Mercurial > dive4elements > river

annotate artifacts/src/main/java/org/dive4elements/river/artifacts/model/CrossSectionFactory.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.
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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 java.util.List;
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12
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13 import net.sf.ehcache.Cache;
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14 import net.sf.ehcache.Element;
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15
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16 import org.dive4elements.river.backend.SessionHolder;
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17 import org.dive4elements.river.model.CrossSection;
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18 import org.dive4elements.river.model.River;
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19
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20 import org.dive4elements.river.artifacts.cache.CacheFactory;
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21
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22 import org.hibernate.Session;
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23 import org.hibernate.Query;
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24
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25
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26 /**
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27 * Get Cross Sections.
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28 */
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29 public class CrossSectionFactory {
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30
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31 protected final static String CACHE_NAME = "cross_sections";
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32
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33 // TODO use caching consistently, streamline acces.
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34 /**
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35 * Get CrossSections for an instantiated River.
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36 *
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37 * @param river river object.
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38 *
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39 * @return List of Cross Sections of river.
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40 */
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41 public static List<CrossSection> getCrossSections(River river) {
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42 return getCrossSections(river.getName());
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43 }
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44
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45
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46 /**
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47 * Get Cross Sections for a river by name.
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48 *
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49 * @param riverName name of the river of interest.
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50 *
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51 * @return List of Cross Sections of river.
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52 */
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53 public static List<CrossSection> getCrossSections(String riverName) {
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54 Session session = SessionHolder.HOLDER.get();
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55 Query query = session.createQuery(
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56 "from CrossSection where river.name = :rivername");
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57 query.setParameter("rivername", riverName);
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58 return query.list();
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59 }
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60
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61
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62 /**
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63 * True if the given section is the "newest" for that river.
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64 * @param section Given section
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65 * @return true if the section has the most advanced end of its validity interval
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66 * or the most advanced start of its validity interval.
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67 */
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68 public static boolean isNewest(CrossSection section) {
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69 Session session = SessionHolder.HOLDER.get();
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70 Query query = session.createQuery(
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71 "from CrossSection where river.id = :riverid "
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72 + " order by timeInterval.stopTime desc, timeInterval.startTime desc");
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73 query.setParameter("riverid", section.getRiver().getId());
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74
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75 List result = query.list();
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76
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77 if (result == null || result.isEmpty()) {
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78 return true;
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79 }
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80 else {
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81 CrossSection cs = (CrossSection) result.get(0);
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82 return section.getId().equals(cs.getId());
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83 }
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84 }
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85
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86
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87 /**
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88 * Get a specific CrossSection from db.
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89 * @param id The dbid of the cross-section to load.
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90 */
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91 public static CrossSection getCrossSection(int id) {
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92 Cache cache = CacheFactory.getCache(CACHE_NAME);
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93 if (cache != null) {
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94 Element element = cache.get(Integer.valueOf(id));
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95 if (element != null) {
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96 return (CrossSection) element.getValue();
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97 }
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98 }
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99
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100 CrossSection section = getCrossSectionUncached(id);
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101 if (cache != null) {
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102 Element element = new Element(Integer.valueOf(id), section);
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103 cache.put(element);
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104 }
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105
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106 return section;
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107 }
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108
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109
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110 /** Get specific CrossSection from database. */
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111 protected static CrossSection getCrossSectionUncached(int id) {
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112 Session session = SessionHolder.HOLDER.get();
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113 Query query = session.createQuery(
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114 "from CrossSection where id=:id");
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115 query.setParameter("id", id);
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116 List<CrossSection> list = query.list();
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117 return list.isEmpty() ? null : list.get(0);
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118 }
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119 }
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120 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf-8 :
http://dive4elements.wald.intevation.org