131 lines
4.0 KiB
Java
131 lines
4.0 KiB
Java
/*
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* Copyright (c) 2019 Hemanth Savarala.
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*
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* Licensed under the GNU General Public License v3
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*
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* This is free software: you can redistribute it and/or modify it under
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* the terms of the GNU General Public License as published by
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* the Free Software Foundation either version 3 of the License, or (at your option) any later version.
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*
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* This software is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
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* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU General Public License for more details.
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*/
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package code.name.monkey.retromusic.util;
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import java.util.Calendar;
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import java.util.GregorianCalendar;
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/**
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* @author Eugene Cheung (arkon)
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*/
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public class CalendarUtil {
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private static final long MS_PER_MINUTE = 60 * 1000;
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private static final long MS_PER_DAY = 24 * 60 * MS_PER_MINUTE;
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private Calendar calendar;
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public CalendarUtil() {
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this.calendar = Calendar.getInstance();
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}
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/**
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* Returns the time elapsed so far today in milliseconds.
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*
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* @return Time elapsed today in milliseconds.
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*/
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public long getElapsedToday() {
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// Time elapsed so far today
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return (calendar.get(Calendar.HOUR_OF_DAY) * 60 + calendar.get(Calendar.MINUTE)) * MS_PER_MINUTE
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+ calendar.get(Calendar.SECOND) * 1000
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+ calendar.get(Calendar.MILLISECOND);
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}
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/**
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* Returns the time elapsed so far this week in milliseconds.
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*
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* @return Time elapsed this week in milliseconds.
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*/
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public long getElapsedWeek() {
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// Today + days passed this week
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long elapsed = getElapsedToday();
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final int passedWeekdays = calendar.get(Calendar.DAY_OF_WEEK) - 1 - calendar.getFirstDayOfWeek();
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if (passedWeekdays > 0) {
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elapsed += passedWeekdays * MS_PER_DAY;
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}
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return elapsed;
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}
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/**
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* Returns the time elapsed so far this month in milliseconds.
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*
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* @return Time elapsed this month in milliseconds.
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*/
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public long getElapsedMonth() {
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// Today + rest of this month
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return getElapsedToday() +
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((calendar.get(Calendar.DAY_OF_MONTH) - 1) * MS_PER_DAY);
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}
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/**
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* Returns the time elapsed so far this month and the last numMonths months in milliseconds.
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*
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* @param numMonths Additional number of months prior to the current month to calculate.
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* @return Time elapsed this month and the last numMonths months in milliseconds.
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*/
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public long getElapsedMonths(int numMonths) {
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// Today + rest of this month
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long elapsed = getElapsedMonth();
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// Previous numMonths months
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int month = calendar.get(Calendar.MONTH);
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int year = calendar.get(Calendar.YEAR);
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for (int i = 0; i < numMonths; i++) {
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month--;
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if (month < Calendar.JANUARY) {
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month = Calendar.DECEMBER;
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year--;
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}
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elapsed += getDaysInMonth(month) * MS_PER_DAY;
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}
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return elapsed;
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}
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/**
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* Returns the time elapsed so far this year in milliseconds.
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*
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* @return Time elapsed this year in milliseconds.
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*/
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public long getElapsedYear() {
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// Today + rest of this month + previous months until January
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long elapsed = getElapsedMonth();
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int month = calendar.get(Calendar.MONTH) - 1;
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int year = calendar.get(Calendar.YEAR);
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while (month > Calendar.JANUARY) {
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elapsed += getDaysInMonth(month) * MS_PER_DAY;
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month--;
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}
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return elapsed;
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}
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/**
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* Gets the number of days for the given month in the given year.
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*
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* @param month The month (1 - 12).
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* @return The days in that month/year.
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*/
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private int getDaysInMonth(int month) {
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final Calendar monthCal = new GregorianCalendar(calendar.get(Calendar.YEAR), month, 1);
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return monthCal.getActualMaximum(Calendar.DAY_OF_MONTH);
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}
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}
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