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/* FilteredImageSource.java -- Java class for providing image data
Copyright (C) 1999 Free Software Foundation, Inc.
This file is part of the non-peer AWT libraries of GNU Classpath.
This library is free software; you can redistribute it and/or modify
it under the terms of the GNU Library General Public License as published
by the Free Software Foundation, either version 2 of the License, or
(at your option) any later verion.
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 Library General Public License for more details.
You should have received a copy of the GNU Library 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. */
package java.awt.image;
import java.util.Hashtable;
/**
*
* @see ImageConsumer
* @author C. Brian Jones (cbj@gnu.org)
*/
public class FilteredImageSource implements ImageProducer
{
ImageProducer ip;
ImageFilter filter;
Hashtable consumers = new Hashtable();
/**
* The given filter is applied to the given image producer
* to create a new image producer.
*/
public FilteredImageSource(ImageProducer ip, ImageFilter filter) {
this.ip = ip;
this.filter = filter;
}
/**
* Used to register an <code>ImageConsumer</code> with this
* <code>ImageProducer</code>.
*/
public synchronized void addConsumer(ImageConsumer ic) {
if (consumers.containsKey(ic))
return;
ImageFilter f = filter.getFilterInstance(ic);
consumers.put(ic, f);
ip.addConsumer(f);
}
/**
* Used to determine if the given <code>ImageConsumer</code> is
* already registered with this <code>ImageProducer</code>.
*/
public synchronized boolean isConsumer(ImageConsumer ic) {
ImageFilter f = (ImageFilter)consumers.get(ic);
if (f != null)
return ip.isConsumer(f);
return false;
}
/**
* Used to remove an <code>ImageConsumer</code> from the list of
* registered consumers for this <code>ImageProducer</code>.
*/
public synchronized void removeConsumer(ImageConsumer ic) {
ImageFilter f = (ImageFilter)consumers.remove(ic);
if (f != null)
ip.removeConsumer(f);
}
/**
* Used to register an <code>ImageConsumer</code> with this
* <code>ImageProducer</code> and then immediately start
* reconstruction of the image data to be delivered to all
* registered consumers.
*/
public void startProduction(ImageConsumer ic) {
ImageFilter f;
if (!(consumers.containsKey(ic))) {
f = filter.getFilterInstance(ic);
consumers.put(ic, f);
ip.addConsumer(f);
} else {
f = (ImageFilter)consumers.get( ic );
}
ip.startProduction(f);
}
/**
* Used to register an <code>ImageConsumer</code> with this
* <code>ImageProducer</code> and then request that this producer
* resend the image data in the order top-down, left-right.
*/
public void requestTopDownLeftRightResend(ImageConsumer ic) {
ImageFilter f = (ImageFilter)consumers.get(ic);
ip.requestTopDownLeftRightResend(f);
}
}
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