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 gnu.java.lang.CPStringBuilder;
  42: 
  43: import javax.naming.NamingEnumeration;
  44: 
  45: import org.omg.CosNaming.Binding;
  46: import org.omg.CosNaming.BindingIteratorHolder;
  47: import org.omg.CosNaming.BindingListHolder;
  48: import org.omg.CosNaming.NamingContext;
  49: 
  50: /**
  51:  * Iterates over bindings, obtaining values first from the binding list and then
  52:  * from the binding iterator.
  53:  *
  54:  * @author Audrius Meskauskas
  55:  */
  56: public class ListBindingsEnumeration extends GiopNamingEnumeration implements
  57:     NamingEnumeration
  58: {
  59:   /**
  60:    * The naming service, to resolve the objects.
  61:    */
  62:   NamingContext service;
  63: 
  64:   /**
  65:    * Create the new enumeration
  66:    *
  67:    * @param bh
  68:    *          holder, containing the first portion of the bindings
  69:    * @param bih
  70:    *          the iterator, containing the remaining bindings
  71:    * @param batchSize
  72:    *          the number of bindings the the iterator will be requested to
  73:    *          return as a single pack
  74:    * @param aService
  75:    *          the naming service, used to obtain the objects, bound to the
  76:    *          names.
  77:    */
  78:   public ListBindingsEnumeration(BindingListHolder bh,
  79:                                  BindingIteratorHolder bih, int batchSize,
  80:                                  NamingContext aService)
  81:   {
  82:     super(bh, bih, batchSize);
  83:     service = aService;
  84:   }
  85: 
  86:   /**
  87:    * Convert from the CORBA binding into the javax.naming binding. As the CORBA
  88:    * naming service binding does not contain the object itself, this method
  89:    * makes the additional calls to the naming service.
  90:    *
  91:    * @param binding
  92:    *          the binding to convert
  93:    * @return the value, that must be returned by the {@link #next()}.
  94:    */
  95:   public Object convert(Binding binding)
  96:   {
  97:     CPStringBuilder name = new CPStringBuilder();
  98: 
  99:     for (int i = 0; i < binding.binding_name.length; i++)
 100:       {
 101:         name.append(binding.binding_name[i]);
 102:         if (i < binding.binding_name.length - 1)
 103:           name.append('/');
 104:       }
 105: 
 106:     try
 107:       {
 108:         Object object = service.resolve(binding.binding_name);
 109:         return new javax.naming.Binding(name.toString(), object);
 110:       }
 111:     catch (Exception e)
 112:       {
 113:         // Probably was removed by the concurent thread.
 114:         return null;
 115:       }
 116:   }
 117: 
 118: }