Mercurial > dive4elements > river

annotate artifacts/src/main/java/org/dive4elements/river/artifacts/model/CrossSectionFactory.java @ 5838:5aa05a7a34b7

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Rename modules to more fitting names.
author Sascha L. Teichmann <teichmann@intevation.de>
date Thu, 25 Apr 2013 15:23:37 +0200
parents flys-artifacts/src/main/java/org/dive4elements/river/artifacts/model/CrossSectionFactory.java@bd047b71ab37
children 4897a58c8746
rev   line source
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1 package org.dive4elements.river.artifacts.model;
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2
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3 import java.util.List;
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4
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5 import net.sf.ehcache.Cache;
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6 import net.sf.ehcache.Element;
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7
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8 import org.dive4elements.river.backend.SessionHolder;
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9 import org.dive4elements.river.model.CrossSection;
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10 import org.dive4elements.river.model.River;
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11
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12 import org.dive4elements.river.artifacts.cache.CacheFactory;
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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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17
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18 /**
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19 * Get Cross Sections.
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20 */
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21 public class CrossSectionFactory {
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22
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23 protected final static String CACHE_NAME = "cross_sections";
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25 // TODO use caching consistently, streamline acces.
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26 /**
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27 * Get CrossSections for an instantiated River.
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28 *
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29 * @param river river object.
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30 *
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31 * @return List of Cross Sections of river.
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32 */
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33 public static List<CrossSection> getCrossSections(River river) {
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34 return getCrossSections(river.getName());
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35 }
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36
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37
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38 /**
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39 * Get Cross Sections for a river by name.
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40 *
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41 * @param riverName name of the river of interest.
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42 *
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43 * @return List of Cross Sections of river.
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44 */
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45 public static List<CrossSection> getCrossSections(String riverName) {
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46 Session session = SessionHolder.HOLDER.get();
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47 Query query = session.createQuery(
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48 "from CrossSection where river.name = :rivername");
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49 query.setParameter("rivername", riverName);
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50 return query.list();
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51 }
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52
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53
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54 /**
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55 * True if the given section is the "newest" for that river.
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56 * @param section Given section
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57 * @return true if the section has the most advanced end of its validity interval
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58 * or the most advanced start of its validity interval.
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59 */
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60 public static boolean isNewest(CrossSection section) {
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61 Session session = SessionHolder.HOLDER.get();
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62 Query query = session.createQuery(
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63 "from CrossSection where river.id = :riverid "
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64 + " order by timeInterval.stopTime desc, timeInterval.startTime desc");
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65 query.setParameter("riverid", section.getRiver().getId());
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66
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67 List result = query.list();
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68
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69 if (result == null || result.isEmpty()) {
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70 return true;
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71 }
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72 else {
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73 CrossSection cs = (CrossSection) result.get(0);
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74 return section.getId().equals(cs.getId());
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75 }
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76 }
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77
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78
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79 /**
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80 * Get a specific CrossSection from db.
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81 * @param id The dbid of the cross-section to load.
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82 */
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83 public static CrossSection getCrossSection(int id) {
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84 Cache cache = CacheFactory.getCache(CACHE_NAME);
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85 if (cache != null) {
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86 Element element = cache.get(Integer.valueOf(id));
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87 if (element != null) {
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88 return (CrossSection) element.getValue();
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89 }
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90 }
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91
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92 CrossSection section = getCrossSectionUncached(id);
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93 if (cache != null) {
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94 Element element = new Element(Integer.valueOf(id), section);
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95 cache.put(element);
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96 }
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97
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98 return section;
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99 }
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100
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101
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102 /** Get specific CrossSection from database. */
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103 protected static CrossSection getCrossSectionUncached(int id) {
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104 Session session = SessionHolder.HOLDER.get();
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105 Query query = session.createQuery(
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106 "from CrossSection where id=:id");
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107 query.setParameter("id", id);
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108 List<CrossSection> list = query.list();
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109 return list.isEmpty() ? null : list.get(0);
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110 }
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111 }
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112 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf-8 :
http://dive4elements.wald.intevation.org