calleventmulticaster.java

Java SIP

/*
 * This file is part of the Java SIP library, an open source SIP library. Please see
 * http://collaboration.mitre.org/sip for more information
 * 
 * Copyright (c) 2001 The MITRE Corporation 
 * 
 *
 * This library is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Library General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or (at your
 * option) any later version.
 * 
 * This library is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Library General Public
 * License for more details.
 * 
 * You should have received a copy of the GNU Library General Public License
 * along with this library; see the file COPYING.LIB.  If not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
 * MA 02111-1307, USA.
 *
 */
/**
 * Maintains listener list for CallEvents
 *
 * @author S.R.Jones
 * @version 1
 */

package org.mitre.jsip.event;

import java.awt.AWTEventMulticaster;
import java.util.EventListener;

public class CallEventMulticaster extends AWTEventMulticaster implements CallListener
{
    protected CallEventMulticaster( EventListener a, EventListener b ) {
	super( a, b );
    }

    public static CallListener add( CallListener a, CallListener b ) {
	return (CallListener) addInternal( a, b );
    }

    public static CallListener remove( CallListener cel, CallListener cel_old ) {
	return (CallListener) removeInternal( cel, cel_old );
    }

    public void responseReceived( CallEvent ce ) {
	if ( a != null ) ( (CallListener) a ).responseReceived(ce);
	if ( b != null ) ( (CallListener) b ).responseReceived(ce);
    }

    public void requestReceived( CallEvent ce ) {
	if ( a != null ) ( (CallListener) a ).requestReceived(ce);
	if ( b != null ) ( (CallListener) b ).requestReceived(ce);
    }

    protected static EventListener addInternal( EventListener a, EventListener b ) {
	if ( a == null ) return b;
	if ( b == null ) return a;

	return new CallEventMulticaster( a, b );
    }

    protected EventListener remove( EventListener old_listener ) {
	if ( old_listener == a ) return b;
	if ( old_listener == b ) return a;

	EventListener a2 = removeInternal(a, old_listener);
	EventListener b2 = removeInternal(b, old_listener);

	if ( a2 == a && b2 == b ) return this;
	return addInternal( a2, b2 );
    }
}