--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/artifacts/src/main/java/org/dive4elements/river/artifacts/model/WQKmsFactory.java	Thu Apr 25 15:23:37 2013 +0200
@@ -0,0 +1,199 @@
+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 WQKms for other (than computed) 'kinds' of
+ * WST-data.
+ */
+public class WQKmsFactory
+{
+    private static Logger log = Logger.getLogger(WQKmsFactory.class);
+
+    /** Query to get km and wqs for wst_id and column_pos. */
+    public static final String SQL_SELECT_WQS =
+        "SELECT position, w, q FROM wst_value_table " +
+        "WHERE wst_id = :wst_id AND column_pos = :column_pos";
+
+    /** Get wst_id and position from wst_columns. */
+    public static final String SQL_SELECT_COLUMN =
+        "SELECT wst_id, position FROM wst_columns WHERE id = :column_id";
+
+    /** Query to get name for wst_id and column_pos. */
+    public static final String SQL_SELECT_NAME =
+        "SELECT name " +
+        "FROM wst_columns "+
+        "WHERE id = :column_id";
+
+
+    /** Hidden constructor, use static methods instead. */
+    private WQKmsFactory() {
+    }
+
+
+    /**
+     * Get WKms for given column (pos) and wst_id, caring about the cache.
+     */
+    public static WQKms getWQKms(int columnPos, int wst_id) {
+        log.debug("WQKmsFactory.getWQKms");
+        Cache cache = CacheFactory.getCache(StaticWQKmsCacheKey.CACHE_NAME);
+
+        StaticWQKmsCacheKey cacheKey;
+
+        if (cache != null) {
+            cacheKey = new StaticWQKmsCacheKey(wst_id, columnPos);
+            Element element = cache.get(cacheKey);
+            if (element != null) {
+                log.debug("Got static wst values from cache");
+                return (WQKms)element.getValue();
+            }
+        }
+        else {
+            cacheKey = null;
+        }
+
+        WQKms values = getWQKmsUncached(columnPos, 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 WKms for given column (id), caring about the cache.
+     */
+    public static WQKms getWQKmsCID(int columnID) {
+        log.debug("WQKmsFactory.getWQKms");
+        Cache cache = CacheFactory.getCache(StaticWQKmsCacheKey.CACHE_NAME);
+
+        StaticWQKmsCacheKey cacheKey;
+
+        if (cache != null) {
+            cacheKey = new StaticWQKmsCacheKey(-columnID, -columnID);
+            Element element = cache.get(cacheKey);
+            if (element != null) {
+                log.debug("Got static wst values from cache");
+                return (WQKms)element.getValue();
+            }
+        }
+        else {
+            cacheKey = null;
+        }
+
+        int[] cInfo = getColumn(columnID);
+        if (cInfo == null) return null;
+        WQKms values = getWQKmsUncached(cInfo[1], cInfo[0]);
+
+
+        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 WQKms from db.
+     * @param column the position columns value
+     * @param wst_id database id of the wst
+     * @return respective WQKms.
+     */
+    public static WQKms getWQKmsUncached(int column, int wst_id) {
+
+        if (log.isDebugEnabled()) {
+            log.debug("WQKmsFactory.getWQKmsUncached, column "
+                + column + ", wst_id " + wst_id);
+        }
+
+        WQKms wqkms = new WQKms(WKmsFactory.getWKmsName(column, wst_id));
+
+        Session session = SessionHolder.HOLDER.get();
+        SQLQuery sqlQuery = session.createSQLQuery(SQL_SELECT_WQS)
+            .addScalar("position", StandardBasicTypes.DOUBLE)
+            .addScalar("w",  StandardBasicTypes.DOUBLE)
+            .addScalar("q",  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);
+            // add(w, q, km)
+            wqkms.add((Double) row[1], (Double) row[2], (Double) row[0]);
+        }
+
+        return wqkms;
+    }
+
+
+    /**
+     * Get WQKms from db.
+     * @param columnID the columns database id value
+     * @param wst_id database id of the wst
+     * @return respective WQKms.
+     */
+    public static int[] getColumn(int columnID) {
+
+        if (log.isDebugEnabled()) {
+            log.debug("WQKmsFactory.getColumn, columnID "
+                + columnID);
+        }
+
+        Session session = SessionHolder.HOLDER.get();
+
+        SQLQuery sqlQuery = session.createSQLQuery(SQL_SELECT_COLUMN)
+            .addScalar("wst_id",  StandardBasicTypes.INTEGER)
+            .addScalar("position", StandardBasicTypes.INTEGER);
+        sqlQuery.setInteger("column_id", columnID);
+
+        List<Object []> results = sqlQuery.list();
+
+        for (int i = 0, N = results.size(); i < N; i++) {
+            Object[] row = results.get(i);
+            return new int[] {(Integer)row[0], (Integer)row[1]};
+        }
+
+        return null;
+    }
+
+
+    /** Get name for a WKms. */
+    public static String getWQKmsName(int columnID) {
+        log.debug("WQKmsFactory.getWQKmsName c/" + columnID);
+
+        String name = null;
+        Session session = SessionHolder.HOLDER.get();
+
+        SQLQuery nameQuery = session.createSQLQuery(SQL_SELECT_NAME)
+            .addScalar("name", StandardBasicTypes.STRING);
+        nameQuery.setInteger("column_id", columnID);
+
+        List<String> names = nameQuery.list();
+        if (names.size() >= 1) {
+            name = names.get(0);
+        }
+
+        return name;
+    }
+}
+// vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :