Source for gnu.classpath.jdwp.event.SingleStepEvent

   1: /* SingleStepEvent.java -- an event specifying that a single step has
   2:  compleated
   3:  Copyright (C) 2006 Free Software Foundation, Inc.
   4: 
   5:  This file is part of GNU Classpath.
   6: 
   7:  GNU Classpath is free software; you can redistribute it and/or modify
   8:  it under the terms of the GNU General Public License as published by
   9:  the Free Software Foundation; either version 2, or (at your option)
  10:  any later version.
  11: 
  12:  GNU Classpath is distributed in the hope that it will be useful, but
  13:  WITHOUT ANY WARRANTY; without even the implied warranty of
  14:  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15:  General Public License for more details.
  16: 
  17:  You should have received a copy of the GNU General Public License
  18:  along with GNU Classpath; see the file COPYING.  If not, write to the
  19:  Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  20:  02110-1301 USA.
  21: 
  22:  Linking this library statically or dynamically with other modules is
  23:  making a combined work based on this library.  Thus, the terms and
  24:  conditions of the GNU General Public License cover the whole
  25:  combination.
  26: 
  27:  As a special exception, the copyright holders of this library give you
  28:  permission to link this library with independent modules to produce an
  29:  executable, regardless of the license terms of these independent
  30:  modules, and to copy and distribute the resulting executable under
  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;
  41: 
  42: import gnu.classpath.jdwp.JdwpConstants;
  43: import gnu.classpath.jdwp.VMIdManager;
  44: import gnu.classpath.jdwp.id.ThreadId;
  45: import gnu.classpath.jdwp.util.Location;
  46: 
  47: import java.io.DataOutputStream;
  48: import java.io.IOException;
  49: 
  50: 
  51: /**
  52:  * Notification from the VM that a single step has compleated including the
  53:  * thread and location stepped to
  54:  *
  55:  * @author Kyle Galloway (kgallowa@redhat.com)
  56:  */
  57: public class SingleStepEvent
  58:     extends Event
  59: {
  60:   // the thread where the event occurred
  61:   private Thread _thread;
  62: 
  63:   // the location where the event occurred
  64:   private Location _location;
  65: 
  66:   //object instance
  67:   private Object _instance;
  68: 
  69:   /**
  70:    * Constructs a new <code>SingleStepEvent</code>
  71:    *
  72:    * @param thread the thread where the exception occurred
  73:    * @param location the location single stepped to
  74:    * @param instance the instance in which the single step occurred
  75:    */
  76:   public SingleStepEvent(Thread thread, Location location, Object instance)
  77:   {
  78:     super(JdwpConstants.EventKind.SINGLE_STEP);
  79:     _thread = thread;
  80:     _location = location;
  81:     _instance = instance;
  82:   }
  83: 
  84:   /**
  85:    * Returns a specific filtering parameter for this event. Valid types are
  86:    * thread and location
  87:    *
  88:    * @param type the type of parameter desired
  89:    * @returns the desired parameter or null
  90:    */
  91:   public Object getParameter(int type)
  92:   {
  93:     if (type == EVENT_THREAD)
  94:       return _thread;
  95:     else if (type == EVENT_LOCATION)
  96:       return _location;
  97:     else if (type == EVENT_INSTANCE)
  98:       return _instance;
  99:     else if (type == EVENT_CLASS)
 100:       return _instance.getClass();
 101: 
 102:     return null;
 103:   }
 104: 
 105:   /**
 106:    * Writes the event to the given stream
 107:    *
 108:    * @param outStream the output stream to write the event to
 109:    * @throws IOException
 110:    */
 111:   protected void _writeData(DataOutputStream outStream)
 112:     throws IOException
 113:   {
 114:     VMIdManager idm = VMIdManager.getDefault();
 115:     ThreadId tid = (ThreadId) idm.getObjectId(_thread);
 116: 
 117:     tid.write(outStream);
 118:     _location.write(outStream);
 119:   }
 120: 
 121: }