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 * https://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 and handle the case where the returned dir style isn't clearly defined. The matching parser
26 * will be cached. If the cached parser won't match due to the server changed the dir style, a new matching parser will be searched.
27 */
28 public class CompositeFileEntryParser extends FTPFileEntryParserImpl {
29 private final FTPFileEntryParser[] ftpFileEntryParsers;
30 private FTPFileEntryParser cachedFtpFileEntryParser;
31
32 /**
33 * Constructs a new instance.
34 *
35 * @param ftpFileEntryParsers An array of FTPFileEntryParser.
36 */
37 public CompositeFileEntryParser(final FTPFileEntryParser[] ftpFileEntryParsers) {
38 this.cachedFtpFileEntryParser = null;
39 this.ftpFileEntryParsers = ftpFileEntryParsers;
40 }
41
42 @Override
43 public FTPFile parseFTPEntry(final String listEntry) {
44 if (cachedFtpFileEntryParser != null) {
45 return cachedFtpFileEntryParser.parseFTPEntry(listEntry);
46 }
47 for (final FTPFileEntryParser ftpFileEntryParser : ftpFileEntryParsers) {
48 final FTPFile matched = ftpFileEntryParser.parseFTPEntry(listEntry);
49 if (matched != null) {
50 cachedFtpFileEntryParser = ftpFileEntryParser;
51 return matched;
52 }
53 }
54 return null;
55 }
56 }