--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/flys-artifacts/src/main/java/org/dive4elements/river/artifacts/model/WKmsFactory.java	Thu Apr 25 12:06:39 2013 +0200
@@ -0,0 +1,152 @@
+package org.dive4elements.river.artifacts.model;
+
+import java.util.List;
+
+import net.sf.ehcache.Cache;
+import net.sf.ehcache.Element;
+
+import org.apache.log4j.Logger;
+
+import org.hibernate.Session;
+
+import org.hibernate.SQLQuery;
+import org.hibernate.type.StandardBasicTypes;
+
+import org.dive4elements.river.artifacts.cache.CacheFactory;
+
+import org.dive4elements.river.backend.SessionHolder;
+
+
+/**
+ * Factory to access ready-made WKms for other (than computed) 'kinds' of
+ * WST-data.
+ */
+public class WKmsFactory
+{
+    /** Private logger to use here. */
+    private static Logger log = Logger.getLogger(WKmsFactory.class);
+
+    /** Query to get km and ws for wst_id and column_pos. */
+    public static final String SQL_SELECT_WS =
+        "SELECT km, w FROM wst_w_values " +
+        "WHERE wst_id = :wst_id AND column_pos = :column_pos";
+
+    /** Query to get name for wst_id and column_pos. */
+    public static final String SQL_SELECT_NAME =
+        "SELECT name " +
+        "FROM wst_columns "+
+        "WHERE wst_id = :wst_id AND position = :column_pos";
+
+    /** Query to get name (description) for wst_id. */
+    public static final String SQL_SELECT_WST_NAME =
+        "SELECT description from wsts "+
+        "WHERE id = :wst_id";
+
+
+    private WKmsFactory() {
+    }
+
+
+    /**
+     * Get WKms for given column and wst_id, caring about the cache.
+     */
+    public static WKms getWKms(int column, int wst_id) {
+        log.debug("WKmsFactory.getWKms");
+        Cache cache = CacheFactory.getCache(StaticWKmsCacheKey.CACHE_NAME);
+
+        StaticWKmsCacheKey cacheKey;
+
+        if (cache != null) {
+            cacheKey = new StaticWKmsCacheKey(wst_id, column);
+            Element element = cache.get(cacheKey);
+            if (element != null) {
+                log.debug("Got static wst values from cache");
+                return (WKms)element.getValue();
+            }
+        }
+        else {
+            cacheKey = null;
+        }
+
+        WKms values = getWKmsUncached(column, wst_id);
+
+        if (values != null && cacheKey != null) {
+            log.debug("Store static wst values in cache.");
+            Element element = new Element(cacheKey, values);
+            cache.put(element);
+        }
+        return values;
+    }
+
+    /** Get name for a WKms. */
+    public static String getWKmsName(int wst_id) {
+        log.debug("WKmsFactory.getWKmsName wst_id/" + wst_id);
+
+        String name = null;
+        Session session = SessionHolder.HOLDER.get();
+
+        SQLQuery nameQuery = session.createSQLQuery(SQL_SELECT_WST_NAME)
+            .addScalar("description", StandardBasicTypes.STRING);
+        nameQuery.setInteger("wst_id",     wst_id);
+
+        List<String> names = nameQuery.list();
+        if (names.size() >= 1) {
+            name = names.get(0);
+        }
+
+        return name;
+    }
+
+    /** Get name for a WKms. */
+    public static String getWKmsName(int column, int wst_id) {
+        log.debug("WKmsFactory.getWKmsName c/" + column + ", wst_id/" + wst_id);
+
+        String name = null;
+        Session session = SessionHolder.HOLDER.get();
+
+        SQLQuery nameQuery = session.createSQLQuery(SQL_SELECT_NAME)
+            .addScalar("name", StandardBasicTypes.STRING);
+        nameQuery.setInteger("wst_id",     wst_id);
+        nameQuery.setInteger("column_pos", column);
+
+        List<String> names = nameQuery.list();
+        if (names.size() >= 1) {
+            name = names.get(0);
+        }
+
+        return name;
+    }
+
+
+    /**
+     * Get WKms from db.
+     * @param column the position columns value
+     * @param wst_id database id of the wst
+     * @return according WKms.
+     */
+    public static WKms getWKmsUncached(int column, int wst_id) {
+
+        if (log.isDebugEnabled()) {
+            log.debug("WKmsFactory.getWKmsUncached c/" + column + ", wst_id/" + wst_id);
+        }
+
+        WKmsImpl wkms = new WKmsImpl(getWKmsName(column, wst_id));
+
+        Session session = SessionHolder.HOLDER.get();
+        SQLQuery sqlQuery = session.createSQLQuery(SQL_SELECT_WS)
+            .addScalar("km", StandardBasicTypes.DOUBLE)
+            .addScalar("w",  StandardBasicTypes.DOUBLE);
+        sqlQuery.setInteger("wst_id",     wst_id);
+        sqlQuery.setInteger("column_pos", column);
+
+        List<Object []> results = sqlQuery.list();
+
+        for (int i = 0, N = results.size(); i < N; i++) {
+            Object[] row = results.get(i);
+            wkms.add((Double) row[0], (Double) row[1]);
+        }
+
+        return wkms;
+    }
+}
+// vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :