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Groovy: A powerful, dynamic language for the JVM
/*
* 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);
}
}