| gvSIG desktop 1

/* 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

 */

package com.iver.cit.gvsig.fmap.operations.strategies;

import java.awt.geom.Rectangle2D;

import com.hardcode.gdbms.driver.exceptions.ReadDriverException;

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.FBitSet;

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

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

/**

 * Visitor de zoom a lo seleccionado.

 *

 * @author Vicente Caballero Navarro

 */

public class SelectedZoomVisitor implements FeatureVisitor {

        private Rectangle2D rectangle = null;

        private FBitSet bitset = null;

        /**

         * Inicializa el visitor.

         *

         * @param layer Capa.

         *

         * @return True si se inicializa correctamente.

         */

        public boolean start(FLayer layer) throws StartVisitorException {

                if (layer instanceof AlphanumericData) {//TODO Esta comprobaci?n se hacia con Selectable

                        try {

                                bitset = ((AlphanumericData) layer).getRecordset().getSelection();

                        } catch (ReadDriverException e) {

                                e.printStackTrace();

                        }

                        return true;

                }

                return false;

        }

        /**

         * Finaliza el visitor.

         *

         * @param layer Capa.

         */

        public void stop(FLayer layer) throws VisitorException {

        }

        /**

         * @see com.iver.cit.gvsig.fmap.operations.strategies.FeatureVisitor#visit(com.iver.cit.gvsig.fmap.core.IGeometry,

         *                 int)

         */

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

                if (bitset.get(index)) {

                        if (rectangle == null) {

                                rectangle = (Rectangle2D) g.getBounds2D().clone();

                        } else {

                                rectangle.add(g.getBounds2D());

                        }

                }

        }

        /**

         * Devuelve el Extent de los shapes seleccionados, y si no hay ning?n shape

         * seleccionado devuelve null.

         *

         * @return Extent de los shapes seleccionados.

         */

        public Rectangle2D getSelectBound() {

                return rectangle;

        }

        public String getProcessDescription() {

                return "Defining rectangle to zoom from selected geometries";

        }

}