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annotate artifacts/src/main/java/org/dive4elements/river/utils/GaugeIndex.java @ 8850:6823991e1ed1

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