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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  
18  package org.apache.commons.net.ftp.parser;
19  
20  import org.apache.commons.net.ftp.FTPFile;
21  import org.apache.commons.net.ftp.FTPFileEntryParser;
22  import org.apache.commons.net.ftp.FTPFileEntryParserImpl;
23  
24  /**
25   * This implementation allows to pack some FileEntryParsers together
26   * and handle the case where to returned dirstyle isnt clearly defined.
27   * The matching parser will be cached.
28   * If the cached parser wont match due to the server changed the dirstyle,
29   * a new matching parser will be searched.
30   *
31   * @author Mario Ivankovits <mario@ops.co.at>
32   */
33  public class CompositeFileEntryParser extends FTPFileEntryParserImpl
34  {
35      private final FTPFileEntryParser[] ftpFileEntryParsers;
36      private FTPFileEntryParser cachedFtpFileEntryParser;
37  
38      public CompositeFileEntryParser(FTPFileEntryParser[] ftpFileEntryParsers)
39      {
40          super();
41  
42          this.cachedFtpFileEntryParser = null;
43          this.ftpFileEntryParsers = ftpFileEntryParsers;
44      }
45  
46  //    @Override
47      public FTPFile parseFTPEntry(String listEntry)
48      {
49          if (cachedFtpFileEntryParser != null)
50          {
51              FTPFile matched = cachedFtpFileEntryParser.parseFTPEntry(listEntry);
52              if (matched != null)
53              {
54                  return matched;
55              }
56          }
57          else
58          {
59              for (FTPFileEntryParser ftpFileEntryParser : ftpFileEntryParsers)
60              {
61                  FTPFile matched = ftpFileEntryParser.parseFTPEntry(listEntry);
62                  if (matched != null)
63                  {
64                      cachedFtpFileEntryParser = ftpFileEntryParser;
65                      return matched;
66                  }
67              }
68          }
69          return null;
70      }
71  }