Application: gvSIG desktop » gvSIG geoprocess

import org.cresques.cts.IProjection;

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

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;

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;

	/**

	 * 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;

	}