59 lines
1.6 KiB
Java
59 lines
1.6 KiB
Java
/*
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* Copyright (C) 2017 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 java.util.Collections;
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import java.util.Map;
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/**
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* A fluent builder class that returns a {@link Map}. Used in component implementations where a map
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* must be created in one fluent statement for inlined request fulfillments.
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*/
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public final class MapBuilder<K, V> {
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private final Map<K, V> contributions;
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private MapBuilder(int size) {
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contributions = newLinkedHashMapWithExpectedSize(size);
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}
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/**
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* Creates a new {@link MapBuilder} with {@code size} elements.
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*/
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public static <K, V> MapBuilder<K, V> newMapBuilder(int size) {
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return new MapBuilder<>(size);
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}
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public MapBuilder<K, V> put(K key, V value) {
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contributions.put(key, value);
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return this;
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}
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public MapBuilder<K, V> putAll(Map<K, V> map) {
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contributions.putAll(map);
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return this;
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}
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public Map<K, V> build() {
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if (contributions.isEmpty()) {
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return Collections.emptyMap();
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}
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return Collections.unmodifiableMap(contributions);
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}
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}
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