Mercurial > dive4elements > river
view flys-artifacts/src/main/java/de/intevation/flys/artifacts/model/WQKmsFactory.java @ 1839:c3b44da22a3a
Minor refactoring in preparation of generation of interpolators (WstValueTable) for static WQKms.
flys-artifacts/trunk@3175 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Felix Wolfsteller <felix.wolfsteller@intevation.de> |
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date | Mon, 07 Nov 2011 12:37:41 +0000 |
parents | 853cd2120d69 |
children | 6f047a407f84 |
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package de.intevation.flys.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 de.intevation.flys.artifacts.model.WQKms; import de.intevation.flys.artifacts.cache.CacheFactory; import de.intevation.flys.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"; /** 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"; /** Hidden constructor, use static methods instead. */ private WQKmsFactory() { ; } /** * Get WKms for given column and wst_id, caring about the cache. */ public static WQKms getWQKms(int column, int wst_id) { log.debug("WQKmsFactory.getWQKms"); Cache cache = CacheFactory.getCache(StaticWQKmsCacheKey.CACHE_NAME); StaticWQKmsCacheKey cacheKey; if (cache != null) { cacheKey = new StaticWQKmsCacheKey(wst_id, column); 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(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 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(); int lastColumn = Integer.MAX_VALUE; 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; } } // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :