1 /* 2 * Copyright (C) 2016 The Dagger Authors. 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package dagger.producers.internal; 18 19 import static com.google.common.util.concurrent.MoreExecutors.directExecutor; 20 import static dagger.internal.Providers.asDaggerProvider; 21 22 import com.google.common.base.Function; 23 import com.google.common.collect.ImmutableMap; 24 import com.google.common.collect.Maps; 25 import com.google.common.util.concurrent.Futures; 26 import com.google.common.util.concurrent.ListenableFuture; 27 import dagger.internal.Provider; 28 import dagger.producers.Producer; 29 import java.util.ArrayList; 30 import java.util.List; 31 import java.util.Map; 32 import java.util.Map.Entry; 33 34 /** 35 * A {@link Producer} implementation used to implement {@link Map} bindings. This producer returns a 36 * {@code Map<K, V>} which is populated by calls to the delegate {@link Producer#get} methods. 37 */ 38 public final class MapProducer<K, V> extends AbstractMapProducer<K, V, V> { MapProducer(ImmutableMap<K, Producer<V>> contributingMap)39 private MapProducer(ImmutableMap<K, Producer<V>> contributingMap) { 40 super(contributingMap); 41 } 42 43 /** Returns a new {@link Builder}. */ builder(int size)44 public static <K, V> Builder<K, V> builder(int size) { 45 return new Builder<>(size); 46 } 47 48 /** A builder for {@link MapProducer} */ 49 public static final class Builder<K, V> extends AbstractMapProducer.Builder<K, V, V> { Builder(int size)50 private Builder(int size) { 51 super(size); 52 } 53 54 @Override put(K key, Producer<V> producerOfValue)55 public Builder<K, V> put(K key, Producer<V> producerOfValue) { 56 super.put(key, producerOfValue); 57 return this; 58 } 59 60 @Override put(K key, Provider<V> providerOfValue)61 public Builder<K, V> put(K key, Provider<V> providerOfValue) { 62 super.put(key, providerOfValue); 63 return this; 64 } 65 66 /** 67 * Legacy javax version of the method to support libraries compiled with an older version of 68 * Dagger. Do not use directly. 69 */ 70 @Deprecated put(K key, javax.inject.Provider<V> providerOfValue)71 public Builder<K, V> put(K key, javax.inject.Provider<V> providerOfValue) { 72 return put(key, asDaggerProvider(providerOfValue)); 73 } 74 75 @Override putAll(Producer<Map<K, V>> mapProducer)76 public Builder<K, V> putAll(Producer<Map<K, V>> mapProducer) { 77 super.putAll(mapProducer); 78 return this; 79 } 80 81 /** Returns a new {@link MapProducer}. */ build()82 public MapProducer<K, V> build() { 83 return new MapProducer<>(mapBuilder.build()); 84 } 85 } 86 87 @Override compute()88 protected ListenableFuture<Map<K, V>> compute() { 89 final List<ListenableFuture<Map.Entry<K, V>>> listOfEntries = new ArrayList<>(); 90 for (final Entry<K, Producer<V>> entry : contributingMap().entrySet()) { 91 listOfEntries.add( 92 Futures.transform( 93 entry.getValue().get(), 94 new Function<V, Entry<K, V>>() { 95 @Override 96 public Entry<K, V> apply(V computedValue) { 97 return Maps.immutableEntry(entry.getKey(), computedValue); 98 } 99 }, 100 directExecutor())); 101 } 102 103 return Futures.transform( 104 Futures.allAsList(listOfEntries), 105 new Function<List<Map.Entry<K, V>>, Map<K, V>>() { 106 @Override 107 public Map<K, V> apply(List<Map.Entry<K, V>> entries) { 108 return ImmutableMap.copyOf(entries); 109 } 110 }, 111 directExecutor()); 112 } 113 } 114