Mercurial > dive4elements > river
diff flys-artifacts/src/main/java/de/intevation/flys/artifacts/model/WQKmsFactory.java @ 3786:4adc35aa655c
merged flys-artifacts/2.9.1
author | Thomas Arendsen Hein <thomas@intevation.de> |
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date | Fri, 28 Sep 2012 12:14:47 +0200 |
parents | 0f7abd95c6e2 |
children | 58bdf95df5e4 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/flys-artifacts/src/main/java/de/intevation/flys/artifacts/model/WQKmsFactory.java Fri Sep 28 12:14:47 2012 +0200 @@ -0,0 +1,112 @@ +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.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 :