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/*
* 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));
}
}