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/*
* Copyright (C) 2017 The Dagger Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package dagger.internal;
import static dagger.internal.DaggerCollections.newLinkedHashMapWithExpectedSize;
import java.util.Collections;
import java.util.Map;
/**
* A fluent builder class that returns a {@link Map}. Used in component implementations where a map
* must be created in one fluent statement for inlined request fulfillments.
*/
public final class MapBuilder<K, V> {
private final Map<K, V> contributions;
private MapBuilder(int size) {
contributions = newLinkedHashMapWithExpectedSize(size);
}
/**
* Creates a new {@link MapBuilder} with {@code size} elements.
*/
public static <K, V> MapBuilder<K, V> newMapBuilder(int size) {
return new MapBuilder<>(size);
}
public MapBuilder<K, V> put(K key, V value) {
contributions.put(key, value);
return this;
}
public MapBuilder<K, V> putAll(Map<K, V> map) {
contributions.putAll(map);
return this;
}
public Map<K, V> build() {
if (contributions.isEmpty()) {
return Collections.emptyMap();
}
return Collections.unmodifiableMap(contributions);
}
}
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