Source for gnu.classpath.jdwp.event.ExceptionEvent

   1: /* ExceptionEvent.java -- an event specifying an exception has been thrown
   2:  Copyright (C) 2006 Free Software Foundation, Inc.
   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:  independent module, the terms and conditions of the license of that
  32:  module.  An independent module is a module which is not derived from
  33:  or based on this library.  If you modify this library, you may extend
  34:  this exception to your version of the library, but you are not
  35:  obligated to do so.  If you do not wish to do so, delete this
  36:  exception statement from your version. */
  37: 
  38: 
  39: package gnu.classpath.jdwp.event;
  40: 
  41: import gnu.classpath.jdwp.JdwpConstants;
  42: import gnu.classpath.jdwp.VMIdManager;
  43: import gnu.classpath.jdwp.id.ObjectId;
  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:  * Notification from the VM that an exception has occurred along with where it
  52:  * occurred, and if and where it was caught.
  53:  *
  54:  * @author Kyle Galloway (kgallowa@redhat.com)
  55:  */
  56: public class ExceptionEvent
  57:     extends Event
  58: {
  59:   //object instance
  60:   private Object _instance;
  61: 
  62:   // the exception thrown
  63:   private Throwable _exception;
  64: 
  65:   // the thread in which the exception occurred
  66:   private Thread _thread;
  67: 
  68:   // the location where the exception was thrown
  69:   private Location _location;
  70: 
  71:   //the location where the exception was caught
  72:   private Location _catchLocation;
  73: 
  74:   //the class where the exeption was thrown
  75:   private Class _klass;
  76: 
  77:   /**
  78:    * Constructs a new <code>ExceptionEvent</code> where the exception was
  79:    * caught.
  80:    *
  81:    * @param exception the throwable object that generated the event
  82:    * @param thread the thread where the exception occurred
  83:    * @param location the location where the exception was thrown
  84:    * @param catchLocation the location where the exception was caught
  85:    * @param instance the instance that threw the exception
  86:    */
  87:   public ExceptionEvent(Throwable exception, Thread thread, Location location,
  88:                         Location catchLocation, Class clazz, Object instance)
  89:   {
  90:     super(JdwpConstants.EventKind.EXCEPTION);
  91:     _exception = exception;
  92:     _thread = thread;
  93:     _location = location;
  94:     _catchLocation = catchLocation;
  95:     _klass = clazz;
  96:     _instance = instance;
  97:   }
  98: 
  99:   /**
 100:    * Returns a specific filtering parameter for this event. Valid types are
 101:    * thread, location, and catchLocation.
 102:    *
 103:    * @param type the type of parameter desired
 104:    * @returns the desired parameter or null
 105:    */
 106:   public Object getParameter(int type)
 107:   {
 108:     if (type == EVENT_THREAD)
 109:       return _thread;
 110:     else if (type == EVENT_LOCATION)
 111:       return _location;
 112:     else if (type == EVENT_INSTANCE)
 113:       return _instance;
 114:     else if (type == EVENT_CLASS)
 115:       return _klass;
 116:     else if (type == EVENT_EXCEPTION_CLASS)
 117:       return _exception.getClass();
 118:     else if (type == EVENT_EXCEPTION_CAUGHT)
 119:       if (_catchLocation.getMethod() != null)
 120:         return Boolean.TRUE;
 121:       else
 122:         return Boolean.FALSE;
 123: 
 124:     return null;
 125:   }
 126: 
 127:   /**
 128:    * Sets the catchLocation, used for exceptions that are caught in different
 129:    * stack frames from where they are thrown.
 130:    *
 131:    * @param catchLoc the location of the catch
 132:    */
 133:   public void setCatchLoc(Location catchLoc)
 134:   {
 135:     _catchLocation = catchLoc;
 136:   }
 137: 
 138:   /**
 139:    * Writes the event to the given stream
 140:    *
 141:    * @param outStream the output stream to write the event to
 142:    * @throws IOException
 143:    */
 144:   protected void _writeData(DataOutputStream outStream)
 145:     throws IOException
 146:   {
 147:     VMIdManager idm = VMIdManager.getDefault();
 148:     ThreadId tid = (ThreadId) idm.getObjectId(_thread);
 149:     ObjectId oid = idm.getObjectId(_exception);
 150: 
 151:     tid.write(outStream);
 152:     _location.write(outStream);
 153:     oid.writeTagged(outStream);
 154:     _catchLocation.write(outStream);
 155: 
 156:   }
 157: }