    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 java.util.Calendar;
    021
    022import org.apache.commons.net.ftp.FTPFile;
    023
    024/**
    025 * Parser for the Connect Enterprise Unix FTP Server From Sterling Commerce. Here is a sample of the sort of output line this parser processes:
    026 *
    027 * <pre>
    028 * "-C--E-----FTP B QUA1I1      18128       41 Aug 12 13:56 QUADTEST"
    029 * </pre>
    030 * <p>
    031 * Note: EnterpriseUnixFTPEntryParser can only be instantiated through the DefaultFTPParserFactory by classname. It will not be chosen by the autodetection
    032 * scheme.
    033 * </p>
    034 *
    035 * @see org.apache.commons.net.ftp.FTPFileEntryParser FTPFileEntryParser (for usage instructions)
    036 * @see org.apache.commons.net.ftp.parser.DefaultFTPFileEntryParserFactory
    037 */
    038public class EnterpriseUnixFTPEntryParser extends RegexFTPFileEntryParserImpl {
    039
    040    /**
    041     * months abbreviations looked for by this parser. Also used to determine <b>which</b> month has been matched by the parser.
    042     */
    043    private static final String MONTHS = "(Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec)";
    044
    045    /**
    046     * this is the regular expression used by this parser.
    047     */
    048    private static final String REGEX = "(([\\-]|[A-Z])([\\-]|[A-Z])([\\-]|[A-Z])([\\-]|[A-Z])([\\-]|[A-Z])"
    049            + "([\\-]|[A-Z])([\\-]|[A-Z])([\\-]|[A-Z])([\\-]|[A-Z])([\\-]|[A-Z]))" + "(\\S*)\\s*" // 12
    050            + "(\\S+)\\s*" // 13
    051            + "(\\S*)\\s*" // 14 user
    052            + "(\\d*)\\s*" // 15 group
    053            + "(\\d*)\\s*" // 16 filesize
    054            + MONTHS // 17 month
    055            + "\\s*" // TODO should the space be optional?
    056            // TODO \\d* should be \\d? surely ? Otherwise 01111 is allowed
    057            + "((?:[012]\\d*)|(?:3[01]))\\s*" // 18 date [012]\d* or 3[01]
    058            + "((\\d\\d\\d\\d)|((?:[01]\\d)|(?:2[0123])):([012345]\\d))\\s"
    059            // 20 \d\d\d\d = year OR
    060            // 21 [01]\d or 2[0123] hour + ':'
    061            // 22 [012345]\d = minute
    062            + "(\\S*)(\\s*.*)"; // 23 name
    063
    064    /**
    065     * The sole constructor for a EnterpriseUnixFTPEntryParser object.
    066     *
    067     */
    068    public EnterpriseUnixFTPEntryParser() {
    069        super(REGEX);
    070    }
    071
    072    /**
    073     * Parses a line of a unix FTP server file listing and converts it into a usable format in the form of an <code> FTPFile </code> instance. If the file
    074     * listing line doesn't describe a file, <code> null </code> is returned, otherwise a <code> FTPFile </code> instance representing the files in the
    075     * directory is returned.
    076     *
    077     * @param entry A line of text from the file listing
    078     * @return An FTPFile instance corresponding to the supplied entry
    079     */
    080    @Override
    081    public FTPFile parseFTPEntry(final String entry) {
    082
    083        final FTPFile file = new FTPFile();
    084        file.setRawListing(entry);
    085
    086        if (matches(entry)) {
    087            final String usr = group(14);
    088            final String grp = group(15);
    089            final String filesize = group(16);
    090            final String mo = group(17);
    091            final String da = group(18);
    092            final String yr = group(20);
    093            final String hr = group(21);
    094            final String min = group(22);
    095            final String name = group(23);
    096
    097            file.setType(FTPFile.FILE_TYPE);
    098            file.setUser(usr);
    099            file.setGroup(grp);
    100            try {
    101                file.setSize(Long.parseLong(filesize));
    102            } catch (final NumberFormatException e) {
    103                // intentionally do nothing
    104            }
    105
    106            final Calendar cal = Calendar.getInstance();
    107            cal.set(Calendar.MILLISECOND, 0);
    108            cal.set(Calendar.SECOND, 0);
    109            cal.set(Calendar.MINUTE, 0);
    110            cal.set(Calendar.HOUR_OF_DAY, 0);
    111
    112            final int pos = MONTHS.indexOf(mo);
    113            final int month = pos / 4;
    114            final int missingUnit; // the first missing unit
    115            try {
    116
    117                if (yr != null) {
    118                    // it's a year; there are no hours and minutes
    119                    cal.set(Calendar.YEAR, Integer.parseInt(yr));
    120                    missingUnit = Calendar.HOUR_OF_DAY;
    121                } else {
    122                    // it must be hour/minute, or we wouldn't have matched
    123                    missingUnit = Calendar.SECOND;
    124                    int year = cal.get(Calendar.YEAR);
    125
    126                    // if the month we're reading is greater than now, it must
    127                    // be last year
    128                    if (cal.get(Calendar.MONTH) < month) {
    129                        year--;
    130                    }
    131                    cal.set(Calendar.YEAR, year);
    132                    cal.set(Calendar.HOUR_OF_DAY, Integer.parseInt(hr));
    133                    cal.set(Calendar.MINUTE, Integer.parseInt(min));
    134                }
    135                cal.set(Calendar.MONTH, month);
    136                cal.set(Calendar.DAY_OF_MONTH, Integer.parseInt(da));
    137                cal.clear(missingUnit);
    138                file.setTimestamp(cal);
    139            } catch (final NumberFormatException e) {
    140                // do nothing, date will be uninitialized
    141            }
    142            file.setName(name);
    143
    144            return file;
    145        }
    146        return null;
    147    }
    148}