/**
* 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 org.apache.metamodel.util;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
/**
* Various utility methods pertaining to date handling
*/
public final class DateUtils {
public static final long MILLISECONDS_PER_SECOND = 1000;
public static final long MILLISECONDS_PER_MINUTE = MILLISECONDS_PER_SECOND * 60;
public static final long MILLISECONDS_PER_HOUR = MILLISECONDS_PER_MINUTE * 60;
public static final long MILLISECONDS_PER_DAY = MILLISECONDS_PER_HOUR * 24;
private DateUtils() {
// prevent instantiation
}
public static Date get(int year, Month month, int dayOfMonth) {
Calendar c = createCalendar();
c.set(Calendar.YEAR, year);
c.set(Calendar.MONTH, month.getCalendarConstant());
c.set(Calendar.DAY_OF_MONTH, dayOfMonth);
c.set(Calendar.HOUR, 0);
c.set(Calendar.MINUTE, 0);
c.set(Calendar.SECOND, 0);
c.set(Calendar.MILLISECOND, 0);
c.set(Calendar.AM_PM, 0);
return c.getTime();
}
public static Date get(Date date) {
Calendar c = Calendar.getInstance();
c.setTime(date);
c.set(Calendar.HOUR, 0);
c.set(Calendar.MINUTE, 0);
c.set(Calendar.SECOND, 0);
c.set(Calendar.MILLISECOND, 0);
c.set(Calendar.AM_PM, 0);
return c.getTime();
}
public static Date get(Date originalDate, int daysDiff) {
long millis = originalDate.getTime();
long diff = daysDiff * MILLISECONDS_PER_DAY;
millis = millis + diff;
return new Date(millis);
}
public static int getYear(Date date) {
Calendar cal = createCalendar();
cal.setTime(date);
return cal.get(Calendar.YEAR);
}
public static Month getMonth(Date date) {
Calendar cal = createCalendar();
cal.setTime(date);
int monthConstant = cal.get(Calendar.MONTH);
return Month.getByCalendarConstant(monthConstant);
}
public static Weekday getWeekday(Date date) {
Calendar cal = createCalendar();
cal.setTime(date);
int weekdayConstant = cal.get(Calendar.DAY_OF_WEEK);
return Weekday.getByCalendarConstant(weekdayConstant);
}
public static int getDayOfMonth(Date date) {
Calendar cal = createCalendar();
cal.setTime(date);
return cal.get(Calendar.DAY_OF_MONTH);
}
public static Calendar createCalendar() {
Calendar c = Calendar.getInstance();
c.setTimeInMillis(0l);
return c;
}
public static DateFormat createDateFormat() {
return createDateFormat("yyyy-MM-dd HH:mm:ss");
}
public static DateFormat createDateFormat(String datePattern) {
SimpleDateFormat dateFormat = new SimpleDateFormat(datePattern);
return dateFormat;
}
}