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- /*
- * 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.
- */
-
- /* $Id$ */
-
- package org.apache.fop.events;
-
- import java.util.List;
-
- /**
- * EventListener implementation forwards events to possibly multiple other EventListeners.
- */
- public class CompositeEventListener implements EventListener {
-
- private List listeners = new java.util.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);
- }
-
- private synchronized int getListenerCount() {
- return this.listeners.size();
- }
-
- /**
- * Indicates whether any listeners have been registered with the broadcaster.
- * @return true if listeners are present, false otherwise
- */
- public boolean hasEventListeners() {
- return (getListenerCount() > 0);
- }
-
- /** {@inheritDoc} */
- public synchronized void processEvent(Event event) {
- for (int i = 0, c = getListenerCount(); i < c; i++) {
- EventListener listener = (EventListener)this.listeners.get(i);
- listener.processEvent(event);
- }
- }
-
- }
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