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 package org.apache.commons.vfs2;
18
19 import java.util.Objects;
20
21 /**
22 * Inverts file inclusion of a delegate FileSelector, folder traversal is delegated.
23 *
24 * @since 2.2
25 */
26 public class InvertIncludeFileSelector implements FileSelector {
27
28 private final FileSelector delegateFileSelector;
29
30 /**
31 * Constructs a new instance.
32 *
33 * @param delegateFileSelector Delegate to this FileSelector.
34 */
35 public InvertIncludeFileSelector(final FileSelector delegateFileSelector) {
36 this.delegateFileSelector = Objects.requireNonNull(delegateFileSelector, "delegateFileSelector");
37 }
38
39 /**
40 * Inverts the result of calling {@link #includeFile(FileSelectInfo)} on the delegate.
41 */
42 @Override
43 public boolean includeFile(final FileSelectInfo fileInfo) throws Exception {
44 return !delegateFileSelector.includeFile(fileInfo);
45 }
46
47 /**
48 * Calls {@link #traverseDescendents(FileSelectInfo)} on the delegate.
49 */
50 @Override
51 public boolean traverseDescendents(final FileSelectInfo fileInfo) throws Exception {
52 return delegateFileSelector.traverseDescendants(fileInfo);
53 }
54
55 }