listenerlist.java

来自「apache推出的net包」· Java 代码 · 共 57 行

/*
 * Copyright 2001-2005 The Apache Software Foundation
 *
 * Licensed 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.
 */
package org.apache.commons.net.util;

import java.io.Serializable;
import java.util.Enumeration;
import java.util.EventListener;
import java.util.Vector;

/**
 * @author Daniel F. Savarese
 */

public class ListenerList implements Serializable
{
    private Vector __listeners;

    public ListenerList()
    {
        __listeners = new Vector();
    }

    public synchronized void addListener(EventListener listener)
    {
        __listeners.addElement(listener);
    }

    public synchronized void removeListener(EventListener listener)
    {
        __listeners.removeElement(listener);
    }

    public synchronized Enumeration getListeners()
    {
        return ((Vector)__listeners.clone()).elements();
    }

    public int getListenerCount()
    {
        return __listeners.size();
    }

}