Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||
EmptyIterable |
|
| 1.0;1 |
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, 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 org.apache.giraph.utils; | |
20 | ||
21 | import java.util.Collections; | |
22 | ||
23 | import java.util.Iterator; | |
24 | ||
25 | /** | |
26 | * Singleton class for empty iterables. | |
27 | * | |
28 | * @param <T> Element type | |
29 | */ | |
30 | 0 | public class EmptyIterable<T> implements Iterable<T> { |
31 | /** Singleton empty iterable */ | |
32 | 0 | private static final EmptyIterable EMPTY_ITERABLE = new EmptyIterable(); |
33 | ||
34 | /** | |
35 | * Get the singleton empty iterable | |
36 | * | |
37 | * @param <T> Element type | |
38 | * @return Singleton empty iterable | |
39 | */ | |
40 | public static <T> Iterable<T> get() { | |
41 | 0 | return (Iterable<T>) EMPTY_ITERABLE; |
42 | } | |
43 | ||
44 | @Override | |
45 | public Iterator<T> iterator() { | |
46 | 0 | return Collections.emptyIterator(); |
47 | } | |
48 | } | |
49 |