1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17
18 package org.apache.commons.lang3.function;
19
20 import java.util.Objects;
21 import java.util.function.BiConsumer;
22
23 /**
24 * A functional interface like {@link BiConsumer} that declares a {@link Throwable}.
25 *
26 * @param <T> Consumed type 1.
27 * @param <U> Consumed type 2.
28 * @param <E> The kind of thrown exception or error.
29 * @since 3.11
30 */
31 @FunctionalInterface
32 public interface FailableBiConsumer<T, U, E extends Throwable> {
33
34 /** NOP singleton */
35 @SuppressWarnings("rawtypes")
36 FailableBiConsumer NOP = (t, u) -> {/* NOP */};
37
38 /**
39 * Returns The NOP singleton.
40 *
41 * @param <T> Consumed type 1.
42 * @param <U> Consumed type 2.
43 * @param <E> The kind of thrown exception or error.
44 * @return The NOP singleton.
45 */
46 @SuppressWarnings("unchecked")
47 static <T, U, E extends Throwable> FailableBiConsumer<T, U, E> nop() {
48 return NOP;
49 }
50
51 /**
52 * Accepts the given arguments.
53 *
54 * @param t the first parameter for the consumable to accept
55 * @param u the second parameter for the consumable to accept
56 * @throws E Thrown when the consumer fails.
57 */
58 void accept(T t, U u) throws E;
59
60 /**
61 * Returns a composed {@link FailableBiConsumer} like {@link BiConsumer#andThen(BiConsumer)}.
62 *
63 * @param after the operation to perform after this one.
64 * @return a composed {@link FailableBiConsumer} like {@link BiConsumer#andThen(BiConsumer)}.
65 * @throws NullPointerException when {@code after} is null.
66 */
67 default FailableBiConsumer<T, U, E> andThen(final FailableBiConsumer<? super T, ? super U, E> after) {
68 Objects.requireNonNull(after);
69 return (t, u) -> {
70 accept(t, u);
71 after.accept(t, u);
72 };
73 }
74 }