Subversion Repositories hibernate-spatial

/*

 * $Id: PolygonEncoder.java 156 2010-01-28 22:59:30Z maesenka $

 *

 * This file is part of Hibernate Spatial, an extension to the

 * hibernate ORM solution for geographic data.

 *

 * Copyright © 2009 Geovise BVBA

 *

 * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

 *

 * For more information, visit: http://www.hibernatespatial.org/

 */

package org.hibernatespatial.sqlserver.convertors;

import com.vividsolutions.jts.geom.Coordinate;

import com.vividsolutions.jts.geom.Geometry;

import com.vividsolutions.jts.geom.LineString;

import com.vividsolutions.jts.geom.Polygon;

import java.util.List;

public class PolygonEncoder extends AbstractEncoder<Polygon> {

    private static Shape SHAPE = new Shape(-1, 0, OpenGisType.POLYGON);

    public boolean accepts(Geometry geom) {

        return geom instanceof Polygon;

    }

    @Override

    protected void encode(Geometry geom, int parentShapeIndex, List<Coordinate> coordinates, List<Figure> figures, List<Shape> shapes) {

        if (! (geom instanceof Polygon)) throw new IllegalArgumentException("Polygon geometry expected.");

        Polygon polygon = (Polygon)geom;

        int figureOffset = figures.size();

        shapes.add( new Shape(parentShapeIndex, figureOffset, OpenGisType.POLYGON));

        int pointOffset = coordinates.size();

        addExteriorRing(polygon, coordinates, figures);

        addInteriorRings(polygon, coordinates, figures);

    }

    private void addInteriorRings(Polygon geom, List<Coordinate> coordinates, List<Figure> figures){

        for (int idx = 0; idx < geom.getNumInteriorRing(); idx++){

            addInteriorRing(geom.getInteriorRingN(idx), coordinates, figures);

        }

    }

    private void addInteriorRing(LineString ring, List<Coordinate> coordinates, List<Figure> figures) {

        int pointOffset = coordinates.size();

        addPoints(ring, coordinates);

        Figure figure = new Figure(FigureAttribute.InteriorRing, pointOffset);

        figures.add(figure);

    }

    private void addPoints(LineString ring, List<Coordinate> coordinates) {

        for (Coordinate c : ring.getCoordinates()){

            coordinates.add(c);

        }

    }

    private void addExteriorRing(Polygon geom, List<Coordinate> coordinates, List<Figure> figures) {

        LineString shell = geom.getExteriorRing();

        int offset = coordinates.size();

        addPoints(shell, coordinates);

        Figure exterior = new Figure(FigureAttribute.ExteriorRing, offset);

        figures.add(exterior);

    }

}