| 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.collect; |
| 20 | |
| 21 | import static com.google.common.base.Preconditions.checkNotNull; |
| 22 | import static com.google.common.collect.Iterables.transform; |
| 23 | import static com.google.common.collect.Sets.newLinkedHashSet; |
| 24 | |
| 25 | import java.util.Set; |
| 26 | |
| 27 | import com.google.common.base.Function; |
| 28 | import com.google.common.base.Supplier; |
| 29 | |
| 30 | /** |
| 31 | * |
| 32 | * @author Adrian Cole |
| 33 | */ |
| 34 | public class TransformingSetSupplier<F, T> implements Supplier<Set<? extends T>> { |
| 35 | private final Supplier<Iterable<F>> backingSupplier; |
| 36 | private final Function<F, T> converter; |
| 37 | |
| 38 | public TransformingSetSupplier(Supplier<Iterable<F>> backingSupplier, Function<F, T> converter) { |
| 39 | this.backingSupplier = checkNotNull(backingSupplier, "backingSupplier"); |
| 40 | this.converter = checkNotNull(converter, "converter"); |
| 41 | } |
| 42 | |
| 43 | @Override |
| 44 | public Set<? extends T> get() { |
| 45 | return newLinkedHashSet(transform(backingSupplier.get(), converter)); |
| 46 | } |
| 47 | |
| 48 | } |