/*
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* @copyright (c) 2016, Philipp Thürwächter & Pattrick Hüper
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* @copyright (c) 2007-present, Stephen Colebourne & Michael Nascimento Santos
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* @license BSD-3-Clause (see LICENSE in the root directory of this source tree)
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*/
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import { requireNonNull } from '../assert';
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import { IllegalStateException } from '../errors';
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import { TemporalAdjuster } from './TemporalAdjuster';
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import { ChronoField } from '../temporal/ChronoField';
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import { ChronoUnit } from '../temporal/ChronoUnit';
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import { MathUtil } from '../MathUtil';
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/**
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* Common implementations of {@link TemporalAdjuster}.
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*
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* This class provides common implementations of {@link TemporalAdjuster}.
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* They are especially useful to document the intent of business logic and
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* often link well to requirements.
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* For example, these two pieces of code do the same thing, but the second
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* one is clearer (assuming that there is a static import of this class):
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* <pre>
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* // direct manipulation
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* date.withDayOfMonth(1).plusMonths(1).minusDays(1);
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* // use of an adjuster from this class
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* date.with(lastDayOfMonth());
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* </pre>
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* There are two equivalent ways of using a {@link TemporalAdjuster}.
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* The first is to invoke the method on the interface directly.
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* The second is to use {@link Temporal#with}:
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* <pre>
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* // these two lines are equivalent, but the second approach is recommended
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* dateTime = adjuster.adjustInto(dateTime);
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* dateTime = dateTime.with(adjuster);
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* </pre>
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* It is recommended to use the second approach, {@link with},
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* as it is a lot clearer to read in code.
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*
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* ### Specification for implementors
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*
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* This is a thread-safe utility class.
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* All returned adjusters are immutable and thread-safe.
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*
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* The JDK 8 ofDateAdjuster(UnaryOperator) method is not backported.
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*/
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export class TemporalAdjusters {
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//-----------------------------------------------------------------------
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/**
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* Returns the 'first day of month' adjuster, which returns a new date set to
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* the first day of the current month.
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*
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* The ISO calendar system behaves as follows:
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*
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* * The input 2011-01-15 will return 2011-01-01.
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* * The input 2011-02-15 will return 2011-02-01.
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*
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* The behavior is suitable for use with most calendar systems.
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* It is equivalent to:
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* <pre>
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* temporal.with(DAY_OF_MONTH, 1);
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* </pre>
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*
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* @return {TemporalAdjuster} the first day-of-month adjuster, not null
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*/
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static firstDayOfMonth() {
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return Impl.FIRST_DAY_OF_MONTH;
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}
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/**
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* Returns the 'last day of month' adjuster, which returns a new date set to
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* the last day of the current month.
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*
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* The ISO calendar system behaves as follows:
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*
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* * The input 2011-01-15 will return 2011-01-31.
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* * The input 2011-02-15 will return 2011-02-28.
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* * The input 2012-02-15 will return 2012-02-29 (leap year).
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* * The input 2011-04-15 will return 2011-04-30.
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*
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* The behavior is suitable for use with most calendar systems.
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* It is equivalent to:
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* <pre>
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* long lastDay = temporal.range(DAY_OF_MONTH).getMaximum();
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* temporal.with(DAY_OF_MONTH, lastDay);
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* </pre>
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*
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* @return {TemporalAdjuster} the last day-of-month adjuster, not null
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*/
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static lastDayOfMonth() {
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return Impl.LAST_DAY_OF_MONTH;
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}
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/**
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* Returns the 'first day of next month' adjuster, which returns a new date set to
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* the first day of the next month.
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*
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* The ISO calendar system behaves as follows:
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*
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* * The input 2011-01-15 will return 2011-02-01.
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* * The input 2011-02-15 will return 2011-03-01.
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*
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* The behavior is suitable for use with most calendar systems.
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* It is equivalent to:
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* <pre>
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* temporal.with(DAY_OF_MONTH, 1).plus(1, MONTHS);
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* </pre>
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*
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* @return {TemporalAdjuster} the first day of next month adjuster, not null
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*/
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static firstDayOfNextMonth() {
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return Impl.FIRST_DAY_OF_NEXT_MONTH;
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}
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//-----------------------------------------------------------------------
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/**
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* Returns the 'first day of year' adjuster, which returns a new date set to
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* the first day of the current year.
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*
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* The ISO calendar system behaves as follows:
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*
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* * The input 2011-01-15 will return 2011-01-01.
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* * The input 2011-02-15 will return 2011-01-01.
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*
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* The behavior is suitable for use with most calendar systems.
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* It is equivalent to:
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* <pre>
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* temporal.with(DAY_OF_YEAR, 1);
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* </pre>
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*
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* @return {TemporalAdjuster} the first day-of-year adjuster, not null
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*/
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static firstDayOfYear() {
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return Impl.FIRST_DAY_OF_YEAR;
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}
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/**
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* Returns the 'last day of year' adjuster, which returns a new date set to
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* the last day of the current year.
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*
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* The ISO calendar system behaves as follows:
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*
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* * The input 2011-01-15 will return 2011-12-31.
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* * The input 2011-02-15 will return 2011-12-31.
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*
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* The behavior is suitable for use with most calendar systems.
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* It is equivalent to:
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* <pre>
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* long lastDay = temporal.range(DAY_OF_YEAR).getMaximum();
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* temporal.with(DAY_OF_YEAR, lastDay);
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* </pre>
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*
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* @return {TemporalAdjuster} the last day-of-year adjuster, not null
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*/
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static lastDayOfYear() {
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return Impl.LAST_DAY_OF_YEAR;
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}
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/**
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* Returns the 'first day of next year' adjuster, which returns a new date set to
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* the first day of the next year.
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*
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* The ISO calendar system behaves as follows:
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*
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* * The input 2011-01-15 will return 2012-01-01.
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*
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* The behavior is suitable for use with most calendar systems.
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* It is equivalent to:
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* <pre>
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* temporal.with(DAY_OF_YEAR, 1).plus(1, YEARS);
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* </pre>
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*
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* @return {TemporalAdjuster} the first day of next month adjuster, not null
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*/
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static firstDayOfNextYear() {
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return Impl.FIRST_DAY_OF_NEXT_YEAR;
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}
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//-----------------------------------------------------------------------
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/**
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* Returns the first in month adjuster, which returns a new date
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* in the same month with the first matching day-of-week.
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* This is used for expressions like 'first Tuesday in March'.
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*
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* The ISO calendar system behaves as follows:
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*
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* * The input 2011-12-15 for (MONDAY) will return 2011-12-05.
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* * The input 2011-12-15 for (FRIDAY) will return 2011-12-02.
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*
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* The behavior is suitable for use with most calendar systems.
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* It uses the {@link DAY_OF_WEEK} and {@link DAY_OF_MONTH} fields
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* and the {@link DAYS} unit, and assumes a seven day week.
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*
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* @param {DayOfWeek} dayOfWeek the day-of-week, not null
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* @return {TemporalAdjuster} the first in month adjuster, not null
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*/
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static firstInMonth(dayOfWeek) {
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requireNonNull(dayOfWeek, 'dayOfWeek');
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return new DayOfWeekInMonth(1, dayOfWeek);
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}
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/**
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* Returns the last in month adjuster, which returns a new date
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* in the same month with the last matching day-of-week.
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* This is used for expressions like 'last Tuesday in March'.
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*
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* The ISO calendar system behaves as follows:
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*
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* * The input 2011-12-15 for (MONDAY) will return 2011-12-26.
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* * The input 2011-12-15 for (FRIDAY) will return 2011-12-30.
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*
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* The behavior is suitable for use with most calendar systems.
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* It uses the {@link DAY_OF_WEEK} and {@link DAY_OF_MONTH} fields
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* and the {@link DAYS} unit, and assumes a seven day week.
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*
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* @param {DayOfWeek} dayOfWeek the day-of-week, not null
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* @return {TemporalAdjuster} the first in month adjuster, not null
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*/
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static lastInMonth(dayOfWeek) {
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requireNonNull(dayOfWeek, 'dayOfWeek');
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return new DayOfWeekInMonth(-1, dayOfWeek);
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}
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/**
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* Returns the day-of-week in month adjuster, which returns a new date
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* in the same month with the ordinal day-of-week.
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* This is used for expressions like the 'second Tuesday in March'.
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*
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* The ISO calendar system behaves as follows:
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*
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* * The input 2011-12-15 for (1,TUESDAY) will return 2011-12-06.
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* * The input 2011-12-15 for (2,TUESDAY) will return 2011-12-13.
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* * The input 2011-12-15 for (3,TUESDAY) will return 2011-12-20.
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* * The input 2011-12-15 for (4,TUESDAY) will return 2011-12-27.
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* * The input 2011-12-15 for (5,TUESDAY) will return 2012-01-03.
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* * The input 2011-12-15 for (-1,TUESDAY) will return 2011-12-27 (last in month).
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* * The input 2011-12-15 for (-4,TUESDAY) will return 2011-12-06 (3 weeks before last in month).
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* * The input 2011-12-15 for (-5,TUESDAY) will return 2011-11-29 (4 weeks before last in month).
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* * The input 2011-12-15 for (0,TUESDAY) will return 2011-11-29 (last in previous month).
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*
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* For a positive or zero ordinal, the algorithm is equivalent to finding the first
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* day-of-week that matches within the month and then adding a number of weeks to it.
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* For a negative ordinal, the algorithm is equivalent to finding the last
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* day-of-week that matches within the month and then subtracting a number of weeks to it.
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* The ordinal number of weeks is not validated and is interpreted leniently
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* according to this algorithm. This definition means that an ordinal of zero finds
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* the last matching day-of-week in the previous month.
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*
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* The behavior is suitable for use with most calendar systems.
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* It uses the {@link DAY_OF_WEEK} and {@link DAY_OF_MONTH} fields
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* and the {@link DAYS} unit, and assumes a seven day week.
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*
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* @param {Number} ordinal the week within the month, unbounded but typically from -5 to 5
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* @param {DayOfWeek} dayOfWeek the day-of-week, not null
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* @return {TemporalAdjuster} the day-of-week in month adjuster, not null
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*/
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static dayOfWeekInMonth(ordinal, dayOfWeek) {
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requireNonNull(dayOfWeek, 'dayOfWeek');
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return new DayOfWeekInMonth(ordinal, dayOfWeek);
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}
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//-----------------------------------------------------------------------
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/**
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* Returns the next day-of-week adjuster, which adjusts the date to the
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* first occurrence of the specified day-of-week after the date being adjusted.
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*
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* The ISO calendar system behaves as follows:
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*
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* * The input 2011-01-15 (a Saturday) for parameter (MONDAY) will return 2011-01-17 (two days later).
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* * The input 2011-01-15 (a Saturday) for parameter (WEDNESDAY) will return 2011-01-19 (four days later).
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* * The input 2011-01-15 (a Saturday) for parameter (SATURDAY) will return 2011-01-22 (seven days later).
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*
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* The behavior is suitable for use with most calendar systems.
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* It uses the {@link DAY_OF_WEEK} field and the {@link DAYS} unit,
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* and assumes a seven day week.
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*
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* @param {DayOfWeek} dayOfWeek the day-of-week to move the date to, not null
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* @return {TemporalAdjuster} the next day-of-week adjuster, not null
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*/
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static next(dayOfWeek) {
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return new RelativeDayOfWeek(2, dayOfWeek);
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}
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/**
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* Returns the next-or-same day-of-week adjuster, which adjusts the date to the
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* first occurrence of the specified day-of-week after the date being adjusted
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* unless it is already on that day in which case the same object is returned.
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*
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* The ISO calendar system behaves as follows:
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*
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* * The input 2011-01-15 (a Saturday) for parameter (MONDAY) will return 2011-01-17 (two days later).
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* * The input 2011-01-15 (a Saturday) for parameter (WEDNESDAY) will return 2011-01-19 (four days later).
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* * The input 2011-01-15 (a Saturday) for parameter (SATURDAY) will return 2011-01-15 (same as input).
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*
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* The behavior is suitable for use with most calendar systems.
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* It uses the {@link DAY_OF_WEEK} field and the {@link DAYS} unit,
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* and assumes a seven day week.
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*
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* @param {DayOfWeek} dayOfWeek the day-of-week to check for or move the date to, not null
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* @return {TemporalAdjuster} the next-or-same day-of-week adjuster, not null
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*/
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static nextOrSame(dayOfWeek) {
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return new RelativeDayOfWeek(0, dayOfWeek);
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}
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/**
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* Returns the previous day-of-week adjuster, which adjusts the date to the
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* first occurrence of the specified day-of-week before the date being adjusted.
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*
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* The ISO calendar system behaves as follows:
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*
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* * The input 2011-01-15 (a Saturday) for parameter (MONDAY) will return 2011-01-10 (five days earlier).
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* * The input 2011-01-15 (a Saturday) for parameter (WEDNESDAY) will return 2011-01-12 (three days earlier).
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* * The input 2011-01-15 (a Saturday) for parameter (SATURDAY) will return 2011-01-08 (seven days earlier).
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*
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* The behavior is suitable for use with most calendar systems.
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* It uses the {@link DAY_OF_WEEK} field and the {@link DAYS} unit,
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* and assumes a seven day week.
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*
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* @param {DayOfWeek} dayOfWeek the day-of-week to move the date to, not null
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* @return {TemporalAdjuster} the previous day-of-week adjuster, not null
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*/
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static previous(dayOfWeek) {
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return new RelativeDayOfWeek(3, dayOfWeek);
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}
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/**
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* Returns the previous-or-same day-of-week adjuster, which adjusts the date to the
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* first occurrence of the specified day-of-week before the date being adjusted
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* unless it is already on that day in which case the same object is returned.
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*
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* The ISO calendar system behaves as follows:
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*
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* * The input 2011-01-15 (a Saturday) for parameter (MONDAY) will return 2011-01-10 (five days earlier).
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* * The input 2011-01-15 (a Saturday) for parameter (WEDNESDAY) will return 2011-01-12 (three days earlier).
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* * The input 2011-01-15 (a Saturday) for parameter (SATURDAY) will return 2011-01-15 (same as input).
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*
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* The behavior is suitable for use with most calendar systems.
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* It uses the {@link DAY_OF_WEEK} field and the {@link DAYS} unit,
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* and assumes a seven day week.
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*
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* @param {DayOfWeek} dayOfWeek the day-of-week to check for or move the date to, not null
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* @return {TemporalAdjuster} the previous-or-same day-of-week adjuster, not null
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*/
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static previousOrSame(dayOfWeek) {
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return new RelativeDayOfWeek(1, dayOfWeek);
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}
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}
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//-----------------------------------------------------------------------
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/**
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* Enum implementing the adjusters.
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*/
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class Impl extends TemporalAdjuster {
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/**
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*
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* @param ordinal
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* @private
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*/
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constructor(ordinal) {
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super();
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this._ordinal = ordinal;
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}
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adjustInto(temporal) {
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switch (this._ordinal) {
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case 0: return temporal.with(ChronoField.DAY_OF_MONTH, 1);
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case 1: return temporal.with(ChronoField.DAY_OF_MONTH, temporal.range(ChronoField.DAY_OF_MONTH).maximum());
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case 2: return temporal.with(ChronoField.DAY_OF_MONTH, 1).plus(1, ChronoUnit.MONTHS);
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case 3: return temporal.with(ChronoField.DAY_OF_YEAR, 1);
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case 4: return temporal.with(ChronoField.DAY_OF_YEAR, temporal.range(ChronoField.DAY_OF_YEAR).maximum());
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case 5: return temporal.with(ChronoField.DAY_OF_YEAR, 1).plus(1, ChronoUnit.YEARS);
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}
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throw new IllegalStateException('Unreachable');
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}
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}
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/** First day of month adjuster. */
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Impl.FIRST_DAY_OF_MONTH = new Impl(0);
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/** Last day of month adjuster. */
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Impl.LAST_DAY_OF_MONTH = new Impl(1);
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/** First day of next month adjuster. */
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Impl.FIRST_DAY_OF_NEXT_MONTH = new Impl(2);
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/** First day of year adjuster. */
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Impl.FIRST_DAY_OF_YEAR = new Impl(3);
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/** Last day of year adjuster. */
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Impl.LAST_DAY_OF_YEAR = new Impl(4);
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/** First day of next month adjuster. */
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Impl.FIRST_DAY_OF_NEXT_YEAR = new Impl(5);
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/**
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* Class implementing day-of-week in month adjuster.
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*/
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class DayOfWeekInMonth extends TemporalAdjuster {
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/**
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*
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* @param ordinal
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* @param dow
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* @private
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*/
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constructor(ordinal, dow) {
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super();
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this._ordinal = ordinal;
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this._dowValue = dow.value();
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}
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adjustInto(temporal) {
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if (this._ordinal >= 0) {
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const temp = temporal.with(ChronoField.DAY_OF_MONTH, 1);
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const curDow = temp.get(ChronoField.DAY_OF_WEEK);
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let dowDiff = MathUtil.intMod((this._dowValue - curDow + 7), 7);
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dowDiff += (this._ordinal - 1) * 7; // safe from overflow
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return temp.plus(dowDiff, ChronoUnit.DAYS);
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} else {
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const temp = temporal.with(ChronoField.DAY_OF_MONTH, temporal.range(ChronoField.DAY_OF_MONTH).maximum());
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const curDow = temp.get(ChronoField.DAY_OF_WEEK);
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let daysDiff = this._dowValue - curDow;
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daysDiff = (daysDiff === 0 ? 0 : (daysDiff > 0 ? daysDiff - 7 : daysDiff));
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daysDiff -= (-this._ordinal - 1) * 7; // safe from overflow
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return temp.plus(daysDiff, ChronoUnit.DAYS);
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}
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}
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}
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/**
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* Implementation of next, previous or current day-of-week.
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*/
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class RelativeDayOfWeek extends TemporalAdjuster {
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/**
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*
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* @param relative
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* @param dayOfWeek
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* @private
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*/
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constructor(relative, dayOfWeek) {
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super();
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requireNonNull(dayOfWeek, 'dayOfWeek');
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/** Whether the current date is a valid answer. */
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this._relative = relative;
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/** The day-of-week value, from 1 to 7. */
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this._dowValue = dayOfWeek.value();
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}
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adjustInto(temporal) {
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const calDow = temporal.get(ChronoField.DAY_OF_WEEK);
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if (this._relative < 2 && calDow === this._dowValue) {
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return temporal;
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}
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if ((this._relative & 1) === 0) {
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const daysDiff = calDow - this._dowValue;
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return temporal.plus(daysDiff >= 0 ? 7 - daysDiff : -daysDiff, ChronoUnit.DAYS);
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} else {
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const daysDiff = this._dowValue - calDow;
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return temporal.minus(daysDiff >= 0 ? 7 - daysDiff : -daysDiff, ChronoUnit.DAYS);
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}
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}
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}
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