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    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 (int iterParser=0; iterParser < ftpFileEntryParsers.length; iterParser++)
059            {
060                FTPFileEntryParser ftpFileEntryParser = ftpFileEntryParsers[iterParser];
061
062                FTPFile matched = ftpFileEntryParser.parseFTPEntry(listEntry);
063                if (matched != null)
064                {
065                    cachedFtpFileEntryParser = ftpFileEntryParser;
066                    return matched;
067                }
068            }
069        }
070        return null;
071    }
072}