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/* ServiceRequestConverter.java --

   Copyright (C) 2005 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.CORBA;

import gnu.CORBA.CDR.BufferedCdrOutput;

import org.omg.CORBA.ARG_IN;

import org.omg.CORBA.ARG_OUT;

import org.omg.CORBA.Any;

import org.omg.CORBA.Bounds;

import org.omg.CORBA.ServerRequest;

import org.omg.CORBA.portable.InputStream;

import org.omg.CORBA.portable.InvokeHandler;

import org.omg.CORBA.portable.OutputStream;

import org.omg.CORBA.portable.ResponseHandler;

import org.omg.CORBA.portable.Streamable;

/**

 * This class supports invocation using ServerRequest. When possible,

 * it is better to use  the {@link ObjectImpl#_invoke} rather than

 * working via ServerRequest. However since 1.4 the ServerRequest is

 * involved into POA machinery making this type of call is sometimes

 * inavoidable.

 *

 * @author Audrius Meskauskas, Lithuania (AudriusA@Bioinformatics.org)

 */

public class ServiceRequestAdapter

  implements ResponseHandler

{

  /**

   * A buffer for writing the response.

   */

  BufferedCdrOutput reply = new BufferedCdrOutput();

  /**

   * If set to true, an exception has been thrown during the invocation.

   */

  boolean isException;

  public OutputStream createExceptionReply()

  {

    isException = true;

    return reply;

  }

  public OutputStream createReply()

  {

    isException = false;

    return reply;

  }

  /**

   * Make an invocation.

   *

   * @param request a server request, containg the invocation information.

   * @param target the invocation target

   * @param result the result holder with the set suitable streamable.

   * Using this parameter only increase the performance. It can be

   * null if the return type is void or unknown.

   */

  public static void invoke(ServerRequest request, InvokeHandler target,

                            Streamable result

                           )

  {

    try

      {

        int IN = ARG_IN.value;

        int OUT = ARG_OUT.value;

        // Write all arguments to the buffer output stream.

        BufferedCdrOutput buffer = new BufferedCdrOutput();

        gnuNVList args = new gnuNVList();

        request.arguments(args);

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

          {

            if ((args.item(i).flags() & IN) != 0)

              {

                args.item(i).value().write_value(buffer);

              }

          }

        ServiceRequestAdapter h = new ServiceRequestAdapter();

        target._invoke(request.operation(), buffer.create_input_stream(), h);

        InputStream in = h.reply.create_input_stream();

        if (h.isException)

          {

            // Write the exception information

            gnuAny exc = new gnuAny();

            GeneralHolder uku = new GeneralHolder(h.reply);

            exc.insert_Streamable(uku);

            request.set_exception(exc);

          }

        else

          {

            if (result != null)

              {

                // Use the holder for the return value, if provided.

                result._read(in);

                gnuAny r = new gnuAny();

                r.insert_Streamable(result);

                request.set_result(r);

              }

            else

              {

                // Use the universal holder otherwise.

                gnuAny r = new gnuAny();

                r.insert_Streamable(new StreamHolder(in));

              }

            // Unpack the arguments

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

              {

                if ((args.item(i).flags() & OUT) != 0)

                  {

                    Any a = args.item(i).value();

                    a.read_value(in, a.type());

                  }

              }

          }

      }

    catch (Bounds ex)

      {

        throw new InternalError();

      }

  }

}