View Javadoc

1   /*****************************************************************
2    * Licensed to the Apache Software Foundation (ASF) under one   *
3    * or more contributor license agreements.  See the NOTICE file *
4    * distributed with this work for additional information        *
5    * regarding copyright ownership.  The ASF licenses this file   *
6    * to you under the Apache License, Version 2.0 (the            *
7    * "License"); you may not use this file except in compliance   *
8    * with the License.  You may obtain a copy of the License at   *
9    *                                                              *
10   *   http://www.apache.org/licenses/LICENSE-2.0                 *
11   *                                                              *
12   * Unless required by applicable law or agreed to in writing,   *
13   * software distributed under the License is distributed on an  *
14   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY       *
15   * KIND, either express or implied.  See the License for the    *
16   * specific language governing permissions and limitations      *
17   * under the License.                                           *
18   ****************************************************************/
19  
20  package org.apache.james.mailrepository.filepair;
21  
22  import java.io.File;
23  import java.io.FilenameFilter;
24  
25  /***
26   * This filters files based on the extension and is tailored to provide
27   * backwards compatibility of the numbered repositories that Avalon does.
28   *
29   */
30  public class NumberedRepositoryFileFilter implements FilenameFilter {
31      private String postfix;
32      private String prefix;
33  
34      public NumberedRepositoryFileFilter(final String extension) {
35          postfix = extension;
36          prefix = "." + RepositoryManager.getName();
37      }
38  
39      public boolean accept(final File file, final String name) {
40          //System.out.println("check: " + name);
41          //System.out.println("post: " + postfix);
42          if (!name.endsWith(postfix)) {
43              return false;
44          }
45          //Look for a couple of digits next
46          int pos = name.length() - postfix.length();
47          //We have to find at least one digit... if not then this isn't what we want
48          if (!Character.isDigit(name.charAt(pos - 1))) {
49              return false;
50          }
51          pos--;
52          while (pos >= 1 && Character.isDigit(name.charAt(pos - 1))) {
53              //System.out.println("back one");
54              pos--;
55          }
56          //System.out.println("sub: " + name.substring(0, pos));
57          //Now want to check that we match the rest
58          return name.substring(0, pos).endsWith(prefix);
59      }
60  }
61  
62