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/* ThreadGroupReferenceCommandSet.java -- class to implement the

   ThreadGroupReference Command Set

   Copyright (C) 2005 Free Software Foundation

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.processor;

import gnu.classpath.jdwp.JdwpConstants;

import gnu.classpath.jdwp.exception.JdwpException;

import gnu.classpath.jdwp.exception.JdwpInternalErrorException;

import gnu.classpath.jdwp.exception.NotImplementedException;

import gnu.classpath.jdwp.id.ObjectId;

import gnu.classpath.jdwp.util.JdwpString;

import java.io.DataOutputStream;

import java.io.IOException;

import java.nio.ByteBuffer;

/**

 * A class representing the ThreadGroupReference Command Set.

 *

 * @author Aaron Luchko <aluchko@redhat.com>

 */

public class ThreadGroupReferenceCommandSet

  extends CommandSet

{

  public boolean runCommand(ByteBuffer bb, DataOutputStream os, byte command)

    throws JdwpException

  {

    try

      {

        switch (command)

          {

          case JdwpConstants.CommandSet.ThreadGroupReference.NAME:

            executeName(bb, os);

            break;

          case JdwpConstants.CommandSet.ThreadGroupReference.PARENT:

            executeParent(bb, os);

            break;

          case JdwpConstants.CommandSet.ThreadGroupReference.CHILDREN:

            executeChildren(bb, os);

            break;

          default:

            throw new NotImplementedException("Command " + command +

              " not found in ThreadGroupReference Command Set.");

          }

      }

    catch (IOException ex)

      {

        // The DataOutputStream we're using isn't talking to a socket at all

        // So if we throw an IOException we're in serious trouble

        throw new JdwpInternalErrorException(ex);

      }

    return false;

  }

  private void executeName(ByteBuffer bb, DataOutputStream os)

    throws JdwpException, IOException

  {

    ObjectId oid = idMan.readObjectId(bb);

    ThreadGroup group = (ThreadGroup) oid.getObject();

    JdwpString.writeString(os, group.getName());

  }

  private void executeParent(ByteBuffer bb, DataOutputStream os)

    throws JdwpException, IOException

  {

    ObjectId oid = idMan.readObjectId(bb);

    ThreadGroup group = (ThreadGroup) oid.getObject();

    ThreadGroup parent = group.getParent();

    if (parent == null) {

        os.writeLong(0L);

    } else {

        ObjectId parentId = idMan.getObjectId(parent);

        parentId.write(os);

    }

  }

  private void executeChildren(ByteBuffer bb, DataOutputStream os)

    throws JdwpException, IOException

  {

    ObjectId oid = idMan.readObjectId(bb);

    ThreadGroup group = (ThreadGroup) oid.getObject();

    ThreadGroup jdwpGroup = Thread.currentThread().getThreadGroup();

    int numThreads = group.activeCount();

    Thread allThreads[] = new Thread[numThreads];

    group.enumerate(allThreads, false);

    // We need to loop through for the true count since some threads may have

    // been destroyed since we got activeCount so those spots in the array will

    // be null. As well we must ignore any threads that belong to jdwp

    numThreads = 0;

    for (int i = 0; i < allThreads.length; i++)

      {

        Thread thread = allThreads[i];

        if (thread == null)

          break; // No threads after this point

        if (!thread.getThreadGroup().equals(jdwpGroup))

          numThreads++;

      }

    os.writeInt(numThreads);

    for (int i = 0; i < allThreads.length; i++)

      {

        Thread thread = allThreads[i];

        if (thread == null)

          break; // No threads after this point

        if (!thread.getThreadGroup().equals(jdwpGroup))

          idMan.getObjectId(thread).write(os);

      }

    int numGroups = group.activeCount();

    ThreadGroup allGroups[] = new ThreadGroup[numGroups];

    group.enumerate(allGroups, false);

    // We need to loop through for the true count since some ThreadGroups may

    // have been destroyed since we got activeCount so those spots in the array

    // will be null. As well we must ignore any threads that belong to jdwp.

    numGroups = 0;

    for (int i = 0; i < allGroups.length; i++)

      {

        ThreadGroup tgroup = allGroups[i];

        if (tgroup == null)

          break; // No ThreadGroups after this point

        if (!tgroup.equals(jdwpGroup))

          numGroups++;

      }

    os.writeInt(numGroups);

    for (int i = 0; i < allGroups.length; i++)

      {

        ThreadGroup tgroup = allGroups[i];

        if (tgroup == null)

          break; // No ThreadGroups after this point

        if (!tgroup.equals(jdwpGroup))

          idMan.getObjectId(tgroup).write(os);

      }

  }

}