Source for gnu.CORBA.NamingService.Binding_iterator_impl

   1: /* Binding_iterator.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 gnu.CORBA.NamingService;
  40: 
  41: import org.omg.CosNaming.Binding;
  42: import org.omg.CosNaming.BindingHolder;
  43: import org.omg.CosNaming.BindingListHolder;
  44: import org.omg.CosNaming.BindingType;
  45: import org.omg.CosNaming.NameComponent;
  46: import org.omg.CosNaming._BindingIteratorImplBase;
  47: 
  48: /**
  49:  * The implementation of the {@link BindingIterator}.
  50:  *
  51:  * @author Audrius Meskauskas, Lithuania (AudriusA@Bioinformatics.org)
  52:  */
  53: public class Binding_iterator_impl
  54:   extends _BindingIteratorImplBase
  55: {
  56:   /**
  57:    * The value, returned by the {@link #next_one} when there
  58:    * are no bindings available.
  59:    */
  60:   private static final Binding no_more_bindings =
  61:     new Binding(new NameComponent[ 0 ], BindingType.nobject);
  62: 
  63:   /**
  64:    * The collection of the available bindings.
  65:    */
  66:   private final Binding[] bindings;
  67: 
  68:   /**
  69:    * The position of the internal iterator pointer.
  70:    */
  71:   private int p;
  72: 
  73:   public Binding_iterator_impl(Binding[] a_bindings)
  74:   {
  75:     bindings = a_bindings;
  76:   }
  77: 
  78:   /**
  79:    * Disconnect the iterator from its ORB. The iterator will
  80:    * no longer be accessible and will be a subject of the
  81:    * garbage collection.
  82:    */
  83:   public void destroy()
  84:   {
  85:     _orb().disconnect(this);
  86:   }
  87: 
  88:   /**
  89:    * Return the desired amount of bindings.
  90:    *
  91:    * @param amount the maximal number of bindings to return.
  92:    * @param a_list a holder to store the returned bindings.
  93:    *
  94:    * @return false if there are no more bindings available,
  95:    * true otherwise.
  96:    */
  97:   public boolean next_n(int amount, BindingListHolder a_list)
  98:   {
  99:     if (p < bindings.length)
 100:       {
 101:         int n = bindings.length - p;
 102:         if (n > amount)
 103:           n = amount;
 104: 
 105:         a_list.value = new Binding[ n ];
 106:         for (int i = 0; i < n; i++)
 107:           a_list.value [ i ] = bindings [ p++ ];
 108: 
 109:         return true;
 110:       }
 111:     else
 112:       {
 113:         a_list.value = new Binding[ 0 ];
 114:         return false;
 115:       }
 116:   }
 117: 
 118:   /**
 119:    * Return the next binding.
 120:    *
 121:    * @param a_binding a holder, where the next binding will be stored.
 122:    *
 123:    * @return false if there are no more bindings available, true
 124:    * otherwise.
 125:    */
 126:   public boolean next_one(BindingHolder a_binding)
 127:   {
 128:     if (p < bindings.length)
 129:       {
 130:         a_binding.value = (Binding) bindings [ p++ ];
 131:         return true;
 132:       }
 133:     else
 134:       {
 135:         a_binding.value = no_more_bindings;
 136:         return false;
 137:       }
 138:   }
 139: }