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);
    }


}