1 /************************************************************************
2 * Copyright (c) 2000-2006 The Apache Software Foundation. *
3 * All rights reserved. *
4 * ------------------------------------------------------------------- *
5 * Licensed under the Apache License, Version 2.0 (the "License"); you *
6 * may not use this file except in compliance with the License. You *
7 * 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 *
14 * implied. See the License for the specific language governing *
15 * permissions and limitations under the License. *
16 ***********************************************************************/
17
18 package org.apache.james.mailrepository.filepair;
19
20 import java.io.File;
21 import java.io.FilenameFilter;
22
23 /***
24 * This filters files based on the extension and is tailored to provide
25 * backwards compatibility of the numbered repositories that Avalon does.
26 *
27 */
28 public class NumberedRepositoryFileFilter implements FilenameFilter {
29 private String postfix;
30 private String prefix;
31
32 public NumberedRepositoryFileFilter(final String extension) {
33 postfix = extension;
34 prefix = "." + RepositoryManager.getName();
35 }
36
37 public boolean accept(final File file, final String name) {
38
39
40 if (!name.endsWith(postfix)) {
41 return false;
42 }
43
44 int pos = name.length() - postfix.length();
45
46 if (!Character.isDigit(name.charAt(pos - 1))) {
47 return false;
48 }
49 pos--;
50 while (pos >= 1 && Character.isDigit(name.charAt(pos - 1))) {
51
52 pos--;
53 }
54
55
56 return name.substring(0, pos).endsWith(prefix);
57 }
58 }
59
60