/*
* Copyright (c) 2002-2015, JIDE Software Inc. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code 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
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*/
package jidefx.utils;
import java.util.Calendar;
import java.util.Date;
import java.util.List;
/**
* {@code DateUtils} contains many useful methods related to Date and Calendar.
*/
public class DateUtils {
private static final long DAY_IN_MS = 24 * 60 * 60 * 1000;
/**
* Checks if the calendar object is same date as today.
*
* @param cal the calendar object
* @return true if the calendar object is the same date as today.
*/
public static boolean isToday(Calendar cal) {
Calendar today = Calendar.getInstance();
return today.get(Calendar.YEAR) == cal.get(Calendar.YEAR) && today.get(Calendar.DAY_OF_YEAR) == cal.get(Calendar.DAY_OF_YEAR);
}
/**
* Checks if the calendar object is same week as today.
*
* @param cal the calendar object
* @return true if the calendar object is the same week as today.
*/
public static boolean isThisWeek(Calendar cal) {
Calendar today = Calendar.getInstance();
return today.get(Calendar.YEAR) == cal.get(Calendar.YEAR) && today.get(Calendar.WEEK_OF_YEAR) == cal.get(Calendar.WEEK_OF_YEAR);
}
/**
* Checks if the calendar object is same month as today.
*
* @param cal the calendar object
* @return true if the calendar object is the same month as today.
*/
public static boolean isThisMonth(Calendar cal) {
Calendar today = Calendar.getInstance();
return today.get(Calendar.YEAR) == cal.get(Calendar.YEAR) && today.get(Calendar.MONTH) == cal.get(Calendar.MONTH);
}
/**
* Checks if the calendar object is same quarter as today.
*
* @param cal the calendar object
* @return true if the calendar object is the same quarter as today.
*/
public static boolean isThisQuarter(Calendar cal) {
Calendar today = Calendar.getInstance();
return today.get(Calendar.YEAR) == cal.get(Calendar.YEAR) && today.get(Calendar.MONTH) / 3 == cal.get(Calendar.MONTH) / 3;
}
/**
* Checks if the calendar object is same year as today.
*
* @param cal the calendar object
* @return true if the calendar object is the same year as today.
*/
public static boolean isThisYear(Calendar cal) {
Calendar today = Calendar.getInstance();
return today.get(Calendar.YEAR) == cal.get(Calendar.YEAR);
}
/**
* Checks if the calendar object is same date as yesterday.
*
* @param cal the calendar object
* @return true if the calendar object is the same date as yesterday.
*/
public static boolean isYesterday(Calendar cal) {
Calendar yesterday = adjustDate(Calendar.getInstance(), -1);
return yesterday.get(Calendar.YEAR) == cal.get(Calendar.YEAR) && yesterday.get(Calendar.DAY_OF_YEAR) == cal.get(Calendar.DAY_OF_YEAR);
}
/**
* Checks if the calendar object is last week.
*
* @param cal the calendar object
* @return true if the calendar object is last week.
*/
public static boolean isLastWeek(Calendar cal) {
Calendar lastWeek = adjustDate(Calendar.getInstance(), -7);
return lastWeek.get(Calendar.YEAR) == cal.get(Calendar.YEAR) && lastWeek.get(Calendar.WEEK_OF_YEAR) == cal.get(Calendar.WEEK_OF_YEAR);
}
/**
* Checks if the calendar object is last month.
*
* @param cal the calendar object
* @return true if the calendar object is last month.
*/
public static boolean isLastMonth(Calendar cal) {
Calendar today = Calendar.getInstance();
int thisMonth = today.get(Calendar.MONTH);
if (thisMonth > 1) {
return today.get(Calendar.YEAR) == cal.get(Calendar.YEAR) && thisMonth - 1 == cal.get(Calendar.MONTH);
}
else {
return today.get(Calendar.YEAR) - 1 == cal.get(Calendar.YEAR) && today.getActualMaximum(Calendar.MONTH) == cal.get(Calendar.MONTH);
}
}
/**
* Checks if the calendar object is last quarter.
*
* @param cal the calendar object
* @return true if the calendar object is last quarter.
*/
public static boolean isLastQuarter(Calendar cal) {
Calendar today = Calendar.getInstance();
int thisQuarter = today.get(Calendar.MONTH) / 3;
if (thisQuarter > 1) {
return today.get(Calendar.YEAR) == cal.get(Calendar.YEAR) && thisQuarter - 1 == cal.get(Calendar.MONTH) / 3;
}
else {
return today.get(Calendar.YEAR) - 1 == cal.get(Calendar.YEAR) && today.getActualMaximum(Calendar.MONTH) / 3 == cal.get(Calendar.MONTH) / 3;
}
}
/**
* Checks if the calendar object is last year.
*
* @param cal the calendar object
* @return true if the calendar object is last year.
*/
public static boolean isLastYear(Calendar cal) {
Calendar today = Calendar.getInstance();
return today.get(Calendar.YEAR) - 1 == cal.get(Calendar.YEAR);
}
/**
* Checks if the calendar object is same date as tomorrow.
*
* @param cal the calendar object
* @return true if the calendar object is the same date as tomorrow.
*/
public static boolean isTomorrow(Calendar cal) {
Calendar tomorrow = adjustDate(Calendar.getInstance(), 1);
return tomorrow.get(Calendar.YEAR) == cal.get(Calendar.YEAR) && tomorrow.get(Calendar.DAY_OF_YEAR) == cal.get(Calendar.DAY_OF_YEAR);
}
/**
* Checks if the calendar object is next week.
*
* @param cal the calendar object
* @return true if the calendar object is next week.
*/
public static boolean isNextWeek(Calendar cal) {
Calendar nextWeek = adjustDate(Calendar.getInstance(), 7);
return nextWeek.get(Calendar.YEAR) == cal.get(Calendar.YEAR) && nextWeek.get(Calendar.WEEK_OF_YEAR) == cal.get(Calendar.WEEK_OF_YEAR);
}
/**
* Checks if the calendar object is next month.
*
* @param cal the calendar object
* @return true if the calendar object is next month.
*/
public static boolean isNextMonth(Calendar cal) {
Calendar today = Calendar.getInstance();
int thisMonth = today.get(Calendar.MONTH);
if (thisMonth < today.getActualMaximum(Calendar.MONTH)) {
return today.get(Calendar.YEAR) == cal.get(Calendar.YEAR) && thisMonth + 1 == cal.get(Calendar.MONTH);
}
else {
return today.get(Calendar.YEAR) + 1 == cal.get(Calendar.YEAR) && today.getMinimum(Calendar.MONTH) == cal.get(Calendar.MONTH);
}
}
/**
* Checks if the calendar object is next quarter.
*
* @param cal the calendar object
* @return true if the calendar object is next quarter.
*/
public static boolean isNextQuarter(Calendar cal) {
Calendar today = Calendar.getInstance();
int thisQuarter = today.get(Calendar.MONTH) / 3;
if (thisQuarter < today.getActualMaximum(Calendar.MONTH) / 3) {
return today.get(Calendar.YEAR) == cal.get(Calendar.YEAR) && thisQuarter + 1 == cal.get(Calendar.MONTH) / 3;
}
else {
return today.get(Calendar.YEAR) + 1 == cal.get(Calendar.YEAR) && today.getActualMinimum(Calendar.MONTH) / 3 == cal.get(Calendar.MONTH) / 3;
}
}
/**
* Checks if the calendar object is next year.
*
* @param cal the calendar object
* @return true if the calendar object is next year.
*/
public static boolean isNextYear(Calendar cal) {
Calendar today = Calendar.getInstance();
return today.get(Calendar.YEAR) + 1 == cal.get(Calendar.YEAR);
}
/**
* Checks if the calendar object is in the specified month, regardless of the year.
*
* @param cal the calendar object.
* @param month the month, starting from 0 for January. You can use the value defined in Calendar such as
* Calendar.JANUARY, Calendar.FEBRUARY, etc.
* @return true if the calendar object is the specified month.
*/
public static boolean isAtMonth(Calendar cal, int month) {
return cal.get(Calendar.MONTH) == month;
}
/**
* Checks if the calendar object is in the specified quarter, regardless of the year.
*
* @param cal the calendar object.
* @param quarter the quarter, starting from 1 for the first quarter (including January, February, and March).
* @return true if the calendar object is the specified quarter.
*/
public static boolean isAtQuarter(Calendar cal, int quarter) {
return cal.get(Calendar.MONTH) / 3 + 1 == quarter;
}
/**
* Adjusts the Calendar to several days before or after the current date.
*
* @param calendar the Calendar object to be adjusted.
* @param differenceInDay the difference in days. It accepts both position and negative number.
* @return the calendar after the adjustment. It should always be the same instance as the calendar parameter.
*/
public static Calendar adjustDate(Calendar calendar, int differenceInDay) {
calendar.setTimeInMillis(calendar.getTimeInMillis() + DAY_IN_MS * differenceInDay);
return calendar;
}
/**
* Returns the minimum Date in the Date list.
*
* @param dates the list of Date to calculate the minimum.
* @return the minimum date in the Date list.
* @deprecated replaced by {@link #minDates(java.util.List)} to comply with the new compilation regulation. We have
* to delete the min(List) in releases earlier than 2.9.4 due to the same reason.
*/
@Deprecated
public static Date min(List<Date> dates) {
return minDates(dates);
}
/**
* Returns the maximum Date in the Date list.
*
* @param dates the list of Date to calculate the maximum.
* @return the maximum date in the Date list.
* @deprecated replaced by {@link #maxDates(java.util.List)} to comply with the new compilation regulation. We have
* to delete the max(List) in releases earlier than 2.9.4 due to the same reason.
*/
@Deprecated
public static Date max(List<Date> dates) {
return maxDates(dates);
}
/**
* Returns the minimum Date in the Date list.
*
* @param dates the list of Date to calculate the minimum.
* @return the minimum date in the Date list.
*/
public static Date minDates(List<Date> dates) {
long min = Long.MAX_VALUE;
Date minDate = null;
for (Date value : dates) {
long v = value.getTime();
if (v < min) {
min = v;
minDate = value;
}
}
return minDate;
}
/**
* Returns the maximum Date in the Date list.
*
* @param dates the list of Date to calculate the maximum.
* @return the maximum date in the Date list.
*/
public static Date maxDates(List<Date> dates) {
long max = Long.MIN_VALUE;
Date maxDate = null;
for (Date value : dates) {
long v = value.getTime();
if (v > max) {
max = v;
maxDate = value;
}
}
return maxDate;
}
/**
* Returns the minimum Calendar in the Calendar list.
*
* @param calendars the list of Calendar to calculate the minimum.
* @return the minimum calendar in the Calendar list.
*/
public static Calendar minCalendars(List<Calendar> calendars) {
long min = Long.MAX_VALUE;
Calendar minCalendar = null;
for (Calendar value : calendars) {
long v = value.getTimeInMillis();
if (v < min) {
min = v;
minCalendar = value;
}
}
return minCalendar;
}
/**
* Returns the maximum Calendar in the Calendar list.
*
* @param calendars the list of Calendar to calculate the maximum.
* @return the maximum calendar in the Calendar list.
*/
public static Calendar maxCalendars(List<Calendar> calendars) {
long max = Long.MIN_VALUE;
Calendar maxCalendar = null;
for (Calendar value : calendars) {
long v = value.getTimeInMillis();
if (v > max) {
max = v;
maxCalendar = value;
}
}
return maxCalendar;
}
// public static void main(String[] args) {
// Calendar cal = Calendar.getInstance();
// for (int i = 0; i < 400; i++) {
// System.out.println(ObjectConverterManager.toString(cal));
// System.out.printf("isToday: %b, isThisWeek: %b, isThisMonth: %b, isThisQuarter: %b, isThisYear: %b\n", isToday(cal), isThisWeek(cal), isThisMonth(cal), isThisQuarter(cal), isThisYear(cal));
// System.out.printf("isYesterday: %b, isLastWeek: %b, isLastMonth: %b, isLastQuarter: %b, isLastYear: %b\n", isYesterday(cal), isLastWeek(cal), isLastMonth(cal), isLastQuarter(cal), isLastYear(cal));
// System.out.printf("isTomorrow: %b, isNextWeek: %b, isNextMonth: %b, isNextQuarter: %b, isNextYear: %b\n", isTomorrow(cal), isNextWeek(cal), isNextMonth(cal), isNextQuarter(cal), isNextYear(cal));
// adjustDate(cal, -1);
// }
// cal = Calendar.getInstance();
// for (int i = 0; i < 400; i++) {
// System.out.println(ObjectConverterManager.toString(cal));
// System.out.printf("isToday: %b, isThisWeek: %b, isThisMonth: %b, isThisQuarter: %b, isThisYear: %b\n", isToday(cal), isThisWeek(cal), isThisMonth(cal), isThisQuarter(cal), isThisYear(cal));
// System.out.printf("isYesterday: %b, isLastWeek: %b, isLastMonth: %b, isLastQuarter: %b, isLastYear: %b\n", isYesterday(cal), isLastWeek(cal), isLastMonth(cal), isLastQuarter(cal), isLastYear(cal));
// System.out.printf("isTomorrow: %b, isNextWeek: %b, isNextMonth: %b, isNextQuarter: %b, isNextYear: %b\n", isTomorrow(cal), isNextWeek(cal), isNextMonth(cal), isNextQuarter(cal), isNextYear(cal));
// adjustDate(cal, 1);
// }
// }
}