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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          //System.out.println("check: " + name);
39          //System.out.println("post: " + postfix);
40          if (!name.endsWith(postfix)) {
41              return false;
42          }
43          //Look for a couple of digits next
44          int pos = name.length() - postfix.length();
45          //We have to find at least one digit... if not then this isn't what we want
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              //System.out.println("back one");
52              pos--;
53          }
54          //System.out.println("sub: " + name.substring(0, pos));
55          //Now want to check that we match the rest
56          return name.substring(0, pos).endsWith(prefix);
57      }
58  }
59  
60