1 /* UnionMemberHelper.java --
2    Copyright (C) 2005 Free Software Foundation, Inc.
3 
4 This file is part of GNU Classpath.
5 
6 GNU Classpath is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
9 any later version.
10 
11 GNU Classpath is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14 General Public License for more details.
15 
16 You should have received a copy of the GNU General Public License
17 along with GNU Classpath; see the file COPYING.  If not, write to the
18 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
19 02110-1301 USA.
20 
21 Linking this library statically or dynamically with other modules is
22 making a combined work based on this library.  Thus, the terms and
23 conditions of the GNU General Public License cover the whole
24 combination.
25 
26 As a special exception, the copyright holders of this library give you
27 permission to link this library with independent modules to produce an
28 executable, regardless of the license terms of these independent
29 modules, and to copy and distribute the resulting executable under
30 terms of your choice, provided that you also meet, for each linked
31 independent module, the terms and conditions of the license of that
32 module.  An independent module is a module which is not derived from
33 or based on this library.  If you modify this library, you may extend
34 this exception to your version of the library, but you are not
35 obligated to do so.  If you do not wish to do so, delete this
36 exception statement from your version. */
37 
38 
39 package org.omg.CORBA;
40 
41 import gnu.CORBA.Minor;
42 import gnu.CORBA.OrbRestricted;
43 import gnu.CORBA.TypeCodeHelper;
44 
45 import org.omg.CORBA.portable.InputStream;
46 import org.omg.CORBA.portable.OutputStream;
47 
48 /**
49  * A helper operations for the union member.
50  *
51  * @author Audrius Meskauskas, Lithuania (AudriusA@Bioinformatics.org)
52  */
53 public abstract class UnionMemberHelper
54 {
55   /**
56    * The cached typecode value (computed once).
57    */
58   private static TypeCode typeCode;
59 
60   /**
61    * Used in creating recursive unions.
62    */
63   private static boolean active;
64 
65   /**
66    * Inset the union member into the given Any.
67    */
insert(Any a, UnionMember that)68   public static void insert(Any a, UnionMember that)
69   {
70     OutputStream out = a.create_output_stream();
71     a.type(type());
72     write(out, that);
73     a.read_value(out.create_input_stream(), type());
74   }
75 
76   /**
77    * Extract the union member from the given Any.
78    */
extract(Any a)79   public static UnionMember extract(Any a)
80   {
81     return read(a.create_input_stream());
82   }
83 
84   /**
85    * Create and return the typecode for this union member.
86    */
type()87   public static synchronized TypeCode type()
88   {
89     if (typeCode == null)
90       {
91         synchronized (TypeCode.class)
92           {
93             if (typeCode == null)
94               {
95                 if (active)
96                   {
97                     return OrbRestricted.Singleton.create_recursive_tc(id());
98                   }
99                 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    */
id()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    */
read(InputStream istream)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    */
write(OutputStream ostream, UnionMember value)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 }
183