| gvSIG desktop 1

package org.gvsig.data.datastores.vectorial.db.jdbc.postgresql;

import java.sql.SQLException;

import org.gvsig.fmap.geom.GeometryFactory;

import org.gvsig.fmap.geom.primitive.GeneralPathX;

import org.postgis.Geometry;

import org.postgis.LineString;

import org.postgis.LinearRing;

import org.postgis.MultiLineString;

import org.postgis.MultiPolygon;

import org.postgis.PGgeometry;

import org.postgis.Point;

import org.postgis.Polygon;

/**

 * Codigo recogido (en parte) de la lista de desarrollo de gvSIG

 * Enviado por: MAU ingmau00 en gmail.com

 * Fecha: Lun Ago 13 15:03:06 CEST 2007

 * Asunto: [Gvsig_desarrolladores] Crear una capa nueva

 *

 * @author jmvivo

 *

 */

public class PostGIS2Geometry {

        public static org.gvsig.fmap.geom.Geometry getGeneralPath(PGgeometry geom) throws

        SQLException{

                GeneralPathX gp = new GeneralPathX();

                org.gvsig.fmap.geom.Geometry resultGeom = null;

                if (geom.getGeoType() == Geometry.POINT) {

                        Point p = (Point) geom.getGeometry();

                        resultGeom = GeometryFactory.createPoint2D(p.x, p.y);

                } else if ( geom.getGeoType() == Geometry.LINESTRING) {

                        gp = lineString2GP((LineString) geom.getGeometry());

                } else if (geom.getGeoType() == Geometry.MULTILINESTRING) {

                        MultiLineString mls = (MultiLineString)  geom.getGeometry();

                        for (int j = 0; j < mls.numLines(); j++) {

                                gp.append(lineString2GP(mls.getLine(j)), false);

                        }

                        resultGeom = GeometryFactory.createPolyline2D(gp);

                } else if (geom.getGeoType() == Geometry.POLYGON ) {

                        gp = polygon2GP((Polygon) geom.getGeometry());

                        resultGeom = GeometryFactory.createPolygon2D(gp);

                } else if (geom.getGeoType() == Geometry.MULTIPOLYGON) {

                        MultiPolygon mp = (MultiPolygon) geom.getGeometry();

                        for (int i = 0; i <  mp.numPolygons(); i++) {

                                gp.append(polygon2GP(mp.getPolygon(i)), false);

                        }

                        resultGeom = GeometryFactory.createPolygon2D(gp);

                } else if (geom.getGeoType() == Geometry.GEOMETRYCOLLECTION) {

                        //FIXME: Falta Implementar!!!

                        throw new RuntimeException("geometryCollections not supported by this driver");

                } else {

                        throw new RuntimeException("Unknown datatype");

                }

                return resultGeom;

        }

        private static GeneralPathX polygon2GP(Polygon p) {

                GeneralPathX gp = new GeneralPathX();

                for (int r = 0; r < p.numRings(); r++) {

                        gp.append(linearRing2GP(p.getRing(r)), false);

                }

                return gp;

        }

        /**

         * DOCUMENT ME!

         *

         * @param lr DOCUMENT ME!

         *

         * @return DOCUMENT ME!

         */

        private static GeneralPathX linearRing2GP(LinearRing lr) {

                Point p;

                GeneralPathX gp = new GeneralPathX();

                if ((p = lr.getPoint(0)) != null) {

                        gp.moveTo(p.x, p.y);

                        for (int i = 1; i < lr.numPoints(); i++) {

                                p = lr.getPoint(i);

                                gp.lineTo(p.x, p.y );

                        }

                }

                gp.closePath();

                return gp;

        }

        /**

         * DOCUMENT ME!

         *

         * @param ls DOCUMENT ME!

         *

         * @return DOCUMENT ME!

         */

        private static GeneralPathX lineString2GP(LineString ls) {

                Point p;

                GeneralPathX gp = new GeneralPathX();

                if ((p = ls.getPoint(0)) != null) {

                        gp.moveTo(p.x , p.y);

                        for (int i = 1; i < ls.numPoints(); i++) {

                                p = ls.getPoint(i);

                                gp.lineTo(p.x, p.y);

                        }

                }

                return gp;

        }

}