Mercurial > dive4elements > river

annotate artifacts/src/main/java/org/dive4elements/river/artifacts/model/GaugeFinderFactory.java @ 5863:4897a58c8746

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River artifacts: Added new copyright headers.
author Sascha L. Teichmann <teichmann@intevation.de>
date Sun, 28 Apr 2013 14:40:59 +0200
parents 5aa05a7a34b7
children af13ceeba52a
rev   line source
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4897a58c8746 River artifacts: Added new copyright headers.
Sascha L. Teichmann <teichmann@intevation.de>
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1 /* Copyright (C) 2011, 2012, 2013 by Bundesanstalt für Gewässerkunde
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2 * Software engineering by Intevation GmbH
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3 *
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4 * This file is Free Software under the GNU AGPL (>=v3)
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5 * and comes with ABSOLUTELY NO WARRANTY! Check out the
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6 * documentation coming with Dive4Elements River for details.
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7 */
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8
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9 package org.dive4elements.river.artifacts.model;
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10
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11 import org.dive4elements.river.artifacts.cache.CacheFactory;
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12
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13 import org.dive4elements.river.backend.SessionHolder;
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14
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15 import org.dive4elements.river.model.River;
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16
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17 import java.util.ArrayList;
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18 import java.util.List;
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19
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20 import net.sf.ehcache.Cache;
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21 import net.sf.ehcache.Element;
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22
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23 import org.apache.log4j.Logger;
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24
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25 import org.hibernate.SQLQuery;
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26 import org.hibernate.Session;
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27
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28 import org.hibernate.type.StandardBasicTypes;
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29
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30 /** Get GaugeFinders. */
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31 public class GaugeFinderFactory
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32 {
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33 private static Logger log = Logger.getLogger(GaugeFinderFactory.class);
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34
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35 public static final String CACHE_NAME = "gauge-finders";
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36
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37 public static final String SQL_GAUGES =
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38 "SELECT" +
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39 " g.id AS gauge_id," +
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40 " g.name AS name," +
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41 " r.a AS a," +
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42 " r.b AS b " +
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43 "FROM gauges g" +
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44 " JOIN ranges r ON g.range_id = r.id " +
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45 "WHERE" +
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46 " g.river_id = :river_id " +
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47 "ORDER BY r.a";
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48
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49 private static GaugeFinderFactory INSTANCE;
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50
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51 protected GaugeFinderFactory() {
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52 }
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53
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54 public static synchronized GaugeFinderFactory getInstance() {
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55 if (INSTANCE == null) {
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56 INSTANCE = new GaugeFinderFactory();
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57 }
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58
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59 return INSTANCE;
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60 }
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61
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62 public GaugeFinder getGaugeFinder(String riverName) {
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63 River river = RiverFactory.getRiver(riverName);
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64 return river != null
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65 ? getGaugeFinder(river.getId(), river.getKmUp())
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66 : null;
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67 }
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68
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69 public synchronized GaugeFinder getGaugeFinder(
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70 int riverId,
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71 boolean isKmUp
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72 ) {
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73 Cache cache = CacheFactory.getCache(CACHE_NAME);
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74
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75 if (cache == null) {
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76 return getUncached(riverId, isKmUp);
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77 }
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78
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79 String cacheKey = riverId + "-" + isKmUp;
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80 Element element = cache.get(cacheKey);
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81
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82 if (element != null) {
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83 return (GaugeFinder)element.getValue();
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84 }
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85
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86 GaugeFinder finder = getUncached(riverId, isKmUp);
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87
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88 if (finder != null) {
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89 cache.put(new Element(cacheKey, finder));
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90 }
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91
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92 return finder;
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93 }
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94
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95 protected GaugeFinder loadGauges(
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96 Session session,
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97 int riverId,
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98 boolean isKmUp
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99 ) {
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100 SQLQuery query = session.createSQLQuery(SQL_GAUGES)
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101 .addScalar("gauge_id", StandardBasicTypes.INTEGER)
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102 .addScalar("name", StandardBasicTypes.STRING)
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103 .addScalar("a", StandardBasicTypes.DOUBLE)
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104 .addScalar("b", StandardBasicTypes.DOUBLE);
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105
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106 query.setInteger("river_id", riverId);
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107
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108 List<Object []> list = query.list();
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109
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110 if (list.isEmpty()) {
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111 log.warn("River " + riverId + " has no gauges.");
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112 return null;
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113 }
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114
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115 List<GaugeRange> gauges = new ArrayList<GaugeRange>();
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116
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117 for (Object [] row: list) {
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118 int gaugeId = (Integer)row[0];
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119 String name = (String) row[1];
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120 double start = (Double) row[2];
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121 double end = (Double) row[3];
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122 GaugeRange gauge = new GaugeRange(start, end, name, gaugeId);
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123 gauges.add(gauge);
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124 }
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125
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126 return new GaugeFinder(gauges, isKmUp);
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127 }
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128
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129 protected GaugeFinder getUncached(int riverId, boolean isKmUp) {
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130 Session session = SessionHolder.HOLDER.get();
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131
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132 GaugeFinder finder = loadGauges(session, riverId, isKmUp);
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133
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134 if (finder == null
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135 || !finder.loadDischargeSectors(session, riverId)) {
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136 return null;
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137 }
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138
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139 return finder;
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140 }
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141 }
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142 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org