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.provider.tile;

import org.cresques.cts.IProjection;

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

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

import org.gvsig.raster.cache.tile.TileCacheLibrary;

import org.gvsig.raster.cache.tile.TileCacheLocator;

import org.gvsig.raster.cache.tile.TileCacheManager;

import org.gvsig.raster.cache.tile.provider.CacheStruct;

import org.gvsig.raster.cache.tile.provider.Downloader;

import org.gvsig.raster.cache.tile.provider.TileServer;

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

/** 

* Data server for the tile cache in a GdalProvider 

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

*/

public class FileTileServer implements TileServer {

        private CacheStruct                struct         = null;

        private Downloader                 downloader     = null;

        private DefaultRasterProvider      provider       = null;

        private String                     suffix         = "tif";

        private boolean                    externalStruct = false;

        public FileTileServer(DefaultRasterProvider prov) {

                this.provider = prov;

        }

        /*

         * (non-Javadoc)

         * @see org.gvsig.raster.cache.tile.provider.TileServer#getDownloader()

         */

        public Downloader getDownloader() {

                //The downloader is built the first time or if the structure is assigned from the client. 

                boolean firstLoad = (downloader == null);

                if(firstLoad || externalStruct) {

                        downloader = new TileDownloaderForFiles(provider, getStruct(), 

                                        getStruct().getTileSizeByLevel(0)[0], 

                                        getStruct().getTileSizeByLevel(0)[1], 

                                        getFileSuffix());

                        externalStruct = false;

                        return downloader;

                }

                //If the tile size has changed. 

                if(((TileDownloaderForFiles)downloader).getTileSize()[0] != TileCacheLibrary.DEFAULT_TILEWIDTH ||

                   ((TileDownloaderForFiles)downloader).getTileSize()[1] != TileCacheLibrary.DEFAULT_TILEHEIGHT) {

                        downloader = new TileDownloaderForFiles(provider, getStruct(), 

                                        TileCacheLibrary.DEFAULT_TILEWIDTH, 

                                        TileCacheLibrary.DEFAULT_TILEHEIGHT, 

                                        getFileSuffix());

                }

                return downloader;

        }

        public CacheStruct getStruct() {

                if(struct == null) {

                        TileCacheManager  manager = TileCacheLocator.getManager();

                        int coordinates = CacheStruct.FLAT;

                        if(provider.getProjection() != null)

                                coordinates = (provider.getProjection() != null && provider.getProjection().isProjected()) ? CacheStruct.FLAT : CacheStruct.GEOGRAFIC;

                        else {

                                Extent e = provider.getExtent();

                                if(e.getULX() >= -180 && e.getULX() <= 180 && e.getLRX() >= -180 && e.getLRX() <= 180 && 

                                        e.getULY() >= -90 && e.getULY() <= 90 && e.getLRY() >= -90 && e.getLRY() <= 90) {

                                        coordinates = CacheStruct.GEOGRAFIC;

                                }

                        }

                        String epsg = null;

                        IProjection proj = provider.getProjection();

                        if(proj != null)

                                epsg = proj.getAbrev();

                        struct = manager.createCacheStructure(coordinates, 

                                        TileCacheLibrary.DEFAULT_LEVELS, 

                                        provider.getExtent().toRectangle2D(), 

                                        provider.getCellSize(), 

                                        TileCacheLibrary.DEFAULT_TILEWIDTH, 

                                        TileCacheLibrary.DEFAULT_TILEHEIGHT,

                                        provider.getURIOfFirstProvider(),

                                        TileCacheLibrary.DEFAULT_STRUCTURE,

                                        RasterLibrary.pathTileCache,

                                        getFileSuffix(),

                                        epsg,

                                        provider.getFileSize());

                }

                return struct;

        }

        /*

         * (non-Javadoc)

         * @see org.gvsig.raster.cache.tile.provider.TileServer#setStruct(org.gvsig.raster.cache.tile.provider.CacheStruct)

         */

        public void setStruct(CacheStruct struct) {

                if(struct != null) {

                        this.struct = struct;

                        if(struct.getTileSizeByLevel(0) != null) {

                                downloader = new TileDownloaderForFiles(provider, 

                                                struct, 

                                                struct.getTileSizeByLevel(0)[0], 

                                                struct.getTileSizeByLevel(0)[1], 

                                                getFileSuffix());

                                externalStruct = true;

                        }

                }

        }

        /*

         * (non-Javadoc)

         * @see org.gvsig.raster.cache.tile.provider.TileServer#getFileExtension()

         */

        public String getFileSuffix() {

                return suffix;

        }

        /*

         * (non-Javadoc)

         * @see org.gvsig.raster.cache.tile.provider.TileServer#setFileSuffix(java.lang.String)

         */

        public void setFileSuffix(String extension) {

                this.suffix = extension;

        }

}