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/* CurrentHelper.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 org.omg.CORBA;

import org.omg.CORBA.Any;

import org.omg.CORBA.BAD_OPERATION;

import org.omg.CORBA.ORB;

import org.omg.CORBA.StructMember;

import org.omg.CORBA.TCKind;

import org.omg.CORBA.TypeCode;

import org.omg.CORBA.portable.Delegate;

import org.omg.CORBA.portable.InputStream;

import org.omg.CORBA.portable.ObjectImpl;

import org.omg.CORBA.portable.OutputStream;

/**

* The helper operations for the CORBA object {@link Current}.

*

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

*/

public abstract class CurrentHelper

{

  /**

   * The Current stub (proxy), used on the client side.

   * The {@link Current} methods should contain the code for remote

   * invocaton. As there are no methods defined, this class is only

   * used for the formal support of the

   * {@link #narrow(org.omg.CORBA.Object)}.

   */

  private static class _CurrentStub

    extends ObjectImpl

    implements Current

  {

    /**

     * Create the naming context stub with the given delegate.

     */

    public _CurrentStub(Delegate delegate)

    {

      _set_delegate(delegate);

    }

    /**

     * Return the array of repository ids for this object.

     */

    public String[] _ids()

    {

      return new String[] { id() };

    }

  }

  /**

   * The cached {@link Current} typecode, computed once.

   */

  private static TypeCode typeCode;

  /**

   * Get the type code of the {@link Current}.

   */

  public static TypeCode type()

  {

    if (typeCode == null)

      typeCode = ORB.init().create_interface_tc(id(), "Current");

    return typeCode;

  }

  /**

   * Insert the Current into the given Any.

   *

   * @param any the Any to insert into.

   * @param that the Current to insert.

   */

  public static void insert(Any any, Current that)

  {

    any.insert_Object(that);

  }

  /**

   * Extract the Current from given Any.

   *

   * @throws BAD_OPERATION if the passed Any does not contain Current.

   */

  public static Current extract(Any any)

  {

    return narrow(any.extract_Object());

  }

  /**

   * Get the Current repository id.

   *

   * @return "IDL:omg.org/CORBA/Current:1.0", always.

   */

  public static String id()

  {

    return "IDL:omg.org/CORBA/Current:1.0";

  }

  /**

   * Cast the passed object into the Current. If the

   * object has a different java type, create an instance

   * of the _CurrentStub, using the same delegate, as for

   * the passed parameter. Hence, unlike java type cast,

   * this method may return a different object, than has been passed.

   *

   * @param obj the object to narrow.

   * @return narrowed instance.

   *

   * @throws BAD_PARAM if the passed object is not a Current.

   */

  public static Current narrow(org.omg.CORBA.Object obj)

  {

    if (obj == null)

      return null;

    else if (obj instanceof Current)

      return (Current) obj;

    else if (!obj._is_a(id()))

      throw new BAD_PARAM("Not a Current");

    else

      {

        Delegate delegate = ((ObjectImpl) obj)._get_delegate();

        return new _CurrentStub(delegate);

      }

  }

  /**

   * Read the Current from the CDR intput stream (IOR profile expected).

   *

   * @param input a org.omg.CORBA.portable stream to read from.

   */

  public static Current read(InputStream input)

  {

    return narrow(input.read_Object());

  }

  /**

   * Write the Current to the CDR output stream (as IOR profile).

   *

   * @param output a org.omg.CORBA.portable stream stream to write into.

   * @param value a value to write.

   */

  public static void write(OutputStream output, Current value)

  {

    output.write_Object(value);

  }

}