1/*
2 * Copyright (C) 2007 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package java.lang;
18
19import java.io.Serializable;
20import java.net.URL;
21import java.util.Enumeration;
22import java.util.NoSuchElementException;
23
24/**
25 * Empty enumeration class.  Call getInstance() to get the singleton.
26 *
27 * This is not part of the Java spec, so must be package-scope only.
28 */
29/*package*/ final class EmptyEnumeration implements Enumeration<URL>, Serializable {
30
31    private static final EmptyEnumeration mInst = new EmptyEnumeration();
32
33    /**
34     * One instance per VM.
35     */
36    private EmptyEnumeration() {}
37
38    /**
39     * Return instance.
40     */
41    public static EmptyEnumeration getInstance() {
42        return mInst;
43    }
44
45    /**
46     * Enumeration implementation.
47     */
48    public boolean hasMoreElements() {
49        return false;
50    }
51
52    public URL nextElement() {
53        throw new NoSuchElementException();
54    }
55}
56
57