Source for org.omg.CosNaming.NamingContextHelper

   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 org.omg.CORBA.Any;
  42: import org.omg.CORBA.BAD_OPERATION;
  43: import org.omg.CORBA.BAD_PARAM;
  44: import org.omg.CORBA.ORB;
  45: import org.omg.CORBA.TypeCode;
  46: import org.omg.CORBA.portable.Delegate;
  47: import org.omg.CORBA.portable.InputStream;
  48: import org.omg.CORBA.portable.ObjectImpl;
  49: import org.omg.CORBA.portable.OutputStream;
  50: 
  51: /**
  52:  * The helper operations for the naming context.
  53:  *
  54:  * @author Audrius Meskauskas, Lithuania (AudriusA@Bioinformatics.org)
  55:  */
  56: public abstract class NamingContextHelper
  57: {
  58:   /**
  59:    * The naming context repository id.
  60:    */
  61:   private static String _id = "IDL:omg.org/CosNaming/NamingContext:1.0";
  62: 
  63:   /**
  64:    * The cached {@link NamingContext} typecode.
  65:    */
  66:   private static TypeCode typeCode;
  67: 
  68:   /**
  69:    * Extract the naming context from the given {@link Any}.
  70:    */
  71:   public static NamingContext extract(Any a)
  72:   {
  73:     try
  74:       {
  75:         return ((NamingContextHolder) a.extract_Streamable()).value;
  76:       }
  77:     catch (ClassCastException ex)
  78:       {
  79:         BAD_OPERATION bad = new BAD_OPERATION("Naming context expected");
  80:         bad.initCause(ex);
  81:         throw bad;
  82:       }
  83:   }
  84: 
  85:   /**
  86:    * Get the {@link NamingContext} repository id.
  87:    */
  88:   public static String id()
  89:   {
  90:     return _id;
  91:   }
  92: 
  93:   /**
  94:    * Insert the naming context into the given {@link Any}
  95:    */
  96:   public static void insert(Any a, NamingContext that)
  97:   {
  98:     a.insert_Streamable(new NamingContextHolder(that));
  99:   }
 100: 
 101:   /**
 102:    * Cast the passed object into the NamingContext. If the
 103:    * object has a different java type, create an instance
 104:    * of the NamingContext, using the same delegate, as for
 105:    * the passed parameter.
 106:    *
 107:    * If the object repository Id indicates that it is an instance of
 108:    *  {@link NamingContextExt} that is a subclass of the NamingContext,
 109:    * the functionality is  delegated to {@link NamingContextHelper#narrow}.
 110:    *
 111:    * @param obj the object to cast.
 112:    * @return casted instance.
 113:    *
 114:    * @throws BAD_PARAM if the passed object is not an instance of
 115:    * {@link NamingContext} or {@link NamingContextExt}.
 116:    */
 117:   public static NamingContext narrow(org.omg.CORBA.Object obj)
 118:   {
 119:     if (obj == null)
 120:       return null;
 121:     else if (obj instanceof NamingContext)
 122:       return (NamingContext) obj;
 123:     else if (obj._is_a(id()))
 124:       {
 125:         Delegate delegate = ((ObjectImpl) obj)._get_delegate();
 126:         return new _NamingContextStub(delegate);
 127:       }
 128:     else if (obj._is_a(NamingContextExtHelper.id()))
 129:       return NamingContextExtHelper.narrow(obj);
 130:     else
 131:       throw new BAD_PARAM();
 132:   }
 133: 
 134:   /**
 135:    * Read the naming context from the given CDR input stream.
 136:    */
 137:   public static NamingContext read(InputStream istream)
 138:   {
 139:     return narrow(istream.read_Object(_NamingContextStub.class));
 140:   }
 141: 
 142:   /**
 143:    * Get the type code of the {@link NamingContext}.
 144:    */
 145:   public static TypeCode type()
 146:   {
 147:     if (typeCode == null)
 148:       typeCode = ORB.init().create_interface_tc(id(), "NamingContext");
 149:     return typeCode;
 150:   }
 151: 
 152:   /**
 153:    * Write the given naming context into the given CDR output stream.
 154:    */
 155:   public static void write(OutputStream ostream, NamingContext value)
 156:   {
 157:     ostream.write_Object(value);
 158:   }
 159: }