/*
* $RCSfile: GZIPTileDecoder.java,v $
*
* Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
*
* Use is subject to license terms.
*
* $Revision: 1.1 $
* $Date: 2005/02/11 04:56:56 $
* $State: Exp $
*/package com.lightcrafts.media.jai.tilecodec;
import java.awt.Point;
import java.awt.RenderingHints;
import java.awt.image.Raster;
import java.io.InputStream;
import java.io.ObjectInputStream;
import java.io.IOException;
import java.util.zip.GZIPInputStream;
import com.lightcrafts.mediax.jai.tilecodec.TileDecoderImpl;
import com.lightcrafts.mediax.jai.tilecodec.TileCodecParameterList;
import com.lightcrafts.mediax.jai.util.ImagingListener;
import com.lightcrafts.media.jai.util.ImageUtil;
/**
* A concrete implementation of the <code>TileDecoderImpl</code> class
* for the gzip tile codec.
*/
public class GZIPTileDecoder extends TileDecoderImpl {
/**
* Constructs a <code>GZIPTileDecoder</code>.
* <code>GZIPTileDecoder</code> may throw a
* <code>IllegalArgumentException</code> if <code>param</code>'s
* <code>getParameterListDescriptor()</code> method does not return
* the same descriptor as that from the associated
* <code>TileCodecDescriptor</code>'s
* <code>getParameterListDescriptor</code> method for the "tileDecoder"
* registry mode.
*
* <p> If param is null, then the default parameter list for decoding
* as defined by the associated <code>TileCodecDescriptor</code>'s
* <code>getDefaultParameters()</code> method will be used for decoding.
*
* @param input The <code>InputStream</code> to decode data from.
* @param param The object containing the tile decoding parameters.
* @throws IllegalArgumentException if input is null.
* @throws IllegalArgumentException if param is not appropriate.
*/
public GZIPTileDecoder(InputStream input, TileCodecParameterList param) {
super("gzip", input, param);
}
/**
* Returns a <code>Raster</code> that contains the decoded contents
* of the <code>InputStream</code> associated with this
* <code>TileDecoder</code>.
*
* <p>This method can perform the decoding correctly only when
* <code>includesLocationInfo()</code> returns true.
*
* @throws IOException if an I/O error occurs while reading from the
* associated InputStream.
* @throws IllegalArgumentException if the associated
* TileCodecDescriptor's includesLocationInfo() returns false.
*/
public Raster decode() throws IOException{
ObjectInputStream ois
= new ObjectInputStream(new GZIPInputStream(inputStream));
try {
Object object = ois.readObject();
return TileCodecUtils.deserializeRaster(object);
}
catch (ClassNotFoundException e) {
ImagingListener listener =
ImageUtil.getImagingListener((RenderingHints)null);
listener.errorOccurred(JaiI18N.getString("ClassNotFound"),
e, this, false);
// e.printStackTrace();
return null;
}
finally {
ois.close();
}
}
public Raster decode(Point location) throws IOException{
return decode();
}
}