99 lines
3.5 KiB
Java
99 lines
3.5 KiB
Java
package com.philliphsu.clock2;
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import android.content.Context;
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import android.support.annotation.VisibleForTesting;
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import android.util.Log;
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import com.philliphsu.clock2.util.AlarmUtils;
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import java.text.DateFormatSymbols;
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import java.util.Arrays;
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/**
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* Created by Phillip Hsu on 5/30/2016.
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*/
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public final class DaysOfWeek {
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private static final String TAG = "DaysOfWeek";
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// DAY_OF_WEEK constants in Calendar class not zero-based
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public static final int SUNDAY = 0;
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public static final int MONDAY = 1;
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public static final int TUESDAY = 2;
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public static final int WEDNESDAY = 3;
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public static final int THURSDAY = 4;
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public static final int FRIDAY = 5;
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public static final int SATURDAY = 6;
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public static final int NUM_DAYS = 7;
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private static final int[] DAYS = new int[NUM_DAYS];
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private static final String[] LABELS = new DateFormatSymbols().getShortWeekdays();
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private static DaysOfWeek sInstance;
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private static int sLastPreferredFirstDay;
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public static DaysOfWeek getInstance(Context context) {
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int preferredFirstDay = AlarmUtils.firstDayOfWeek(context);
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if (sInstance == null || preferredFirstDay != sLastPreferredFirstDay) {
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sLastPreferredFirstDay = preferredFirstDay;
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sInstance = new DaysOfWeek(preferredFirstDay);
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}
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Log.d(TAG, sInstance.toString());
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return sInstance;
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}
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/**
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* @param weekday the zero-based index of the week day you would like to get the label for.
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*/
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public static String getLabel(int weekday) {
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// This array was returned from DateFormatSymbols.getShortWeekdays().
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// We are supposed to use the constants in the Calendar class as indices, but the previous
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// implementation of this method used our own zero-based indices. For backward compatibility,
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// we add one to the index passed in to match up with the values of the Calendar constants.
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return LABELS[weekday + 1];
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}
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/** @return the week day at {@code position} within the user-defined week */
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public int weekDayAt(int position) {
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if (position < 0 || position > 6)
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throw new ArrayIndexOutOfBoundsException("Ordinal day out of range");
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return DAYS[position];
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}
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/** @return the position of {@code weekDay} within the user-defined week */
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public int positionOf(int weekDay) {
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if (weekDay < SUNDAY || weekDay > SATURDAY)
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throw new ArrayIndexOutOfBoundsException("Week day ("+weekDay+") out of range");
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for (int i = 0; i < DAYS.length; i++)
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if (DAYS[i] == weekDay)
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return i;
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return -1;
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}
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@Override
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public String toString() {
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return "DaysOfWeek{"
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+ "DAYS=" + Arrays.toString(DAYS)
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+ "}";
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}
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@VisibleForTesting
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DaysOfWeek(int firstDayOfWeek) {
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if (firstDayOfWeek != SATURDAY && firstDayOfWeek != SUNDAY && firstDayOfWeek != MONDAY)
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throw new IllegalArgumentException("Invalid first day of week: " + firstDayOfWeek);
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DAYS[0] = firstDayOfWeek;
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for (int i = 1; i < 7; i++) {
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if (firstDayOfWeek == SATURDAY) {
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DAYS[i] = i - 1;
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} else if (firstDayOfWeek == MONDAY) {
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if (i == 6) {
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DAYS[i] = SUNDAY;
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} else {
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DAYS[i] = i + 1;
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}
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} else {
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DAYS[i] = i;
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}
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}
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}
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}
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