| 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 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.SingleLayer;

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

/**

 * Query by Theme.

 *

 * @author Fernando Gonz?lez Cort?s

 */

public class QueryByThemeVisitor implements FeatureVisitor {

        private FLayer layer;

        private FLayer toQuery;

        private int relation;

        private FBitSet bitset = null;

        /**

         * Crea un nuevo QueryByThemeVisitor.

         *

         * @param toQuery Capa.

         * @param layer Capa.

         * @param relation Relaci?n.

         */

        public QueryByThemeVisitor(FLayer toQuery, FLayer layer, int relation) {

                this.layer = layer;

                this.toQuery = toQuery;

                this.relation = relation;

        }

        /**

         * @throws ReadDriverException

         * @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 ReadDriverException, VisitorException, ProcessVisitorException {

                Strategy s = StrategyManager.getStrategy((SingleLayer) toQuery);

                QueryByGeometryVisitor visitor = new QueryByGeometryVisitor(g, relation);

                s.process(visitor);

                bitset.or(visitor.getBitSet());

        }

        /**

         * @see com.iver.cit.gvsig.fmap.operations.strategies.FeatureVisitor#stop(com.iver.cit.gvsig.fmap.layers.FLayer)

         */

        public void stop(FLayer layer) throws VisitorException {

        }

        /**

         * @see com.iver.cit.gvsig.fmap.operations.strategies.FeatureVisitor#start(com.iver.cit.gvsig.fmap.layers.FLayer)

         */

        public boolean start(FLayer layer) throws StartVisitorException {

                bitset = new FBitSet();

                return (layer instanceof SingleLayer) &&

                (layer instanceof VectorialData);

        }

        /**

         * Devuelve un FBitSet con los ?ndices de los registros como respuesta a la

         * consulta.

         *

         * @return FBitSet con los ?ndices de los registros como respuesta a la

         *                    consulta.

         */

        public FBitSet getBitset() {

                return bitset;

        }

        public String getProcessDescription() {

                return "Selecting geometries by layer criteria";

        }

}