Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/model/AnnotationsFactory.java @ 1924:57b03b3ab15c

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Optimize query to fix annotations fetching on oracle, by Sascha Teichmann. flys-artifacts/trunk@3300 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Felix Wolfsteller <felix.wolfsteller@intevation.de>
date Tue, 22 Nov 2011 13:39:23 +0000
parents bcef54a563ea
children 01f2473e362d
rev   line source
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1a00cb4998a8 Implemented a service that retrieves distance information for a specific river.
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1 package de.intevation.flys.artifacts.model;
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2
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3 import java.math.BigDecimal;
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4
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5 import java.util.List;
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6 import java.util.Iterator;
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7 import java.util.Collections;
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8
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9 import de.intevation.flys.backend.SessionHolder;
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10 import de.intevation.flys.model.Annotation;
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11 import de.intevation.flys.model.Range;
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12 import de.intevation.flys.model.River;
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13
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14 import org.hibernate.Session;
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15 import org.hibernate.Query;
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16
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17 /**
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18 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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19 */
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20 public class AnnotationsFactory {
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21
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22 /**
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23 * Get Annotations which do not have a "b" ("to")-value set.
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24 *
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25 * @param river name of the river of interest.
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26 *
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27 * @return List of Annotations for river which have only "a" ("from")
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28 * value set.
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29 */
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30 public static List<Annotation> getPointAnnotations(String river) {
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31 Session session = SessionHolder.HOLDER.get();
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32
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33 Query rangesQuery = session.createQuery(
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34 "from Range where river.name=:name and b = null");
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35 rangesQuery.setParameter("name", river);
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36 List<Range> ranges = rangesQuery.list();
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37
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38 Query query = session.createQuery(
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39 "from Annotation where range in (:ranges) order by range.a");
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40 query.setParameterList("ranges", ranges);
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41 return query.list();
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42 }
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43
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44
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45 public static List<Annotation> getAnnotations(River river) {
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46 Session session = SessionHolder.HOLDER.get();
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47
311
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48 Query query = session.createQuery(
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49 "from Annotation as an where an.range.river = :river" +
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50 " order by an.range.a");
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51 query.setParameter("river", river);
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52 return query.list();
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53 }
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54
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55 /**
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56 * Get minimal "a" ("from") and maximal "b" ("to") value of annotations'
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57 * ranges of a river.
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58 *
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59 * @param river name of the river of interest.
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60 *
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61 * @return Array containing minimal "a" and max "b" value of any
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62 * annotation stored for the given river.
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63 */
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64 public static double[] getAnnotationsBreadth(String river) {
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65 Session session = SessionHolder.HOLDER.get();
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66
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67 Query minAQuery = session.createQuery(
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68 "select min(a), max(b) from Range where river.name=:name");
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69 minAQuery.setParameter("name", river);
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70
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71 double[] minAmaxB = {0.0f, 0.0f};
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72 Object[] row = (Object[]) minAQuery.list().iterator().next();
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73 minAmaxB[0] = ((BigDecimal) row[0]).doubleValue();
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74 minAmaxB[1] = ((BigDecimal) row[1]).doubleValue();
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75 return minAmaxB;
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76 }
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77
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78
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79 public static Iterator<Annotation> getAnnotationsIterator(
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80 String riverName
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81 ) {
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82 Session session = SessionHolder.HOLDER.get();
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83
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84 Query riverQuery = session.createQuery(
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85 "from River where name = :name");
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86 riverQuery.setParameter("name", riverName);
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87 List<River> rivers = riverQuery.list();
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88 if (rivers.isEmpty()) {
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89 List<Annotation> list = Collections.emptyList();
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90 return list.iterator();
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91 }
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92
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93 Query query = session.createQuery(
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94 "from Annotation as an" +
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95 " where an.range.river = :river order by an.range.a");
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96 query.setParameter("river", rivers.get(0));
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97
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98 return (Iterator<Annotation>)query.iterate();
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99 }
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100 }
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101 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf-8 :
http://dive4elements.wald.intevation.org