/*
* $RCSfile: URLRIF.java,v $
*
* Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
*
* Use is subject to license terms.
*
* $Revision: 1.1 $
* $Date: 2005/02/11 04:56:46 $
* $State: Exp $
*/
package com.lightcrafts.media.jai.opimage;
import java.awt.RenderingHints;
import java.awt.image.RenderedImage;
import java.awt.image.renderable.ParameterBlock;
import java.awt.image.renderable.RenderedImageFactory;
import java.io.InputStream;
import java.io.IOException;
import java.net.URL;
import com.lightcrafts.mediax.jai.JAI;
import com.lightcrafts.mediax.jai.OperationRegistry;
import com.lightcrafts.mediax.jai.OpImage;
import com.lightcrafts.mediax.jai.registry.RIFRegistry;
import com.lightcrafts.mediax.jai.util.ImagingListener;
import com.lightcrafts.media.jai.codec.ImageDecodeParam;
import com.lightcrafts.media.jai.codec.SeekableStream;
import com.lightcrafts.media.jai.util.ImageUtil;
/**
* @see com.lightcrafts.mediax.jai.operator.URLDescriptor
*
* @since EA4
*
*/
public class URLRIF implements RenderedImageFactory {
/** Constructor. */
public URLRIF() {}
/**
* Creates an image from a URL.
*/
public RenderedImage create(ParameterBlock paramBlock,
RenderingHints renderHints) {
try {
// Create a SeekableStream from the URL (first parameter).
URL url = (URL)paramBlock.getObjectParameter(0);
InputStream stream = url.openStream();
SeekableStream src = SeekableStream.wrapInputStream(stream, true);
ImageDecodeParam param = null;
if (paramBlock.getNumParameters() > 1) {
param = (ImageDecodeParam)paramBlock.getObjectParameter(1);
}
ParameterBlock newParamBlock = new ParameterBlock();
newParamBlock.add(src);
newParamBlock.add(param);
RenderingHints.Key key = JAI.KEY_OPERATION_BOUND;
int bound = OpImage.OP_NETWORK_BOUND;
if (renderHints == null) {
renderHints = new RenderingHints(key, new Integer(bound));
} else if (!renderHints.containsKey(key)) {
renderHints.put(key, new Integer(bound));
}
// Get the registry from the hints, if any.
// Don't check for null hints as it cannot be null here.
OperationRegistry registry =
(OperationRegistry)renderHints.get(JAI.KEY_OPERATION_REGISTRY);
// Create the image using the most preferred RIF for "stream".
RenderedImage image =
RIFRegistry.create(registry, "stream", newParamBlock, renderHints);
// NB: StreamImage is defined in FileLoadRIF.java.
return image == null ? null : new StreamImage(image, src);
} catch (IOException e) {
ImagingListener listener =
ImageUtil.getImagingListener(renderHints);
String message = JaiI18N.getString("URLRIF0");
listener.errorOccurred(message, e, this, false);
// e.printStackTrace();
return null;
}
}
}