1 /*
   2  * Copyright (c) 1999, 2003, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package com.sun.corba.se.impl.naming.pcosnaming;
  27 
  28 // Import general CORBA classes
  29 import org.omg.CORBA.SystemException;
  30 import org.omg.CORBA.ORB;
  31 import org.omg.CORBA.INTERNAL;
  32 
  33 // Get org.omg.CosNaming Types
  34 import org.omg.CosNaming.Binding;
  35 import org.omg.CosNaming.BindingType;
  36 import org.omg.CosNaming.BindingTypeHolder;
  37 import org.omg.CosNaming.NameComponent;
  38 import org.omg.PortableServer.POA;
  39 
  40 // Get base implementation
  41 import com.sun.corba.se.impl.naming.pcosnaming.NamingContextImpl;
  42 import com.sun.corba.se.impl.naming.pcosnaming.InternalBindingValue;
  43 
  44 import com.sun.corba.se.impl.naming.cosnaming.BindingIteratorImpl;
  45 
  46 // Get a hash table
  47 import java.util.Hashtable;
  48 import java.util.Enumeration;
  49 
  50 /**
  51  * Class TransientBindingIterator implements the abstract methods
  52  * defined by BindingIteratorImpl, to use with the TransientNamingContext
  53  * implementation of the NamingContextImpl. The TransientBindingIterator
  54  * implementation receives a hash table of InternalBindingValues, and uses
  55  * an Enumeration to iterate over the contents of the hash table.
  56  * @see BindingIteratorImpl
  57  * @see TransientNamingContext
  58  */
  59 public class PersistentBindingIterator extends BindingIteratorImpl
  60 {
  61     private POA biPOA;
  62     /**
  63      * Constructs a new PersistentBindingIterator object.
  64      * @param orb a org.omg.CORBA.ORB object.
  65      * @param aTable A hashtable containing InternalBindingValues which is
  66      * the content of the PersistentNamingContext.
  67      * @exception Exception a Java exception thrown of the base class cannot
  68      * initialize.
  69    */
  70     public PersistentBindingIterator(org.omg.CORBA.ORB orb, Hashtable aTable,
  71         POA thePOA ) throws java.lang.Exception
  72     {
  73         super(orb);
  74         this.orb = orb;
  75         theHashtable = aTable;
  76         theEnumeration = this.theHashtable.keys();
  77         currentSize = this.theHashtable.size();
  78         biPOA = thePOA;
  79     }
  80 
  81     /**
  82    * Returns the next binding in the NamingContext. Uses the enumeration
  83    * object to determine if there are more bindings and if so, returns
  84    * the next binding from the InternalBindingValue.
  85    * @param b The Binding as an out parameter.
  86    * @return true if there were more bindings.
  87    */
  88     final public boolean NextOne(org.omg.CosNaming.BindingHolder b)
  89     {
  90         // If there are more elements get the next element
  91         boolean hasMore = theEnumeration.hasMoreElements();
  92         if (hasMore) {
  93             InternalBindingKey theBindingKey =
  94                  ((InternalBindingKey)theEnumeration.nextElement());
  95             InternalBindingValue theElement =
  96                 (InternalBindingValue)theHashtable.get( theBindingKey );
  97             NameComponent n = new NameComponent( theBindingKey.id, theBindingKey.kind );
  98             NameComponent[] nlist = new NameComponent[1];
  99             nlist[0] = n;
 100             BindingType theType = theElement.theBindingType;
 101 
 102             b.value =
 103                 new Binding( nlist, theType );
 104         } else {
 105             // Return empty but marshalable binding
 106             b.value = new Binding(new NameComponent[0],BindingType.nobject);
 107         }
 108         return hasMore;
 109     }
 110 
 111     /**
 112    * Destroys this BindingIterator by disconnecting from the ORB
 113    * @exception org.omg.CORBA.SystemException One of a fixed set of CORBA system exceptions.
 114    */
 115     final public void Destroy()
 116     {
 117         // Remove the object from the Active Object Map.
 118         try {
 119             byte[] objectId = biPOA.servant_to_id( this );
 120             if( objectId != null ) {
 121                 biPOA.deactivate_object( objectId );
 122             }
 123         }
 124         catch( Exception e ) {
 125             throw new INTERNAL( "Exception in BindingIterator.Destroy " + e );
 126         }
 127     }
 128 
 129     /**
 130    * Returns the remaining number of elements in the iterator.
 131    * @return the remaining number of elements in the iterator.
 132    */
 133     public final int RemainingElements() {
 134         return currentSize;
 135     }
 136 
 137     private int currentSize;
 138     private Hashtable theHashtable;
 139     private Enumeration theEnumeration;
 140     private org.omg.CORBA.ORB orb;
 141 }