org.deegree.tile.persistence.geotiff.ImageReaderFactory.java Source code

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Here is the source code for org.deegree.tile.persistence.geotiff.ImageReaderFactory.java

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//$HeadURL$
/*----------------------------------------------------------------------------
 This file is part of deegree, http://deegree.org/
 Copyright (C) 2001-2010 by:
 - Department of Geography, University of Bonn -
 and
 - lat/lon GmbH -
    
 This library 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 2.1 of the License, or (at your option)
 any later version.
 This library 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 Lesser General Public License for more
 details.
 You should have received a copy of the GNU Lesser General Public License
 along with this library; if not, write to the Free Software Foundation, Inc.,
 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
    
 Contact information:
    
 lat/lon GmbH
 Aennchenstr. 19, 53177 Bonn
 Germany
 http://lat-lon.de/
    
 Department of Geography, University of Bonn
 Prof. Dr. Klaus Greve
 Postfach 1147, 53001 Bonn
 Germany
 http://www.geographie.uni-bonn.de/deegree/
    
 Occam Labs UG (haftungsbeschrnkt)
 Godesberger Allee 139, 53175 Bonn
 Germany
 http://www.occamlabs.de/
    
 e-mail: info@deegree.org
 ----------------------------------------------------------------------------*/
package org.deegree.tile.persistence.geotiff;

import static javax.imageio.ImageIO.createImageInputStream;
import static javax.imageio.ImageIO.getImageReadersBySuffix;
import it.geosolutions.imageioimpl.plugins.tiff.TIFFImageReader;

import java.io.File;
import java.util.Iterator;

import javax.imageio.ImageReader;
import javax.imageio.stream.ImageInputStream;

import org.apache.commons.pool.PoolableObjectFactory;

/**
 * <code>ImageReaderFactory</code>: an object factory for commons-pool. It should really be replaced with a better
 * solution, not using generics here (and throwing Exception) is not the way to go...
 * 
 * @author <a href="mailto:schmitz@occamlabs.de">Andreas Schmitz</a>
 * @author last edited by: $Author: mschneider $
 * 
 * @version $Revision: 31882 $, $Date: 2011-09-15 02:05:04 +0200 (Thu, 15 Sep 2011) $
 */

public class ImageReaderFactory implements PoolableObjectFactory {

    private File file;

    public ImageReaderFactory(File file) {
        this.file = file;
    }

    @Override
    public void activateObject(Object o) throws Exception {
        // nothing to do
    }

    @Override
    public void destroyObject(Object o) throws Exception {
        ImageReader reader = (ImageReader) o;
        reader.dispose();
    }

    @Override
    public Object makeObject() throws Exception {
        ImageInputStream iis = null;
        ImageReader reader = null;
        Iterator<ImageReader> readers = getImageReadersBySuffix("tiff");
        while (readers.hasNext() && !(reader instanceof TIFFImageReader)) {
            reader = readers.next();
        }
        iis = createImageInputStream(file);
        // already checked in provider
        reader.setInput(iis);
        return reader;
    }

    @Override
    public void passivateObject(Object o) throws Exception {
        // nothing to do
    }

    @Override
    public boolean validateObject(Object o) {
        // ImageReader reader = (ImageReader) o;
        // ImageInputStream iis = (ImageInputStream) reader.getInput();
        // unknown if we need something here, so far no readers have become invalid
        return true;
    }

}