| 1 | /** |
| 2 | * Licensed to jclouds, Inc. (jclouds) under one or more |
| 3 | * contributor license agreements. See the NOTICE file |
| 4 | * distributed with this work for additional information |
| 5 | * regarding copyright ownership. jclouds 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.jclouds.functions; |
| 20 | |
| 21 | import javax.inject.Singleton; |
| 22 | |
| 23 | import com.google.common.base.Function; |
| 24 | import com.google.common.collect.Iterables; |
| 25 | |
| 26 | /** |
| 27 | * @author Adrian Cole |
| 28 | */ |
| 29 | @Singleton |
| 30 | public class OnlyElementOrNull<T> implements Function<Iterable<T>, T> { |
| 31 | |
| 32 | @Override |
| 33 | public T apply(Iterable<T> arg0) { |
| 34 | if (arg0 == null || Iterables.size(arg0) == 0) |
| 35 | return null; |
| 36 | return Iterables.getOnlyElement(arg0); |
| 37 | } |
| 38 | } |