001/* UnionMemberHelper.java --
002   Copyright (C) 2005 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.Minor;
042import gnu.CORBA.OrbRestricted;
043import gnu.CORBA.TypeCodeHelper;
044
045import org.omg.CORBA.portable.InputStream;
046import 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 */
053public 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}