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Commons Net example source code file (FTPTimestampParserImpl.java)

This example Commons Net source code file (FTPTimestampParserImpl.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Commons Net tags/keywords

calendar, calendar, configurable, date, dateformat, ftptimestampparserimpl, parseexception, parseposition, parseposition, simpledateformat, simpledateformat, string, string, text, timezone, util

The Commons Net FTPTimestampParserImpl.java source code

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.commons.net.ftp.parser;

import java.text.DateFormatSymbols;
import java.text.ParseException;
import java.text.ParsePosition;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.TimeZone;

import org.apache.commons.net.ftp.Configurable;
import org.apache.commons.net.ftp.FTPClientConfig;

/**
 * Default implementation of the {@link  FTPTimestampParser  FTPTimestampParser}
 * interface also implements the {@link  org.apache.commons.net.ftp.Configurable  Configurable}
 * interface to allow the parsing to be configured from the outside.
 *
 * @see ConfigurableFTPFileEntryParserImpl
 * @since 1.4
 */
public class FTPTimestampParserImpl implements
        FTPTimestampParser, Configurable
{


    private SimpleDateFormat defaultDateFormat;
    private SimpleDateFormat recentDateFormat;
    private boolean lenientFutureDates = false;


    /**
     * The only constructor for this class.
     */
    public FTPTimestampParserImpl() {
        setDefaultDateFormat(DEFAULT_SDF);
        setRecentDateFormat(DEFAULT_RECENT_SDF);
    }

    /**
     * Implements the one {@link  FTPTimestampParser#parseTimestamp(String)  method}
     * in the {@link  FTPTimestampParser  FTPTimestampParser} interface
     * according to this algorithm:
     *
     * If the recentDateFormat member has been defined, try to parse the
     * supplied string with that.  If that parse fails, or if the recentDateFormat
     * member has not been defined, attempt to parse with the defaultDateFormat
     * member.  If that fails, throw a ParseException.
     *
     * This method allows a {@link Calendar} instance to be passed in which represents the
     * current (system) time.
     *
     * @see org.apache.commons.net.ftp.parser.FTPTimestampParser#parseTimestamp(java.lang.String)
     *
     * @param timestampStr The timestamp to be parsed
     */
    public Calendar parseTimestamp(String timestampStr) throws ParseException {
        Calendar now = Calendar.getInstance();
        return parseTimestamp(timestampStr, now);
    }

    /**
     * Implements the one {@link  FTPTimestampParser#parseTimestamp(String)  method}
     * in the {@link  FTPTimestampParser  FTPTimestampParser} interface
     * according to this algorithm:
     *
     * If the recentDateFormat member has been defined, try to parse the
     * supplied string with that.  If that parse fails, or if the recentDateFormat
     * member has not been defined, attempt to parse with the defaultDateFormat
     * member.  If that fails, throw a ParseException.
     *
     * @see org.apache.commons.net.ftp.parser.FTPTimestampParser#parseTimestamp(java.lang.String)
     * @param timestampStr The timestamp to be parsed
     * @param serverTime The current time for the server
     * @since 1.5
     */
    public Calendar parseTimestamp(String timestampStr, Calendar serverTime) throws ParseException {
        Calendar now = (Calendar) serverTime.clone();// Copy this, because we may change it
        now.setTimeZone(this.getServerTimeZone());
        Calendar working = (Calendar) now.clone();
        working.setTimeZone(getServerTimeZone()); // is this needed?
        ParsePosition pp = new ParsePosition(0);

        Date parsed = null;
        if (recentDateFormat != null) {
            if (lenientFutureDates) {
                // add a day to "now" so that "slop" doesn't cause a date
                // slightly in the future to roll back a full year.  (Bug 35181 => NET-83)
                now.add(Calendar.DATE, 1);
            }
            parsed = recentDateFormat.parse(timestampStr, pp);
        }
        if (parsed != null && pp.getIndex() == timestampStr.length())
        {
            working.setTime(parsed);
            working.set(Calendar.YEAR, now.get(Calendar.YEAR));

            if (working.after(now)) {
                working.add(Calendar.YEAR, -1);
            }
        } else {
            // Temporarily add the current year to the short date time
            // to cope with short-date leap year strings.
            // e.g. Java's DateFormatter will assume that "Feb 29 12:00" refers to
            // Feb 29 1970 (an invalid date) rather than a potentially valid leap year date.
            // This is pretty bad hack to work around the deficiencies of the JDK date/time classes.
            if (recentDateFormat != null) {
                pp = new ParsePosition(0);
                int year = now.get(Calendar.YEAR);
                String timeStampStrPlusYear = timestampStr + " " + year;
                SimpleDateFormat hackFormatter = new SimpleDateFormat(recentDateFormat.toPattern() + " yyyy",
                        recentDateFormat.getDateFormatSymbols());
                hackFormatter.setLenient(false);
                hackFormatter.setTimeZone(recentDateFormat.getTimeZone());
                parsed = hackFormatter.parse(timeStampStrPlusYear, pp);
            }
            if (parsed != null && pp.getIndex() == timestampStr.length() + 5) {
                working.setTime(parsed);
            }
            else {
                pp = new ParsePosition(0);
                parsed = defaultDateFormat.parse(timestampStr, pp);
                // note, length checks are mandatory for us since
                // SimpleDateFormat methods will succeed if less than
                // full string is matched.  They will also accept,
                // despite "leniency" setting, a two-digit number as
                // a valid year (e.g. 22:04 will parse as 22 A.D.)
                // so could mistakenly confuse an hour with a year,
                // if we don't insist on full length parsing.
                if (parsed != null && pp.getIndex() == timestampStr.length()) {
                    working.setTime(parsed);
                } else {
                    throw new ParseException(
                            "Timestamp could not be parsed with older or recent DateFormat",
                            pp.getErrorIndex());
                }
            }
        }
        return working;
    }

    /**
     * @return Returns the defaultDateFormat.
     */
    public SimpleDateFormat getDefaultDateFormat() {
        return defaultDateFormat;
    }
    /**
     * @return Returns the defaultDateFormat pattern string.
     */
    public String getDefaultDateFormatString() {
        return defaultDateFormat.toPattern();
    }
    /**
     * @param defaultDateFormat The defaultDateFormat to be set.
     */
    private void setDefaultDateFormat(String format) {
        if (format != null) {
            this.defaultDateFormat = new SimpleDateFormat(format);
            this.defaultDateFormat.setLenient(false);
        }
    }
    /**
     * @return Returns the recentDateFormat.
     */
    public SimpleDateFormat getRecentDateFormat() {
        return recentDateFormat;
    }
    /**
     * @return Returns the recentDateFormat.
     */
    public String getRecentDateFormatString() {
        return recentDateFormat.toPattern();
    }
    /**
     * @param recentDateFormat The recentDateFormat to set.
     */
    private void setRecentDateFormat(String format) {
        if (format != null) {
            this.recentDateFormat = new SimpleDateFormat(format);
            this.recentDateFormat.setLenient(false);
        }
    }

    /**
     * @return returns an array of 12 strings representing the short
     * month names used by this parse.
     */
    public String[] getShortMonths() {
        return defaultDateFormat.getDateFormatSymbols().getShortMonths();
    }


    /**
     * @return Returns the serverTimeZone used by this parser.
     */
    public TimeZone getServerTimeZone() {
        return this.defaultDateFormat.getTimeZone();
    }
    /**
     * sets a TimeZone represented by the supplied ID string into all
     * of the parsers used by this server.
     * @param serverTimeZone Time Id java.util.TimeZone id used by
     * the ftp server.  If null the client's local time zone is assumed.
     */
    private void setServerTimeZone(String serverTimeZoneId) {
        TimeZone serverTimeZone = TimeZone.getDefault();
        if (serverTimeZoneId != null) {
            serverTimeZone = TimeZone.getTimeZone(serverTimeZoneId);
        }
        this.defaultDateFormat.setTimeZone(serverTimeZone);
        if (this.recentDateFormat != null) {
            this.recentDateFormat.setTimeZone(serverTimeZone);
        }
    }

    /**
     * Implementation of the {@link  Configurable  Configurable}
     * interface. Configures this <code>FTPTimestampParser according
     * to the following logic:
     * <p>
     * Set up the {@link  FTPClientConfig#setDefaultDateFormatStr(java.lang.String) defaultDateFormat}
     * and optionally the {@link  FTPClientConfig#setRecentDateFormatStr(String) recentDateFormat}
     * to values supplied in the config based on month names configured as follows:
     * </p>

    * <li>If a {@link FTPClientConfig#setShortMonthNames(String) shortMonthString} * has been supplied in the <code>config, use that to parse parse timestamps. * <li>Otherwise, if a {@link FTPClientConfig#setServerLanguageCode(String) serverLanguageCode} * has been supplied in the <code>config, use the month names represented * by that {@link FTPClientConfig#lookupDateFormatSymbols(String) language} * to parse timestamps.</li> * <li>otherwise use default English month names * </ul>

    * Finally if a {@link org.apache.commons.net.ftp.FTPClientConfig#setServerTimeZoneId(String) serverTimeZoneId} * has been supplied via the config, set that into all date formats that have * been configured. * </p> */ public void configure(FTPClientConfig config) { DateFormatSymbols dfs = null; String languageCode = config.getServerLanguageCode(); String shortmonths = config.getShortMonthNames(); if (shortmonths != null) { dfs = FTPClientConfig.getDateFormatSymbols(shortmonths); } else if (languageCode != null) { dfs = FTPClientConfig.lookupDateFormatSymbols(languageCode); } else { dfs = FTPClientConfig.lookupDateFormatSymbols("en"); } String recentFormatString = config.getRecentDateFormatStr(); if (recentFormatString == null) { this.recentDateFormat = null; } else { this.recentDateFormat = new SimpleDateFormat(recentFormatString, dfs); this.recentDateFormat.setLenient(false); } String defaultFormatString = config.getDefaultDateFormatStr(); if (defaultFormatString == null) { throw new IllegalArgumentException("defaultFormatString cannot be null"); } this.defaultDateFormat = new SimpleDateFormat(defaultFormatString, dfs); this.defaultDateFormat.setLenient(false); setServerTimeZone(config.getServerTimeZoneId()); this.lenientFutureDates = config.isLenientFutureDates(); } /** * @return Returns the lenientFutureDates. */ boolean isLenientFutureDates() { return lenientFutureDates; } /** * @param lenientFutureDates The lenientFutureDates to set. */ void setLenientFutureDates(boolean lenientFutureDates) { this.lenientFutureDates = lenientFutureDates; } }

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