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 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: }