75 lines
2.1 KiB
Java
75 lines
2.1 KiB
Java
/*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* $Header:$
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*/
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package org.apache.beehive.controls.runtime.bean;
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import java.util.Iterator;
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import java.util.LinkedList;
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/**
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* The EventNotifier class provides basic callback listener management and event delivery
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* services for ControlBean instances.
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*/
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public class EventNotifier implements java.io.Serializable
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{
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/**
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* Adds a new callback event listener for this EventNotifier
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*/
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synchronized public void addListener(Object listener)
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{
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_listeners.add(listener);
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}
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/**
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* Remove an existing callback event listener for this EventNotifier
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*/
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synchronized public void removeListener(Object listener)
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{
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if (!_listeners.contains(listener))
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throw new IllegalStateException("Invalid listener, not currently registered");
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_listeners.remove(listener);
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}
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/**
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* Returns an iterator over the full set of listeners
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*/
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public Iterator listenerIterator()
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{
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return _listeners.iterator();
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}
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/**
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* Returns the number of registered listeners
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*/
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public int getListenerCount()
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{
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return _listeners.size();
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}
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/**
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* Returns the listener list in array form
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*/
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public void getListeners(Object [] listeners)
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{
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_listeners.toArray(listeners);
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}
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private LinkedList _listeners = new LinkedList();
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}
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