001    /*
002     * Licensed to the Apache Software Foundation (ASF) under one or more
003     * contributor license agreements.  See the NOTICE file distributed with
004     * this work for additional information regarding copyright ownership.
005     * The ASF licenses this file to You under the Apache License, Version 2.0
006     * (the "License"); you may not use this file except in compliance with
007     * the License.  You may obtain a copy of the License at
008     *
009     *      http://www.apache.org/licenses/LICENSE-2.0
010     *
011     * Unless required by applicable law or agreed to in writing, software
012     * distributed under the License is distributed on an "AS IS" BASIS,
013     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014     * See the License for the specific language governing permissions and
015     * limitations under the License.
016     */
017    
018    package org.apache.commons.net.ftp.parser;
019    
020    import org.apache.commons.net.ftp.FTPFile;
021    import org.apache.commons.net.ftp.FTPFileEntryParser;
022    import org.apache.commons.net.ftp.FTPFileEntryParserImpl;
023    
024    /**
025     * This implementation allows to pack some FileEntryParsers together
026     * and handle the case where to returned dirstyle isnt clearly defined.
027     * The matching parser will be cached.
028     * If the cached parser wont match due to the server changed the dirstyle,
029     * a new matching parser will be searched.
030     *
031     * @author Mario Ivankovits <mario@ops.co.at>
032     */
033    public class CompositeFileEntryParser extends FTPFileEntryParserImpl
034    {
035        private final FTPFileEntryParser[] ftpFileEntryParsers;
036        private FTPFileEntryParser cachedFtpFileEntryParser;
037    
038        public CompositeFileEntryParser(FTPFileEntryParser[] ftpFileEntryParsers)
039        {
040            super();
041    
042            this.cachedFtpFileEntryParser = null;
043            this.ftpFileEntryParsers = ftpFileEntryParsers;
044        }
045    
046        public FTPFile parseFTPEntry(String listEntry)
047        {
048            if (cachedFtpFileEntryParser != null)
049            {
050                FTPFile matched = cachedFtpFileEntryParser.parseFTPEntry(listEntry);
051                if (matched != null)
052                {
053                    return matched;
054                }
055            }
056            else
057            {
058                for (FTPFileEntryParser ftpFileEntryParser : ftpFileEntryParsers)
059                {
060                    FTPFile matched = ftpFileEntryParser.parseFTPEntry(listEntry);
061                    if (matched != null)
062                    {
063                        cachedFtpFileEntryParser = ftpFileEntryParser;
064                        return matched;
065                    }
066                }
067            }
068            return null;
069        }
070    }