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Groovy example source code file (TimeCategory.java)

This example Groovy source code file (TimeCategory.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 - Groovy tags/keywords

baseduration, calendar, date, date, datumdependentduration, duration, duration, integer, integer, timecategory, timeduration, timeduration, timezone, util

The Groovy TimeCategory.java source code

/*
 * Copyright 2003-2007 the original author or authors.
 *
 * 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 groovy.time;

import java.util.Calendar;
import java.util.Date;
import java.util.TimeZone;

/**
 * Apply a number of methods to allow convenient Date/Time manipulation,such as:
 * <p/>
 * <pre>
 * use ( TimeCategory ) {
 *     // application on numbers:
 *     println 1.minute.from.now
 *     println 10.hours.ago
 * <p/>
 *     // application on dates
 *     def someDate = new Date()
 *     println someDate - 3.months
 * }</pre>
 *
 * @see BaseDuration
 */
public class TimeCategory {
    /*
     * Methods to allow Date Duration arithmetic
     */

    public static Date plus(final Date date, final BaseDuration duration) {
        return duration.plus(date);
    }

    public static Date minus(final Date date, final BaseDuration duration) {
        final Calendar cal = Calendar.getInstance();

        cal.setTime(date);
        cal.add(Calendar.YEAR, -duration.getYears());
        cal.add(Calendar.MONTH, -duration.getMonths());
        cal.add(Calendar.DAY_OF_YEAR, -duration.getDays());
        cal.add(Calendar.HOUR_OF_DAY, -duration.getHours());
        cal.add(Calendar.MINUTE, -duration.getMinutes());
        cal.add(Calendar.SECOND, -duration.getSeconds());
        cal.add(Calendar.MILLISECOND, -duration.getMillis());

        return cal.getTime();
    }

    /**
     * Retrieves the default TimeZone for a date by using the default Locale
     * settings.
     *
     * @param self a Date
     * @return the TimeZone
     */
    public static TimeZone getTimeZone(Date self) {
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(self);
        return calendar.getTimeZone();
    }

    /**
     * Get the DST offset (if any) for the default locale and the given date.
     *
     * @param self a Date
     * @return the DST offset as a Duration.
     */
    public static Duration getDaylightSavingsOffset(Date self) {
        TimeZone timeZone = getTimeZone(self);
        int millis = (timeZone.useDaylightTime() && timeZone.inDaylightTime(self))
                ? timeZone.getDSTSavings() : 0;
        return new TimeDuration(0, 0, 0, millis);
    }

    public static Duration getDaylightSavingsOffset(BaseDuration self) {
        return getDaylightSavingsOffset(new Date(self.toMilliseconds() + 1));
    }

    /**
     * Return a Duration representing the DST difference (if any) between two
     * dates.  i.e. if one date is before the DST changeover, and the other
     * date is after, the resulting duration will represent the DST offset.
     *
     * @param self  a Date
     * @param other another Date
     * @return a Duration
     */
    public static Duration getRelativeDaylightSavingsOffset(Date self, Date other) {
        Duration d1 = getDaylightSavingsOffset(self);
        Duration d2 = getDaylightSavingsOffset(other);
        return new TimeDuration(0, 0, 0, (int) (d2.toMilliseconds() - d1.toMilliseconds()));
    }

    /**
     * Subtract one date from the other.
     *
     * @param lhs a Date
     * @param rhs another Date
     * @return a Duration
     */
    public static TimeDuration minus(final Date lhs, final Date rhs) {
        long milliseconds = lhs.getTime() - rhs.getTime();
        long days = milliseconds / (24 * 60 * 60 * 1000);
        milliseconds -= days * 24 * 60 * 60 * 1000;
        int hours = (int) (milliseconds / (60 * 60 * 1000));
        milliseconds -= hours * 60 * 60 * 1000;
        int minutes = (int) (milliseconds / (60 * 1000));
        milliseconds -= minutes * 60 * 1000;
        int seconds = (int) (milliseconds / 1000);
        milliseconds -= seconds * 1000;

        return new TimeDuration((int) days, hours, minutes, seconds, (int) milliseconds);
    }

    /*
    * Methods on Integer to implement 1.month, 4.years etc.
    */

    public static DatumDependentDuration getMonths(final Integer self) {
        return new DatumDependentDuration(0, self, 0, 0, 0, 0, 0);
    }

    public static DatumDependentDuration getMonth(final Integer self) {
        return getMonths(self);
    }

    public static DatumDependentDuration getYears(final Integer self) {
        return new DatumDependentDuration(self, 0, 0, 0, 0, 0, 0);
    }

    public static DatumDependentDuration getYear(final Integer self) {
        return getYears(self);
    }

    /*
    * Methods on Integer to implement 1.week, 4.days etc.
    */

    public static Duration getWeeks(final Integer self) {
        return new Duration(self * 7, 0, 0, 0, 0);
    }

    public static Duration getWeek(final Integer self) {
        return getWeeks(self);
    }

    public static Duration getDays(final Integer self) {
        return new Duration(self, 0, 0, 0, 0);
    }

    public static Duration getDay(final Integer self) {
        return getDays(self);
    }

    public static TimeDuration getHours(final Integer self) {
        return new TimeDuration(0, self, 0, 0, 0);
    }

    public static TimeDuration getHour(final Integer self) {
        return getHours(self);
    }

    public static TimeDuration getMinutes(final Integer self) {
        return new TimeDuration(0, 0, self, 0, 0);
    }

    public static TimeDuration getMinute(final Integer self) {
        return getMinutes(self);
    }

    public static TimeDuration getSeconds(final Integer self) {
        return new TimeDuration(0, 0, 0, self, 0);
    }

    public static TimeDuration getSecond(final Integer self) {
        return getSeconds(self);
    }

    public static TimeDuration getMilliseconds(final Integer self) {
        return new TimeDuration(0, 0, 0, 0, self);
    }

    public static TimeDuration getMillisecond(final Integer self) {
        return getMilliseconds(self);
    }
}

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