001    /* AnySeqHelper.java --
002       Copyright (C) 2005, 2006 Free Software Foundation, Inc.
003    
004    This file is part of GNU Classpath.
005    
006    GNU Classpath is free software; you can redistribute it and/or modify
007    it under the terms of the GNU General Public License as published by
008    the Free Software Foundation; either version 2, or (at your option)
009    any later version.
010    
011    GNU Classpath is distributed in the hope that it will be useful, but
012    WITHOUT ANY WARRANTY; without even the implied warranty of
013    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
014    General Public License for more details.
015    
016    You should have received a copy of the GNU General Public License
017    along with GNU Classpath; see the file COPYING.  If not, write to the
018    Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
019    02110-1301 USA.
020    
021    Linking this library statically or dynamically with other modules is
022    making a combined work based on this library.  Thus, the terms and
023    conditions of the GNU General Public License cover the whole
024    combination.
025    
026    As a special exception, the copyright holders of this library give you
027    permission to link this library with independent modules to produce an
028    executable, regardless of the license terms of these independent
029    modules, and to copy and distribute the resulting executable under
030    terms of your choice, provided that you also meet, for each linked
031    independent module, the terms and conditions of the license of that
032    module.  An independent module is a module which is not derived from
033    or based on this library.  If you modify this library, you may extend
034    this exception to your version of the library, but you are not
035    obligated to do so.  If you do not wish to do so, delete this
036    exception statement from your version. */
037    
038    
039    package org.omg.CORBA;
040    
041    import gnu.CORBA.typecodes.ArrayTypeCode;
042    
043    import org.omg.CORBA.TypeCodePackage.BadKind;
044    import org.omg.CORBA.portable.InputStream;
045    import org.omg.CORBA.portable.OutputStream;
046    import 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     */
054    public 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    }