--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/backend/src/main/java/org/dive4elements/river/model/CrossSection.java	Thu Apr 25 15:23:37 2013 +0200
@@ -0,0 +1,198 @@
+package org.dive4elements.river.model;
+
+import java.io.Serializable;
+
+import java.util.List;
+import java.util.ArrayList;
+
+import java.awt.geom.Point2D;
+
+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.OneToOne;
+import javax.persistence.OneToMany;
+import javax.persistence.OrderBy;
+import javax.persistence.JoinColumn;
+
+import java.math.MathContext;
+import java.math.BigDecimal;
+
+import org.hibernate.Session;
+import org.hibernate.SQLQuery;
+import org.hibernate.Query;
+
+import org.hibernate.type.StandardBasicTypes;
+
+import org.dive4elements.river.backend.SessionHolder;
+
+@Entity
+@Table(name = "cross_sections")
+public class CrossSection
+implements   Serializable
+{
+    public static final MathContext PRECISION = new MathContext(6);
+
+    public static final String SQL_FAST_CROSS_SECTION_LINES =
+        "SELECT km, x, y, csl.id AS csl_id " +
+        "FROM cross_section_lines csl JOIN cross_section_points csp " +
+        "ON csp.cross_section_line_id = csl.id " +
+        "WHERE csl.cross_section_id = :cs_id AND " +
+        "km between :from_km AND :to_km " +
+        "ORDER BY csl.id, csp.col_pos";
+
+    private Integer                id;
+    private River                  river;
+    private TimeInterval           timeInterval;
+    private String                 description;
+    private List<CrossSectionLine> lines;
+
+    public CrossSection() {
+    }
+
+    public CrossSection(
+        River        river,
+        TimeInterval timeInterval,
+        String       description
+    ) {
+        this.river        = river;
+        this.timeInterval = timeInterval;
+        this.description  = description;
+    }
+
+    @Id
+    @SequenceGenerator(
+        name           = "SEQUENCE_CROSS_SECTIONS_ID_SEQ",
+        sequenceName   = "CROSS_SECTIONS_ID_SEQ",
+        allocationSize = 1)
+    @GeneratedValue(
+        strategy  = GenerationType.SEQUENCE,
+        generator = "SEQUENCE_CROSS_SECTIONS_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;
+    }
+
+    @OneToOne
+    @JoinColumn(name = "time_interval_id")
+    public TimeInterval getTimeInterval() {
+        return timeInterval;
+    }
+
+    public void setTimeInterval(TimeInterval timeInterval) {
+        this.timeInterval = timeInterval;
+    }
+
+    @Column(name = "description")
+    public String getDescription() {
+        return description;
+    }
+
+    public void setDescription(String description) {
+        this.description = description;
+    }
+
+    @OneToMany
+    @OrderBy("km")
+    @JoinColumn(name="cross_section_id")
+    public List<CrossSectionLine> getLines() {
+        return lines;
+    }
+
+    public void setLines(List<CrossSectionLine> lines) {
+        this.lines = lines;
+    }
+
+    public List<CrossSectionLine> getLines(double startKm, double endKm) {
+        Session session = SessionHolder.HOLDER.get();
+        Query query = session.createQuery(
+            "from CrossSectionLine where crossSection=:crossSection " +
+            "and km between :startKm and :endKm order by km");
+        query.setParameter("crossSection", this);
+        query.setParameter("startKm", new BigDecimal(startKm, PRECISION));
+        query.setParameter("endKm", new BigDecimal(endKm, PRECISION));
+
+        return query.list();
+    }
+
+    public List<FastCrossSectionLine> getFastLines(
+        double startKm,
+        double endKm
+    ) {
+        Session session = SessionHolder.HOLDER.get();
+
+        SQLQuery sqlQuery = session.createSQLQuery(SQL_FAST_CROSS_SECTION_LINES)
+            .addScalar("km",     StandardBasicTypes.DOUBLE)
+            .addScalar("x",      StandardBasicTypes.DOUBLE)
+            .addScalar("y",      StandardBasicTypes.DOUBLE)
+            .addScalar("csl_id", StandardBasicTypes.INTEGER);
+
+        sqlQuery
+            .setInteger("cs_id",  getId())
+            .setDouble("from_km", startKm)
+            .setDouble("to_km",   endKm);
+
+        List<Object []> results = sqlQuery.list();
+
+        ArrayList<Point2D> points = new ArrayList<Point2D>(500);
+        ArrayList<FastCrossSectionLine> lines =
+            new ArrayList<FastCrossSectionLine>();
+
+        Integer lastId = null;
+        Double  lastKm = null;
+
+        for (Object [] result: results) {
+            Double  km = (Double)result[0];
+            Double  x  = (Double)result[1];
+            Double  y  = (Double)result[2];
+            Integer id = (Integer)result[3];
+
+            if (lastId != null && !lastId.equals(id)) {
+                points.trimToSize();
+                FastCrossSectionLine line =
+                    new FastCrossSectionLine(lastKm, points);
+                lines.add(line);
+                points = new ArrayList<Point2D>(500);
+            }
+
+            Point2D p = new Point2D.Double(x, y);
+
+            if (CrossSectionLine.isValid(p)) {
+                points.add(p);
+            }
+
+            lastKm = km;
+            lastId = id;
+        }
+
+        if (lastId != null) {
+            points.trimToSize();
+            FastCrossSectionLine line =
+                new FastCrossSectionLine(lastKm, points);
+            lines.add(line);
+        }
+
+        lines.trimToSize();
+
+        return lines;
+    }
+}
+// vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :