1 package org.codehaus.mojo.jaxb2.shared.filters.pattern;
2
3 /*
4 * Licensed to the Apache Software Foundation (ASF) under one
5 * or more contributor license agreements. See the NOTICE file
6 * distributed with this work for additional information
7 * regarding copyright ownership. The ASF licenses this file
8 * to you under the Apache License, Version 2.0 (the
9 * "License"); you may not use this file except in compliance
10 * with the License. You may obtain a copy of the License at
11 *
12 * http://www.apache.org/licenses/LICENSE-2.0
13 *
14 * Unless required by applicable law or agreed to in writing,
15 * software distributed under the License is distributed on an
16 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
17 * KIND, either express or implied. See the License for the
18 * specific language governing permissions and limitations
19 * under the License.
20 */
21
22 import org.codehaus.mojo.jaxb2.shared.Validate;
23 import org.codehaus.mojo.jaxb2.shared.filters.AbstractFilter;
24 import org.codehaus.mojo.jaxb2.shared.filters.Filter;
25
26 import java.io.File;
27 import java.io.FileFilter;
28
29 /**
30 * Filter implementation adapting a FileFilter instance to the Filter interface.
31 * Delegates the {@link #onCandidate(File)} call to the supplied {@link FileFilter} delegate.
32 *
33 * @author <a href="mailto:lj@jguru.se">Lennart Jörelid</a>, jGuru Europe AB
34 * @since 2.3
35 */
36 public class FileFilterAdapter extends AbstractFilter<File> implements Filter<File>, FileFilter {
37
38 // Internal state
39 private FileFilter delegate;
40
41 /**
42 * Compound constructor, creating a FileFilterAdapter using the supplied {@link FileFilter} to determine if
43 * candidate Files should be accepted.
44 *
45 * @param delegate The delegate FileFilter.
46 */
47 public FileFilterAdapter(final FileFilter delegate) {
48 setDelegate(delegate);
49 }
50
51 /**
52 * {@inheritDoc}
53 */
54 @Override
55 public boolean isInitialized() {
56 return super.isInitialized() && delegate != null;
57 }
58
59 /**
60 * Assigns the supplied FileFilter delegate.
61 *
62 * @param delegate A non-null FileFilter instance.
63 */
64 public void setDelegate(final FileFilter delegate) {
65
66 // Check sanity
67 Validate.notNull(delegate, "delegate");
68
69 // Assign internal state
70 this.delegate = delegate;
71 }
72
73 /**
74 * {@inheritDoc}
75 */
76 @Override
77 protected boolean onCandidate(final File nonNullCandidate) {
78 return delegate.accept(nonNullCandidate);
79 }
80 }