/* OctetSeqHelper.java --
   Copyright (C) 2005, 2006 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.

Linking this library statically or dynamically with other modules is
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;
import org.omg.CORBA.portable.Streamable;

/**
 * Provides static helper methods for working with
 * CORBA sequence of <code>byte</code>
 * (<code>OctetSeq</code>).
 *
 * @author Audrius Meskauskas (AudriusA@Bioinformatics.org)
 */
public abstract class OctetSeqHelper
{
  /**
   * Extract the <code>byte[]</code> from the
   * given {@link Any}. This implementation expects the
   * {@link Any} to hold the instance of {@link OctetSeqHolder}
   * 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 OctetSeqHolder}.
   */
  public static byte[] extract(Any a)
  {
    OctetSeqHolder h = (OctetSeqHolder) 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 <code>byte[]</code> into the
  * given {@link Any}. This implementation first creates
  * a {@link OctetSeqHolder} 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, byte[] that)
  {
    OctetSeqHolder holder = new OctetSeqHolder(that);
    into.insert_Streamable(holder);
  }

  /**
   * Reads the <code>byte[]</code> from the CORBA input stream.
   *
   * @param input the CORBA (not java.io) stream to read from.
   * @return the value from the stream.
   */
  public static byte[] read(InputStream input)
  {
    byte[] value = new byte[ input.read_long() ];
    input.read_octet_array(value, 0, value.length);
    return value;
  }

  /**
   * Creates and returns a new instance of the TypeCode,
   * corresponding the CORBA <code>OctetSeq</code>.
   * The length of the sequence is left with the initial
   * value 0.
   */
  public static TypeCode type()
  {
    return new ArrayTypeCode(TCKind.tk_octet);
  }

  /**
   * Writes the <code>byte[]</code> 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, byte[] value)
  {
    output.write_long(value.length);
    output.write_octet_array(value, 0, value.length);
  }
}