1 /*
   2  * Copyright (c) 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 /*
  27  * Licensed Materials - Property of IBM
  28  * RMI-IIOP v1.0
  29  * Copyright IBM Corp. 1998 1999  All Rights Reserved
  30  *
  31  */
  32 
  33 package com.sun.corba.se.impl.util;
  34 
  35 import java.util.Dictionary;
  36 import java.util.Enumeration;
  37 import java.util.NoSuchElementException;
  38 
  39 /**
  40  * A hashtable enumerator class.  This class should remain opaque
  41  * to the client. It will use the Enumeration interface.
  42  */
  43 class IdentityHashtableEnumerator implements Enumeration {
  44     boolean keys;
  45     int index;
  46     IdentityHashtableEntry table[];
  47     IdentityHashtableEntry entry;
  48 
  49     IdentityHashtableEnumerator(IdentityHashtableEntry table[], boolean keys) {
  50         this.table = table;
  51         this.keys = keys;
  52         this.index = table.length;
  53     }
  54 
  55     public boolean hasMoreElements() {
  56         if (entry != null) {
  57             return true;
  58         }
  59         while (index-- > 0) {
  60             if ((entry = table[index]) != null) {
  61                 return true;
  62             }
  63         }
  64         return false;
  65 }
  66 
  67 public Object nextElement() {
  68     if (entry == null) {
  69         while ((index-- > 0) && ((entry = table[index]) == null));
  70     }
  71     if (entry != null) {
  72             IdentityHashtableEntry e = entry;
  73         entry = e.next;
  74         return keys ? e.key : e.value;
  75     }
  76         throw new NoSuchElementException("IdentityHashtableEnumerator");
  77     }
  78 }