1 /* ThreadOnlyFilter.java -- a thread filter
2    Copyright (C) 2005 Free Software Foundation
3 
4 This file is part of GNU Classpath.
5 
6 GNU Classpath is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
9 any later version.
10 
11 GNU Classpath is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14 General Public License for more details.
15 
16 You should have received a copy of the GNU General Public License
17 along with GNU Classpath; see the file COPYING.  If not, write to the
18 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
19 02110-1301 USA.
20 
21 Linking this library statically or dynamically with other modules is
22 making a combined work based on this library.  Thus, the terms and
23 conditions of the GNU General Public License cover the whole
24 combination.
25 
26 As a special exception, the copyright holders of this library give you
27 permission to link this library with independent modules to produce an
28 executable, regardless of the license terms of these independent
29 modules, and to copy and distribute the resulting executable under
30 terms of your choice, provided that you also meet, for each linked
31 terms of your choice, provided that you also meet, for each linked
32 independent module, the terms and conditions of the license of that
33 module.  An independent module is a module which is not derived from
34 or based on this library.  If you modify this library, you may extend
35 this exception to your version of the library, but you are not
36 obligated to do so.  If you do not wish to do so, delete this
37 exception statement from your version. */
38 
39 
40 package gnu.classpath.jdwp.event.filters;
41 
42 import gnu.classpath.jdwp.event.Event;
43 import gnu.classpath.jdwp.exception.InvalidThreadException;
44 import gnu.classpath.jdwp.id.ThreadId;
45 
46 /**
47  * An event filter which allows only events within a specific
48  * thread
49  *
50  * @author Keith Seitz  (keiths@redhat.com)
51  */
52 public class ThreadOnlyFilter
53   implements IEventFilter
54 {
55   // the thread
56   private ThreadId _tid;
57 
58   /**
59    * Constructs a new <code>ThreadOnlyFilter</code> for the given
60    * thread id
61    *
62    * @param tid  ID of the thread on which to filter
63    * @throws InvalidThreadException if the thread is not valid
64    */
ThreadOnlyFilter(ThreadId tid)65   public ThreadOnlyFilter (ThreadId tid)
66     throws InvalidThreadException
67   {
68     if (tid == null || tid.getReference().get () == null)
69       throw new InvalidThreadException (tid.getId ());
70 
71     _tid = tid;
72   }
73 
74   /**
75    * Returns the thread in which to restrict events
76    *
77    * @return the thread's ID
78    */
getThread()79   public ThreadId getThread ()
80   {
81     return _tid;
82   }
83 
84   /**
85    * Does the given event match the filter?
86    *
87    * @param event  the <code>Event</code> to scrutinize
88    */
matches(Event event)89   public boolean matches (Event event)
90   {
91     Object thread = event.getParameter (Event.EVENT_THREAD);
92     if (thread != null)
93       {
94         Thread eventThread = (Thread) thread;
95         Thread myThread = (Thread) _tid.getReference().get ();
96         return (eventThread == myThread);
97       }
98 
99     return false;
100   }
101 }
102