| gvSIG desktop 1

package org.gvsig.fmap.geom.operation.fromjts;

import org.gvsig.fmap.geom.Geometry;

import org.gvsig.fmap.geom.GeometryLocator;

import org.gvsig.fmap.geom.GeometryManager;

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

import org.gvsig.fmap.geom.operation.GeometryOperation;

import org.gvsig.fmap.geom.operation.GeometryOperationContext;

import org.gvsig.fmap.geom.operation.GeometryOperationException;

import org.gvsig.fmap.geom.util.Converter;

/**

 * <p>

 * Converts a geometry from JTS to DAL format. This is a special geometry operation

 * because don't use the Geometry parameter and returns a JTS geometry. This kind

 * of operation can be called from the {@link GeometryManager} using invokeOperation.

 * </p>

 * <p>

 * This operation needs a JTS geometry loaded in the context. The only attribute

 * of the {@link GeometryOperation} have to be a geometry of this type and the ID 

 * of this attribute will be JTSGeometry.

 * </p>

 * 

 * @author Nacho Brodin (nachobrodin@gmail.com)

 *

 */

public class FromJTS extends GeometryOperation {

    public static final String NAME  = "fromJTS";

    public static final String PARAM = "JTSGeometry";

        protected static GeometryManager geomManager = GeometryLocator.getGeometryManager();

    public static final int CODE = geomManager.getGeometryOperationCode(NAME);        

        protected final static com.vividsolutions.jts.geom.GeometryFactory geomFactory = new com.vividsolutions.jts.geom.GeometryFactory();

        public int getOperationIndex() {

                return CODE;

        }

        /*

         * (non-Javadoc)

         * @see org.gvsig.fmap.geom.operation.GeometryOperation#invoke(org.gvsig.fmap.geom.Geometry, org.gvsig.fmap.geom.operation.GeometryOperationContext)

         */

        public Object invoke(Geometry geom, GeometryOperationContext ctx)

                        throws GeometryOperationException {

                Object obj = ctx.getAttribute("JTSGeometry");

                if(obj instanceof com.vividsolutions.jts.geom.Geometry) {

                        try {

                                return Converter.jtsToGeometry((com.vividsolutions.jts.geom.Geometry)obj);

                        } catch (CreateGeometryException e) {

                                throw new GeometryOperationException(e); 

                        }

                }

                return null;

        }

}