/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* @author Igor V. Stolyarov
*/
package com.google.code.appengine.awt.image;
import java.util.Hashtable;
import com.google.code.appengine.awt.image.ImageConsumer;
import com.google.code.appengine.awt.image.ImageFilter;
import com.google.code.appengine.awt.image.ImageProducer;
public class FilteredImageSource implements ImageProducer {
private final ImageProducer source;
private final ImageFilter filter;
private final Hashtable<ImageConsumer, ImageConsumer> consTable = new Hashtable<ImageConsumer, ImageConsumer>();
public FilteredImageSource(ImageProducer orig, ImageFilter imgf) {
source = orig;
filter = imgf;
}
public synchronized boolean isConsumer(ImageConsumer ic) {
if(ic != null) {
return consTable.containsKey(ic);
}
return false;
}
public void startProduction(ImageConsumer ic) {
addConsumer(ic);
ImageConsumer fic = consTable.get(ic);
source.startProduction(fic);
}
public void requestTopDownLeftRightResend(ImageConsumer ic) {
if(ic != null && isConsumer(ic)){
ImageFilter fic = (ImageFilter) consTable.get(ic);
fic.resendTopDownLeftRight(source);
}
}
public synchronized void removeConsumer(ImageConsumer ic) {
if(ic != null && isConsumer(ic)){
ImageConsumer fic = consTable.get(ic);
source.removeConsumer(fic);
consTable.remove(ic);
}
}
public synchronized void addConsumer(ImageConsumer ic) {
if(ic != null && !isConsumer(ic)){
ImageConsumer fic = filter.getFilterInstance(ic);
source.addConsumer(fic);
consTable.put(ic, fic);
}
}
}