Mercurial > dive4elements > river
view artifacts/src/main/java/org/dive4elements/river/artifacts/model/WQKmsFactory.java @ 6767:6a67a8f01f5b
QualityMeasurementFactory: Doc about singleton usage.
Also force it by making constructor private.
author | Felix Wolfsteller <felix.wolfsteller@intevation.de> |
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date | Wed, 07 Aug 2013 11:00:55 +0200 |
parents | bcea24d8c2ec |
children | 5e38e2924c07 |
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/* Copyright (C) 2011, 2012, 2013 by Bundesanstalt für Gewässerkunde * Software engineering by Intevation GmbH * * This file is Free Software under the GNU AGPL (>=v3) * and comes with ABSOLUTELY NO WARRANTY! Check out the * documentation coming with Dive4Elements River for details. */ 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) if (row == null || row[0] == null || row[1] == null || row[2] == null) { log.warn("A value in result for WQKms is null."); continue; } 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 :