Source for gnu.classpath.jdwp.id.ThreadGroupId

   1: /* ThreadGroupId.java -- thread group IDs
   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.id;
  41: 
  42: import gnu.classpath.jdwp.JdwpConstants;
  43: import gnu.classpath.jdwp.exception.InvalidThreadGroupException;
  44: 
  45: /**
  46:  * A class which represents a JDWP thread group id
  47:  *
  48:  * @author Keith Seitz  <keiths@redhat.com>
  49:  */
  50: public class ThreadGroupId
  51:   extends ObjectId
  52: {
  53:   /**
  54:    * The object class that this id represents
  55:    */
  56:   public static final Class typeClass = ThreadGroup.class;
  57: 
  58:   /**
  59:    * Constructs a new <code>ThreadGroupId</code>
  60:    */
  61:   public ThreadGroupId ()
  62:   {
  63:     super (JdwpConstants.Tag.THREAD_GROUP);
  64:   }
  65: 
  66:   /**
  67:    * Gets the thread group represented by this ID
  68:    *
  69:    * @throws InvalidThreadGroupException if the group is invalid
  70:    *           or garbage collected
  71:    */
  72:   public ThreadGroup getThreadGroup ()
  73:     throws InvalidThreadGroupException
  74:   {
  75:     ThreadGroup group = (ThreadGroup) _reference.get ();
  76: 
  77:     if (group == null)
  78:       throw new InvalidThreadGroupException (getId ());
  79: 
  80:     return group;
  81:   }
  82: }