dagger.producers.internal.MapOfProducedProducer Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of dagger-producers Show documentation

A fast dependency injector for Android and Java.

There is a newer version: 2.52

/*
 * 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.producers.internal;

import static com.google.common.util.concurrent.Futures.transform;
import static com.google.common.util.concurrent.MoreExecutors.directExecutor;

import com.google.common.base.Function;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.Iterables;
import com.google.common.collect.Maps;
import com.google.common.util.concurrent.Futures;
import com.google.common.util.concurrent.ListenableFuture;
import dagger.producers.Produced;
import dagger.producers.Producer;
import java.util.List;
import java.util.Map;
import javax.inject.Provider;

/**
 * A {@link Producer} implementation used to implement {@link Map} bindings. This producer returns a
 * {@code Map>} which is populated by calls to the delegate {@link Producer#get}
 * methods.
 */
public final class MapOfProducedProducer extends AbstractMapProducer> {
  private MapOfProducedProducer(ImmutableMap> contributingMap) {
    super(contributingMap);
  }

  @Override
  public ListenableFuture>> compute() {
    return Futures.transform(
        Futures.allAsList(
            Iterables.transform(
                contributingMap().entrySet(), MapOfProducedProducer.entryUnwrapper())),
        new Function>>, Map>>() {
          @Override
          public Map> apply(List>> entries) {
            return ImmutableMap.copyOf(entries);
          }
        },
        directExecutor());
  }

  private static final Function<
          Map.Entry>,
          ListenableFuture>>>
      ENTRY_UNWRAPPER =
          new Function<
              Map.Entry>,
              ListenableFuture>>>() {
            @Override
            public ListenableFuture>> apply(
                final Map.Entry> entry) {
              return transform(
                  Producers.createFutureProduced(entry.getValue().get()),
                  new Function, Map.Entry>>() {
                    @Override
                    public Map.Entry> apply(Produced