87 lines
2.7 KiB
Java
87 lines
2.7 KiB
Java
/*
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* Copyright (C) 2014 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.internal;
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import static dagger.internal.DaggerCollections.newLinkedHashMapWithExpectedSize;
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import static java.util.Collections.unmodifiableMap;
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import java.util.Collections;
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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 Factory} implementation used to implement {@link Map} bindings. This factory returns a
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* {@code Map<K, V>} when calling {@link #get} (as specified by {@link Factory}).
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*/
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public final class MapFactory<K, V> extends AbstractMapFactory<K, V, V> {
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private static final Provider<Map<Object, Object>> EMPTY =
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InstanceFactory.create(Collections.emptyMap());
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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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/** Returns a factory of an empty map. */
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@SuppressWarnings("unchecked") // safe contravariant cast
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public static <K, V> Provider<Map<K, V>> emptyMapProvider() {
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return (Provider<Map<K, V>>) (Provider) EMPTY;
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}
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private MapFactory(Map<K, Provider<V>> map) {
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super(map);
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}
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/**
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* Returns a {@code Map<K, V>} whose iteration order is that of the elements given by each of the
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* providers, which are invoked in the order given at creation.
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*/
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@Override
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public Map<K, V> get() {
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Map<K, V> result = newLinkedHashMapWithExpectedSize(contributingMap().size());
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for (Entry<K, Provider<V>> entry : contributingMap().entrySet()) {
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result.put(entry.getKey(), entry.getValue().get());
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}
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return unmodifiableMap(result);
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}
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/** A builder for {@link MapFactory}. */
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public static final class Builder<K, V> extends AbstractMapFactory.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, 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(Provider<Map<K, V>> mapFactory) {
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super.putAll(mapFactory);
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return this;
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}
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/** Returns a new {@link MapProviderFactory}. */
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public MapFactory<K, V> build() {
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return new MapFactory<>(map);
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}
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}
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}
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