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Java > Open Source Codes > org > ungoverned > oscar > util > BundleListenerWrapper


1 /*
2  * Oscar - An implementation of the OSGi framework.
3  * Copyright (c) 2004, Richard S. Hall
4  * All rights reserved.
5  *
6  * Redistribution and use in source and binary forms, with or without
7  * modification, are permitted provided that the following conditions
8  * are met:
9  *
10  * * Redistributions of source code must retain the above copyright
11  * notice, this list of conditions and the following disclaimer.
12  * * Redistributions in binary form must reproduce the above copyright
13  * notice, this list of conditions and the following disclaimer in
14  * the documentation and/or other materials provided with the
15  * distribution.
16  * * Neither the name of the ungoverned.org nor the names of its
17  * contributors may be used to endorse or promote products derived
18  * from this software without specific prior written permission.
19  *
20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
21  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
22  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
23  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
24  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
25  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
26  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
27  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
28  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
29  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
30  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31  *
32  * Contact: Richard S. Hall (heavy@ungoverned.org)
33  * Contributor(s):
34  *
35 **/
36 package org.ungoverned.oscar.util;
37
38 import java.security.AccessController JavaDoc;
39 import java.security.PrivilegedAction JavaDoc;
40
41 import org.osgi.framework.Bundle;
42 import org.osgi.framework.BundleEvent;
43 import org.osgi.framework.BundleListener;
44 import org.osgi.framework.SynchronousBundleListener;
45
46 public class BundleListenerWrapper extends ListenerWrapper implements BundleListener
47 {
48     public BundleListenerWrapper(Bundle bundle, BundleListener l)
49     {
50         super(bundle,
51             (l instanceof SynchronousBundleListener)
52                 ? SynchronousBundleListener.class : BundleListener.class,
53             l);
54     }
55
56     public void bundleChanged(final BundleEvent event)
57     {
58         // A bundle listener is either synchronous or asynchronous.
59 // If the bundle listener is synchronous, then deliver the
60 // event to bundles with a state of STARTING, STOPPING, or
61 // ACTIVE. If the listener is asynchronous, then deliver the
62 // event only to bundles that are STARTING or ACTIVE.
63 if (((getListenerClass() == SynchronousBundleListener.class) &&
64             ((getBundle().getState() == Bundle.STARTING) ||
65             (getBundle().getState() == Bundle.STOPPING) ||
66             (getBundle().getState() == Bundle.ACTIVE)))
67             ||
68             ((getBundle().getState() == Bundle.STARTING) ||
69             (getBundle().getState() == Bundle.ACTIVE)))
70         {
71             if (System.getSecurityManager() != null)
72             {
73                 AccessController.doPrivileged(new PrivilegedAction JavaDoc() {
74                     public Object JavaDoc run()
75                     {
76                         ((BundleListener) getListener()).bundleChanged(event);
77                         return null;
78                     }
79                 });
80             }
81             else
82             {
83                 ((BundleListener) getListener()).bundleChanged(event);
84             }
85         }
86     }
87 }
88
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