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
018package org.apache.commons.net.ftp.parser;
019
020import org.apache.commons.net.ftp.FTPFile;
021import org.apache.commons.net.ftp.FTPFileEntryParser;
022import 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 */
033public 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//    @Override
047    public FTPFile parseFTPEntry(String listEntry)
048    {
049        if (cachedFtpFileEntryParser != null)
050        {
051            FTPFile matched = cachedFtpFileEntryParser.parseFTPEntry(listEntry);
052            if (matched != null)
053            {
054                return matched;
055            }
056        }
057        else
058        {
059            for (FTPFileEntryParser ftpFileEntryParser : ftpFileEntryParsers)
060            {
061                FTPFile matched = ftpFileEntryParser.parseFTPEntry(listEntry);
062                if (matched != null)
063                {
064                    cachedFtpFileEntryParser = ftpFileEntryParser;
065                    return matched;
066                }
067            }
068        }
069        return null;
070    }
071}