1 /*
2 * JBoss, Home of Professional Open Source.
3 * Copyright 2014 Red Hat, Inc., and individual contributors
4 * as indicated by the @author tags.
5 *
6 * Licensed under the Apache License, Version 2.0 (the "License");
7 * you may not use this file except in compliance with the License.
8 * 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, software
13 * distributed under the License is distributed on an "AS IS" BASIS,
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
17 */
18
19 package io.undertow.servlet.util;
20
21 import java.util.Enumeration;
22
23 /**
24 * @author Stuart Douglas
25 */
26 public class EmptyEnumeration implements Enumeration<Object> {
27
28 private static final Enumeration<?> INSTANCE = new EmptyEnumeration();
29
30 @SuppressWarnings("unchecked")
31 public static <T> Enumeration<T> instance() {
32 return (Enumeration<T>) INSTANCE;
33 }
34
35 private EmptyEnumeration() {
36
37 }
38
39 @Override
40 public boolean hasMoreElements() {
41 return false;
42 }
43
44 @Override
45 public Object nextElement() {
46 return null;
47 }
48 }
49