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104 lines
3.3 KiB
104 lines
3.3 KiB
/*
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* Copyright (C) 2016 The Dagger Authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package dagger.producers.internal;
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import static com.google.common.util.concurrent.MoreExecutors.directExecutor;
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import com.google.common.base.Function;
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import com.google.common.collect.ImmutableMap;
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import com.google.common.collect.Maps;
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import com.google.common.util.concurrent.Futures;
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import com.google.common.util.concurrent.ListenableFuture;
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import dagger.producers.Producer;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.Map;
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import java.util.Map.Entry;
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import javax.inject.Provider;
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/**
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* A {@link Producer} implementation used to implement {@link Map} bindings. This producer returns a
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* {@code Map<K, V>} which is populated by calls to the delegate {@link Producer#get} methods.
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*/
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public final class MapProducer<K, V> extends AbstractMapProducer<K, V, V> {
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private MapProducer(ImmutableMap<K, Producer<V>> contributingMap) {
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super(contributingMap);
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}
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/** Returns a new {@link Builder}. */
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public static <K, V> Builder<K, V> builder(int size) {
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return new Builder<>(size);
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}
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/** A builder for {@link MapProducer} */
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public static final class Builder<K, V> extends AbstractMapProducer.Builder<K, V, V> {
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private Builder(int size) {
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super(size);
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}
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@Override
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public Builder<K, V> put(K key, Producer<V> producerOfValue) {
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super.put(key, producerOfValue);
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return this;
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}
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@Override
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public Builder<K, V> put(K key, Provider<V> providerOfValue) {
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super.put(key, providerOfValue);
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return this;
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}
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@Override
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public Builder<K, V> putAll(Producer<Map<K, V>> mapProducer) {
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super.putAll(mapProducer);
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return this;
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}
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/** Returns a new {@link MapProducer}. */
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public MapProducer<K, V> build() {
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return new MapProducer<>(mapBuilder.build());
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}
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}
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@Override
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protected ListenableFuture<Map<K, V>> compute() {
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final List<ListenableFuture<Map.Entry<K, V>>> listOfEntries = new ArrayList<>();
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for (final Entry<K, Producer<V>> entry : contributingMap().entrySet()) {
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listOfEntries.add(
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Futures.transform(
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entry.getValue().get(),
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new Function<V, Entry<K, V>>() {
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@Override
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public Entry<K, V> apply(V computedValue) {
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return Maps.immutableEntry(entry.getKey(), computedValue);
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}
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},
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directExecutor()));
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}
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return Futures.transform(
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Futures.allAsList(listOfEntries),
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new Function<List<Map.Entry<K, V>>, Map<K, V>>() {
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@Override
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public Map<K, V> apply(List<Map.Entry<K, V>> entries) {
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return ImmutableMap.copyOf(entries);
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}
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},
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directExecutor());
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}
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}
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