Mercurial > dive4elements > river
comparison flys-artifacts/src/main/java/de/intevation/flys/artifacts/model/LocationProvider.java @ 3814:8083f6384023
merged flys-artifacts/pre2.6-2012-01-04
| author | Thomas Arendsen Hein <thomas@intevation.de> |
|---|---|
| date | Fri, 28 Sep 2012 12:14:56 +0200 |
| parents | 97a25b54eea3 |
| children | 0c7847b8e85e |
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| 1491:2a00f4849738 | 3814:8083f6384023 |
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| 1 package de.intevation.flys.artifacts.model; | |
| 2 | |
| 3 import net.sf.ehcache.Cache; | |
| 4 import net.sf.ehcache.Element; | |
| 5 | |
| 6 import org.apache.log4j.Logger; | |
| 7 | |
| 8 import de.intevation.flys.model.Annotation; | |
| 9 import de.intevation.flys.model.Position; | |
| 10 | |
| 11 import de.intevation.flys.artifacts.cache.CacheFactory; | |
| 12 import de.intevation.flys.artifacts.model.AnnotationsFactory; | |
| 13 | |
| 14 | |
| 15 public class LocationProvider { | |
| 16 | |
| 17 public static final String CACHE_KEY = "location-provider"; | |
| 18 | |
| 19 | |
| 20 private static final Logger logger = | |
| 21 Logger.getLogger(LocationProvider.class); | |
| 22 | |
| 23 | |
| 24 private LocationProvider() { | |
| 25 } | |
| 26 | |
| 27 | |
| 28 public static String getLocation(String river, double km) { | |
| 29 return getLocation(getLocationHash(river, km), river, km); | |
| 30 } | |
| 31 | |
| 32 | |
| 33 public static String getLocation(String hash, String river, double km) { | |
| 34 logger.debug("Fetch location for '" + river + "' at '" + km + "'"); | |
| 35 | |
| 36 Cache cache = CacheFactory.getCache(CACHE_KEY); | |
| 37 | |
| 38 if (cache != null) { | |
| 39 return getCachedLocation(cache, hash, river, km); | |
| 40 } | |
| 41 else { | |
| 42 logger.info("No Cache for Locations configured."); | |
| 43 return getUncachedLocation(river, km); | |
| 44 } | |
| 45 } | |
| 46 | |
| 47 | |
| 48 protected static String getCachedLocation( | |
| 49 Cache cache, | |
| 50 String hash, | |
| 51 String river, | |
| 52 double km | |
| 53 ) { | |
| 54 logger.debug("Fetch location from cache."); | |
| 55 | |
| 56 Element element = cache.get(hash); | |
| 57 | |
| 58 if (element == null) { | |
| 59 logger.debug("Element is not in cache yet."); | |
| 60 | |
| 61 String location = getUncachedLocation(river, km); | |
| 62 element = new Element(hash, location); | |
| 63 cache.put(element); | |
| 64 } | |
| 65 | |
| 66 return (String) element.getValue(); | |
| 67 } | |
| 68 | |
| 69 | |
| 70 protected static String getUncachedLocation(String river, double km) { | |
| 71 logger.debug("Fetch location from backend."); | |
| 72 | |
| 73 Annotation annotation = AnnotationsFactory.getAnnotation(river, km); | |
| 74 | |
| 75 if (annotation != null) { | |
| 76 logger.debug("Found an annotation."); | |
| 77 Position pos = annotation.getPosition(); | |
| 78 return pos.getValue(); | |
| 79 } | |
| 80 | |
| 81 return ""; | |
| 82 } | |
| 83 | |
| 84 | |
| 85 protected static String getLocationHash(String river, double km) { | |
| 86 return river + "#" + km; | |
| 87 } | |
| 88 } | |
| 89 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |