Mercurial > dive4elements > river
comparison flys-artifacts/src/main/java/de/intevation/flys/artifacts/model/WQKmsFactory.java @ 1825:02cd002205a3
Added 'static' wqkms data access.
flys-artifacts/trunk@3154 c6561f87-3c4e-4783-a992-168aeb5c3f6f
| author | Felix Wolfsteller <felix.wolfsteller@intevation.de> |
|---|---|
| date | Thu, 03 Nov 2011 13:22:55 +0000 |
| parents | |
| children | 853cd2120d69 |
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| 1824:982956bde69e | 1825:02cd002205a3 |
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| 1 package de.intevation.flys.artifacts.model; | |
| 2 | |
| 3 import java.util.List; | |
| 4 | |
| 5 import net.sf.ehcache.Cache; | |
| 6 import net.sf.ehcache.Element; | |
| 7 | |
| 8 import org.apache.log4j.Logger; | |
| 9 | |
| 10 import org.hibernate.Session; | |
| 11 | |
| 12 import org.hibernate.SQLQuery; | |
| 13 import org.hibernate.type.StandardBasicTypes; | |
| 14 | |
| 15 import de.intevation.flys.artifacts.model.WQKms; | |
| 16 | |
| 17 import de.intevation.flys.artifacts.cache.CacheFactory; | |
| 18 | |
| 19 import de.intevation.flys.backend.SessionHolder; | |
| 20 | |
| 21 /** | |
| 22 * Factory to access ready-made WQKms for other (than computed) 'kinds' of | |
| 23 * WST-data. | |
| 24 */ | |
| 25 public class WQKmsFactory | |
| 26 { | |
| 27 private static Logger log = Logger.getLogger(WQKmsFactory.class); | |
| 28 | |
| 29 /** Query to get km and wqs for wst_id and column_pos. */ | |
| 30 public static final String SQL_SELECT_WQS = | |
| 31 "SELECT position, w, q FROM wst_value_table " + | |
| 32 "WHERE wst_id = :wst_id AND column_pos = :column_pos"; | |
| 33 | |
| 34 /** Query to get name for wst_id and column_pos. */ | |
| 35 public static final String SQL_SELECT_NAME = | |
| 36 "SELECT name " + | |
| 37 "FROM wst_columns "+ | |
| 38 "WHERE wst_id = :wst_id AND position = :column_pos"; | |
| 39 | |
| 40 | |
| 41 /** Hidden constructor, use static methods instead. */ | |
| 42 private WQKmsFactory() { | |
| 43 ; | |
| 44 } | |
| 45 | |
| 46 | |
| 47 /** | |
| 48 * Get WKms for given column and wst_id, caring about the cache. | |
| 49 */ | |
| 50 public static WQKms getWQKms(int column, int wst_id) { | |
| 51 log.debug("WQKmsFactory.getWQKms"); | |
| 52 Cache cache = CacheFactory.getCache(StaticWQKmsCacheKey.CACHE_NAME); | |
| 53 | |
| 54 StaticWQKmsCacheKey cacheKey; | |
| 55 | |
| 56 if (cache != null) { | |
| 57 cacheKey = new StaticWQKmsCacheKey(wst_id, column); | |
| 58 Element element = cache.get(cacheKey); | |
| 59 if (element != null) { | |
| 60 log.debug("Got static wst values from cache"); | |
| 61 return (WQKms)element.getValue(); | |
| 62 } | |
| 63 } | |
| 64 else { | |
| 65 cacheKey = null; | |
| 66 } | |
| 67 | |
| 68 WQKms values = getWQKmsUncached(column, wst_id); | |
| 69 | |
| 70 if (values != null && cacheKey != null) { | |
| 71 log.debug("Store static wst values in cache."); | |
| 72 Element element = new Element(cacheKey, values); | |
| 73 cache.put(element); | |
| 74 } | |
| 75 return values; | |
| 76 } | |
| 77 | |
| 78 | |
| 79 /** | |
| 80 * Get WQKms from db. | |
| 81 * @param column the position columns value | |
| 82 * @param wst_id database id of the wst | |
| 83 * @return respective WQKms. | |
| 84 */ | |
| 85 public static WQKms getWQKmsUncached(int column, int wst_id) { | |
| 86 | |
| 87 if (log.isDebugEnabled()) { | |
| 88 log.debug("WQKmsFactory.getWQKmsUncached, column " | |
| 89 + column + ", wst_id " + wst_id); | |
| 90 } | |
| 91 | |
| 92 WQKms wqkms = new WQKms(WKmsFactory.getWKmsName(column, wst_id)); | |
| 93 | |
| 94 Session session = SessionHolder.HOLDER.get(); | |
| 95 SQLQuery sqlQuery = session.createSQLQuery(SQL_SELECT_WQS) | |
| 96 .addScalar("position", StandardBasicTypes.DOUBLE) | |
| 97 .addScalar("w", StandardBasicTypes.DOUBLE) | |
| 98 .addScalar("q", StandardBasicTypes.DOUBLE); | |
| 99 sqlQuery.setInteger("wst_id", wst_id); | |
| 100 sqlQuery.setInteger("column_pos", column); | |
| 101 | |
| 102 List<Object []> results = sqlQuery.list(); | |
| 103 | |
| 104 double kms [] = new double[results.size()]; | |
| 105 double ws [] = new double[results.size()]; | |
| 106 double qs [] = new double[results.size()]; | |
| 107 | |
| 108 int lastColumn = Integer.MAX_VALUE; | |
| 109 | |
| 110 for (int i = 0, N = results.size(); i < N; i++) { | |
| 111 Object[] row = results.get(i); | |
| 112 // add(w, q, km) | |
| 113 wqkms.add((Double) row[1], (Double) row[2], (Double) row[0]); | |
| 114 } | |
| 115 | |
| 116 return wqkms; | |
| 117 } | |
| 118 } | |
| 119 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |