--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/artifacts/src/main/java/org/dive4elements/river/artifacts/common/AbstractCommonListExporter.java	Thu Jun 14 16:56:31 2018 +0200
@@ -0,0 +1,117 @@
+/** 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.Collection;
+
+import org.dive4elements.river.artifacts.sinfo.util.RiverInfo;
+
+import au.com.bytecode.opencsv.CSVWriter;
+
+/**
+ * @author Gernot Belger
+ */
+public abstract class AbstractCommonListExporter<RESULT extends AbstractCalculationResult, RESULTS extends AbstractCalculationListResults<RESULT>> extends AbstractCommonExporter<RESULTS> {
+
+    /** The storage that contains the current calculation result. */
+    protected static enum ExportMode {
+        pdf, csv
+    }
+
+    @Override
+    protected void doWriteCSVData(final CSVWriter writer, final RESULTS results) {
+
+        getLog().info("writeCSVData");
+
+        /* write as csv */
+        writeCSVGlobalMetadata(writer, results);
+
+        writer.writeNext(new String[] { "" }); // break line HERE to avoid redundance
+        final RiverInfo river = results.getRiver();
+        // FIXME :with comment if not first result
+        writeCSVHeader(writer, results, river);
+        writer.writeNext(new String[] { "" }); // break line HERE to avoid redundance
+
+        for (final RESULT result : results.getResults()) {
+            writeCSVResult(writer, results, result);
+            writer.writeNext(new String[] { "" }); // break line HERE after each resultset
+        }
+    }
+
+    protected abstract void writeCSVHeader(final CSVWriter writer, final RESULTS results, final RiverInfo river);
+
+    /**
+     * Add metadata that is once written to the top of the file.
+     */
+    protected abstract void writeCSVGlobalMetadata(final CSVWriter writer, final RESULTS results);
+
+    private final void writeCSVResult(final CSVWriter writer, final RESULTS results, final RESULT result) {
+
+        writeCSVResultMetadata(writer, results, result);
+        // wenn resultsmetadata null sind!? keine neue zeile
+        // writer.writeNext(new String[] { "" }); // break line in den Implementationen,
+        // weil es sein kann, dass KEINE ResultMetadata geschrieben werden; dann wäre eine Leerzeile überflüssig
+
+        /* now the value rows */
+        final Collection<ResultRow> rows = result.getRows();
+        for (final ResultRow row : rows)
+            writeCSVRow(writer, results, result, row);
+    }
+
+    /**
+     * Add metadata that is written once per result set.
+     */
+    protected abstract void writeCSVResultMetadata(CSVWriter writer, RESULTS results, RESULT result);
+
+    protected void writeCSVRow(final CSVWriter writer, final RESULTS results, final RESULT result, final ResultRow row) {
+        getLog().debug("writeCSVFlowDepthRow");
+
+        final String[] formattedRow = formatCSVRow(results, row);
+        writer.writeNext(formattedRow);
+    }
+
+    protected final String[] formatCSVRow(final RESULTS results, final ResultRow row) {
+        return formatRow(results, row, ExportMode.csv);
+    }
+
+    protected final MetaAndTableJRDataSource createJRData() {
+
+        /* fetch calculation results */
+        final RESULTS results = getResults();
+
+        final MetaAndTableJRDataSource source = new MetaAndTableJRDataSource();
+
+        addJRMetaData(source, results);
+
+        for (final RESULT result : results.getResults())
+            addJRTableData(source, results, result);
+
+        return source;
+    }
+
+    protected abstract void addJRMetaData(final MetaAndTableJRDataSource source, final RESULTS results);
+
+    private void addJRTableData(final MetaAndTableJRDataSource source, final RESULTS results, final RESULT result) {
+
+        final Collection<ResultRow> rows = result.getRows();
+
+        for (final ResultRow row : rows) {
+
+            final String[] formattedRow = formatPDFRow(results, row);
+            source.addData(formattedRow);
+        }
+    }
+
+    protected abstract String[] formatRow(RESULTS results, ResultRow row, ExportMode mode);
+
+    private final String[] formatPDFRow(final RESULTS results, final ResultRow row) {
+        return formatRow(results, row, ExportMode.pdf);
+    }
+}
\ No newline at end of file