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/* ObjectReferenceCommandSet.java -- class to implement the ObjectReference

   Command Set

   Copyright (C) 2005, 2007 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.VMMethod;

import gnu.classpath.jdwp.VMVirtualMachine;

import gnu.classpath.jdwp.exception.InvalidFieldException;

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.id.ReferenceTypeId;

import gnu.classpath.jdwp.util.MethodResult;

import gnu.classpath.jdwp.util.MonitorInfo;

import gnu.classpath.jdwp.value.Value;

import gnu.classpath.jdwp.value.ValueFactory;

import java.io.DataOutputStream;

import java.io.IOException;

import java.lang.reflect.Field;

import java.nio.ByteBuffer;

/**

 * A class representing the ObjectReference Command Set.

 *

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

 */

public class ObjectReferenceCommandSet

  extends CommandSet

{

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

    throws JdwpException

  {

    try

      {

        switch (command)

          {

          case JdwpConstants.CommandSet.ObjectReference.REFERENCE_TYPE:

            executeReferenceType(bb, os);

            break;

          case JdwpConstants.CommandSet.ObjectReference.GET_VALUES:

            executeGetValues(bb, os);

            break;

          case JdwpConstants.CommandSet.ObjectReference.SET_VALUES:

            executeSetValues(bb, os);

            break;

          case JdwpConstants.CommandSet.ObjectReference.MONITOR_INFO:

            executeMonitorInfo(bb, os);

            break;

          case JdwpConstants.CommandSet.ObjectReference.INVOKE_METHOD:

            executeInvokeMethod(bb, os);

            break;

          case JdwpConstants.CommandSet.ObjectReference.DISABLE_COLLECTION:

            executeDisableCollection(bb, os);

            break;

          case JdwpConstants.CommandSet.ObjectReference.ENABLE_COLLECTION:

            executeEnableCollection(bb, os);

            break;

          case JdwpConstants.CommandSet.ObjectReference.IS_COLLECTED:

            executeIsCollected(bb, os);

            break;

          default:

            throw new NotImplementedException("Command " + command +

              " not found in ObjectReference 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 executeReferenceType(ByteBuffer bb, DataOutputStream os)

    throws JdwpException, IOException

  {

    ObjectId oid = idMan.readObjectId(bb);

    Object obj = oid.getObject();

    Class clazz = obj.getClass();

    ReferenceTypeId refId = idMan.getReferenceTypeId(clazz);

    refId.writeTagged(os);

  }

  private void executeGetValues(ByteBuffer bb, DataOutputStream os)

    throws JdwpException, IOException

  {

    ObjectId oid = idMan.readObjectId(bb);

    Object obj = oid.getObject();

    int numFields = bb.getInt();

    os.writeInt(numFields); // Looks pointless but this is the protocol

    for (int i = 0; i < numFields; i++)

      {

        Field field = (Field) idMan.readObjectId(bb).getObject();

        try

          {

            field.setAccessible(true); // Might be a private field

            Object value = field.get(obj);

            Value val = ValueFactory.createFromObject(value,

                                                      field.getType());

            val.writeTagged(os);

          }

        catch (IllegalArgumentException ex)

          {

            // I suppose this would best qualify as an invalid field then

            throw new InvalidFieldException(ex);

          }

        catch (IllegalAccessException ex)

          {

            // Since we set it as accessible this really shouldn't happen

            throw new JdwpInternalErrorException(ex);

          }

      }

  }

  private void executeSetValues(ByteBuffer bb, DataOutputStream os)

    throws JdwpException, IOException

  {

    ObjectId oid = idMan.readObjectId(bb);

    Object obj = oid.getObject();

    int numFields = bb.getInt();

    for (int i = 0; i < numFields; i++)

      {

        Field field = (Field) idMan.readObjectId(bb).getObject();

        Object value = Value.getUntaggedObject(bb, field.getType());

        try

          {

            field.setAccessible(true); // Might be a private field

            field.set(obj, value);

          }

        catch (IllegalArgumentException ex)

          {

            // I suppose this would best qualify as an invalid field then

            throw new InvalidFieldException(ex);

          }

        catch (IllegalAccessException ex)

          {

            // Since we set it as accessible this really shouldn't happen

            throw new JdwpInternalErrorException(ex);

          }

      }

  }

  private void executeMonitorInfo(ByteBuffer bb, DataOutputStream os)

    throws JdwpException, IOException

  {

    if (!VMVirtualMachine.canGetMonitorInfo)

      {

        String msg = "getting monitor info not supported";

        throw new NotImplementedException(msg);

      }

    ObjectId oid = idMan.readObjectId(bb);

    Object obj = oid.getObject();

    MonitorInfo info = VMVirtualMachine.getMonitorInfo(obj);

    info.write(os);

  }

  private void executeInvokeMethod(ByteBuffer bb, DataOutputStream os)

    throws JdwpException, IOException

  {

    ObjectId oid = idMan.readObjectId(bb);

    Object obj = oid.getObject();

    ObjectId tid = idMan.readObjectId(bb);

    Thread thread = (Thread) tid.getObject();

    ReferenceTypeId rid = idMan.readReferenceTypeId(bb);

    Class clazz = rid.getType();

    VMMethod method = VMMethod.readId(clazz, bb);

    int args = bb.getInt();

    Value[] values = new Value[args];

    for (int i = 0; i < args; i++)

      values[i] = ValueFactory.createFromTagged(bb);

    int invokeOptions = bb.getInt();

    MethodResult mr = VMVirtualMachine.executeMethod(obj, thread,

                                                     clazz, method,

                                                     values, invokeOptions);

    Throwable exception = mr.getThrownException();

    ObjectId eId = idMan.getObjectId(exception);

    mr.getReturnedValue().writeTagged(os);

    eId.writeTagged(os);

  }

  private void executeDisableCollection(ByteBuffer bb, DataOutputStream os)

    throws JdwpException, IOException

  {

    ObjectId oid = idMan.readObjectId(bb);

    oid.disableCollection();

  }

  private void executeEnableCollection(ByteBuffer bb, DataOutputStream os)

    throws JdwpException, IOException

  {

    ObjectId oid = idMan.readObjectId(bb);

    oid.enableCollection();

  }

  private void executeIsCollected(ByteBuffer bb, DataOutputStream os)

    throws JdwpException, IOException

  {

    ObjectId oid = idMan.readObjectId(bb);

    boolean collected = (oid.getReference().get () == null);

    os.writeBoolean(collected);

  }

}