Application: gvSIG desktop » gvSIG raster

/* gvSIG. Geographic Information System of the Valencian Government

 *

 * Copyright (C) 2007-2008 Infrastructures and Transports Department

 * of the Valencian Government (CIT)

 *

 * 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., 51 Franklin Street, Fifth Floor, Boston,

 * MA  02110-1301, USA.

 *

 */

package org.gvsig.raster.impl.buffer.cache;

import java.io.IOException;

import org.gvsig.fmap.dal.coverage.RasterLocator;

import org.gvsig.fmap.dal.coverage.datastruct.Extent;

import org.gvsig.fmap.dal.coverage.exception.NotSupportedExtensionException;

import org.gvsig.fmap.dal.coverage.exception.ProcessInterruptedException;

import org.gvsig.fmap.dal.coverage.exception.QueryException;

import org.gvsig.fmap.dal.coverage.exception.RasterDriverException;

import org.gvsig.fmap.dal.coverage.store.RasterQuery;

import org.gvsig.raster.impl.buffer.SpiRasterQuery;

import org.gvsig.raster.impl.provider.AbstractRasterProvider;

import org.gvsig.raster.impl.provider.RasterProvider;

import org.gvsig.raster.impl.store.DefaultRasterStore;

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;

/**

 * 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 Logger                          log           = LoggerFactory.getLogger(CacheDataFromDriverServer.class);

        private AbstractRasterProvider          provider      = 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(RasterProvider provider, int numPag, Extent extent) {

                if(provider instanceof AbstractRasterProvider)

                        this.provider = (AbstractRasterProvider)provider;

                pageExtent = extent;

        }

        public void loadPage(PageBandBuffer pageBuffer) throws ProcessInterruptedException {

                //Creamos un BandList con todas las bandas del fichero

                /*BandList bandList = new BandListImpl();

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

                        try {

                                DatasetBand band = new DatasetBandImpl(provider.getURIByBand(i), i, provider.getDataType()[i], provider.getBandCount());

                                bandList.addBand(band, i);

                        } catch(BandNotFoundInListException ex) {

                                //No a?adimos la banda

                        }

                }*/

                try {

                        DefaultRasterStore store = new DefaultRasterStore();

                        store.setProvider(provider);

                        RasterQuery q = RasterLocator.getManager().createQuery();

                        q.setAreaOfInterest(pageExtent, pageBuffer.getWidth(), pageBuffer.getHeight());

                        q.setAllDrawableBands();

                        q.setBufferForProviders(pageBuffer);

                        provider.getDataSet((SpiRasterQuery)q);

                        //dataset.getWindow(pageExtent, bandList, pageBuffer);

                } catch (RasterDriverException e) {

                        log.debug("Error loading the PageBandBuffer", e);

                } catch (QueryException e) {

                        log.debug("Error loading the PageBandBuffer", e);

                }

        }

        public void savePage(PageBandBuffer pageBuffer) throws IOException {

                //Read Only

        }

        public void delete() {

                //Read Only

        }

        public String getPath() {

                if(provider != null)

                        return provider.getURIOfFirstProvider().getPath();

                return null;

        }

}