IdentityHashtableEnumerator.java revision 608:7e06bf1dcb09 
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
33package com.sun.corba.se.impl.util;
34
35import java.util.Dictionary;
36import java.util.Enumeration;
37import 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 */
43class 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
67public 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}
79