/**
 * Copyright 1998-2001 Sun Microsystems, Inc.
 * 
 * See the file "license.terms" for information on usage and
 * redistribution of this file, and for a DISCLAIMER OF ALL 
 * WARRANTIES.
 */
package com.sun.speech.engine;

import java.util.Collection;

import javax.speech.AudioListener;
import javax.speech.AudioManager;

/**
 * Supports the JSAPI 1.0 <code>AudioManager</code>
 * interface.  Actual JSAPI implementations might want to extend
 * or modify this implementation.
 */
public class BaseAudioManager implements AudioManager {
    /**
     * List of <code>AudioListeners</code> registered for
     * <code>AudioEvents</code> on this object.
     */
    protected Collection listeners;
    
    /** 
     * Class constructor.
     */
    public BaseAudioManager() {
        listeners = new java.util.ArrayList();
    }

    /**
     * Requests notification of <code>AudioEvents</code> from the
     * <code>AudioManager</code>.
     *
     * @param listener the listener to add
     */
    public void addAudioListener(AudioListener listener) {
        if (!listeners.contains(listener)) {
            listeners.add(listener);
        }
    }
    
    /**
     * Removes an <code>AudioListener</code> from the list of
     * <code>AudioListeners</code>.
     *
     * @param listener the listener to remove
     */
    public void removeAudioListener(AudioListener listener) {
        listeners.remove(listener);
    }
}