001    /* UnionMemberHelper.java --
002       Copyright (C) 2005 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.Minor;
042    import gnu.CORBA.OrbRestricted;
043    import gnu.CORBA.TypeCodeHelper;
044    
045    import org.omg.CORBA.portable.InputStream;
046    import org.omg.CORBA.portable.OutputStream;
047    
048    /**
049     * A helper operations for the union member.
050     *
051     * @author Audrius Meskauskas, Lithuania (AudriusA@Bioinformatics.org)
052     */
053    public abstract class UnionMemberHelper
054    {
055      /**
056       * The cached typecode value (computed once).
057       */
058      private static TypeCode typeCode;
059    
060      /**
061       * Used in creating recursive unions.
062       */
063      private static boolean active;
064    
065      /**
066       * Inset the union member into the given Any.
067       */
068      public static void insert(Any a, UnionMember that)
069      {
070        OutputStream out = a.create_output_stream();
071        a.type(type());
072        write(out, that);
073        a.read_value(out.create_input_stream(), type());
074      }
075    
076      /**
077       * Extract the union member from the given Any.
078       */
079      public static UnionMember extract(Any a)
080      {
081        return read(a.create_input_stream());
082      }
083    
084      /**
085       * Create and return the typecode for this union member.
086       */
087      public static synchronized TypeCode type()
088      {
089        if (typeCode == null)
090          {
091            synchronized (TypeCode.class)
092              {
093                if (typeCode == null)
094                  {
095                    if (active)
096                      {
097                        return OrbRestricted.Singleton.create_recursive_tc(id());
098                      }
099                    active = true;
100    
101                    ORB orb = OrbRestricted.Singleton;
102    
103                    StructMember[] members = new StructMember[ 4 ];
104                    TypeCode member;
105                    member = orb.create_string_tc(0);
106                    member =
107                      orb.create_alias_tc(IdentifierHelper.id(), "Identifier",
108                                          member
109                                         );
110                    members [ 0 ] = new StructMember("name", member, null);
111                    member = orb.get_primitive_tc(TCKind.tk_any);
112                    members [ 1 ] = new StructMember("label", member, null);
113                    member = orb.create_string_tc(0);
114                    member = orb.get_primitive_tc(TCKind.tk_TypeCode);
115                    members [ 2 ] = new StructMember("type", member, null);
116                    member = IDLTypeHelper.type();
117                    members [ 3 ] = new StructMember("type_def", member, null);
118                    typeCode =
119                      orb.create_struct_tc(UnionMemberHelper.id(), "UnionMember",
120                                           members
121                                          );
122                    active = false;
123                  }
124              }
125          }
126        return typeCode;
127      }
128    
129      /**
130       * Return the UnionMember repository id.
131       *
132       * @return "IDL:omg.org/CORBA/UnionMember:1.0", always.
133       */
134      public static String id()
135      {
136        return "IDL:omg.org/CORBA/UnionMember:1.0";
137      }
138    
139      /**
140       * Read the union member from the given stream.
141       */
142      public static UnionMember read(InputStream istream)
143      {
144        try
145          {
146            UnionMember value = new UnionMember();
147            value.name = istream.read_string();
148            value.label = istream.read_any();
149            value.type = TypeCodeHelper.read(istream);
150            value.type_def = IDLTypeHelper.read(istream);
151            return value;
152          }
153        catch (UserException ex)
154          {
155            MARSHAL m = new MARSHAL();
156            m.minor = Minor.UserException;
157            m.initCause(ex);
158            throw m;
159          }
160      }
161    
162      /**
163       * Write the union member to the given stream.
164       */
165      public static void write(OutputStream ostream, UnionMember value)
166      {
167        try
168          {
169            ostream.write_string(value.name);
170            ostream.write_any(value.label);
171            TypeCodeHelper.write(ostream, value.type);
172            IDLTypeHelper.write(ostream, value.type_def);
173          }
174        catch (UserException ex)
175          {
176            MARSHAL m = new MARSHAL();
177            m.minor = Minor.UserException;
178            m.initCause(ex);
179            throw m;
180          }
181      }
182    }