Application: gvSIG desktop

/*

 * Created on 01-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: NearestFeatureVisitor.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 21:09:47  azabala

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

*

* 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 1.1  2006/03/05 19:59:47  azabala

* *** empty log message ***

*

*

*/

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

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

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

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

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

import com.iver.cit.gvsig.fmap.layers.FLayer;

import com.iver.cit.gvsig.fmap.layers.layerOperations.VectorialData;

import com.iver.cit.gvsig.fmap.operations.strategies.FeatureVisitor;

import com.vividsolutions.jts.geom.Geometry;

/**

 * This Visitor looks for the nearest feature of a FLayer B

 *  to a specified feature of a FLayer A.

 * @author azabala

 *

 */

public class NearestFeatureVisitor implements FeatureVisitor {

        private Geometry queryGeometry;

        private int solutionIndex = -1;

        private double shortestDist = Double.MAX_VALUE;

        public NearestFeatureVisitor(Geometry geometry){

                this.queryGeometry = geometry;

        }

        public NearestFeatureVisitor(){        

        }

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

                if(g == null)

                        return;

                double dist = queryGeometry.distance(g.toJTSGeometry());

                if(dist < shortestDist){

                        shortestDist = dist;

                        solutionIndex = index;

                }//if

        }

        public int getNearestFeatureIndex(){

                return solutionIndex;

        }

        public double getShortestDist(){

                return shortestDist;

        }

        public boolean hasFoundShortest(){

                return solutionIndex != -1;

        }

        public void stop(FLayer layer) throws VisitorException {

        }

        public boolean start(FLayer layer) throws StartVisitorException {

                if (layer instanceof VectorialData) {

                        return true;

                }

                return false;

        }

        public String getProcessDescription() {

                return "Looking nearest geometry for a spatial join";

        }

        public void setQueryGeometry(Geometry queryGeometry) {

                this.queryGeometry = queryGeometry;

        }

}