--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/flys-artifacts/src/main/java/org/dive4elements/river/artifacts/model/minfo/SedimentDensityFactory.java	Thu Apr 25 12:06:39 2013 +0200
@@ -0,0 +1,92 @@
+package org.dive4elements.river.artifacts.model.minfo;
+
+import java.util.List;
+
+import net.sf.ehcache.Cache;
+import net.sf.ehcache.Element;
+
+import org.apache.log4j.Logger;
+import org.hibernate.SQLQuery;
+import org.hibernate.Session;
+import org.hibernate.type.StandardBasicTypes;
+
+import org.dive4elements.river.artifacts.cache.CacheFactory;
+import org.dive4elements.river.backend.SessionHolder;
+
+
+public class SedimentDensityFactory
+{
+    /** Private logger to use here. */
+    private static Logger log = Logger.getLogger(SedimentDensityFactory.class);
+
+    private static final String DENSITY_CACHE_NAME = "sedimentdensity";
+
+    /**Query to get sediment density values and kms. */
+    private static final String SQL_SELECT_DENSITY =
+        "SELECT sdv.station AS km, " +
+        "       sdv.density AS density," +
+        "       sdv.year AS year " +
+        "   FROM sediment_density sd" +
+        "       JOIN rivers r ON sd.river_id = r.id " +
+        "       JOIN sediment_density_values sdv ON sd.id = sdv.sediment_density_id" +
+        "   WHERE r.name = :name";
+
+    private SedimentDensityFactory() {}
+
+    public static SedimentDensity getSedimentDensity(
+        String river,
+        double startKm,
+        double endKm,
+        int year
+    ) {
+        log.debug("getSedimentDensity");
+        Cache cache = CacheFactory.getCache(DENSITY_CACHE_NAME);
+
+        if (cache == null) {
+            log.debug("Cache not configured.");
+            return getSedimentDensityUncached(river, startKm, endKm, year);
+        }
+
+        String key = river + startKm + endKm;
+        Element element = cache.get(key);
+        if (element != null) {
+            log.debug("SedimentDensity found in cache!");
+            return (SedimentDensity)element.getValue();
+        }
+        SedimentDensity value =
+            getSedimentDensityUncached(river, startKm, endKm, year);
+
+        if (value != null && key != null) {
+            log.debug("Store sediment density values in cache.");
+            element = new Element(key, value);
+            cache.put(element);
+        }
+        return value;
+    }
+
+    private static SedimentDensity getSedimentDensityUncached(
+        String river,
+        double startKm,
+        double endKm,
+        int year
+    ) {
+        log.debug("getSedimentDensityUncached");
+        List<Object[]> results = null;
+        Session session = SessionHolder.HOLDER.get();
+        SQLQuery sqlQuery = session.createSQLQuery(SQL_SELECT_DENSITY)
+            .addScalar("km", StandardBasicTypes.DOUBLE)
+            .addScalar("density", StandardBasicTypes.DOUBLE)
+            .addScalar("year", StandardBasicTypes.INTEGER);
+        sqlQuery.setString("name", river);
+        results = sqlQuery.list();
+        SedimentDensity density = new SedimentDensity();
+        for (Object[] row : results) {
+            if (row[0] != null && row[1] != null && row[2] != null) {
+                density.addDensity((Double)row[0], (Double)row[1], (Integer)row[2]);
+            }
+        }
+
+        density.cleanUp();
+        return density;
+    }
+}