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.cache.tile.impl;

import java.io.File;

import java.io.IOException;

import java.util.ArrayList;

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

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

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

import org.gvsig.raster.cache.tile.disk.ITileFileSystemStrategy;

import org.gvsig.raster.cache.tile.impl.layer.TiledLayerImpl;

import org.gvsig.raster.cache.tile.layer.TiledLayer;

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

/**

 * Main implementation for the tile cache

 *

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

 */

public class TileCacheImpl implements TileCache {

        private ArrayList<TiledLayerImpl>   layerList            = null;

        //private MemoryManager               memoryManager        = null;

        private String                      baseDir              = null;

        private double                      currentSize          = 0;

        protected String                    preffixSizeFileName  = "c_len";

        protected String                    configDir            = ".metadata";

        public TileCacheImpl(String baseDir) {

                this.layerList = new ArrayList<TiledLayerImpl>();

                //memoryManager = new MemoryManager();

                this.baseDir = baseDir;

                loadSize();

        }

        public void updateBaseDirectory(String dir) {

                this.baseDir = dir;

                for (int i = 0; i < layerList.size(); i++) {

                        layerList.get(i).updateBaseDirectory(dir);

                }

        }

        /**

         * Updates the size of the tiles downloaded

         * @param sizeBytes

         */

        public synchronized void updateSize(long sizeBytes) {

                currentSize +=  ((double)sizeBytes);

        }

        /**

         * Loads the size of the directory

         */

        private void loadSize() {

                File f = new File(baseDir + File.separator + configDir);

                if(!f.exists()) {

                        f.mkdirs();

                        saveSize();

                }

                String[] list = f.list();

                for (int i = 0; i < list.length; i++) {

                        if(list[i].startsWith(preffixSizeFileName)) {

                                String s = list[i].substring(5, list[i].length());

                                try {

                                        currentSize = Double.valueOf(s);

                                } catch (NumberFormatException e) {

                                }

                        }

                }

        }

        /**

         * Saves a size file

         * @throws IOException

         */

        public synchronized void saveSize() {

                String dir = baseDir + File.separator + configDir;

                File f = new File(dir);

                if(!f.exists()) {

                        f.mkdirs();

                }

                String[] list = f.list();

                if(list != null) {

                        for (int i = 0; i < list.length; i++) {

                                if(list[i].startsWith(preffixSizeFileName)) {

                                        new File(dir + File.separator + list[i]).delete();

                                }

                        }

                }

                try {

                        new File(dir + File.separator + preffixSizeFileName + (int)currentSize).createNewFile();

                } catch (IOException e) {

                }

        }

        public boolean isFullDiskCache() {

                return currentSize >= (TileCacheLibrary.MAX_CACHE_SIZE *  1048576);

        }

        public TiledLayer createLayer(TileServer provider, String strategyType) {

                ITileFileSystemStrategy strat = ((DefaultTileCacheManager)TileCacheLocator.getManager()).createStrategy(strategyType);

                TiledLayerImpl l = new TiledLayerImpl(this, provider, strat/*, memoryManager.createLRUTileCache()*/);

                layerList.add(l);

                return l;

        }

        /**

         * Gets the base directory

         * @return

         */

        public String getBaseDirectory() {

                return baseDir;

        }

        public String getConfigurationDirectory() {

                return configDir;

        }

        public void removeLayer(TiledLayer layer) {

                layerList.remove(layer);

                updateSize(-layer.delete());

                saveSize();

        }

}