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PostGIS adds support for geographic objects to the PostgreSQL object-relational database.
There is a newer version: 2023.1.0
/*
 * LineString.java
 * 
 * PostGIS extension for PostgreSQL JDBC driver - geometry model
 * 
 * (C) 2004 Paul Ramsey, [email protected]
 * 
 * (C) 2005 Markus Schaber, [email protected]
 * 
 * (C) 2015 Phillip Ross, [email protected]
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 * 
 */

package org.postgis;

import java.sql.SQLException;

public class LineString extends PointComposedGeom {
    /* JDK 1.5 Serialization */
    private static final long serialVersionUID = 0x100;

    double len = -1.;

    public LineString() {
        super(LINESTRING);
    }

    public LineString(Point[] points) {
        super(LINESTRING, points);
    }

    public LineString(String value) throws SQLException {
        super(LINESTRING, value);
    }

    public LineString(String value, boolean haveM) throws SQLException {
        super(LINESTRING, value, haveM);
    }

    public LineString reverse() {
        Point[] points = this.getPoints();
        int l = points.length;
        int i, j;
        Point[] p = new Point[l];
        for (i = 0, j = l - 1; i < l; i++, j--) {
            p[i] = points[j];
        }
        return new LineString(p);
    }

    public LineString concat(LineString other) {
        Point[] points = this.getPoints();
        Point[] opoints = other.getPoints();

        boolean cutPoint = this.getLastPoint() == null
                || this.getLastPoint().equals(other.getFirstPoint());
        int count = points.length + opoints.length - (cutPoint ? 1 : 0);
        Point[] p = new Point[count];

        // Maybe we should use System.arrayCopy here?
        int i, j;
        for (i = 0; i < points.length; i++) {
            p[i] = points[i];
        }
        if (!cutPoint) {
            p[i++] = other.getFirstPoint();
        }
        for (j = 1; j < opoints.length; j++, i++) {
            p[i] = opoints[j];
        }
        return new LineString(p);
    }

    public double length() {
        if (len < 0) {
            Point[] points = this.getPoints();
            if ((points == null) || (points.length < 2)) {
                len = 0;
            } else {
                double sum = 0;
                for (int i = 1; i < points.length; i++) {
                    sum += points[i - 1].distance(points[i]);
                }
                len = sum;
            }
        }
        return len;
    }
}