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/* SingleStepEvent.java -- an event specifying that a single step has

 compleated

 Copyright (C) 2006 Free Software Foundation, Inc.

 This file is part of GNU Classpath.

 GNU Classpath is free software; you can redistribute it and/or modify

 it under the terms of the GNU General Public License as published by

 the Free Software Foundation; either version 2, or (at your option)

 any later version.

 GNU Classpath is distributed in the hope that it will be useful, but

 WITHOUT ANY WARRANTY; without even the implied warranty of

 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

 General Public License for more details.

 You should have received a copy of the GNU General Public License

 along with GNU Classpath; see the file COPYING.  If not, write to the

 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA

 02110-1301 USA.

 Linking this library statically or dynamically with other modules is

 making a combined work based on this library.  Thus, the terms and

 conditions of the GNU General Public License cover the whole

 combination.

 As a special exception, the copyright holders of this library give you

 permission to link this library with independent modules to produce an

 executable, regardless of the license terms of these independent

 modules, and to copy and distribute the resulting executable under

 terms of your choice, provided that you also meet, for each linked

 independent module, the terms and conditions of the license of that

 module.  An independent module is a module which is not derived from

 or based on this library.  If you modify this library, you may extend

 this exception to your version of the library, but you are not

 obligated to do so.  If you do not wish to do so, delete this

 exception statement from your version. */

package gnu.classpath.jdwp.event;

import gnu.classpath.jdwp.JdwpConstants;

import gnu.classpath.jdwp.VMIdManager;

import gnu.classpath.jdwp.id.ThreadId;

import gnu.classpath.jdwp.util.Location;

import java.io.DataOutputStream;

import java.io.IOException;

/**

 * Notification from the VM that a single step has compleated including the

 * thread and location stepped to

 *

 * @author Kyle Galloway (kgallowa@redhat.com)

 */

public class SingleStepEvent

    extends Event

{

  // the thread where the event occurred

  private Thread _thread;

  // the location where the event occurred

  private Location _location;

  //object instance

  private Object _instance;

  /**

   * Constructs a new <code>SingleStepEvent</code>

   *

   * @param thread the thread where the exception occurred

   * @param location the location single stepped to

   * @param instance the instance in which the single step occurred

   */

  public SingleStepEvent(Thread thread, Location location, Object instance)

  {

    super(JdwpConstants.EventKind.SINGLE_STEP);

    _thread = thread;

    _location = location;

    _instance = instance;

  }

  /**

   * Returns a specific filtering parameter for this event. Valid types are

   * thread and location

   *

   * @param type the type of parameter desired

   * @returns the desired parameter or null

   */

  public Object getParameter(int type)

  {

    if (type == EVENT_THREAD)

      return _thread;

    else if (type == EVENT_LOCATION)

      return _location;

    else if (type == EVENT_INSTANCE)

      return _instance;

    else if (type == EVENT_CLASS)

      return _instance.getClass();

    return null;

  }

  /**

   * Writes the event to the given stream

   *

   * @param outStream the output stream to write the event to

   * @throws IOException

   */

  protected void _writeData(DataOutputStream outStream)

    throws IOException

  {

    VMIdManager idm = VMIdManager.getDefault();

    ThreadId tid = (ThreadId) idm.getObjectId(_thread);

    tid.write(outStream);

    _location.write(outStream);

  }

}