001/* AnySeqHelper.java --
002   Copyright (C) 2005, 2006 Free Software Foundation, Inc.
003
004This file is part of GNU Classpath.
005
006GNU Classpath is free software; you can redistribute it and/or modify
007it under the terms of the GNU General Public License as published by
008the Free Software Foundation; either version 2, or (at your option)
009any later version.
010
011GNU Classpath is distributed in the hope that it will be useful, but
012WITHOUT ANY WARRANTY; without even the implied warranty of
013MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
014General Public License for more details.
015
016You should have received a copy of the GNU General Public License
017along with GNU Classpath; see the file COPYING.  If not, write to the
018Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
01902110-1301 USA.
020
021Linking this library statically or dynamically with other modules is
022making a combined work based on this library.  Thus, the terms and
023conditions of the GNU General Public License cover the whole
024combination.
025
026As a special exception, the copyright holders of this library give you
027permission to link this library with independent modules to produce an
028executable, regardless of the license terms of these independent
029modules, and to copy and distribute the resulting executable under
030terms of your choice, provided that you also meet, for each linked
031independent module, the terms and conditions of the license of that
032module.  An independent module is a module which is not derived from
033or based on this library.  If you modify this library, you may extend
034this exception to your version of the library, but you are not
035obligated to do so.  If you do not wish to do so, delete this
036exception statement from your version. */
037
038
039package org.omg.CORBA;
040
041import gnu.CORBA.typecodes.ArrayTypeCode;
042
043import org.omg.CORBA.TypeCodePackage.BadKind;
044import org.omg.CORBA.portable.InputStream;
045import org.omg.CORBA.portable.OutputStream;
046import org.omg.CORBA.portable.Streamable;
047
048/**
049 * Provides static helper methods for working with
050 * the array of the type {@link Any} (not with the "any array").
051 *
052 * @author Audrius Meskauskas (AudriusA@Bioinformatics.org)
053 */
054public abstract class AnySeqHelper
055{
056  /**
057   * Extract the array of {@link Any}'s from the
058   * given {@link Any}. This implementation expects the
059   * {@link Any} to hold the instance of {@link AnySeqHolder}
060   * that is returned by {@link Any#extract_Streamable() }.
061   *
062   * @param a an Any to extract the array from.
063   *
064   * @return the extracted array.
065   *
066   * @throws ClassCastException if the Any contains something other than the
067   * the {@link AnySeqHolder}.
068   */
069  public static Any[] extract(Any a)
070  {
071    AnySeqHolder h = (AnySeqHolder) a.extract_Streamable();
072    return h.value;
073  }
074
075  /**
076   * Returns the agreed Id, delegating functionality to
077   * the {@link #type()}.id().
078   */
079  public static String id()
080  {
081    try
082      {
083        return type().id();
084      }
085    catch (BadKind ex)
086      {
087        // Should never happen under correct work.
088        throw new Error("Please report this bug.", ex);
089      }
090  }
091
092  /**
093  * Insert into the given {@link Any}[] into the
094  * given {@link Any}. This implementation first creates
095  * a {@link AnySeqHolder} and then calls
096  * {@link Any#insert_Streamable(Streamable)}.
097  *
098  * @param into the target Any.
099  * @param that the array to insert.
100  */
101  public static void insert(Any into, Any[] that)
102  {
103    AnySeqHolder holder = new AnySeqHolder(that);
104    into.insert_Streamable(holder);
105  }
106
107  /**
108   * Reads the {@link Any}[] from the CORBA input stream.
109   * This implementation first creates an instance of
110   * {@link AnySeqHolder} and then delegates functionality
111   * to its <code>_read()</code> method.
112   *
113   * @param input the CORBA (not java.io) stream to read from.
114   * @return the value from the stream.
115   */
116  public static Any[] read(InputStream input)
117  {
118    Any[] value = new Any[ input.read_long() ];
119    for (int i = 0; i < value.length; i++)
120      {
121        value [ i ] = input.read_any();
122      }
123    return value;
124  }
125
126  /**
127   * Creates and returns a new instance of the TypeCode,
128   * corresponding the array of {@link Any}'s.
129   * The length of the sequence is left with the initial
130   * value 0.
131   */
132  public static TypeCode type()
133  {
134    return new ArrayTypeCode(TCKind.tk_any);
135  }
136
137  /**
138   * Writes the array of {@link Any}'s into the given stream.
139   *
140   * @param output the CORBA (not java.io) output stream to write.
141   * @param value the value that must be written.
142   */
143  public static void write(OutputStream output, Any[] value)
144  {
145    output.write_long(value.length);
146
147    for (int i = 0; i < value.length; i++)
148      {
149        output.write_any(value [ i ]);
150      }
151  }
152}