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.vfs2.function;
19
20 import java.util.Objects;
21
22 import org.apache.commons.vfs2.FileSystemException;
23
24 /**
25 * A {@link java.util.function.Consumer} that throws {@link FileSystemException}.
26 *
27 * @param <T> the type of the input to the operation
28 *
29 * @since 2.5.0
30 */
31 @FunctionalInterface
32 public interface VfsConsumer<T> {
33
34 /**
35 * Performs this operation on the given argument.
36 *
37 * @param t the input argument
38 * @throws FileSystemException Thrown when VFS detects an error.
39 */
40 void accept(T t) throws FileSystemException;
41
42 /**
43 * Returns a composed {@code Consumer} that performs, in sequence, this operation followed by the {@code after}
44 * operation. If performing either operation throws an exception, it is relayed to the caller of the composed
45 * operation. If performing this operation throws an exception, the {@code after} operation will not be performed.
46 *
47 * @param after the operation to perform after this operation
48 * @return a composed {@code Consumer} that performs in sequence this operation followed by the {@code after}
49 * operation
50 * @throws NullPointerException if {@code after} is null
51 */
52 default VfsConsumer<T> andThen(final VfsConsumer<? super T> after) {
53 Objects.requireNonNull(after);
54 return (final T t) -> {
55 accept(t);
56 after.accept(t);
57 };
58 }
59 }