libjava/classpath/org/omg/CosNaming/NamingContextHelper.java

   1 /* NamingContextHelper.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.CosNaming;
  40
  41 import gnu.CORBA.Minor;
  42 import gnu.CORBA.OrbRestricted;
  43
  44 import org.omg.CORBA.Any;
  45 import org.omg.CORBA.BAD_OPERATION;
  46 import org.omg.CORBA.BAD_PARAM;
  47 import org.omg.CORBA.ORB;
  48 import org.omg.CORBA.TypeCode;
  49 import org.omg.CORBA.portable.Delegate;
  50 import org.omg.CORBA.portable.InputStream;
  51 import org.omg.CORBA.portable.ObjectImpl;
  52 import org.omg.CORBA.portable.OutputStream;
  53
  54 /**
  55  * The helper operations for the naming context.
  56  *
  57  * @author Audrius Meskauskas, Lithuania (AudriusA@Bioinformatics.org)
  58  */
  59 public abstract class NamingContextHelper
  60 {
  61   /**
  62    * The naming context repository id.
  63    */
  64   private static String _id = "IDL:omg.org/CosNaming/NamingContext:1.0";
  65
  66   /**
  67    * Extract the naming context from the given {@link Any}.
  68    */
  69   public static NamingContext extract(Any a)
  70   {
  71     try
  72       {
  73         return ((NamingContextHolder) a.extract_Streamable()).value;
  74       }
  75     catch (ClassCastException ex)
  76       {
  77         BAD_OPERATION bad = new BAD_OPERATION("Naming context expected");
  78         bad.initCause(ex);
  79         bad.minor = Minor.Any;
  80         throw bad;
  81       }
  82   }
  83
  84   /**
  85    * Get the {@link NamingContext} repository id.
  86    */
  87   public static String id()
  88   {
  89     return _id;
  90   }
  91
  92   /**
  93    * Insert the naming context into the given {@link Any}
  94    */
  95   public static void insert(Any a, NamingContext that)
  96   {
  97     a.insert_Streamable(new NamingContextHolder(that));
  98   }
  99
 100   /**
 101    * Cast the passed object into the NamingContext. If the
 102    * object has a different java type, create an instance
 103    * of the NamingContext, using the same delegate, as for
 104    * the passed parameter.
 105    *
 106    * If the object repository Id indicates that it is an instance of
 107    *  {@link NamingContextExt} that is a subclass of the NamingContext,
 108    * the functionality is  delegated to {@link NamingContextHelper#narrow}.
 109    *
 110    * @param obj the object to cast.
 111    * @return casted instance.
 112    *
 113    * @throws BAD_PARAM if the passed object is not an instance of
 114    * {@link NamingContext} or {@link NamingContextExt}.
 115    */
 116   public static NamingContext narrow(org.omg.CORBA.Object obj)
 117   {
 118     if (obj == null)
 119       return null;
 120     else if (obj instanceof NamingContext)
 121       return (NamingContext) obj;
 122     else if (obj._is_a(id()))
 123       {
 124         Delegate delegate = ((ObjectImpl) obj)._get_delegate();
 125         return new _NamingContextStub(delegate);
 126       }
 127     else if (obj._is_a(NamingContextExtHelper.id()))
 128       return NamingContextExtHelper.narrow(obj);
 129     else
 130       throw new BAD_PARAM();
 131   }
 132
 133   /**
 134    * Narrow the given object to the NamingContext. No type-checking is performed
 135    * to verify that the object actually supports the requested type. The
 136    * {@link BAD_OPERATION} will be thrown if unsupported operations are invoked
 137    * on the new returned reference, but no failure is expected at the time of
 138    * the unchecked_narrow.
 139    *
 140    * @param obj the object to cast.
 141    *
 142    * @return the casted NamingContext.
 143    *
 144    * @since 1.5
 145    *
 146    * @see OMG issue 4158.
 147    */
 148   public static NamingContext unchecked_narrow(org.omg.CORBA.Object obj)
 149   {
 150     if (obj == null)
 151       return null;
 152     else if (obj instanceof NamingContext)
 153       return (NamingContext) obj;
 154     else
 155       {
 156         // Do not call the _is_a(..).
 157         Delegate delegate = ((ObjectImpl) obj)._get_delegate();
 158         return new _NamingContextStub(delegate);
 159       }
 160   }
 161
 162   /**
 163    * Read the naming context from the given CDR input stream.
 164    */
 165   public static NamingContext read(InputStream istream)
 166   {
 167     return narrow(istream.read_Object(_NamingContextStub.class));
 168   }
 169
 170   /**
 171    * Get the type code of the {@link NamingContext}.
 172    */
 173   public static TypeCode type()
 174   {
 175     return OrbRestricted.Singleton.create_interface_tc(id(), "NamingContext");
 176   }
 177
 178   /**
 179    * Write the given naming context into the given CDR output stream.
 180    */
 181   public static void write(OutputStream ostream, NamingContext value)
 182   {
 183     ostream.write_Object(value);
 184   }
 185 }