/* AnySeqHelper.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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02110-1301 USA.

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making a combined work based on this library.  Thus, the terms and
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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.typecodes.ArrayTypeCode;

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

/**
 * Provides static helper methods for working with
 * the array of the type {@link Any} (not with the "any array").
 *
 * @author Audrius Meskauskas (AudriusA@Bioinformatics.org)
 */
public abstract class AnySeqHelper
{
  /**
   * Extract the array of {@link Any}'s from the
   * given {@link Any}. This implementation expects the
   * {@link Any} to hold the instance of {@link AnySeqHolder}
   * that is returned by {@link Any#extract_Streamable() }.
   *
   * @param a an Any to extract the array from.
   *
   * @return the extracted array.
   *
   * @throws ClassCastException if the Any contains something other than the
   * the {@link AnySeqHolder}.
   */
  public static Any[] extract(Any a)
  {
    AnySeqHolder h = (AnySeqHolder) a.extract_Streamable();
    return h.value;
  }

  /**
   * Returns the agreed Id, delegating functionality to
   * the {@link #type()}.id().
   */
  public static String id()
  {
    try
      {
        return type().id();
      }
    catch (BadKind ex)
      {
        // Should never happen under correct work.
        throw new Error("Please report this bug.", ex);
      }
  }

  /**
  * Insert into the given {@link Any}[] into the
  * given {@link Any}. This implementation first creates
  * a {@link AnySeqHolder} and then calls
  * {@link Any#insert_Streamable(Streamable)}.
  *
  * @param into the target Any.
  * @param that the array to insert.
  */
  public static void insert(Any into, Any[] that)
  {
    AnySeqHolder holder = new AnySeqHolder(that);
    into.insert_Streamable(holder);
  }

  /**
   * Reads the {@link Any}[] from the CORBA input stream.
   * This implementation first creates an instance of
   * {@link AnySeqHolder} and then delegates functionality
   * to its <code>_read()</code> method.
   *
   * @param input the CORBA (not java.io) stream to read from.
   * @return the value from the stream.
   */
  public static Any[] read(InputStream input)
  {
    Any[] value = new Any[ input.read_long() ];
    for (int i = 0; i < value.length; i++)
      {
        value [ i ] = input.read_any();
      }
    return value;
  }

  /**
   * Creates and returns a new instance of the TypeCode,
   * corresponding the array of {@link Any}'s.
   * The length of the sequence is left with the initial
   * value 0.
   */
  public static TypeCode type()
  {
    return new ArrayTypeCode(TCKind.tk_any);
  }

  /**
   * Writes the array of {@link Any}'s into the given stream.
   *
   * @param output the CORBA (not java.io) output stream to write.
   * @param value the value that must be written.
   */
  public static void write(OutputStream output, Any[] value)
  {
    output.write_long(value.length);

    for (int i = 0; i < value.length; i++)
      {
        output.write_any(value [ i ]);
      }
  }
}