43 lines
1.2 KiB
Java
43 lines
1.2 KiB
Java
/*
|
|
* 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() {}
|
|
}
|