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/*
 *  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 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:
 * 
 * use (groovy.time.TimeCategory) {
 *     // application on numbers:
 *     println 1.minute.from.now
 *     println 10.hours.ago
 *
 *     // application on dates
 *     def someDate = new Date()
 *     println someDate - 3.months
 * }
 * 
* * @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. Recommended that you use {@code TimeZone.getDefault()} instead. * * @param self a Date * @return the TimeZone */ @Deprecated 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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