view flys-artifacts/src/main/java/de/intevation/flys/artifacts/model/LocationProvider.java @ 4655:cd44d28d0fbc

Move the access to artifact data to the Access object Use BedHeightAccess class to receive the data from the artifact. This abstracts the data access from the actual artifact.
author Björn Ricks <bjoern.ricks@intevation.de>
date Tue, 11 Dec 2012 09:44:04 +0100
parents efb067ab2ca4
children
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package de.intevation.flys.artifacts.model;

import net.sf.ehcache.Cache;
import net.sf.ehcache.Element;

import org.apache.log4j.Logger;

import de.intevation.flys.model.Annotation;
import de.intevation.flys.model.FastAnnotations;

import de.intevation.flys.artifacts.cache.CacheFactory;


/** Make FastAnnotations (db unbound) available. */
public class LocationProvider {

    private static final Logger log =
        Logger.getLogger(LocationProvider.class);


    public static final String CACHE_KEY = "location-provider";

    public static final String PREFIX = "lp-";


    private LocationProvider() {
    }

    public static String getLocation(String river, double km) {

        FastAnnotations fas = getAnnotations(river, km);

        FastAnnotations.Annotation an = fas.findByKm(km);

        return an != null ? an.getPosition() : null;
    }

    public static FastAnnotations getAnnotations(String river) {
        return getAnnotations(river, Double.MAX_VALUE);
    }

    protected static FastAnnotations getAnnotations(String river, double km) {
        // TODO issue880: Make annotations available _per type_

        Cache cache = CacheFactory.getCache(CACHE_KEY);

        if (cache == null) {
            return uncachedAnnotations(river, km);
        }

        String key = PREFIX + river;

        Element element = cache.get(key);

        if (element != null) {
            return (FastAnnotations)element.getValue();
        }

        FastAnnotations fas = uncachedAnnotations(river, Double.MAX_VALUE);

        cache.put(new Element(key, fas));

        return fas;
    }

    protected static FastAnnotations uncachedAnnotations(
        String river,
        double km
    ) {
        if (km != Double.MAX_VALUE) {
            // XXX Fake it by using a standard Annotation.

            Annotation annotation =
                AnnotationsFactory.getAnnotation(river, km);

            if (annotation != null) {
                FastAnnotations.Annotation fa =
                    new FastAnnotations.Annotation(
                        km, Double.NaN,
                        annotation.getPosition().getValue(), null, null,
                        Double.NaN, Double.NaN);
                return new FastAnnotations(
                    new FastAnnotations.Annotation [] { fa });
            }

            return new FastAnnotations(new FastAnnotations.Annotation[0]);
        }

        long startTime = System.currentTimeMillis();

        FastAnnotations fas = new FastAnnotations(river);

        long stopTime = System.currentTimeMillis();

        if (log.isDebugEnabled()) {
            log.debug("Loading locations took " +
                (stopTime-startTime)/1000f + " secs.");
        }

        return fas;
    }
}
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