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/* EmptyStructHolder.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 org.omg.CORBA.BAD_OPERATION;

import org.omg.CORBA.NO_IMPLEMENT;

import org.omg.CORBA.TypeCode;

import org.omg.CORBA.UNKNOWN;

import org.omg.CORBA.UnknownUserException;

import org.omg.CORBA.portable.InputStream;

import org.omg.CORBA.portable.OutputStream;

import org.omg.CORBA.portable.Streamable;

/**

 * This holder can store any CORBA exception that has no user defined fields.

 * Only the repository ID is written when the method {@link #_write} is called.

 * The _read method is not supported for this holder.

 *

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

 */

public class EmptyExceptionHolder

  implements Streamable

{

  /**

   * The wrapped exception.

   */

  public Throwable value;

  /**

   * The typecode of the wrapped exception.

   */

  public TypeCode typecode;

  /**

   * Create the exception holder, initialised to the given values.

   *

   * @param an_exception the wrapped exception.

   * @param an_id the exception repository id.

   */

  public EmptyExceptionHolder(Throwable an_exception, TypeCode a_typecode)

  {

    value = an_exception;

    typecode = a_typecode;

  }

  /**

   * Reads the exception from the input stream.

   *

   * The value field obtains the value of either the read exception or

   * the UNKNOWN if the repository ID does not match

   * the exception from the reachable code.

   */

  public void _read(InputStream input)

  {

    String id = input.read_string();

    Object ex = ObjectCreator.Idl2Object(id);

    if (ex == null)

      value = new UNKNOWN(id);

    else

      value = (Throwable) ex;

  }

  /**

   * Return the typecode of the stored exception.

   *

   * @return the value, passed as a_typecode in constructor.

   */

  public TypeCode _type()

  {

    return typecode;

  }

  /**

   * Write the exception into the give output stream. Writes the

   * repository id that is taken from the typecode. This method also

   * works when no helper class is available.

   *

   * @param output a stream to write into.

   *

   * @throws BAD_OPERATION if the value for the holder is not set or

   * the typecode cannot provide repository id.

   */

  public void _write(OutputStream output)

  {

    try

      {

        output.write_string(typecode.id());

      }

    catch (Exception ex)

      {

        BAD_OPERATION bad = new BAD_OPERATION();

        bad.minor = Minor.CDR;

        bad.initCause(ex);

        throw bad;

      }

  }

}