AbstractNileDate.java

/*
 * Copyright (c) 2007-present, Stephen Colebourne & Michael Nascimento Santos
 *
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 *    may be used to endorse or promote products derived from this software
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package org.threeten.extra.chrono;

import java.time.temporal.ValueRange;

/**
 * A date in one of the Nile river calendar systems.
 *
 * <h3>Implementation Requirements</h3>
 * Implementations must be immutable and thread-safe.
 */
abstract class AbstractNileDate
        extends AbstractDate {

    /**
     * Creates an instance.
     */
    AbstractNileDate() {
    }

    //-----------------------------------------------------------------------
    abstract int getEpochDayDifference();

    @Override
    int getDayOfYear() {
        return (getMonth() - 1) * 30 + getDayOfMonth();
    }

    @Override
    AbstractDate withDayOfYear(int value) {
        return resolvePrevious(getProlepticYear(), ((value - 1) / 30) + 1, ((value - 1) % 30) + 1);
    }

    @Override
    int lengthOfYearInMonths() {
        return 13;
    }

    @Override
    ValueRange rangeAlignedWeekOfMonth() {
        return ValueRange.of(1, getMonth() == 13 ? 1 : 5);
    }

    //-----------------------------------------------------------------------
    /**
     * Returns the length of the month represented by this date.
     * <p>
     * This returns the length of the month in days.
     * Months 1 to 12 have 30 days. Month 13 has 5 or 6 days.
     *
     * @return the length of the month in days, from 5 to 30
     */
    @Override
    public int lengthOfMonth() {
        if (getMonth() == 13) {
            return (isLeapYear() ? 6 : 5);
        }
        return 30;
    }

    @Override
    public long toEpochDay() {
        long year = (long) getProlepticYear();
        long calendarEpochDay = ((year - 1) * 365) + Math.floorDiv(year, 4) + (getDayOfYear() - 1);
        return calendarEpochDay - getEpochDayDifference();
    }

}