| gvSIG desktop 1

/*

 * Created on 03-mar-2006

 *

 * gvSIG. Sistema de Informaci?n Geogr?fica de la Generalitat Valenciana

 *

 * Copyright (C) 2004 IVER T.I. and Generalitat Valenciana.

 *

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

 *

 * For more information, contact:

 *

 *  Generalitat Valenciana

 *   Conselleria d'Infraestructures i Transport

 *   Av. Blasco Ib??ez, 50

 *   46010 VALENCIA

 *   SPAIN

 *

 *      +34 963862235

 *   gvsig@gva.es

 *      www.gvsig.gva.es

 *

 *    or

 *

 *   IVER T.I. S.A

 *   Salamanca 50

 *   46005 Valencia

 *   Spain

 *

 *   +34 963163400

 *   dac@iver.es

 */

/* CVS MESSAGES:

*

* $Id: ScalableUnionVisitor.java 12949 2007-08-07 15:23:01Z azabala $

* $Log$

* Revision 1.3  2007-08-07 15:23:01  azabala

* centrilizing JTS in JTSFacade

*

* Revision 1.2  2007/03/06 16:47:58  caballero

* Exceptions

*

* Revision 1.1  2006/06/20 18:20:45  azabala

* first version in cvs

*

* Revision 1.3  2006/06/08 18:20:59  azabala

* modificaciones para admitir capas de shapeType MULTI

*

* Revision 1.2  2006/06/02 18:21:28  azabala

* *** empty log message ***

*

* Revision 1.1  2006/05/24 21:13:31  azabala

* primera version en cvs despues de refactoring orientado a crear un framework extensible de geoprocessing

*

* Revision 1.2  2006/05/01 19:16:10  azabala

* optimizada la union mediante buffer(0)

*

* Revision 1.1  2006/03/06 19:48:39  azabala

* *** empty log message ***

*

* Revision 1.1  2006/03/05 19:57:48  azabala

* *** empty log message ***

*

*

*/

package com.iver.cit.gvsig.geoprocess.impl.convexhull.fmap;

import com.iver.cit.gvsig.exceptions.visitors.ProcessVisitorException;

import com.iver.cit.gvsig.exceptions.visitors.VisitorException;

import com.iver.cit.gvsig.fmap.core.IGeometry;

import com.iver.cit.gvsig.geoprocess.core.fmap.XTypes;

import com.iver.cit.gvsig.geoprocess.core.util.JTSFacade;

import com.vividsolutions.jts.geom.Geometry;

//TODO Este Visitor no deber?a heredar del anterior, puesto que las

//llamadas getJtsConvexHull() no devuelven un convex hull, sino una

//uni?n.

public class ScalableUnionVisitor extends ScalableConvexHullVisitor {

        //geometry type of the layer whose features we are going to fussion

        //(polygon features are optimized in jts with buffer(0) trick, the

        //nor the rest

        int geometryType;

        public ScalableUnionVisitor(int geometryType){

                super();

                this.geometryType = geometryType;

        }

        public void visit(IGeometry g, int index) throws VisitorException, ProcessVisitorException {

                if(g == null)

                        return;

                /*

                 * TODO Aqu? estamos desechando aquellas geometrias cuyo tipo

                 * no es POLYGON (el tipo MULTI no aparece por ning?n lado)

                 * 

                 * Se puede dar el caso de que una capa tenga polilineas cerradas,

                 * y el usuario visualmente piensa que son poligonos.

                 * 

                 * Podemos considerar aqu? este caso.

                 * 

                 * */

                if(g.getGeometryType() != XTypes.POLYGON &&

                                g.getGeometryType() != XTypes.MULTI)

                        return;

                Geometry actualGeometry = g.toJTSGeometry();

                if(geometry == null){

                        geometry = actualGeometry;

                }else{

                        Geometry[] geoms = new Geometry[2];

                        geoms[0] = geometry;

                        geoms[1] = actualGeometry;

                        geometry = JTSFacade.union(geoms, geometryType);

                }

        }

}