--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/flys-artifacts/src/main/java/de/intevation/flys/artifacts/model/minfo/BedQualityCalculation.java	Thu Sep 13 13:51:00 2012 +0000
@@ -0,0 +1,103 @@
+package de.intevation.flys.artifacts.model.minfo;
+
+import java.util.LinkedList;
+import java.util.List;
+
+import org.apache.log4j.Logger;
+
+import de.intevation.flys.artifacts.access.BedQualityAccess;
+import de.intevation.flys.artifacts.model.Calculation;
+import de.intevation.flys.artifacts.model.CalculationResult;
+import de.intevation.flys.artifacts.model.DateRange;
+import de.intevation.flys.backend.SedDBSessionHolder;
+
+
+public class BedQualityCalculation extends Calculation {
+
+    private static final Logger logger = Logger
+        .getLogger(BedQualityCalculation.class);
+
+    protected String river;
+    protected double from;
+    protected double to;
+    protected List<DateRange> ranges;
+
+    public BedQualityCalculation() {
+    }
+
+    public CalculationResult calculate(BedQualityAccess access) {
+        logger.info("BedQualityCalculation.calculate");
+
+        String river = access.getRiver();
+        Double from = access.getFrom();
+        Double to = access.getTo();
+        List<DateRange> ranges = access.getDateRanges();
+
+        if (river == null) {
+            // TODO: i18n
+            addProblem("minfo.missing.river");
+        }
+
+        if (from == null) {
+            // TODO: i18n
+            addProblem("minfo.missing.from");
+        }
+
+        if (to == null) {
+            // TODO: i18n
+            addProblem("minfo.missing.to");
+        }
+
+        if (ranges == null) {
+            // TODO: i18n
+            addProblem("minfo.missing.periods");
+        }
+
+        if (!hasProblems()) {
+            this.river = river;
+            this.from = from;
+            this.to = to;
+            this.ranges = ranges;
+
+            SedDBSessionHolder.acquire();
+            try {
+                return internalCalculate();
+            }
+            finally {
+                SedDBSessionHolder.release();
+            }
+        }
+
+        return new CalculationResult();
+    }
+
+    protected CalculationResult internalCalculate() {
+
+        List<BedQualityResult> results = new LinkedList<BedQualityResult>();
+        // Calculate for all time periods.
+        for (DateRange dr : ranges) {
+            QualityMeasurements bedMeasurements = QualityMeasurementFactory
+                .getBedMeasurements(river, from, to, dr.getFrom(), dr.getTo());
+            QualityMeasurements loadMeasurements = QualityMeasurementFactory
+                .getBedMeasurements(river, from, to, dr.getFrom(), dr.getTo());
+
+            BedQualityResult bedResult = calculateBed(bedMeasurements);
+            BedQualityResult loadResult = calculateBedload(loadMeasurements);
+            results.add(bedResult);
+            results.add(loadResult);
+        }
+
+        return new CalculationResult(
+            results.toArray(new BedQualityResult[results.size()]), this);
+    }
+
+    protected BedQualityResult calculateBed(QualityMeasurements qm) {
+        // TODO
+        return new BedQualityResult();
+    }
+
+    protected BedQualityResult calculateBedload(QualityMeasurements qm) {
+        // TODO
+        return new BedQualityResult();
+    }
+}