| /** |
| * Licensed to jclouds, Inc. (jclouds) under one or more |
| * contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. jclouds licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| package org.jclouds.collect; |
| |
| import static com.google.common.base.Preconditions.checkNotNull; |
| import static com.google.common.base.Predicates.notNull; |
| import static com.google.common.collect.Iterables.filter; |
| import static com.google.common.collect.Iterables.transform; |
| |
| import java.util.Set; |
| |
| import com.google.common.base.Function; |
| import com.google.common.base.Supplier; |
| import com.google.common.collect.ImmutableSet; |
| |
| /** |
| * |
| * @author Adrian Cole |
| */ |
| public class TransformingSetSupplier<F, T> implements Supplier<Set<? extends T>> { |
| private final Supplier<Iterable<F>> backingSupplier; |
| private final Function<F, T> converter; |
| |
| public TransformingSetSupplier(Supplier<Iterable<F>> backingSupplier, Function<F, T> converter) { |
| this.backingSupplier = checkNotNull(backingSupplier, "backingSupplier"); |
| this.converter = checkNotNull(converter, "converter"); |
| } |
| |
| @Override |
| public Set<? extends T> get() { |
| return ImmutableSet.copyOf(filter(transform(filter(backingSupplier.get(), notNull()), converter), notNull())); |
| } |
| |
| } |