Source for gnu.javax.naming.giop.ListBindingsEnumeration

   1: /* ListBindingsEnumeration.java -- handles corbaname: urls
   2:    Copyright (C) 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 gnu.javax.naming.giop;
  40: 
  41: import javax.naming.NamingEnumeration;
  42: 
  43: import org.omg.CosNaming.Binding;
  44: import org.omg.CosNaming.BindingIteratorHolder;
  45: import org.omg.CosNaming.BindingListHolder;
  46: import org.omg.CosNaming.NamingContext;
  47: 
  48: /**
  49:  * Iterates over bindings, obtaining values first from the binding list and then
  50:  * from the binding iterator.
  51:  * 
  52:  * @author Audrius Meskauskas
  53:  */
  54: public class ListBindingsEnumeration extends GiopNamingEnumeration implements
  55:     NamingEnumeration
  56: {
  57:   /**
  58:    * The naming service, to resolve the objects.
  59:    */
  60:   NamingContext service;
  61:   
  62:   /**
  63:    * Create the new enumeration
  64:    * 
  65:    * @param bh
  66:    *          holder, containing the first portion of the bindings
  67:    * @param bih
  68:    *          the iterator, containing the remaining bindings
  69:    * @param batchSize
  70:    *          the number of bindings the the iterator will be requested to
  71:    *          return as a single pack
  72:    * @param aService
  73:    *          the naming service, used to obtain the objects, bound to the
  74:    *          names.
  75:    */
  76:   public ListBindingsEnumeration(BindingListHolder bh, 
  77:                                  BindingIteratorHolder bih, int batchSize, 
  78:                                  NamingContext aService)
  79:   {
  80:     super(bh, bih, batchSize);
  81:     service = aService;
  82:   }
  83:   
  84:   /**
  85:    * Convert from the CORBA binding into the javax.naming binding. As the CORBA
  86:    * naming service binding does not contain the object itself, this method
  87:    * makes the additional calls to the naming service.
  88:    * 
  89:    * @param binding
  90:    *          the binding to convert
  91:    * @return the value, that must be returned by the {@link #next()}.
  92:    */
  93:   public Object convert(Binding binding)
  94:   {
  95:     StringBuffer name = new StringBuffer();
  96: 
  97:     for (int i = 0; i < binding.binding_name.length; i++)
  98:       {
  99:         name.append(binding.binding_name[i]);
 100:         if (i < binding.binding_name.length - 1)
 101:           name.append('/');
 102:       }
 103:     
 104:     try
 105:       {
 106:         Object object = service.resolve(binding.binding_name);
 107:         return new javax.naming.Binding(name.toString(), object);
 108:       }
 109:     catch (Exception e)
 110:       {
 111:         // Probably was removed by the concurent thread.
 112:         return null;
 113:       }
 114:   }
 115: 
 116: }