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.io.function;
19
20 import java.io.IOException;
21 import java.io.UncheckedIOException;
22 import java.util.Objects;
23 import java.util.function.BiConsumer;
24
25 /**
26 * Like {@link BiConsumer} but throws {@link IOException}.
27 *
28 * @param <T> the type of the first argument to the operation
29 * @param <U> the type of the second argument to the operation
30 * @see BiConsumer
31 * @since 2.12.0
32 */
33 @FunctionalInterface
34 public interface IOBiConsumer<T, U> {
35
36 /**
37 * Returns the no-op singleton.
38 *
39 * @param <T> the type of the first argument to the operation
40 * @param <U> the type of the second argument to the operation
41 * @return The no-op singleton.
42 */
43 @SuppressWarnings("unchecked")
44 static <T, U> IOBiConsumer<T, U> noop() {
45 return Constants.IO_BI_CONSUMER;
46 }
47
48 /**
49 * Performs this operation on the given arguments.
50 *
51 * @param t the first input argument
52 * @param u the second input argument
53 * @throws IOException if an I/O error occurs.
54 */
55 void accept(T t, U u) throws IOException;
56
57 /**
58 * Creates a composed {@link IOBiConsumer} that performs, in sequence, this operation followed by the {@code after}
59 * operation. If performing either operation throws an exception, it is relayed to the caller of the composed operation.
60 * If performing this operation throws an exception, the {@code after} operation will not be performed.
61 *
62 * @param after the operation to perform after this operation
63 * @return a composed {@link IOBiConsumer} that performs in sequence this operation followed by the {@code after}
64 * operation
65 * @throws NullPointerException if {@code after} is null
66 */
67 default IOBiConsumer<T, U> andThen(final IOBiConsumer<? super T, ? super U> after) {
68 Objects.requireNonNull(after);
69 return (t, u) -> {
70 accept(t, u);
71 after.accept(t, u);
72 };
73 }
74
75 /**
76 * Creates a {@link BiConsumer} for this instance that throws {@link UncheckedIOException} instead of
77 * {@link IOException}.
78 *
79 * @return an UncheckedIOException BiConsumer.
80 * @throws UncheckedIOException Wraps an {@link IOException}.
81 * @since 2.12.0
82 */
83 default BiConsumer<T, U> asBiConsumer() {
84 return (t, u) -> Uncheck.accept(this, t, u);
85 }
86
87 }