    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    }