Application: gvSIG desktop

/**

 * gvSIG. Desktop Geographic Information System.

 *

 * Copyright (C) 2007-2013 gvSIG Association.

 *

 * 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 3

 * 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., 51 Franklin Street, Fifth Floor, Boston,

 * MA  02110-1301, USA.

 *

 * For any additional information, do not hesitate to contact us

 * at info AT gvsig.com, or visit our website www.gvsig.com.

 */

package org.gvsig.fmap.mapcontext.rendering.strategies;

import org.gvsig.fmap.dal.DataSet;

import org.gvsig.fmap.dal.feature.Feature;

import org.gvsig.fmap.dal.feature.FeatureReference;

import org.gvsig.fmap.geom.primitive.Envelope;

import org.gvsig.fmap.mapcontext.layers.FLayer;

import org.gvsig.fmap.mapcontext.layers.operations.LayersVisitor;

import org.gvsig.fmap.mapcontext.layers.operations.SingleLayer;

import org.gvsig.tools.exception.BaseException;

import org.gvsig.tools.visitor.NotSupportedOperationException;

import org.gvsig.tools.visitor.Visitable;

import org.gvsig.tools.visitor.Visitor;

/**

 * Visitor de zoom a lo seleccionado.

 *

 * @author Vicente Caballero Navarro

 */

public class SelectedZoomVisitor implements LayersVisitor, Visitor {

        private Envelope rectangle = null;

        /**

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

         * seleccionado devuelve null.

         *

         * @return Extent de los shapes seleccionados.

         */

        public Envelope getSelectBound() {

                return rectangle;

        }

        public String getProcessDescription() {

                return "Defining rectangle to zoom from selected geometries";

        }

        public void visit(Feature feature) throws BaseException {

                if (rectangle == null) {

                        rectangle = (feature.getDefaultGeometry()).getEnvelope();

                } else {

                        rectangle.add((feature.getDefaultGeometry())

                                        .getEnvelope());

                }

        }

        public void visit(FeatureReference featureRefence) throws BaseException {

                this.visit(featureRefence.getFeature());

        }

        public void visit(Object obj) throws BaseException {

                if (obj instanceof FeatureReference) {

                        this.visit((FeatureReference) obj);

                        return;

                }

                if (obj instanceof Feature) {

                        this.visit((Feature) obj);

                        return;

                }

                if (obj instanceof FLayer) {

                        this.visit((FLayer) obj);

                        return;

                }

                throw new NotSupportedOperationException(this, obj);

        }

        public void visit(FLayer layer) throws BaseException {

                if (!(layer instanceof SingleLayer)) {

                        return;

                } else if (!layer.isActive()) {

                        return;

                }

                DataSet selection = ((SingleLayer) layer).getDataStore()

                                .getSelection();

                if (selection instanceof Visitable) {

                        ((Visitable) selection).accept(this);

                }

        }

}