Application: gvSIG desktop

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

 *

 * Copyright (C) 2006 IVER T.I. and 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.raster.buffer.cache;

import java.io.IOException;

import org.gvsig.raster.dataset.Band;

import org.gvsig.raster.dataset.BandFoundInListException;

import org.gvsig.raster.dataset.BandList;

import org.gvsig.raster.dataset.NotSupportedExtensionException;

import org.gvsig.raster.dataset.RasterDataset;

import org.gvsig.raster.dataset.RasterDriverException;

import org.gvsig.raster.shared.Extent;

/** 

 * Servidor de datos de cach?. Esta clase es la encargada de recuperar las p?ginas

 * cuando le son solicitadas. Implementar? el interfaz ICacheDataSource, aunque esta

 * clase se encargar? de servir p?ginas de solo lectura. Las p?ginas son servidas directamente desde

 * un RasterDataset y un objeto de este tipo representa a una sola p?gina, por lo que tendr? asociado

 * el extent correspondiente al trozo de p?gina que sirve.

 * 

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

 *

 */

public class CacheDataFromDriverServer implements ICacheDataSource{

        private int                                        numPag = -1;

        private RasterDataset                        dataset = null;

        private Extent                                        pageExtent = null; 

        /**

         * Constructor. 

         * Crea el identificador para todos los trozos de cach? que se guardar?n en disco. 

         * @param id Identificador de fichero. Si este es null se calcula uno autom?ticamente

         * @param numBand N?mero de banda

         * @param numPag N?mero de p?gina

         * @throws RasterDriverException 

         * @throws NotSupportedExtensionException 

         */

        public CacheDataFromDriverServer(RasterDataset dataset, int numPag, Extent extent) {

                this.numPag = numPag;

                this.dataset = dataset;

                pageExtent = extent;

        }

        /* (non-Javadoc)

         * @see org.gvsig.fmap.dataaccess.cache.ICacheDataSource#loadPage(int, org.gvsig.fmap.dataaccess.cache.PageBuffer)

         */

        public void loadPage(PageBandBuffer pageBuffer) {

                //Creamos un BandList con todas las bandas del fichero

                BandList bandList = new BandList();

                for(int i = 0; i < dataset.getBandCount();i++){

                        try{

                                Band band = new Band(dataset.getFName(), i, dataset.getDataType());

                                bandList.addBand(band, i);

                        }catch(BandFoundInListException ex){

                                //No a?adimos la banda

                        }

                }

                dataset.getWindowRaster(pageExtent.getMin().getX(), pageExtent.getMax().getY(), pageExtent.width(), pageExtent.height(), bandList, pageBuffer, true);

        }

        /* (non-Javadoc)

         * @see org.gvsig.fmap.dataaccess.cache.ICacheDataSource#savePage(int, org.gvsig.fmap.dataaccess.cache.PageBuffer)

         */

        public void savePage(PageBandBuffer pageBuffer) throws IOException {

                //Read Only                

        }

        /*

         * (non-Javadoc)

         * @see org.gvsig.raster.dataaccess.cache.ICacheDataSource#delete()

         */

        public void delete() {

                //Read Only

        }

        /*

         *  (non-Javadoc)

         * @see org.gvsig.raster.dataaccess.cache.ICacheDataSource#getPath()

         */

        public String getPath() {

                if(dataset != null)

                        return dataset.getFName();

                return null;

        }

}