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/* ValueHandlerMultiFormat.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.

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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

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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

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independent module, the terms and conditions of the license of that

module.  An independent module is a module which is not derived from

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exception statement from your version. */

package javax.rmi.CORBA;

import org.omg.CORBA.portable.OutputStream;

import java.io.Serializable;

/**

 * This interface extends the previous ValueHandler, supporting various stream

 * format versions. The {@link ValueHandler} can be casted into this interface

 * to access additional features.

 *

 * @since 1.5

 *

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

 */

public interface ValueHandlerMultiFormat

  extends ValueHandler

{

  /**

   * Get the maximal supported version for the value types, supported by

   * this value handler. The versions are integer numbers, the currently valid

   * values being 1 and 2.

   *

   * These two versions differ in how the additional data, stored by the

   * writeObject method, are encoded.

   * <ul>

   * <li> For version 1 (GNU Classpath default), that data (if present) are

   * written "as is". </li>

   * <li>For version 2, this data fragment is enclosed within a CDR custom

   * valuetype with no codebase and repository Id "RMI:org.omg.custom.<class>"

   * where <class> is the fully-qualified name of the class whose writeObject

   * method is being invoked. If the object does not write any data via

   * writeObject method, the null valuetype (0x0) must be written.</li>

   * </ul>

   * As the version number is part of the value type record, there is no need

   * to the format control during the reading.

   *

   * @return the maximal supported version.

   */

  byte getMaximumStreamFormatVersion();

  /**

   * Write the value type to the output stream using the given format version.

   * The older method {@link ValueHandler#writeValue} always uses the version 1.

   *

   * @param output the stream, where the value should be written, must implement

   * {@link ValueOutputStream}.

   * @param value the value that should be written.

   * @param version the version of the format that must be used to write the

   * value.

   *

   * @throws BAD_PARAM if the version number is less than 1 or greater than the

   * maximal supported version.

   */

  void writeValue(OutputStream output, Serializable value, byte version);

}