dagger.internal.ProviderOfLazy Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of dapper Show documentation

dapper annotations and utils

There is a newer version: 2.41.2

/*
 * 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 jakarta.inject.Provider;

/**
 * A {@link Provider} of {@link Lazy} instances that each delegate to a given {@link Provider}.
 */
public final class ProviderOfLazy implements Provider> {

  private final Provider provider;

  private ProviderOfLazy(Provider 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 get() {
    return DoubleCheck.lazy(provider);
  }

  /**
   * Creates a new {@link Provider Provider<Lazy<T>>} that decorates the given
   * {@link Provider}.
   *
   * @see #get()
   */
  public static  Provider> create(Provider provider) {
    return new ProviderOfLazy(checkNotNull(provider));
  }
}