001 /* NamingContextHelper.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.CosNaming;
040
041 import gnu.CORBA.Minor;
042 import gnu.CORBA.OrbRestricted;
043
044 import org.omg.CORBA.Any;
045 import org.omg.CORBA.BAD_OPERATION;
046 import org.omg.CORBA.BAD_PARAM;
047 import org.omg.CORBA.TypeCode;
048 import org.omg.CORBA.portable.Delegate;
049 import org.omg.CORBA.portable.InputStream;
050 import org.omg.CORBA.portable.ObjectImpl;
051 import org.omg.CORBA.portable.OutputStream;
052
053 /**
054 * The helper operations for the naming context.
055 *
056 * @author Audrius Meskauskas, Lithuania (AudriusA@Bioinformatics.org)
057 */
058 public abstract class NamingContextHelper
059 {
060 /**
061 * The naming context repository id.
062 */
063 private static String _id = "IDL:omg.org/CosNaming/NamingContext:1.0";
064
065 /**
066 * Extract the naming context from the given {@link Any}.
067 */
068 public static NamingContext extract(Any a)
069 {
070 try
071 {
072 return ((NamingContextHolder) a.extract_Streamable()).value;
073 }
074 catch (ClassCastException ex)
075 {
076 BAD_OPERATION bad = new BAD_OPERATION("Naming context expected");
077 bad.initCause(ex);
078 bad.minor = Minor.Any;
079 throw bad;
080 }
081 }
082
083 /**
084 * Get the {@link NamingContext} repository id.
085 */
086 public static String id()
087 {
088 return _id;
089 }
090
091 /**
092 * Insert the naming context into the given {@link Any}
093 */
094 public static void insert(Any a, NamingContext that)
095 {
096 a.insert_Streamable(new NamingContextHolder(that));
097 }
098
099 /**
100 * Cast the passed object into the NamingContext. If the
101 * object has a different java type, create an instance
102 * of the NamingContext, using the same delegate, as for
103 * the passed parameter.
104 *
105 * If the object repository Id indicates that it is an instance of
106 * {@link NamingContextExt} that is a subclass of the NamingContext,
107 * the functionality is delegated to {@link NamingContextHelper#narrow}.
108 *
109 * @param obj the object to cast.
110 * @return casted instance.
111 *
112 * @throws BAD_PARAM if the passed object is not an instance of
113 * {@link NamingContext} or {@link NamingContextExt}.
114 */
115 public static NamingContext narrow(org.omg.CORBA.Object obj)
116 {
117 if (obj == null)
118 return null;
119 else if (obj instanceof NamingContext)
120 return (NamingContext) obj;
121 else if (obj._is_a(id()))
122 {
123 Delegate delegate = ((ObjectImpl) obj)._get_delegate();
124 return new _NamingContextStub(delegate);
125 }
126 else if (obj._is_a(NamingContextExtHelper.id()))
127 return NamingContextExtHelper.narrow(obj);
128 else
129 throw new BAD_PARAM();
130 }
131
132 /**
133 * Narrow the given object to the NamingContext. No type-checking is performed
134 * to verify that the object actually supports the requested type. The
135 * {@link BAD_OPERATION} will be thrown if unsupported operations are invoked
136 * on the new returned reference, but no failure is expected at the time of
137 * the unchecked_narrow. See OMG issue 4158.
138 *
139 * @param obj the object to cast.
140 *
141 * @return the casted NamingContext.
142 */
143 public static NamingContext unchecked_narrow(org.omg.CORBA.Object obj)
144 {
145 if (obj == null)
146 return null;
147 else if (obj instanceof NamingContext)
148 return (NamingContext) obj;
149 else
150 {
151 // Do not call the _is_a(..).
152 Delegate delegate = ((ObjectImpl) obj)._get_delegate();
153 return new _NamingContextStub(delegate);
154 }
155 }
156
157 /**
158 * Read the naming context from the given CDR input stream.
159 */
160 public static NamingContext read(InputStream istream)
161 {
162 return narrow(istream.read_Object(_NamingContextStub.class));
163 }
164
165 /**
166 * Get the type code of the {@link NamingContext}.
167 */
168 public static TypeCode type()
169 {
170 return OrbRestricted.Singleton.create_interface_tc(id(), "NamingContext");
171 }
172
173 /**
174 * Write the given naming context into the given CDR output stream.
175 */
176 public static void write(OutputStream ostream, NamingContext value)
177 {
178 ostream.write_Object(value);
179 }
180 }