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/**********************************************************************

 * $Id: OGRLayer.java 970 2005-01-13 12:52:33Z igbrotru $

 *

 * Name:     OGRLayer.java

 * Project:  JGDAL. Interface java to gdal (Frank Warmerdam).

 * Purpose:   

 * Author:   Nacho Brodin, brodin_ign@gva.es

 *

 **********************************************************************/

/*Copyright (C) 2004  Nacho Brodin <brodin_ign@gva.es>

 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 es.gva.cit.jogr;

/** 

 * 

 * @author Nacho Brodin <brodin_ign@gva.es>.<BR> Equipo de desarrollo gvSIG.<BR> http://www.gvsig.gva.es

 * @version 0.0

 * @link http://www.gvsig.gva.es

 */

public class OGRLayer extends JNIBase{

        public native long getLayerDefnNat(long cPtr);

        public native void resetReadingNat(long cPtr);

        public native int getExtentNat(long cPtr, OGREnvelope extent, boolean bForce);

        private native void FreeOGRLayerNat(long cPtr);

        private native long getNextFeatureNat(long cPtr);

        /**

         * Constructor

         * @param cPtr        direcci?n de memoria al objeto OGRLayer de C. 

         */

        public OGRLayer(long cPtr){

                this.cPtr=cPtr;

        }

         /**

         * 

         * @throws OGRException

         * @return 

         */

         public OGRFeatureDefn getLayerDefn()throws OGRException{

                 if(cPtr <= 0)

                        throw new OGRException("Error en getLayerDefn(). El constructor no tuvo exito");

                long layer = getLayerDefnNat(cPtr);

                if(layer<=0)

                        throw new OGRException("Error en getLayerDefn(). No se ha podido obtener el objeto OGRFeatureDefn.");

                return new OGRFeatureDefn(layer);

         }

         /**

          * 

          */

         public void resetReading()throws OGRException{

                 if(cPtr <= 0)

                        throw new OGRException("Error en resetReading(). El constructor no tuvo exito");

                 resetReadingNat(cPtr);

         }

         /**

         * Obtiene el n?mero de caracteristicas

         * @throws OGRException

         * @return N?mero de caracteristicas

         */

         public int getFeatureCount()throws OGRException{

                String msg1="Error en getFeatureCount. El constructor no tuvo exito.";

                String msg2="Error en el conteo de caracteristicas.";

                return baseSimpleFunctions(2,msg1,msg2);

         }

         /**

          * Obtiene el extent de la capa

          * @throws OGRException

          * @return objeto conteniendo el extent 

          */

         public OGREnvelope getExtent(boolean bForce)throws OGRException{

                 if(cPtr <= 0)

                        throw new OGRException("Error en getExtent(). El constructor no tuvo exito");

                 OGREnvelope extent = new OGREnvelope();

                 int err;

                 err = getExtentNat(cPtr, extent, bForce);

                 if(err!=0)

                         lanzarExcepcion(err,"Error em getFeatureCount()");

                 return extent;

         }

         /**

          * 

          */

         public OGRFeature getNextFeature()throws OGRException{

                 OGRFeature feature = null;

                 if(cPtr <= 0)

                        throw new OGRException("Error en getNextFeature(). El constructor no tuvo exito");

                 long ptro_feat = getNextFeatureNat(cPtr);

                 if(ptro_feat >=0)

                         feature = new OGRFeature(ptro_feat);

                 return feature;

         }

         /**

         * Destructor 

         */

         protected void finalize(){

                if(cPtr > 0)

                        FreeOGRLayerNat(cPtr);

         }

}