.dive4elements.river.artifacts.sinfo.util.RiverInfo;
+import org.dive4elements.river.model.River;
+
+class CollisionCalculation {
+
+    // private static Logger log = Logger.getLogger(FloodDurationCalculation.class);
+
+    private final CallContext context;
+
+    public CollisionCalculation(final CallContext context) {
+        this.context = context;
+    }
+
+    public CalculationResult calculate(final SINFOArtifact sinfo) {
+
+        final String user = CalculationUtils.findArtifactUser(this.context, sinfo);
+
+        /* access input data */
+        final CollisionAccess access = new CollisionAccess(sinfo);
+        final River river = access.getRiver();
+        final RiverInfo riverInfo = new RiverInfo(river);
+
+        final DoubleRange calcRange = access.getRange();
+
+        /* calculate results for each diff pair */
+        final Calculation problems = new Calculation();
+
+        final RiverInfoProvider infoProvider = RiverInfoProvider.forRange(this.context, river, calcRange);
+
+        final String calcModeLabel = Resources.getMsg(this.context.getMeta(), sinfo.getCalculationMode().name());
+
+        final int[] years = access.getYears();
+        final int[][] epochs = access.getEpochs();
+
+        return null; // new CalculationResult(results, problems);
+    }
+
+}
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