1 //
2 // ========================================================================
3 // Copyright (c) 1995-2013 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 package org.eclipse.jetty.util.component;
20
21 import java.util.Collection;
22
23 public interface Container
24 {
25 public boolean addBean(Object o);
26
27 /**
28 * @return the list of beans known to this aggregate
29 * @see #getBean(Class)
30 */
31 public Collection<Object> getBeans();
32
33 /**
34 * @param clazz the class of the beans
35 * @return the list of beans of the given class (or subclass)
36 * @see #getBeans()
37 */
38 public <T> Collection<T> getBeans(Class<T> clazz);
39
40 /**
41 * @param clazz the class of the bean
42 * @return the first bean of a specific class (or subclass), or null if no such bean exist
43 */
44 public <T> T getBean(Class<T> clazz);
45
46 /**
47 * Removes the given bean.
48 * @return whether the bean was removed
49 * @see #removeBeans()
50 */
51 public boolean removeBean(Object o);
52
53 /**
54 * A listener for Container events.
55 * If an added bean implements this interface it will receive the events
56 * for this container.
57 */
58 public interface Listener
59 {
60 void beanAdded(Container parent,Object child);
61 void beanRemoved(Container parent,Object child);
62 }
63
64 /**
65 * Inherited Listener.
66 * If an added bean implements this interface, then it will
67 * be added to all contained beans that are themselves Containers
68 */
69 public interface InheritedListener extends Listener
70 {
71 }
72 }