Application: gvSIG desktop

/* gvSIG. Geographic Information System of the Valencian Government

*

* Copyright (C) 2007-2008 Infrastructures and Transports Department

* of the Valencian Government (CIT)

* 

* This program is free software; you can redistribute it and/or

* modify it under the terms of the GNU General Public License

* as published by the Free Software Foundation; either version 2

* of the License, or (at your option) any later version.

* 

* This program 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 General Public License for more details.

* 

* You should have received a copy of the GNU General Public License

* along with this program; if not, write to the Free Software

* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, 

* MA  02110-1301, USA.

* 

*/

/*

* AUTHORS (In addition to CIT):

* 2009 {Iver T.I.}   {Task}

*/

package org.gvsig.fmap.geom.operation.tojts;

import java.util.ArrayList;

import java.util.List;

import com.vividsolutions.jts.geom.MultiPolygon;

import com.vividsolutions.jts.geom.Polygon;

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;

import org.gvsig.fmap.geom.Geometry;

import org.gvsig.fmap.geom.aggregate.MultiSurface;

import org.gvsig.fmap.geom.operation.GeometryOperationContext;

import org.gvsig.fmap.geom.operation.GeometryOperationException;

import org.gvsig.fmap.geom.operation.GeometryOperationNotSupportedException;

/**

 * @author <a href="mailto:jpiera@gvsig.org">Jorge Piera</a>

 */

public class MultiSurfaceToJTS  extends ToJTS{

    private static Logger logger = LoggerFactory.getLogger(MultiSurfaceToJTS.class);

        /*

         * (non-Javadoc)

         * @see org.gvsig.fmap.geom.operation.tojts.ToJTS#invoke(org.gvsig.fmap.geom.Geometry, org.gvsig.fmap.geom.operation.GeometryOperationContext)

         */

        public Object invoke(Geometry geom, GeometryOperationContext ctx) throws GeometryOperationException {

                int srid = -1;

                if (ctx != null){

                        srid = ((JTSGeometryOperationContext)ctx).getSrid();

                }

                MultiSurface multiSurface = (MultiSurface)geom;

                List prim_list = new ArrayList();

                int prim_n = multiSurface.getPrimitivesNumber();

                Object item = null;

        for (int i = 0; i < prim_n; i++){

                try {

                    item = multiSurface.getPrimitiveAt(i).invokeOperation(CODE, ctx);

                    if (item instanceof MultiPolygon) {

                        /*

                         * Considering also multi polygons

                         */

                        MultiPolygon mpo = (MultiPolygon) item;

                        for (int k=0; k<mpo.getNumGeometries(); k++) {

                            if (mpo.getGeometryN(k) instanceof Polygon) {

                                prim_list.add(mpo.getGeometryN(k));

                            }

                        }

                    } else {

                    if (item instanceof Polygon) {

                        /*

                         * Including primitives converted to polygon.

                         * Short primitives can return a point or line

                         */

                        prim_list.add(item);

                    } else {

                        String txt = (item == null) ? "NULL" : item.getClass().getName();

                        logger.info("Warning: excluding primitive in MultiSurfaceToJTS because it converted to a JTS " + txt);

                    }

                    }

                        } catch (GeometryOperationNotSupportedException e) {

                                throw new GeometryOperationException(e);

                        }

        }       

        Polygon[] polygons = (Polygon[]) prim_list.toArray(new Polygon[0]);

        MultiPolygon polygon = new com.vividsolutions.jts.geom.GeometryFactory().createMultiPolygon(polygons);

            polygon.setSRID(srid);

        return polygon;

        }        

}