DateTimeGenerator.java

/*
 * Copyright 2005-2015 by BerryWorks Software, LLC. All rights reserved.
 *
 * This file is part of EDIReader. You may obtain a license for its use directly from
 * BerryWorks Software, and you may also choose to use this software under the terms of the
 * GPL version 3. Other products in the EDIReader software suite are available only by licensing
 * with BerryWorks. Only those files bearing the GPL statement below are available under the GPL.
 *
 * EDIReader is free software: you can redistribute it and/or modify it under the terms of the
 * GNU General Public License as published by the Free Software Foundation, either version 3 of
 * the License, or (at your option) any later version.
 *
 * EDIReader is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
 * even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along with EDIReader.  If not,
 * see <http://www.gnu.org/licenses/>.
 */

package com.berryworks.edireader.util;

import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;

/**
 * Represent the current date and time in the format used by
 * ANSI X12 and EDIFACT EDI standards.
 */
public class DateTimeGenerator {

    private static final ThreadLocal<DateFormat> yymmdd = new ThreadLocal<DateFormat>() {
        @Override
        protected DateFormat initialValue() {
            return new SimpleDateFormat("yyMMdd");
        }
    };
    private static final ThreadLocal<DateFormat> hhmm = new ThreadLocal<DateFormat>() {
        @Override
        protected DateFormat initialValue() {
            return new SimpleDateFormat("HHmm");
        }
    };

    private static String dateTestValue = null;
    private static String timeTestValue = null;

    /**
     * Generate the date and time in an yyMMdd delimiter HHmm format.
     *
     * @param delimiter char placed between day and time of day
     * @return String representation of date and time
     */
    public static String generate(char delimiter) {
        if (dateTestValue == null || timeTestValue == null) {
            Date now = new Date();
            return yymmdd.get().format(now) + delimiter + hhmm.get().format(now);
        } else {
            return dateTestValue + delimiter + timeTestValue;
        }
    }

    /**
     * Inject particular date and time values to use instead of
     * the current date and time.
     * <p>
     * This can be very useful in testing as a mean of allowing expected
     * results that are full repeatable.
     *
     * @param date specific value to use
     * @param time specific value to use
     */
    public static void setTestValues(String date, String time) {
        dateTestValue = date;
        timeTestValue = time;
    }
}