com.collabnet.ccf.core.utils.DateUtil.java Source code

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Here is the source code for com.collabnet.ccf.core.utils.DateUtil.java

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/*
 * Copyright 2009 CollabNet, Inc. ("CollabNet") Licensed 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 com.collabnet.ccf.core.utils;

import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.TimeZone;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import com.collabnet.ccf.core.ga.GenericArtifactHelper;

public class DateUtil {
    private static final DateFormat dateFormat = GenericArtifactHelper.df;
    private static final SimpleDateFormat qcDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    private static final Log log = LogFactory.getLog(DateUtil.class);
    public static final String GMT_TIME_ZONE_STRING = "GMT";

    /**
     * Converts the given Date object into another date object with the
     * specified time zone information.
     * 
     * @param date
     *            - The date that is to be converted to a different time zone.
     * @param toTimeZone
     *            - the time zone to which the date object should be converted.
     * @return the new Date object in the specified time zone.
     * @throws ParseException
     */
    public static Date convertDate(Date date, String toTimeZone) throws ParseException {
        Calendar cal = new GregorianCalendar(TimeZone.getTimeZone(toTimeZone));
        cal.setTime(date);
        DateFormat df = new SimpleDateFormat("EEE, d MMM yyyy HH:mm:ss.SSS Z");
        df.setCalendar(cal);
        return df.parse(df.format(cal.getTime()));
    }

    public static Date convertDateToTimeZone(Date date, String toTimeZone) {
        Calendar toCal = new GregorianCalendar(TimeZone.getTimeZone(toTimeZone));
        Calendar fromCal = new GregorianCalendar();
        fromCal.setTime(date);

        toCal.set(fromCal.get(Calendar.YEAR), fromCal.get(Calendar.MONTH), fromCal.get(Calendar.DAY_OF_MONTH),
                fromCal.get(Calendar.HOUR_OF_DAY), fromCal.get(Calendar.MINUTE), fromCal.get(Calendar.SECOND));
        toCal.set(Calendar.MILLISECOND, fromCal.get(Calendar.MILLISECOND));

        return toCal.getTime();
    }

    public static Date convertGMTToTimezoneAbsoluteDate(Date dateValue, String sourceSystemTimezone) {
        Calendar cal = new GregorianCalendar(TimeZone.getTimeZone(GMT_TIME_ZONE_STRING));
        cal.setLenient(false);
        cal.setTime(dateValue);
        Calendar newCal = new GregorianCalendar(TimeZone.getTimeZone(sourceSystemTimezone));
        newCal.set(cal.get(Calendar.YEAR), cal.get(Calendar.MONTH), cal.get(Calendar.DAY_OF_MONTH), 0, 0, 0);
        newCal.set(Calendar.MILLISECOND, 0);
        Date returnDate = newCal.getTime();
        return returnDate;
    }

    public static Date convertToGMTAbsoluteDate(Date dateValue, String sourceSystemTimezone) {
        Calendar cal = new GregorianCalendar(TimeZone.getTimeZone(sourceSystemTimezone));
        cal.setLenient(false);
        cal.setTime(dateValue);
        Calendar newCal = new GregorianCalendar(TimeZone.getTimeZone(GMT_TIME_ZONE_STRING));
        newCal.set(cal.get(Calendar.YEAR), cal.get(Calendar.MONTH), cal.get(Calendar.DAY_OF_MONTH), 0, 0, 0);
        newCal.set(Calendar.MILLISECOND, 0);
        Date returnDate = newCal.getTime();
        return returnDate;
    }

    /**
     * Formats the given java.util.Date object into the GenericArtifact
     * compatible date format String
     * 
     * @param date
     *            - The java.util.Date object that is to be formatted.
     * @return the formatted String in the GenericArtifact date format.
     */
    public static String format(Date date) {
        return format(date, dateFormat);
    }

    /**
     * Formats the incoming java.util.Date object into the QC specific format.
     * 
     * @param date
     *            - The Date object to be formatted in QC format.
     * @return the formatted date String
     */
    public static String formatQCDate(Date date) {
        return format(date, qcDateFormat);
    }

    public static boolean isAbsoluteDateInTimezone(Date date, String timeZone) {
        Calendar cal = new GregorianCalendar(TimeZone.getTimeZone(timeZone));
        cal.setLenient(false);
        cal.setTime(date);
        int hour = cal.get(Calendar.HOUR_OF_DAY);
        int minutes = cal.get(Calendar.MINUTE);
        int seconds = cal.get(Calendar.SECOND);
        int milliseconds = cal.get(Calendar.MILLISECOND);
        if (hour == 0 && minutes == 0 && seconds == 0 && milliseconds == 0) {
            return true;
        } else {
            return false;
        }
    }

    /**
     * Parses a date String that is in the GenericArtifact compatible format
     * into a java.util.Date object.
     * 
     * @param dateString
     *            - The date String in the GenerciArtifact compatible format.
     * @return The java.util.Date object parsed from the GenericArtifact
     *         compatible date format.
     */
    public static Date parse(String dateString) {
        return parse(dateString, dateFormat);
    }

    /**
     * Parses the QC specific date string into java.util.Date object
     * 
     * @param dateString
     *            - The date String in QC format
     * @return - The Date object parsed from the dateString
     */
    public static Date parseQCDate(String dateString) {
        return parse(dateString, qcDateFormat);
    }

    private static String format(Date date, DateFormat dateFormat) {
        return dateFormat.format(date);
    }

    private static Date parse(String dateString, DateFormat dateFormat) {
        try {
            return dateFormat.parse(dateString);
        } catch (ParseException e) {
            log.error("ParseException: " + e.getMessage());
        }
        return null;
    }
}