Source for org.omg.CosNaming.NamingContextHelper

   1: /* NamingContextHelper.java --
   2:    Copyright (C) 2005, 2006 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.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:    * Extract the naming context from the given {@link Any}.
  67:    */
  68:   public static NamingContext extract(Any a)
  69:   {
  70:     try
  71:       {
  72:         return ((NamingContextHolder) a.extract_Streamable()).value;
  73:       }
  74:     catch (ClassCastException ex)
  75:       {
  76:         BAD_OPERATION bad = new BAD_OPERATION("Naming context expected");
  77:         bad.initCause(ex);
  78:         bad.minor = Minor.Any;        
  79:         throw bad;
  80:       }
  81:   }
  82: 
  83:   /**
  84:    * Get the {@link NamingContext} repository id.
  85:    */
  86:   public static String id()
  87:   {
  88:     return _id;
  89:   }
  90: 
  91:   /**
  92:    * Insert the naming context into the given {@link Any}
  93:    */
  94:   public static void insert(Any a, NamingContext that)
  95:   {
  96:     a.insert_Streamable(new NamingContextHolder(that));
  97:   }
  98: 
  99:   /**
 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: }