Mercurial > dive4elements > river
comparison artifacts/src/main/java/org/dive4elements/river/utils/GaugeIndex.java @ 8850:6823991e1ed1
Better helper for acessing gauges by station
| author | gernotbelger |
|---|---|
| date | Thu, 18 Jan 2018 18:22:25 +0100 |
| parents | |
| children | 385b52ccde23 |
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| 8849:e4aadc953665 | 8850:6823991e1ed1 |
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| 1 /** Copyright (C) 2017 by Bundesanstalt für Gewässerkunde | |
| 2 * Software engineering by | |
| 3 * Björnsen Beratende Ingenieure GmbH | |
| 4 * Dr. Schumacher Ingenieurbüro für Wasser und Umwelt | |
| 5 * | |
| 6 * This file is Free Software under the GNU AGPL (>=v3) | |
| 7 * and comes with ABSOLUTELY NO WARRANTY! Check out the | |
| 8 * documentation coming with Dive4Elements River for details. | |
| 9 */ | |
| 10 package org.dive4elements.river.utils; | |
| 11 | |
| 12 import java.util.List; | |
| 13 | |
| 14 import org.dive4elements.river.model.Gauge; | |
| 15 | |
| 16 /** | |
| 17 * Allows performant access to gauges by station. | |
| 18 * @author Gernot Belger | |
| 19 */ | |
| 20 public class GaugeIndex { | |
| 21 private List<Gauge> gauges; | |
| 22 | |
| 23 private Gauge lastGauge = null; | |
| 24 | |
| 25 public GaugeIndex( List<Gauge> gauges) { | |
| 26 this.gauges = gauges; | |
| 27 } | |
| 28 | |
| 29 public Gauge findGauge(double km) { | |
| 30 | |
| 31 // REMARK: this is code copied from WaterlevelExporter, which is honestly not very fast/good. | |
| 32 // Instead we need to index by range with an RTree and directly acccess the right gauge. | |
| 33 | |
| 34 if( lastGauge != null && lastGauge.getRange().contains(km) ) | |
| 35 return lastGauge; | |
| 36 | |
| 37 final Gauge gauge = findGauge(km, gauges); | |
| 38 | |
| 39 lastGauge = gauge; | |
| 40 | |
| 41 return gauge; | |
| 42 } | |
| 43 | |
| 44 private static Gauge findGauge(double km, List<Gauge> gauges) { | |
| 45 for (Gauge gauge: gauges) { | |
| 46 if (gauge.getRange().contains(km)) { | |
| 47 return gauge; | |
| 48 } | |
| 49 } | |
| 50 return null; | |
| 51 } | |
| 52 } |