82 lines
3.0 KiB
Java
82 lines
3.0 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 dagger.internal.Preconditions.checkNotNull;
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import static java.util.Collections.unmodifiableMap;
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import java.util.LinkedHashMap;
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import java.util.Map;
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import javax.inject.Provider;
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/**
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* An {@code abstract} {@link Factory} implementation used to implement {@link Map} bindings.
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*
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* @param <K> the key type of the map that this provides
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* @param <V> the type that each contributing factory
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* @param <V2> the value type of the map that this provides
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*/
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abstract class AbstractMapFactory<K, V, V2> implements Factory<Map<K, V2>> {
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private final Map<K, Provider<V>> contributingMap;
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AbstractMapFactory(Map<K, Provider<V>> map) {
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this.contributingMap = unmodifiableMap(map);
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}
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/** The map of {@link Provider}s that contribute to this map binding. */
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final Map<K, Provider<V>> contributingMap() {
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return contributingMap;
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}
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/** A builder for {@link AbstractMapFactory}. */
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public abstract static class Builder<K, V, V2> {
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final LinkedHashMap<K, Provider<V>> map;
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Builder(int size) {
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this.map = newLinkedHashMapWithExpectedSize(size);
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}
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// Unfortunately, we cannot return a self-type here because a raw Provider type passed to one of
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// these methods affects the returned type of the method. The first put*() call erases the self
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// type to the "raw" self type, and the second erases the type to the upper bound
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// (AbstractMapFactory.Builder), which doesn't have a build() method.
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//
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// The methods are therefore not declared public so that each subtype will redeclare them and
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// expand their accessibility
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/** Associates {@code key} with {@code providerOfValue}. */
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Builder<K, V, V2> put(K key, Provider<V> providerOfValue) {
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map.put(checkNotNull(key, "key"), checkNotNull(providerOfValue, "provider"));
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return this;
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}
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Builder<K, V, V2> putAll(Provider<Map<K, V2>> mapOfProviders) {
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if (mapOfProviders instanceof DelegateFactory) {
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@SuppressWarnings("unchecked")
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DelegateFactory<Map<K, V2>> asDelegateFactory = (DelegateFactory) mapOfProviders;
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return putAll(asDelegateFactory.getDelegate());
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}
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@SuppressWarnings("unchecked")
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AbstractMapFactory<K, V, ?> asAbstractMapFactory =
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((AbstractMapFactory<K, V, ?>) (Provider) mapOfProviders);
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map.putAll(asAbstractMapFactory.contributingMap);
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return this;
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}
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}
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}
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