/*
* Copyright (c) 2008 Los Alamos National Security, LLC.
*
* Los Alamos National Laboratory
* Research Library
* Digital Library Research & Prototyping Team
*
* 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
package gov.lanl.adore.djatoka.io.reader;
import gov.lanl.adore.djatoka.io.FormatIOException;
import gov.lanl.adore.djatoka.io.IReader;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import javax.media.jai.RenderedImageAdapter;
import org.apache.log4j.Logger;
import com.sun.media.jai.codec.ImageCodec;
import com.sun.media.jai.codec.ImageDecoder;
/**
* Returns BufferedImage give a PNM image InputStream or file path.
* Uses JAI to open PNM formatted images.
* @author Ryan Chute
*
*/
public class PNMReader implements IReader{
static Logger logger = Logger.getLogger(PNMReader.class);
/**
* Returns a BufferedImage instance for provided image file path.
* @param input absolute file path for image file
* @return a BufferedImage instance for source image file
* @throws FormatIOException
*/
public BufferedImage open(String input) throws FormatIOException {
RenderedImageAdapter aid = null;
try {
ImageDecoder enc = ImageCodec.createImageDecoder("PNM", new File(input), null);
aid = new RenderedImageAdapter(enc.decodeAsRenderedImage());
} catch (IOException e) {
return null;
}
return aid.getAsBufferedImage();
}
/**
* Returns a BufferedImage instance for provided InputStream
* @param input an InputStream consisting of an image bitstream
* @return a BufferedImage instance for source image InputStream
* @throws FormatIOException
*/
public BufferedImage open(InputStream input) throws FormatIOException {
RenderedImageAdapter aid = null;
try {
ImageDecoder enc = ImageCodec.createImageDecoder("PNM", input, null);
aid = new RenderedImageAdapter(enc.decodeAsRenderedImage());
} catch (IOException e) {
return null;
}
return aid.getAsBufferedImage();
}
}