/**
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 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 Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* @author Arne Kepp, OpenGeo, Copyright 2009
*/
package org.geowebcache.filter.request;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import javax.imageio.ImageIO;
import org.geowebcache.GeoWebCacheException;
import org.geowebcache.layer.TileLayer;
public class FileRasterFilter extends RasterFilter {
String storagePath;
String fileExtension;
protected BufferedImage loadMatrix(TileLayer layer, String gridSetId, int zoomLevel)
throws IOException, GeoWebCacheException {
File fh = new File( createFilePath(gridSetId, zoomLevel) );
if(! fh.exists() || ! fh.canRead()) {
throw new GeoWebCacheException(fh.getAbsolutePath() + " does not exist or is not readable");
}
BufferedImage img = ImageIO.read(fh);
int[] widthHeight = calculateWidthHeight(layer.getGridSubset(gridSetId), zoomLevel);
if(img.getWidth() != widthHeight[0] || img.getHeight() != widthHeight[1]) {
String msg = fh.getAbsolutePath() + " has dimensions " + img.getWidth() + "," + img.getHeight()
+ ", expected " + widthHeight[0] + "," + widthHeight[1];
throw new GeoWebCacheException(msg);
}
return img;
}
private String createFilePath(String gridSetId, int zoomLevel) {
String path =
storagePath + File.separator
+ this.name + "_" + gridSetId
+ "_" + zoomLevel + "." + fileExtension;
return path;
}
public void saveMatrix(byte[] data, TileLayer layer, String gridSetId, int zoomLevel) throws IOException {
// Persist
File fh = new File(createFilePath(gridSetId, zoomLevel) );
FileOutputStream fos = new FileOutputStream(fh);
fos.write(data);
fos.close();
}
public void update(byte[] filterData, TileLayer layer, String gridSetId, int z)
throws GeoWebCacheException {
try {
saveMatrix(filterData, layer, gridSetId, z);
} catch (IOException e) {
throw new GeoWebCacheException(this.getName()
+ " encountered an error while persisting matrix, " + e.getMessage());
}
try {
super.setMatrix(layer, gridSetId, z, true);
} catch (IOException e) {
throw new GeoWebCacheException(this.getName()
+ " encountered an error while loading matrix, " + e.getMessage());
}
}
public void update(TileLayer layer, String gridSetId, int zoomStart, int zoomStop)
throws GeoWebCacheException {
throw new GeoWebCacheException("TileLayer layer, String gridSetId, int z) is not appropriate for FileRasterFilters");
}
public boolean update(TileLayer layer, String gridSetId ) {
return false;
}
}