/* ServiceContextHelper.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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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
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this exception to your version of the library, but you are not
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package org.omg.IOP;

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.InputStream;
import org.omg.CORBA.portable.OutputStream;

/**
* A helper operations for the structure {@link ServiceContext}.
*
* @author Audrius Meskauskas, Lithuania (AudriusA@Bioinformatics.org)
*/
public abstract class ServiceContextHelper
{
  /**
   * The cached typecode value, computed only once.
   */
  private static TypeCode typeCode;

  /**
   * Create the ServiceContext typecode (structure,
   * named "ServiceContext").
   * The typecode states that the structure contains the
   * following fields: context_id, context_data.
   */
  public static TypeCode type()
  {
    if (typeCode == null)
      {
        ORB orb = ORB.init();
        StructMember[] members = new StructMember[ 2 ];

        TypeCode field;

        field =
          orb.create_alias_tc("IDL:omg.org/IOP/ServiceId:1.0", "ServiceId",
                              orb.get_primitive_tc(TCKind.tk_ulong)
                             );
        members [ 0 ] = new StructMember("context_id", field, null);

        field =
          orb.create_sequence_tc(0, orb.get_primitive_tc(TCKind.tk_octet));
        members [ 1 ] = new StructMember("context_data", field, null);
        typeCode = orb.create_struct_tc(id(), "ServiceContext", members);
      }
    return typeCode;
  }

  /**
  * Insert the ServiceContext into the given Any.
  * This method uses the ServiceContextHolder.
  *
  * @param any the Any to insert into.
  * @param that the ServiceContext to insert.
  */
  public static void insert(Any any, ServiceContext that)
  {
    any.insert_Streamable(new ServiceContextHolder(that));
  }

  /**
   * Extract the ServiceContext from given Any.
   * This method uses the ServiceContextHolder.
   *
   * @throws BAD_OPERATION if the passed Any does not contain ServiceContext.
   */
  public static ServiceContext extract(Any any)
  {
    try
      {
        return ((ServiceContextHolder) any.extract_Streamable()).value;
      }
    catch (ClassCastException cex)
      {
        BAD_OPERATION bad = new BAD_OPERATION("ServiceContext expected");
        bad.initCause(cex);
        throw bad;
      }
  }

  /**
   * Get the ServiceContext repository id.
   *
   * @return "IDL:omg.org/IOP/ServiceContext:1.0", always.
   */
  public static String id()
  {
    return "IDL:omg.org/IOP/ServiceContext:1.0";
  }

  /**
   * Read the context from the CDR intput stream (first id, then
   * data as a flexible length byte sequence).
   *
   * @param input a org.omg.CORBA.portable stream to read from.
   */
  public static ServiceContext read(InputStream input)
  {
    ServiceContext value = new ServiceContext();
    value.context_id = input.read_long();
    value.context_data = new byte[ input.read_long() ];
    for (int i0 = 0; i0 < value.context_data.length; i0++)
      value.context_data [ i0 ] = input.read_octet();
    return value;
  }

  /**
   * Write the context to the CDR output stream (first id, then
   * data as a flexible length byte sequence).
   *
   * @param output a org.omg.CORBA.portable stream stream to write into.
   * @param value a value to write.
   */
  public static void write(OutputStream output, ServiceContext value)
  {
    output.write_long(value.context_id);
    output.write_long(value.context_data.length);
    for (int i0 = 0; i0 < value.context_data.length; i0++)
      output.write_octet(value.context_data [ i0 ]);
  }
}