1 //
2 // ========================================================================
3 // Copyright (c) 1995-2016 Mort Bay Consulting Pty. Ltd.
4 // ------------------------------------------------------------------------
5 // All rights reserved. This program and the accompanying materials
6 // are made available under the terms of the Eclipse Public License v1.0
7 // and Apache License v2.0 which accompanies this distribution.
8 //
9 // The Eclipse Public License is available at
10 // http://www.eclipse.org/legal/epl-v10.html
11 //
12 // The Apache License v2.0 is available at
13 // http://www.opensource.org/licenses/apache2.0.php
14 //
15 // You may elect to redistribute this code under either of these licenses.
16 // ========================================================================
17 //
18
19
20 package org.eclipse.jetty.servlet;
21
22 import java.util.EventListener;
23
24 /**
25 * ListenerHolder
26 *
27 * Specialization of AbstractHolder for servlet listeners. This
28 * allows us to record where the listener originated - web.xml,
29 * annotation, api etc.
30 */
31 public class ListenerHolder extends BaseHolder<EventListener>
32 {
33 private EventListener _listener;
34
35
36 public ListenerHolder(Source source)
37 {
38 super(source);
39 }
40
41
42 public void setListener(EventListener listener)
43 {
44 _listener = listener;
45 setClassName(listener.getClass().getName());
46 setHeldClass(listener.getClass());
47 _extInstance=true;
48 }
49
50 public EventListener getListener()
51 {
52 return _listener;
53 }
54
55
56 @Override
57 public void doStart() throws Exception
58 {
59 //Listeners always have an instance eagerly created, it cannot be deferred to the doStart method
60 if (_listener == null)
61 throw new IllegalStateException("No listener instance");
62
63 super.doStart();
64 }
65 }