| /* |
| * Copyright (C) 2013 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.codegen.base; |
| |
| import java.util.Map; |
| import java.util.function.Function; |
| |
| /** General utilities for the annotation processor. */ |
| public final class Util { |
| |
| /** |
| * A version of {@link Map#computeIfAbsent(Object, Function)} that allows {@code mappingFunction} |
| * to update {@code map}. |
| */ |
| public static <K, V> V reentrantComputeIfAbsent( |
| Map<K, V> map, K key, Function<? super K, ? extends V> mappingFunction) { |
| V value = map.get(key); |
| if (value == null) { |
| value = mappingFunction.apply(key); |
| if (value != null) { |
| map.put(key, value); |
| } |
| } |
| return value; |
| } |
| |
| private Util() {} |
| } |