Application: gvSIG desktop » gvSIG geoprocess

/*

 * Created on 16-feb-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: ScalableConvexHullVisitor.java 10626 2007-03-06 16:55:54Z caballero $

* $Log$

* 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 1.2  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 1.3  2006/03/15 18:31:06  azabala

* *** empty log message ***

*

* Revision 1.2  2006/03/07 21:01:33  azabala

* *** empty log message ***

*

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

* *** empty log message ***

*

* Revision 1.2  2006/03/05 19:57:48  azabala

* *** empty log message ***

*

* Revision 1.1  2006/02/17 16:32:50  azabala

* *** empty log message ***

*

*

*/

package org.gvsig.sextante.app.algorithm.convexhull;

import org.gvsig.fmap.geom.GeometryLocator;

import org.gvsig.fmap.geom.GeometryManager;

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

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

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

import org.gvsig.fmap.geom.operation.tojts.ToJTS;

import org.gvsig.fmap.geom.operation.fromjts.FromJTS;

import com.vividsolutions.jts.geom.Geometry;

import com.vividsolutions.jts.geom.GeometryCollection;

import com.vividsolutions.jts.geom.GeometryFactory;

import es.unex.sextante.core.Sextante;

/**

 * Convex Hull operation

 * @author Nacho Brodin (nachobrodin@gmail.com)

 */

public class ConvexHullOperation {

        public static final String  NAME             = "ConvexHull";

        public static final int     CODE             = GeometryLocator.getGeometryManager().getGeometryOperationCode(NAME);

        Geometry                    geometry         = null;

        GeometryFactory             geomFact         = null;

        private GeometryManager     geometryManager  = null;

        public ConvexHullOperation() {

                geometry = null;

                geometryManager = GeometryLocator.getGeometryManager();

        }

        /**

         * Returns FMap convex hull geometry.

         * @return

         */

        public org.gvsig.fmap.geom.Geometry getGeometry() {

                if(geometry == null)

                        return null;

                GeometryOperationContext ctx = new GeometryOperationContext();

                ctx.setAttribute(FromJTS.PARAM, geometry);

                try {

                        return (org.gvsig.fmap.geom.Geometry)geometryManager.invokeOperation(FromJTS.NAME, ctx);

                } catch (GeometryOperationNotSupportedException e) {

                        Sextante.addErrorToLog(e);

                        return null;

                } catch (GeometryOperationException e) {

                        Sextante.addErrorToLog(e);

                        return null;

                }

        }

        public org.gvsig.fmap.geom.Geometry invoke(org.gvsig.fmap.geom.Geometry g) {

                if(g == null)

                        return null;

                com.vividsolutions.jts.geom.Geometry actualGeometry = null;

                try {

                        actualGeometry = (Geometry)g.invokeOperation(ToJTS.CODE, null);

                } catch (GeometryOperationNotSupportedException e1) {

                        Sextante.addErrorToLog(e1);

                } catch (GeometryOperationException e1) {

                        Sextante.addErrorToLog(e1);

                }

                if(geometry == null)

                        geometry = actualGeometry;

                else {

                        com.vividsolutions.jts.geom.Geometry[] geoms = new com.vividsolutions.jts.geom.Geometry[2];

                        geoms[0] = geometry;

                        geoms[1] = actualGeometry;

                        if(geomFact == null)

                                geomFact = new GeometryFactory();

                        GeometryCollection gc = geomFact.createGeometryCollection(geoms);

                        geometry = gc.convexHull();        

                }

                return getGeometry();

        }

        public String getProcessDescription() {

                return "Computing convex hull in an scalable manner";

        }

        /*

         * (non-Javadoc)

         * @see org.gvsig.fmap.geom.operation.GeometryOperation#getOperationIndex()

         */

        public int getOperationIndex() {

                return CODE;

        }

}