1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one
3 * or more contributor license agreements. See the NOTICE file
4 * distributed with this work for additional information
5 * regarding copyright ownership. The ASF licenses this file
6 * to you under the Apache License, Version 2.0 (the
7 * "License"); you may not use this file except in compliance
8 * with the License. You may obtain a copy of the License at
9 *
10 * http://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing,
13 * software distributed under the License is distributed on an
14 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15 * KIND, either express or implied. See the License for the
16 * specific language governing permissions and limitations
17 * under the License.
18 */
19 package org.apache.myfaces.shared.util;
20
21 import java.util.Enumeration;
22 import java.util.NoSuchElementException;
23
24 /**
25 * Enumeration without elements
26 *
27 * @author Anton Koinov (latest modification by $Author: lu4242 $)
28 * @version $Revision: 1200042 $ $Date: 2011-11-09 18:40:12 -0500 (Wed, 09 Nov 2011) $
29 */
30 public final class NullEnumeration implements Enumeration
31 {
32 private static final NullEnumeration NULL_ENUMERATION = new NullEnumeration();
33
34 public static final NullEnumeration instance()
35 {
36 return NULL_ENUMERATION;
37 }
38
39 public boolean hasMoreElements()
40 {
41 return false;
42 }
43
44 public Object nextElement()
45 {
46 throw new NoSuchElementException("NullEnumeration has no elements");
47 }
48 }