--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/backend/src/main/java/org/dive4elements/river/model/Gauge.java	Thu Apr 25 15:23:37 2013 +0200
@@ -0,0 +1,334 @@
+package org.dive4elements.river.model;
+
+import java.math.BigDecimal;
+
+import java.io.Serializable;
+
+import java.util.List;
+
+import javax.persistence.Entity;
+import javax.persistence.Id;
+import javax.persistence.Table;
+import javax.persistence.GeneratedValue;
+import javax.persistence.Column;
+import javax.persistence.SequenceGenerator;
+import javax.persistence.GenerationType;
+import javax.persistence.JoinColumn;
+import javax.persistence.OneToOne;
+import javax.persistence.OneToMany;
+
+import org.hibernate.Session;
+import org.hibernate.Query;
+
+import org.dive4elements.river.backend.SessionHolder;
+
+/** Database-mapped Gauge with all info about it. */
+@Entity
+@Table(name = "gauges")
+public class Gauge
+implements   Serializable, Comparable<Gauge>
+{
+    public static final int DEFAULT_SCALE = 100;
+
+    public static final int MASTER_DISCHARGE_TABLE = 0;
+
+    private Integer    id;
+    private String     name;
+    private River      river;
+    private BigDecimal station;
+    private BigDecimal aeo;
+    private BigDecimal datum;
+    private Long       officialNumber;
+    private Range      range;
+
+    private List<DischargeTable> dischargeTables;
+
+    /** MainValues at this Gauge. */
+    protected List<MainValue> mainValues;
+
+    public Gauge() {
+    }
+
+    public Gauge(
+        String     name,
+        River      river,
+        BigDecimal station,
+        BigDecimal aeo,
+        BigDecimal datum,
+        Long       officialNumber,
+        Range      range
+    ) {
+        this.name            = name;
+        this.river           = river;
+        this.station         = station;
+        this.aeo             = aeo;
+        this.datum           = datum;
+        this.officialNumber  = officialNumber;
+        this.range           = range;
+    }
+
+    @Id
+    @SequenceGenerator(
+        name           = "SEQUENCE_GAUGES_ID_SEQ",
+        sequenceName   = "GAUGES_ID_SEQ",
+        allocationSize = 1)
+    @GeneratedValue(
+        strategy  = GenerationType.SEQUENCE,
+        generator = "SEQUENCE_GAUGES_ID_SEQ")
+    @Column(name = "id")
+    public Integer getId() {
+        return id;
+    }
+
+    public void setId(Integer id) {
+        this.id = id;
+    }
+
+    @OneToOne
+    @JoinColumn(name = "river_id" )
+    public River getRiver() {
+        return river;
+    }
+
+    public void setRiver(River river) {
+        this.river = river;
+    }
+
+    @Column(name = "name")
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    @Column(name = "station") // FIXME: type mapping needed
+    public BigDecimal getStation() {
+        return station;
+    }
+
+    public void setStation(BigDecimal station) {
+        this.station = station;
+    }
+
+    @Column(name = "aeo") // FIXME: type mapping needed
+    public BigDecimal getAeo() {
+        return aeo;
+    }
+
+    public void setAeo(BigDecimal aeo) {
+        this.aeo = aeo;
+    }
+
+    @Column(name = "datum") // FIXME: type mapping needed
+    public BigDecimal getDatum() {
+        return datum;
+    }
+
+    public void setDatum(BigDecimal datum) {
+        this.datum = datum;
+    }
+
+    @Column(name = "official_number")
+    public Long getOfficialNumber() {
+        return officialNumber;
+    }
+
+    public void setOfficialNumber(Long officialNumber) {
+        this.officialNumber = officialNumber;
+    }
+
+    @OneToOne
+    @JoinColumn(name = "range_id" )
+    public Range getRange() {
+        return range;
+    }
+
+    public void setRange(Range range) {
+        this.range = range;
+    }
+
+    @OneToMany
+    @JoinColumn(name = "gauge_id")
+    public List<DischargeTable> getDischargeTables() {
+        return dischargeTables;
+    }
+
+    public void setDischargeTables(List<DischargeTable> dischargeTables) {
+        this.dischargeTables = dischargeTables;
+    }
+
+
+    /**
+     * Returns min and max W values of this gauge based with a DEFAULT_SCALE.
+     *
+     * @return min and max W value of this gauge [min,max].
+     */
+    public double[] determineMinMaxW() {
+        return determineMinMaxW(DEFAULT_SCALE);
+    }
+
+
+    /**
+     * Returns min and max W values of this gauge.
+     *
+     * @return the min and max W value of this gauge [min,max].
+     */
+    public double[] determineMinMaxW(int scale) {
+        Session session = SessionHolder.HOLDER.get();
+
+        List<DischargeTable> tables   = getDischargeTables();
+        DischargeTable dischargeTable = null;
+
+        for (DischargeTable tmp: tables) {
+            if (tmp.getKind() == 0) {
+                dischargeTable = tmp;
+                break;
+            }
+        }
+
+        if (dischargeTable == null) {
+            return null;
+        }
+
+        Query query  = session.createQuery(
+            "select min(w) as min, max(w) as max from DischargeTableValue " +
+            "where table_id =:table");
+        query.setParameter("table", dischargeTable.getId());
+
+        List     results = query.list();
+        Object[] result  = (Object[]) results.get(0);
+
+        return result != null
+            ? new double[] {
+                ((BigDecimal) result[0]).doubleValue() * scale,
+                ((BigDecimal) result[1]).doubleValue() * scale}
+            : null;
+    }
+
+    @OneToMany
+    @JoinColumn(name = "gauge_id")
+    public List<MainValue> getMainValues() {
+        return mainValues;
+    }
+
+    public void setMainValues(List<MainValue> mainValues) {
+        this.mainValues = mainValues;
+    }
+
+
+    public static Gauge getGaugeByOfficialNumber(long number) {
+        Session session = SessionHolder.HOLDER.get();
+
+        Query query = session.createQuery(
+            "from Gauge where officialNumber=:number");
+
+        query.setParameter("number", number);
+
+        List<Gauge> results = query.list();
+
+        return results.isEmpty() ? null : results.get(0);
+    }
+
+
+    public DischargeTable fetchMasterDischargeTable() {
+        for (DischargeTable dt: dischargeTables) {
+            if (dt.getKind() == MASTER_DISCHARGE_TABLE) {
+                return dt;
+            }
+        }
+
+        return null;
+    }
+
+    /**
+     * Returns an array of [days, qs] necessary to create duration curves.
+     *
+     * @return a 2dim array of [days, qs] where days is an int[] and qs is
+     * an double[].
+     */
+    public Object[] fetchDurationCurveData() {
+        Session session = SessionHolder.HOLDER.get();
+
+        Query query = session.createQuery(
+            "select cast(nmv.name as integer) as days, mv.value as q " +
+            "from MainValue as mv " +
+            "join mv.mainValue as nmv " +
+            "join nmv.type mvt " +
+            "where mvt.name = 'D' and mv.gauge.id = :gauge_id " +
+            "order by days");
+
+        query.setParameter("gauge_id", getId());
+
+        List<Object> results = query.list();
+        int[]        days    = new int[results.size()];
+        double[]     qs      = new double[results.size()];
+
+        int idx = 0;
+
+        for (Object obj: results) {
+            Object[] arr = (Object[]) obj;
+
+            try {
+                int  day = ((Integer)    arr[0]).intValue();
+                double q = ((BigDecimal) arr[1]).doubleValue();
+
+                days[idx] = day;
+                qs[idx++] = q;
+            }
+            catch (NumberFormatException nfe) {
+            }
+        }
+
+        return new Object[] { days, qs };
+    }
+
+    /**
+     * Calculates the maximum and minimum W and Q values
+     *
+     * @return the MaxMinWQ object representing the calculated values
+     */
+    public MinMaxWQ fetchMaxMinWQ() {
+        Session session = SessionHolder.HOLDER.get();
+
+        Query query = session.createQuery(
+            "select max(mv.value) as max, min(mv.value) as min " +
+            "from MainValue as mv " +
+            "join mv.mainValue as nmv " +
+            "join nmv.type mvt " +
+            "where mvt.name in ('W', 'Q') " +
+            "and mv.gauge.id = :gauge_id " +
+            "group by mvt.name order by mvt.name"
+            );
+
+        query.setParameter("gauge_id", getId());
+
+        List<Object> results = query.list();
+        if (results.isEmpty()) {
+            // No values found
+            return new MinMaxWQ();
+        }
+
+        Object[] arr = (Object[]) results.get(0);
+        BigDecimal maxw = (BigDecimal)arr[0];
+        BigDecimal minw = (BigDecimal)arr[1];
+        BigDecimal maxq = null;
+        BigDecimal minq = null;
+
+
+        if (results.size() > 1) {
+            arr = (Object[]) results.get(1);
+            maxq = (BigDecimal)arr[0];
+            minq = (BigDecimal)arr[1];
+        }
+
+        return new MinMaxWQ(minw, maxw, minq, maxq);
+    }
+
+    @Override
+    public int compareTo(Gauge o) {
+        return getName().compareTo(o.getName());
+    }
+}
+// vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :