--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/artifacts/src/main/java/org/dive4elements/river/artifacts/common/AbstractCalculationListResults.java	Thu Jun 14 16:56:31 2018 +0200
@@ -0,0 +1,50 @@
+/** 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.common;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+
+import org.apache.commons.lang.math.DoubleRange;
+import org.dive4elements.river.artifacts.model.Calculation;
+import org.dive4elements.river.artifacts.sinfo.util.RiverInfo;
+
+/**
+ * @author Gernot Belger
+ */
+public abstract class AbstractCalculationListResults<RESULT extends AbstractCalculationResult> extends AbstractCalculationResults {
+
+    private static final long serialVersionUID = 1L;
+
+    private final List<RESULT> results = new ArrayList<>();
+
+    public AbstractCalculationListResults(final String calcModeLabel, final String user, final RiverInfo river, final DoubleRange calcRange) {
+        super(calcModeLabel, user, river, calcRange);
+    }
+
+    public final void addResult(final RESULT result, final Calculation problems) {
+        /* we assume error reporting was already done in this case */
+        if (result == null)
+            return;
+
+        if (result.isEmpty()) {
+            problems.addProblem("abstractsinfocalculationresults.emptyResult", result.getLabel());
+            return;
+        }
+
+        this.results.add(result);
+    }
+
+    public final List<RESULT> getResults() {
+        return Collections.unmodifiableList(this.results);
+    }
+
+}
\ No newline at end of file