Mercurial > dive4elements > river
view flys-artifacts/src/main/java/de/intevation/flys/artifacts/model/WKmsFactory.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 | ae6ace900c07 |
children | eef657302834 |
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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.WKms; import de.intevation.flys.artifacts.model.WKmsImpl; import de.intevation.flys.artifacts.cache.CacheFactory; import de.intevation.flys.backend.SessionHolder; /** * Factory to access ready-made WKms for other (than computed) 'kinds' of * WST-data. */ public class WKmsFactory { 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"; 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 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(); double kms [] = new double[results.size()]; double ws [] = new double[results.size()]; int lastColumn = Integer.MAX_VALUE; 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 :