old-autovect-branch/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
  43 import org.omg.CORBA.Any;
  44 import org.omg.CORBA.BAD_OPERATION;
  45 import org.omg.CORBA.BAD_PARAM;
  46 import org.omg.CORBA.ORB;
  47 import org.omg.CORBA.TypeCode;
  48 import org.omg.CORBA.portable.Delegate;
  49 import org.omg.CORBA.portable.InputStream;
  50 import org.omg.CORBA.portable.ObjectImpl;
  51 import org.omg.CORBA.portable.OutputStream;
  52
  53 /**
  54  * The helper operations for the naming context.
  55  *
  56  * @author Audrius Meskauskas, Lithuania (AudriusA@Bioinformatics.org)
  57  */
  58 public abstract class NamingContextHelper
  59 {
  60   /**
  61    * The naming context repository id.
  62    */
  63   private static String _id = "IDL:omg.org/CosNaming/NamingContext:1.0";
  64
  65   /**
  66    * The cached {@link NamingContext} typecode.
  67    */
  68   private static TypeCode typeCode;
  69
  70   /**
  71    * Extract the naming context from the given {@link Any}.
  72    */
  73   public static NamingContext extract(Any a)
  74   {
  75     try
  76       {
  77         return ((NamingContextHolder) a.extract_Streamable()).value;
  78       }
  79     catch (ClassCastException ex)
  80       {
  81         BAD_OPERATION bad = new BAD_OPERATION("Naming context expected");
  82         bad.initCause(ex);
  83         bad.minor = Minor.Any;
  84         throw bad;
  85       }
  86   }
  87
  88   /**
  89    * Get the {@link NamingContext} repository id.
  90    */
  91   public static String id()
  92   {
  93     return _id;
  94   }
  95
  96   /**
  97    * Insert the naming context into the given {@link Any}
  98    */
  99   public static void insert(Any a, NamingContext that)
 100   {
 101     a.insert_Streamable(new NamingContextHolder(that));
 102   }
 103
 104   /**
 105    * Cast the passed object into the NamingContext. If the
 106    * object has a different java type, create an instance
 107    * of the NamingContext, using the same delegate, as for
 108    * the passed parameter.
 109    *
 110    * If the object repository Id indicates that it is an instance of
 111    *  {@link NamingContextExt} that is a subclass of the NamingContext,
 112    * the functionality is  delegated to {@link NamingContextHelper#narrow}.
 113    *
 114    * @param obj the object to cast.
 115    * @return casted instance.
 116    *
 117    * @throws BAD_PARAM if the passed object is not an instance of
 118    * {@link NamingContext} or {@link NamingContextExt}.
 119    */
 120   public static NamingContext narrow(org.omg.CORBA.Object obj)
 121   {
 122     if (obj == null)
 123       return null;
 124     else if (obj instanceof NamingContext)
 125       return (NamingContext) obj;
 126     else if (obj._is_a(id()))
 127       {
 128         Delegate delegate = ((ObjectImpl) obj)._get_delegate();
 129         return new _NamingContextStub(delegate);
 130       }
 131     else if (obj._is_a(NamingContextExtHelper.id()))
 132       return NamingContextExtHelper.narrow(obj);
 133     else
 134       throw new BAD_PARAM();
 135   }
 136
 137   /**
 138    * Narrow the given object to the NamingContext. No type-checking is performed
 139    * to verify that the object actually supports the requested type. The
 140    * {@link BAD_OPERATION} will be thrown if unsupported operations are invoked
 141    * on the new returned reference, but no failure is expected at the time of
 142    * the unchecked_narrow.
 143    *
 144    * @param obj the object to cast.
 145    *
 146    * @return the casted NamingContext.
 147    *
 148    * @since 1.5
 149    *
 150    * @see OMG issue 4158.
 151    */
 152   public static NamingContext unchecked_narrow(org.omg.CORBA.Object obj)
 153   {
 154     if (obj == null)
 155       return null;
 156     else if (obj instanceof NamingContext)
 157       return (NamingContext) obj;
 158     else
 159       {
 160         // Do not call the _is_a(..).
 161         Delegate delegate = ((ObjectImpl) obj)._get_delegate();
 162         return new _NamingContextStub(delegate);
 163       }
 164   }
 165
 166   /**
 167    * Read the naming context from the given CDR input stream.
 168    */
 169   public static NamingContext read(InputStream istream)
 170   {
 171     return narrow(istream.read_Object(_NamingContextStub.class));
 172   }
 173
 174   /**
 175    * Get the type code of the {@link NamingContext}.
 176    */
 177   public static TypeCode type()
 178   {
 179     if (typeCode == null)
 180       typeCode = ORB.init().create_interface_tc(id(), "NamingContext");
 181     return typeCode;
 182   }
 183
 184   /**
 185    * Write the given naming context into the given CDR output stream.
 186    */
 187   public static void write(OutputStream ostream, NamingContext value)
 188   {
 189     ostream.write_Object(value);
 190   }
 191 }