Source for gnu.classpath.jdwp.event.filters.ThreadOnlyFilter

   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:    */
  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:    */
  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:    */
  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: }