Examples of java.util.TooManyListenersException

java.util.TooManyListenersException

The TooManyListenersException Exception is used as part of the Java Event model to annotate and implement a unicast special case of a multicast Event Source.

The presence of a "throws TooManyListenersException" clause on any given concrete implementation of the normally multicast "void addXyzEventListener" event listener registration pattern is used to annotate that interface as implementing a unicast Listener special case, that is, that one and only one Listener may be registered on the particular event listener source concurrently.
@see java.util.EventObject @see java.util.EventListener @version 1.14 05/11/17 @author Laurence P. G. Cable @since JDK1.1

            throws TooManyListenersException {
        if (dgl == null) {
            return;
        }
        if (dragGestureListener != null) {
            throw new TooManyListenersException("One listener is already exist.");
        }


        dragGestureListener = dgl;
        registerListeners();
    }

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            void addRequestor(Object requestor, BeanContextServiceRevokedListener bcsrl) throws TooManyListenersException {
                BeanContextServiceRevokedListener cbcsrl = (BeanContextServiceRevokedListener)requestors.get(requestor);


                if (cbcsrl != null && !cbcsrl.equals(bcsrl))
                    throw new TooManyListenersException();


                requestors.put(requestor, bcsrl);
            }

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            void verifyRequestor(Object requestor, BeanContextServiceRevokedListener bcsrl) throws TooManyListenersException {
                BeanContextServiceRevokedListener cbcsrl = (BeanContextServiceRevokedListener)requestors.get(requestor);


                if (cbcsrl != null && !cbcsrl.equals(bcsrl))
                    throw new TooManyListenersException();
            }

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     * <code>DragGestureListener</code> has already been added.
     */


    public synchronized void addDragGestureListener(DragGestureListener dgl) throws TooManyListenersException {
        if (dragGestureListener != null)
            throw new TooManyListenersException();
        else {
            dragGestureListener = dgl;


            if (component != null) registerListeners();
        }

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        if (equals(dtl)) throw new IllegalArgumentException("DropTarget may not be its own Listener");


        if (dtListener == null)
            dtListener = dtl;
        else
            throw new TooManyListenersException();
    }

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  if (dsl == null) return;


  if (equals(dsl)) throw new IllegalArgumentException("DragSourceContext may not be its own listener");


  if (listener != null)
      throw new TooManyListenersException();
  else
      listener = dsl;
    }

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  if (equals(dtl)) throw new IllegalArgumentException("DropTarget may not be its own Listener");


  if (dtListener == null)
      dtListener = dtl;
  else
      throw new TooManyListenersException();
    }

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    public void setImportEventListener( ImportEventListener listener )
  throws TooManyListenersException
    {
  if ( _listener != null )
      throw new TooManyListenersException( Messages.message( "dsml.onlyOneListener" ) );
  _listener = listener;
    }

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     * <code>DragGestureListener</code> has already been added.
     */


    public synchronized void addDragGestureListener(DragGestureListener dgl) throws TooManyListenersException {
  if (dragGestureListener != null)
      throw new TooManyListenersException();
  else {
      dragGestureListener = dgl;


      if (component != null) registerListeners();
  }

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            void addRequestor(Object requestor, BeanContextServiceRevokedListener bcsrl) throws TooManyListenersException {
                BeanContextServiceRevokedListener cbcsrl = (BeanContextServiceRevokedListener)requestors.get(requestor);


                if (cbcsrl != null && !cbcsrl.equals(bcsrl))
                    throw new TooManyListenersException();


                requestors.put(requestor, bcsrl);
            }

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