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 }