mschaefer@8898: /* Copyright (C) 2017 by Bundesanstalt für Gewässerkunde
mschaefer@8898:  * Software engineering by
mschaefer@8898:  *  Björnsen Beratende Ingenieure GmbH
mschaefer@8898:  *  Dr. Schumacher Ingenieurbüro für Wasser und Umwelt
mschaefer@8898:  *
mschaefer@8898:  * This file is Free Software under the GNU AGPL (>=v3)
mschaefer@8898:  * and comes with ABSOLUTELY NO WARRANTY! Check out the
mschaefer@8898:  * documentation coming with Dive4Elements River for details.
mschaefer@8898:  */
mschaefer@8898: 
gernotbelger@8915: package org.dive4elements.river.artifacts.sinfo.tkhcalculation;
mschaefer@8898: 
gernotbelger@8915: import java.util.Calendar;
mschaefer@8898: import java.util.Date;
mschaefer@8898: import java.util.List;
mschaefer@8898: 
mschaefer@8898: import org.apache.commons.lang.math.DoubleRange;
mschaefer@8898: import org.apache.commons.math.ArgumentOutsideDomainException;
mschaefer@8898: import org.apache.commons.math.analysis.interpolation.LinearInterpolator;
mschaefer@8898: import org.apache.commons.math.analysis.polynomials.PolynomialSplineFunction;
mschaefer@8898: import org.apache.log4j.Logger;
mschaefer@8920: import org.dive4elements.river.artifacts.math.Utils;
mschaefer@8898: import org.dive4elements.river.backend.SedDBSessionHolder;
mschaefer@8898: import org.dive4elements.river.model.River;
mschaefer@8898: import org.hibernate.SQLQuery;
mschaefer@8898: import org.hibernate.Session;
mschaefer@8898: import org.hibernate.type.StandardBasicTypes;
mschaefer@8898: 
mschaefer@8920: import gnu.trove.TDoubleArrayList;
mschaefer@8920: 
mschaefer@8898: /**
gernotbelger@8915:  * Searchable sorted km array with parallel bed measurements value array and linear interpolation for km and d50 between
gernotbelger@8915:  * the array elements.<br />
mschaefer@8901:  * <br />
mschaefer@8901:  * See comment of SQL command on how the values are filtered and aggregated.
gernotbelger@8915:  *
mschaefer@8898:  * @author Matthias Schäfer
mschaefer@8898:  *
mschaefer@8898:  */
mschaefer@8920: public class BedQualityD50KmValueFinder {
gernotbelger@8915: 
mschaefer@8898:     /***** FIELDS *****/
gernotbelger@8915: 
mschaefer@8898:     /**
mschaefer@8898:      * Private log to use here.
mschaefer@8898:      */
mschaefer@8898:     private static Logger log = Logger.getLogger(BedQualityD50KmValueFinder.class);
mschaefer@8898: 
mschaefer@8898:     /**
mschaefer@8920:      * Query selecting all sub layer bed measurements with their d50 for a km range and a time period<br />
mschaefer@8898:      * <br />
mschaefer@8898:      * A km may have bed measurements for multiple dates, multiple distances from the river bank, and multiple depth layers.
mschaefer@8920:      * The query filters by km range, time period and layer (sub layer: below bed to max. 50 cm depth).<br />
mschaefer@8920:      * 
mschaefer@8920:      * If PostgreSQL would support a median aggregate function like Oracle does, the aggregation could be placed into this query.
mschaefer@8898:      */
mschaefer@8898:     private static final String SQL_BED_D50_SUBLAYER_MEASUREMENT =
mschaefer@8920:     "SELECT t.km, t.datum, p.tiefevon, p.tiefebis, a.d50"
mschaefer@8920:         + " FROM sohltest t INNER JOIN station s ON t.stationid = s.stationid"
mschaefer@8920:         + "    INNER JOIN gewaesser g ON s.gewaesserid = g.gewaesserid"
mschaefer@8920:         + "    INNER JOIN sohlprobe p ON t.sohltestid = p.sohltestid"
mschaefer@8920:         + "    INNER JOIN siebanalyse a ON p.sohlprobeid = a.sohlprobeid"
mschaefer@8920:         + " WHERE (g.name = :name) AND (s.km BETWEEN :fromkm - 0.0001 AND :tokm + 0.0001)"
mschaefer@8920:         + "    AND (p.tiefevon > 0.0) AND (p.tiefebis <= 0.5)"
mschaefer@8920:         + "    AND (t.datum BETWEEN :fromdate AND :todate)"
mschaefer@8920:         + " ORDER BY t.km ASC, a.d50 ASC";
mschaefer@8898: 
mschaefer@8898:     /**
mschaefer@8920:      * Real linear interpolator for kms and d50 values (m)
mschaefer@8898:      */
gernotbelger@8915:     private final PolynomialSplineFunction interpolator;
gernotbelger@8915: 
gernotbelger@8915: 
mschaefer@8920:     /***** CONSTRUCTORS *****/
mschaefer@8920:     
gernotbelger@8915:     private BedQualityD50KmValueFinder(final double[] kms, final double[] values) {
gernotbelger@8915:         this.interpolator = new LinearInterpolator().interpolate(kms, values);
gernotbelger@8915:     }
gernotbelger@8915: 
mschaefer@8920:     /***** METHODS *****/
mschaefer@8920:     
mschaefer@8898:     /**
gernotbelger@8915:      * Sohlbeschaffenheit (D50 Korndurchmesser aus Seddb)
gernotbelger@8915:      * Abhängig von Peiljahr
mschaefer@8898:      */
gernotbelger@8915:     public static BedQualityD50KmValueFinder loadBedMeasurements(final River river, final DoubleRange kmRange, final int soundingYear, final int validYears) {
gernotbelger@8915: 
gernotbelger@8915:         /* construct valid measurement time range */
gernotbelger@8915:         final Calendar cal = Calendar.getInstance();
gernotbelger@8915:         cal.clear();
gernotbelger@8915: 
gernotbelger@8915:         cal.set(soundingYear - validYears, 0, 1);
gernotbelger@8915:         final Date startTime = cal.getTime();
gernotbelger@8915: 
gernotbelger@8915:         cal.set(soundingYear + validYears, 11, 31);
gernotbelger@8915:         final Date endTime = cal.getTime();
gernotbelger@8915: 
gernotbelger@8915:         log.debug(String.format("loadValues km %.3f - %.3f %tF - %tF", kmRange.getMinimumDouble(), kmRange.getMaximumDouble(), startTime, endTime));
gernotbelger@8915:         final Session session = SedDBSessionHolder.HOLDER.get();
gernotbelger@8915:         final SQLQuery sqlQuery = session.createSQLQuery(SQL_BED_D50_SUBLAYER_MEASUREMENT).addScalar("km", StandardBasicTypes.DOUBLE)
mschaefer@8920:                 .addScalar("datum", StandardBasicTypes.DATE).addScalar("tiefevon", StandardBasicTypes.DOUBLE)
mschaefer@8920:                 .addScalar("tiefebis", StandardBasicTypes.DOUBLE).addScalar("d50", StandardBasicTypes.DOUBLE);
gernotbelger@8915:         final String seddbRiver = river.nameForSeddb();
mschaefer@8898:         sqlQuery.setString("name", seddbRiver);
mschaefer@8898:         sqlQuery.setDouble("fromkm", kmRange.getMinimumDouble());
mschaefer@8898:         sqlQuery.setDouble("tokm", kmRange.getMaximumDouble());
gernotbelger@8915:         sqlQuery.setDate("fromdate", startTime);
gernotbelger@8915:         sqlQuery.setDate("todate", endTime);
gernotbelger@8915: 
mschaefer@8898:         final List<Object[]> rows = sqlQuery.list();
mschaefer@8920:         final TDoubleArrayList kms = new TDoubleArrayList();
mschaefer@8920:         final TDoubleArrayList values = new TDoubleArrayList();
mschaefer@8920:         final TDoubleArrayList kmd50s = new TDoubleArrayList();
mschaefer@8920:         for (int i = 0; i <= rows.size() - 1; i++) {
mschaefer@8920:             kmd50s.add((double) rows.get(i)[4]);
mschaefer@8920:             if (((i == rows.size() - 1) || !Utils.epsilonEquals((double) rows.get(i)[0], (double) rows.get(i+1)[0], 0.0001))) {
mschaefer@8920:                 int k = kmd50s.size() / 2;
mschaefer@8920:                 values.add(((k + k < kmd50s.size()) ? kmd50s.get(k) : (kmd50s.get(k-1) + kmd50s.get(k)) / 2) / 1000);
mschaefer@8920:                 kms.add((double) rows.get(i)[0]);
mschaefer@8920:                 log.debug(String.format("loadValues km %.3f d50(mm) %.1f count %d", kms.get(kms.size()-1), values.get(values.size()-1), kmd50s.size()));
mschaefer@8920:                 kmd50s.clear();
mschaefer@8920:         }
mschaefer@8898:         }
mschaefer@8911:         try {
mschaefer@8920:             return new BedQualityD50KmValueFinder(kms.toNativeArray(), values.toNativeArray());
gernotbelger@8915:         }
gernotbelger@8915:         catch (final Exception e) {
gernotbelger@8915:             e.printStackTrace();
gernotbelger@8915:             return null;
mschaefer@8911:         }
mschaefer@8898:     }
mschaefer@8898: 
gernotbelger@8915:     /**
gernotbelger@8915:      * Returns the d50 value interpolated according to a km
gernotbelger@8915:      *
mschaefer@8920:      * @return d50 (m) of the km, or NaN
gernotbelger@8915:      */
gernotbelger@8915:     public double findD50(final double km) throws ArgumentOutsideDomainException {
gernotbelger@8915:         return this.interpolator.value(km);
gernotbelger@8915:         /*
gernotbelger@8915:          * ohne interpolation:
gernotbelger@8915:          * if ((kms == null) || (kms.size() == 0))
gernotbelger@8915:          * return Double.NaN;
gernotbelger@8915:          * int i = kms.binarySearch(km);
gernotbelger@8915:          * if (i >= 0)
gernotbelger@8915:          * return values.get(i);
gernotbelger@8915:          * i = -i - 1;
gernotbelger@8915:          * if ((i - 1 >= 0) && Utils.epsilonEquals(km, kms.get(i - 1), 0.0001))
gernotbelger@8915:          * return values.get(i - 1);
gernotbelger@8915:          * else if ((i >= 0) && (i <= kms.size() - 1) && Utils.epsilonEquals(km, kms.get(i), 0.0001))
gernotbelger@8915:          * return values.get(i);
gernotbelger@8915:          * else
gernotbelger@8915:          * return Double.NaN;
gernotbelger@8915:          */
gernotbelger@8915:     }
gernotbelger@8915: }