Application: gvSIG desktop » gvSIG geoprocess

/*

 * gvSIG. Sistema de Informaci?n Geogr?fica de la Generalitat Valenciana

 *

 * Copyright (C) 2010 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.

 *

 */

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

import org.cresques.cts.IProjection;

import org.gvsig.fmap.dal.exception.DataException;

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

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

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

import org.gvsig.fmap.geom.exception.CreateGeometryException;

import org.gvsig.sextante.app.algorithm.base.core.DALFeaturePersister;

import org.gvsig.sextante.app.algorithm.base.core.GeometryOperation;

import org.gvsig.sextante.app.algorithm.base.util.GeometryUtil;

import com.vividsolutions.jts.geom.Geometry;

import com.vividsolutions.jts.geom.GeometryCollection;

import es.unex.sextante.dataObjects.IVectorLayer;

/**

 * Buffer operation

 * @author <a href="mailto:nachobrodin@gmail.com">Nacho Brodin</a>

 */

public abstract class BufferOperation extends GeometryOperation {        

        public static final byte CAP_SQUARE                   = 0;

        public static final byte CAP_ROUND                    = 1;

        protected byte           capBuffer                    = CAP_ROUND;

        protected int            numberOfRadialBuffers        = 1;

        protected IDistance      distance                     = null;

        protected IVectorLayer   layer                        = null;

        protected IProjection    projection                   = null;

        protected double         userDistance                 = 0D;

        public BufferOperation(IDistance distance, IVectorLayer layer, double userDistance) {

                this.distance = distance;

                this.layer = layer;

                this.projection = (IProjection)layer.getCRS();

                this.userDistance = userDistance;

        }

        /**

         * Sets the output FeatureType

         * @param out

         * @throws DataException 

         */

        public void setFeatureStore(FeatureStore out, String[] attrNames) throws DataException {

                persister = new DALFeaturePersister(out, attrNames);

        }

        /**

         * Verifys if a geometry buffer is null.

         * It is useful when you're working with internal buffers. If the internal

         * buffer distance is greater than the geometry radius, the buffer result

         * will be null.

         *

         * @param newGeometry

         * @return

         */

        protected boolean verifyNilGeometry(Geometry newGeometry){

                if(newGeometry instanceof GeometryCollection){

                        if(((GeometryCollection)newGeometry).getNumGeometries() == 0){

                                //we have collapsed initial geometry

                                return true;

                        }

                }

                return false;

        }

        /**

         * Adds a new feature

         * @param feature

         * @param newGeom

         * @throws CreateGeometryException

         * @throws DataException

         * @deprecated No es necesario porque no hay diferencia entre las llamadas entre ambos invoke

         */

        protected void addFeature(Feature feature, Geometry newGeom) throws CreateGeometryException, DataException {

                if(!(feature instanceof EditableFeature)) 

                        lastEditFeature = persister.addFeature(feature, newGeom);

                else {

                        org.gvsig.fmap.geom.Geometry g = GeometryUtil.jtsToGeom(newGeom);

                        persister.addGeometryToExistingFeature((EditableFeature)feature, g);

                }

        }

        /**

         * Sets type of cap flag

         * @param typeOfCap

         */

        public void setTypeOfCap(byte typeOfCap) {

                capBuffer = typeOfCap;

        }

        /**

         * Sets number of radial rings buffers

         * @param number

         */

        public void setNumberOfRadialBuffers(int number) {

                numberOfRadialBuffers = number;

        }

}