Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/model/LocationProvider.java @ 3185:f1e4b37dcb60

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Enable legend item aggreation in time series charts. flys-artifacts/trunk@4800 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Felix Wolfsteller <felix.wolfsteller@intevation.de>
date Tue, 26 Jun 2012 13:07:18 +0000
parents fe3ea0f16098
children 0f7abd95c6e2
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 net.sf.ehcache.Cache;
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4 import net.sf.ehcache.Element;
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5
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6 import org.apache.log4j.Logger;
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7
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8 import de.intevation.flys.model.Annotation;
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9 import de.intevation.flys.model.FastAnnotations;
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10
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11 import de.intevation.flys.artifacts.cache.CacheFactory;
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12
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13 import de.intevation.flys.artifacts.model.AnnotationsFactory;
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14
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15 public class LocationProvider {
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17 private static final Logger log =
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18 Logger.getLogger(LocationProvider.class);
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20
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21 public static final String CACHE_KEY = "location-provider";
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23 public static final String PREFIX = "lp-";
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24
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26 private LocationProvider() {
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27 }
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28
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29 public static String getLocation(String river, double km) {
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31 FastAnnotations fas = getAnnotations(river, km);
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32
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33 FastAnnotations.Annotation an = fas.findByKm(km);
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34
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35 return an != null ? an.getPosition() : null;
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36 }
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37
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38 public static FastAnnotations getAnnotations(String river) {
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39 return getAnnotations(river, Double.MAX_VALUE);
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40 }
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41
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42 protected static FastAnnotations getAnnotations(String river, double km) {
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44 Cache cache = CacheFactory.getCache(CACHE_KEY);
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46 if (cache == null) {
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47 return uncachedAnnotations(river, km);
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48 }
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49
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50 String key = PREFIX + river;
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51
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52 Element element = cache.get(key);
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53
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54 if (element != null) {
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55 return (FastAnnotations)element.getValue();
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56 }
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57
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58 FastAnnotations fas = uncachedAnnotations(river, Double.MAX_VALUE);
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59
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60 cache.put(new Element(key, fas));
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61
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62 return fas;
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63 }
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64
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65 protected static FastAnnotations uncachedAnnotations(
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66 String river,
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67 double km
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68 ) {
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69 if (km != Double.MAX_VALUE) {
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70 // XXX Fake it by using a standard Annotation.
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71
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72 Annotation annotation =
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73 AnnotationsFactory.getAnnotation(river, km);
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74
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75 if (annotation != null) {
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76 FastAnnotations.Annotation fa =
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77 new FastAnnotations.Annotation(
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78 km, Double.NaN,
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79 annotation.getPosition().getValue(), null, null,
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80 Double.NaN, Double.NaN);
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81 return new FastAnnotations(
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82 new FastAnnotations.Annotation [] { fa });
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83 }
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84
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85 return new FastAnnotations(new FastAnnotations.Annotation[0]);
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86 }
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87
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88 long startTime = System.currentTimeMillis();
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89
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90 FastAnnotations fas = new FastAnnotations(river);
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91
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92 long stopTime = System.currentTimeMillis();
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93
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94 if (log.isDebugEnabled()) {
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95 log.debug("Loading locations took " +
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96 (stopTime-startTime)/1000f + " secs.");
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97 }
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98
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99 return fas;
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100 }
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101 }
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102 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org