Mercurial > dive4elements > river

annotate artifacts/src/main/java/org/dive4elements/river/artifacts/model/LocationProvider.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 net.sf.ehcache.Cache;
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12 import net.sf.ehcache.Element;
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13
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14 import org.apache.log4j.Logger;
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15
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16 import org.dive4elements.river.model.Annotation;
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17 import org.dive4elements.river.model.FastAnnotations;
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18
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19 import org.dive4elements.river.artifacts.cache.CacheFactory;
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20
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21
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22 /** Make FastAnnotations (db unbound) available. */
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23 public class LocationProvider {
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24
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25 private static final Logger log =
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26 Logger.getLogger(LocationProvider.class);
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27
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28
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29 public static final String CACHE_KEY = "location-provider";
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31 public static final String PREFIX = "lp-";
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32
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33
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34 private LocationProvider() {
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35 }
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36
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37 public static String getLocation(String river, double km) {
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38
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39 FastAnnotations fas = getAnnotations(river, km);
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40
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41 FastAnnotations.Annotation an = fas.findByKm(km);
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42
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43 return an != null ? an.getPosition() : null;
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44 }
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45
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46 public static FastAnnotations getAnnotations(String river) {
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47 return getAnnotations(river, Double.MAX_VALUE);
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48 }
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49
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50 protected static FastAnnotations getAnnotations(String river, double km) {
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51 // TODO issue880: Make annotations available _per type_
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52
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53 Cache cache = CacheFactory.getCache(CACHE_KEY);
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54
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55 if (cache == null) {
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56 return uncachedAnnotations(river, km);
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57 }
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58
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59 String key = PREFIX + river;
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60
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61 Element element = cache.get(key);
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62
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63 if (element != null) {
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64 return (FastAnnotations)element.getValue();
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65 }
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66
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67 FastAnnotations fas = uncachedAnnotations(river, Double.MAX_VALUE);
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68
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69 cache.put(new Element(key, fas));
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70
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71 return fas;
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72 }
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73
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74 protected static FastAnnotations uncachedAnnotations(
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75 String river,
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76 double km
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77 ) {
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78 if (km != Double.MAX_VALUE) {
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79 // XXX Fake it by using a standard Annotation.
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80
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81 Annotation annotation =
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82 AnnotationsFactory.getAnnotation(river, km);
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83
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84 if (annotation != null) {
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85 FastAnnotations.Annotation fa =
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86 new FastAnnotations.Annotation(
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87 km, Double.NaN,
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88 annotation.getPosition().getValue(), null, null,
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89 Double.NaN, Double.NaN);
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90 return new FastAnnotations(
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91 new FastAnnotations.Annotation [] { fa });
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92 }
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93
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94 return new FastAnnotations(new FastAnnotations.Annotation[0]);
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95 }
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96
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97 long startTime = System.currentTimeMillis();
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98
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99 FastAnnotations fas = new FastAnnotations(river);
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100
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101 long stopTime = System.currentTimeMillis();
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102
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103 if (log.isDebugEnabled()) {
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104 log.debug("Loading locations took " +
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105 (stopTime-startTime)/1000f + " secs.");
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106 }
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107
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108 return fas;
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109 }
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110 }
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111 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org