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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  public class CompositeFileEntryParser extends FTPFileEntryParserImpl
32  {
33      private final FTPFileEntryParser[] ftpFileEntryParsers;
34      private FTPFileEntryParser cachedFtpFileEntryParser;
35  
36      public CompositeFileEntryParser(FTPFileEntryParser[] ftpFileEntryParsers)
37      {
38          super();
39  
40          this.cachedFtpFileEntryParser = null;
41          this.ftpFileEntryParsers = ftpFileEntryParsers;
42      }
43  
44      @Override
45      public FTPFile parseFTPEntry(String listEntry)
46      {
47          if (cachedFtpFileEntryParser != null)
48          {
49              FTPFile matched = cachedFtpFileEntryParser.parseFTPEntry(listEntry);
50              if (matched != null)
51              {
52                  return matched;
53              }
54          }
55          else
56          {
57              for (FTPFileEntryParser ftpFileEntryParser : ftpFileEntryParsers)
58              {
59                  FTPFile matched = ftpFileEntryParser.parseFTPEntry(listEntry);
60                  if (matched != null)
61                  {
62                      cachedFtpFileEntryParser = ftpFileEntryParser;
63                      return matched;
64                  }
65              }
66          }
67          return null;
68      }
69  }