| /* |
| * Copyright (C) 2016 The Dagger Authors. |
| * |
| * Licensed 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 dagger.internal; |
| |
| import static dagger.internal.Preconditions.checkNotNull; |
| |
| import dagger.Lazy; |
| import javax.inject.Provider; |
| |
| /** |
| * A {@link Provider} of {@link Lazy} instances that each delegate to a given {@link Provider}. |
| */ |
| public final class ProviderOfLazy<T> implements Provider<Lazy<T>> { |
| |
| private final Provider<T> provider; |
| |
| private ProviderOfLazy(Provider<T> provider) { |
| assert provider != null; |
| this.provider = provider; |
| } |
| |
| /** |
| * Returns a new instance of {@link Lazy Lazy<T>}, which calls {@link Provider#get()} at |
| * most once on the {@link Provider} held by this object. |
| */ |
| @Override |
| public Lazy<T> get() { |
| return DoubleCheck.lazy(provider); |
| } |
| |
| /** |
| * Creates a new {@link Provider Provider<Lazy<T>>} that decorates the given |
| * {@link Provider}. |
| * |
| * @see #get() |
| */ |
| public static <T> Provider<Lazy<T>> create(Provider<T> provider) { |
| return new ProviderOfLazy<T>(checkNotNull(provider)); |
| } |
| } |