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/*
* Copyright (C) 2013 The Android Open Source Project
*
* Licensed 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 com.android.datetimepicker;
import android.os.Build;
import android.text.format.Time;
import java.util.Calendar;
/**
* Utility helper functions for time and date pickers.
*/
public class Utils {
public static final int MONDAY_BEFORE_JULIAN_EPOCH = Time.EPOCH_JULIAN_DAY - 3;
static final String SHARED_PREFS_NAME = "com.android.calendar_preferences";
public static boolean isJellybeanOrLater() {
return Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN;
}
public static int getDaysInMonth(int month, int year) {
switch (month) {
case Calendar.JANUARY:
case Calendar.MARCH:
case Calendar.MAY:
case Calendar.JULY:
case Calendar.AUGUST:
case Calendar.OCTOBER:
case Calendar.DECEMBER:
return 31;
case Calendar.APRIL:
case Calendar.JUNE:
case Calendar.SEPTEMBER:
case Calendar.NOVEMBER:
return 30;
case Calendar.FEBRUARY:
return (year % 4 == 0) ? 29 : 28;
default:
throw new IllegalArgumentException("Invalid Month");
}
}
/**
* Takes a number of weeks since the epoch and calculates the Julian day of
* the Monday for that week.
*
* This assumes that the week containing the {@link Time#EPOCH_JULIAN_DAY}
* is considered week 0. It returns the Julian day for the Monday
* {@code week} weeks after the Monday of the week containing the epoch.
*
* @param week Number of weeks since the epoch
* @return The julian day for the Monday of the given week since the epoch
*/
public static int getJulianMondayFromWeeksSinceEpoch(int week) {
return MONDAY_BEFORE_JULIAN_EPOCH + week * 7;
}
/**
* Returns the week since {@link Time#EPOCH_JULIAN_DAY} (Jan 1, 1970)
* adjusted for first day of week.
*
* This takes a julian day and the week start day and calculates which
* week since {@link Time#EPOCH_JULIAN_DAY} that day occurs in, starting
* at 0. *Do not* use this to compute the ISO week number for the year.
*
* @param julianDay The julian day to calculate the week number for
* @param firstDayOfWeek Which week day is the first day of the week,
* see {@link Time#SUNDAY}
* @return Weeks since the epoch
*/
public static int getWeeksSinceEpochFromJulianDay(int julianDay, int firstDayOfWeek) {
int diff = Time.THURSDAY - firstDayOfWeek;
if (diff < 0) {
diff += 7;
}
int refDay = Time.EPOCH_JULIAN_DAY - diff;
return (julianDay - refDay) / 7;
}
}
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