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Apache FOP (Formatting Objects Processor) is the world's first print formatter driven by XSL formatting objects (XSL-FO) and the world's first output independent formatter. It is a Java application that reads a formatting object (FO) tree and renders the resulting pages to a specified output. Output formats currently supported include PDF, PCL, PS, AFP, TIFF, PNG, SVG, XML (area tree representation), Print, AWT and TXT. The primary output target is PDF.
/*
* 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.
*/
/* $Id: CompositeEventListener.java 1734671 2016-03-12 05:39:53Z gadams $ */
package org.apache.fop.events;
import java.util.ArrayList;
import java.util.List;
/**
* EventListener implementation forwards events to possibly multiple other EventListeners.
*/
public class CompositeEventListener implements EventListener {
private List listeners = new ArrayList();
/**
* Adds an event listener to the broadcaster. It is appended to the list of previously
* registered listeners (the order of registration defines the calling order).
* @param listener the listener to be added
*/
public synchronized void addEventListener(EventListener listener) {
this.listeners.add(listener);
}
/**
* Removes an event listener from the broadcaster. If the event listener is not registered,
* nothing happens.
* @param listener the listener to be removed
*/
public synchronized void removeEventListener(EventListener listener) {
this.listeners.remove(listener);
}
/**
* Indicates whether any listeners have been registered with the broadcaster.
* @return true if listeners are present, false otherwise
*/
public synchronized boolean hasEventListeners() {
return !listeners.isEmpty();
}
/** {@inheritDoc } */
public synchronized void processEvent(Event event) {
for (EventListener listener : listeners) {
listener.processEvent(event);
}
}
}