SnmpMibTable.java 文件源码

/**
 * Enable to add an SNMP entry listener to this
 * <CODE>SnmpMibTable</CODE>.
 *
 * <p>
 * @param listener The listener object which will handle the
 *    notifications emitted by the registered MBean.
 *
 * @param filter The filter object. If filter is null, no filtering
 *    will be performed before handling notifications.
 *
 * @param handback The context to be sent to the listener when a
 *    notification is emitted.
 *
 * @exception IllegalArgumentException Listener parameter is null.
 */
@Override
public synchronized void
    addNotificationListener(NotificationListener listener,
                            NotificationFilter filter, Object handback)  {

    // Check listener
    //
    if (listener == null) {
        throw new java.lang.IllegalArgumentException
            ("Listener can't be null") ;
    }

    // looking for listener in handbackTable
    //
    Vector<Object> handbackList = handbackTable.get(listener) ;
    Vector<NotificationFilter> filterList = filterTable.get(listener) ;
    if ( handbackList == null ) {
        handbackList = new Vector<>() ;
        filterList = new Vector<>() ;
        handbackTable.put(listener, handbackList) ;
        filterTable.put(listener, filterList) ;
    }

    // Add the handback and the filter
    //
    handbackList.addElement(handback) ;
    filterList.addElement(filter) ;
}