Mercurial > dive4elements > river
annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/model/GaugeFinderFactory.java @ 4255:670e98f5a441
Fixed leak while merging facets.
The ThemeList that is used by OutputHelper to sort the
Facets for an Output now uses a list to store the ManagedFacets.
The correct order is made up by sorting the List using
Collections.sort() function of the Java JDK. Therfore, the
ManagedFacet class implements the Comparable interface. The
return value of its compareTo(other) method depends on the
value of the 'position' field.
author | Ingo Weinzierl <weinzierl.ingo@googlemail.com> |
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date | Thu, 25 Oct 2012 14:01:46 +0200 |
parents | c44ff50f4970 |
children | 61f4d4164a30 |
rev | line source |
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1 package de.intevation.flys.artifacts.model; |
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2 |
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3 import de.intevation.flys.artifacts.cache.CacheFactory; |
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4 |
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5 import de.intevation.flys.backend.SessionHolder; |
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6 |
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7 import de.intevation.flys.model.River; |
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8 |
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9 import java.util.ArrayList; |
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10 import java.util.List; |
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11 |
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12 import net.sf.ehcache.Cache; |
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13 import net.sf.ehcache.Element; |
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14 |
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15 import org.apache.log4j.Logger; |
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16 |
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17 import org.hibernate.SQLQuery; |
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18 import org.hibernate.Session; |
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19 |
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20 import org.hibernate.type.StandardBasicTypes; |
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21 |
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22 public class GaugeFinderFactory |
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23 { |
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24 private static Logger log = Logger.getLogger(GaugeFinderFactory.class); |
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25 |
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26 public static final String CACHE_NAME = "gauge-finders"; |
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27 |
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28 public static final String SQL_GAUGES = |
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29 "SELECT" + |
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30 " g.id AS gauge_id," + |
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31 " g.name AS name," + |
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32 " r.a AS a," + |
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33 " r.b AS b " + |
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34 "FROM gauges g" + |
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35 " JOIN ranges r ON g.range_id = r.id " + |
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36 "WHERE" + |
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37 " g.river_id = :river_id " + |
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38 "ORDER BY r.a"; |
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39 |
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40 private static GaugeFinderFactory INSTANCE; |
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41 |
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42 protected GaugeFinderFactory() { |
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43 } |
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44 |
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45 public static synchronized GaugeFinderFactory getInstance() { |
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46 if (INSTANCE == null) { |
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47 INSTANCE = new GaugeFinderFactory(); |
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48 } |
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49 |
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50 return INSTANCE; |
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51 } |
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52 |
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53 public GaugeFinder getGaugeFinder(String riverName) { |
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54 River river = RiverFactory.getRiver(riverName); |
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55 return river != null |
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56 ? getGaugeFinder(river.getId(), river.getKmUp()) |
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57 : null; |
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58 } |
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59 |
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60 public synchronized GaugeFinder getGaugeFinder( |
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61 int riverId, |
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62 boolean isKmUp |
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63 ) { |
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64 Cache cache = CacheFactory.getCache(CACHE_NAME); |
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65 |
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66 if (cache == null) { |
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67 return getUncached(riverId, isKmUp); |
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68 } |
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69 |
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70 String cacheKey = riverId + "-" + isKmUp; |
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71 Element element = cache.get(cacheKey); |
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72 |
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73 if (element != null) { |
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74 return (GaugeFinder)element.getValue(); |
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75 } |
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76 |
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77 GaugeFinder finder = getUncached(riverId, isKmUp); |
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78 |
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79 if (finder != null) { |
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80 cache.put(new Element(cacheKey, finder)); |
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81 } |
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82 |
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83 return finder; |
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84 } |
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85 |
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86 protected GaugeFinder loadGauges( |
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87 Session session, |
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88 int riverId, |
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89 boolean isKmUp |
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90 ) { |
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91 SQLQuery query = session.createSQLQuery(SQL_GAUGES) |
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92 .addScalar("gauge_id", StandardBasicTypes.INTEGER) |
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93 .addScalar("name", StandardBasicTypes.STRING) |
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94 .addScalar("a", StandardBasicTypes.DOUBLE) |
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95 .addScalar("b", StandardBasicTypes.DOUBLE); |
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96 |
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97 query.setInteger("river_id", riverId); |
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98 |
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99 List<Object []> list = query.list(); |
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100 |
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101 if (list.isEmpty()) { |
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102 log.warn("River " + riverId + " has no gauges."); |
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103 return null; |
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104 } |
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105 |
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106 List<GaugeRange> gauges = new ArrayList<GaugeRange>(); |
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107 |
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108 for (Object [] row: list) { |
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109 int gaugeId = (Integer)row[0]; |
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110 String name = (String) row[1]; |
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111 double start = (Double) row[2]; |
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112 double end = (Double) row[3]; |
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113 GaugeRange gauge = new GaugeRange(start, end, name, gaugeId); |
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114 gauges.add(gauge); |
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115 } |
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116 |
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117 return new GaugeFinder(gauges, isKmUp); |
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118 } |
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119 |
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120 protected GaugeFinder getUncached(int riverId, boolean isKmUp) { |
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121 Session session = SessionHolder.HOLDER.get(); |
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122 |
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123 GaugeFinder finder = loadGauges(session, riverId, isKmUp); |
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124 |
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125 if (finder == null |
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126 || !finder.loadDischargeSectors(session, riverId)) { |
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127 return null; |
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128 } |
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129 |
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130 return finder; |
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131 } |
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132 } |
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133 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |