    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 *      https://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 and handle the case where the returned dir style isn't clearly defined. The matching parser
    026 * will be cached. If the cached parser won't match due to the server changed the dir style, a new matching parser will be searched.
    027 */
    028public class CompositeFileEntryParser extends FTPFileEntryParserImpl {
    029    private final FTPFileEntryParser[] ftpFileEntryParsers;
    030    private FTPFileEntryParser cachedFtpFileEntryParser;
    031
    032    /**
    033     * Constructs a new instance.
    034     *
    035     * @param ftpFileEntryParsers An array of FTPFileEntryParser.
    036     */
    037    public CompositeFileEntryParser(final FTPFileEntryParser[] ftpFileEntryParsers) {
    038        this.cachedFtpFileEntryParser = null;
    039        this.ftpFileEntryParsers = ftpFileEntryParsers;
    040    }
    041
    042    @Override
    043    public FTPFile parseFTPEntry(final String listEntry) {
    044        if (cachedFtpFileEntryParser != null) {
    045            return cachedFtpFileEntryParser.parseFTPEntry(listEntry);
    046        }
    047        for (final FTPFileEntryParser ftpFileEntryParser : ftpFileEntryParsers) {
    048            final FTPFile matched = ftpFileEntryParser.parseFTPEntry(listEntry);
    049            if (matched != null) {
    050                cachedFtpFileEntryParser = ftpFileEntryParser;
    051                return matched;
    052            }
    053        }
    054        return null;
    055    }
    056}