/* PolicyHelper.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
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General Public License for more details.

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02110-1301 USA.

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permission to link this library with independent modules to produce an
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package org.omg.CORBA;

import gnu.CORBA.Minor;
import gnu.CORBA.OrbRestricted;

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 Policy}.
*
* @author Audrius Meskauskas, Lithuania (AudriusA@Bioinformatics.org)
*/
public abstract class PolicyHelper
{
  /**
   * Get the type code of the {@link Policy}.
   *
   * @return interface typecode, named "Policy".
   */
  public static TypeCode type()
  {
    return OrbRestricted.Singleton.create_interface_tc(id(), "Policy");
  }

  /**
   * Insert the Policy into the given Any.
   *
   * @param any the Any to insert into.
   * @param that the Policy to insert.
   */
  public static void insert(Any any, Policy that)
  {
    any.insert_Streamable(new PolicyHolder(that));
  }

  /**
   * Extract the Policy from given Any.
   *
   * @throws BAD_OPERATION if the passed Any does not contain Policy.
   */
  public static Policy extract(Any any)
  {
    try
      {
        PolicyHolder h = (PolicyHolder) any.extract_Streamable();
        return h.value;
      }
    catch (ClassCastException ex)
      {
        BAD_OPERATION bad = new BAD_OPERATION("Policy expected");
        bad.minor = Minor.Any;
        throw bad;
      }
  }

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

  /**
   * Cast the passed object into the Policy. If the
   * object has a different java type, create an instance
   * of the _PolicyStub, 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 Policy.
   */
  public static Policy narrow(org.omg.CORBA.Object obj)
  {
    if (obj == null)
      return null;
    else if (obj instanceof Policy)
      return (Policy) obj;
    else
      {
        // Check for the policy id cannot be performed because
        // this helper must read various subclasses of the Policy,
        // and the IOR profile currently supports only one id.

        Delegate delegate = ((ObjectImpl) obj)._get_delegate();
        return new _PolicyStub(delegate);
      }
  }

  /**
   * Read the object from the CDR intput stream (IOR profile expected).
   *
   * @param input a org.omg.CORBA.portable stream to read from.
   */
  public static Policy read(InputStream input)
  {
    return narrow(input.read_Object());
  }

  /**
   * Write the object 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, Policy value)
  {
    output.write_Object(value);
  }
}