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PostGIS adds support for geographic objects to the PostgreSQL object-relational database.
There is a newer version: 2023.1.0
/*
 * LinearRing.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;
import java.util.List;


/**
 * This represents the LinearRing GIS datatype. This type is used to construct
 * the polygon types, but is not stored or retrieved directly from the database.
 */
public class LinearRing extends PointComposedGeom {
    /* JDK 1.5 Serialization */
    private static final long serialVersionUID = 0x100;

    public LinearRing(Point[] points) {
        super(LINEARRING, points);
    }

    /**
     * This is called to construct a LinearRing from the PostGIS string
     * representation of a ring.
     * 
     * @param value Definition of this ring in the PostGIS string format.
     * @throws SQLException when a SQLException occurs
     */
    public LinearRing(String value) throws SQLException {
        this(value, false);
    }

    /**
     * @param value The text representation of this LinearRing
     * @param haveM Hint whether we have a measure. This is given to us by other
     *            "parent" Polygon, and is passed further to our parent.
     * @throws SQLException when a SQLException occurs
     */

    protected LinearRing(String value, boolean haveM) throws SQLException {
        super(LINEARRING);
        String valueNoParans = GeometryTokenizer.removeLeadingAndTrailingStrings(value.trim(), "(", ")");
        List tokens = GeometryTokenizer.tokenize(valueNoParans, ',');
        int npoints = tokens.size();
        Point[] points = new Point[npoints];
        for (int p = 0; p < npoints; p++) {
            points[p] = new Point(tokens.get(p), haveM);
        }
        this.dimension = points[0].dimension;
        // fetch haveMeasure from subpoint because haveM does only work with
        // 2d+M, not with 3d+M geometries
        this.haveMeasure = points[0].haveMeasure;
        this.subgeoms = points;
    }

}