    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 */
    031public class CompositeFileEntryParser extends FTPFileEntryParserImpl
    032{
    033    private final FTPFileEntryParser[] ftpFileEntryParsers;
    034    private FTPFileEntryParser cachedFtpFileEntryParser;
    035
    036    public CompositeFileEntryParser(final FTPFileEntryParser[] ftpFileEntryParsers)
    037    {
    038        this.cachedFtpFileEntryParser = null;
    039        this.ftpFileEntryParsers = ftpFileEntryParsers;
    040    }
    041
    042    @Override
    043    public FTPFile parseFTPEntry(final String listEntry)
    044    {
    045        if (cachedFtpFileEntryParser != null)
    046        {
    047            final FTPFile matched = cachedFtpFileEntryParser.parseFTPEntry(listEntry);
    048            if (matched != null)
    049            {
    050                return matched;
    051            }
    052        }
    053        else
    054        {
    055            for (final FTPFileEntryParser ftpFileEntryParser : ftpFileEntryParsers)
    056            {
    057                final FTPFile matched = ftpFileEntryParser.parseFTPEntry(listEntry);
    058                if (matched != null)
    059                {
    060                    cachedFtpFileEntryParser = ftpFileEntryParser;
    061                    return matched;
    062                }
    063            }
    064        }
    065        return null;
    066    }
    067}