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479 lines
20 KiB
479 lines
20 KiB
/*
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* Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved.
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* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*/
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/*
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*
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*
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*
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*
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*
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* Copyright (c) 2012-2013, Stephen Colebourne & Michael Nascimento Santos
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*
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* * Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* * Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* * Neither the name of JSR-310 nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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package java.time.temporal;
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import static java.time.temporal.ChronoField.DAY_OF_MONTH;
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import static java.time.temporal.ChronoField.DAY_OF_WEEK;
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import static java.time.temporal.ChronoField.DAY_OF_YEAR;
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import static java.time.temporal.ChronoUnit.DAYS;
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import static java.time.temporal.ChronoUnit.MONTHS;
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import static java.time.temporal.ChronoUnit.YEARS;
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import java.time.DayOfWeek;
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import java.time.LocalDate;
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import java.util.Objects;
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import java.util.function.UnaryOperator;
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/**
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* Common and useful TemporalAdjusters.
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* <p>
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* Adjusters are a key tool for modifying temporal objects.
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* They exist to externalize the process of adjustment, permitting different
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* approaches, as per the strategy design pattern.
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* Examples might be an adjuster that sets the date avoiding weekends, or one that
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* sets the date to the last day of the month.
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* <p>
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* There are two equivalent ways of using a {@code 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(TemporalAdjuster)}:
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* <pre>
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* // these two lines are equivalent, but the second approach is recommended
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* temporal = thisAdjuster.adjustInto(temporal);
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* temporal = temporal.with(thisAdjuster);
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* </pre>
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* It is recommended to use the second approach, {@code with(TemporalAdjuster)},
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* as it is a lot clearer to read in code.
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* <p>
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* This class contains a standard set of adjusters, available as static methods.
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* These include:
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* <ul>
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* <li>finding the first or last day of the month
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* <li>finding the first day of next month
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* <li>finding the first or last day of the year
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* <li>finding the first day of next year
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* <li>finding the first or last day-of-week within a month, such as "first Wednesday in June"
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* <li>finding the next or previous day-of-week, such as "next Thursday"
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* </ul>
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*
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* @implSpec
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* All the implementations supplied by the static methods are immutable.
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*
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* @see TemporalAdjuster
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* @since 1.8
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*/
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public final class TemporalAdjusters {
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/**
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* Private constructor since this is a utility class.
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*/
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private TemporalAdjusters() {
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}
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//-----------------------------------------------------------------------
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/**
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* Obtains a {@code TemporalAdjuster} that wraps a date adjuster.
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* <p>
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* The {@code TemporalAdjuster} is based on the low level {@code Temporal} interface.
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* This method allows an adjustment from {@code LocalDate} to {@code LocalDate}
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* to be wrapped to match the temporal-based interface.
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* This is provided for convenience to make user-written adjusters simpler.
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* <p>
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* In general, user-written adjusters should be static constants:
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* <pre>{@code
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* static TemporalAdjuster TWO_DAYS_LATER =
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* TemporalAdjusters.ofDateAdjuster(date -> date.plusDays(2));
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* }</pre>
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*
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* @param dateBasedAdjuster the date-based adjuster, not null
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* @return the temporal adjuster wrapping on the date adjuster, not null
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*/
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public static TemporalAdjuster ofDateAdjuster(UnaryOperator<LocalDate> dateBasedAdjuster) {
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Objects.requireNonNull(dateBasedAdjuster, "dateBasedAdjuster");
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return (temporal) -> {
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LocalDate input = LocalDate.from(temporal);
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LocalDate output = dateBasedAdjuster.apply(input);
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return temporal.with(output);
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};
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}
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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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* <p>
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* The ISO calendar system behaves as follows:<br>
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* The input 2011-01-15 will return 2011-01-01.<br>
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* The input 2011-02-15 will return 2011-02-01.
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* <p>
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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 the first day-of-month adjuster, not null
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*/
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public static TemporalAdjuster firstDayOfMonth() {
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return (temporal) -> temporal.with(DAY_OF_MONTH, 1);
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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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* <p>
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* The ISO calendar system behaves as follows:<br>
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* The input 2011-01-15 will return 2011-01-31.<br>
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* The input 2011-02-15 will return 2011-02-28.<br>
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* The input 2012-02-15 will return 2012-02-29 (leap year).<br>
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* The input 2011-04-15 will return 2011-04-30.
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* <p>
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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 the last day-of-month adjuster, not null
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*/
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public static TemporalAdjuster lastDayOfMonth() {
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return (temporal) -> temporal.with(DAY_OF_MONTH, temporal.range(DAY_OF_MONTH).getMaximum());
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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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* <p>
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* The ISO calendar system behaves as follows:<br>
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* The input 2011-01-15 will return 2011-02-01.<br>
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* The input 2011-02-15 will return 2011-03-01.
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* <p>
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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 the first day of next month adjuster, not null
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*/
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public static TemporalAdjuster firstDayOfNextMonth() {
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return (temporal) -> temporal.with(DAY_OF_MONTH, 1).plus(1, MONTHS);
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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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* <p>
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* The ISO calendar system behaves as follows:<br>
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* The input 2011-01-15 will return 2011-01-01.<br>
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* The input 2011-02-15 will return 2011-01-01.<br>
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* <p>
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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 the first day-of-year adjuster, not null
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*/
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public static TemporalAdjuster firstDayOfYear() {
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return (temporal) -> temporal.with(DAY_OF_YEAR, 1);
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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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* <p>
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* The ISO calendar system behaves as follows:<br>
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* The input 2011-01-15 will return 2011-12-31.<br>
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* The input 2011-02-15 will return 2011-12-31.<br>
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* <p>
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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 the last day-of-year adjuster, not null
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*/
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public static TemporalAdjuster lastDayOfYear() {
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return (temporal) -> temporal.with(DAY_OF_YEAR, temporal.range(DAY_OF_YEAR).getMaximum());
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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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* <p>
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* The ISO calendar system behaves as follows:<br>
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* The input 2011-01-15 will return 2012-01-01.
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* <p>
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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 the first day of next month adjuster, not null
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*/
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public static TemporalAdjuster firstDayOfNextYear() {
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return (temporal) -> temporal.with(DAY_OF_YEAR, 1).plus(1, YEARS);
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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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* <p>
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* The ISO calendar system behaves as follows:<br>
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* The input 2011-12-15 for (MONDAY) will return 2011-12-05.<br>
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* The input 2011-12-15 for (FRIDAY) will return 2011-12-02.<br>
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* <p>
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* The behavior is suitable for use with most calendar systems.
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* It uses the {@code DAY_OF_WEEK} and {@code DAY_OF_MONTH} fields
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* and the {@code DAYS} unit, and assumes a seven day week.
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*
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* @param dayOfWeek the day-of-week, not null
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* @return the first in month adjuster, not null
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*/
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public static TemporalAdjuster firstInMonth(DayOfWeek dayOfWeek) {
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return TemporalAdjusters.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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* <p>
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* The ISO calendar system behaves as follows:<br>
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* The input 2011-12-15 for (MONDAY) will return 2011-12-26.<br>
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* The input 2011-12-15 for (FRIDAY) will return 2011-12-30.<br>
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* <p>
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* The behavior is suitable for use with most calendar systems.
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* It uses the {@code DAY_OF_WEEK} and {@code DAY_OF_MONTH} fields
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* and the {@code DAYS} unit, and assumes a seven day week.
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*
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* @param dayOfWeek the day-of-week, not null
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* @return the first in month adjuster, not null
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*/
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public static TemporalAdjuster lastInMonth(DayOfWeek dayOfWeek) {
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return TemporalAdjusters.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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* <p>
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* The ISO calendar system behaves as follows:<br>
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* The input 2011-12-15 for (1,TUESDAY) will return 2011-12-06.<br>
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* The input 2011-12-15 for (2,TUESDAY) will return 2011-12-13.<br>
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* The input 2011-12-15 for (3,TUESDAY) will return 2011-12-20.<br>
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* The input 2011-12-15 for (4,TUESDAY) will return 2011-12-27.<br>
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* The input 2011-12-15 for (5,TUESDAY) will return 2012-01-03.<br>
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* The input 2011-12-15 for (-1,TUESDAY) will return 2011-12-27 (last in month).<br>
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* The input 2011-12-15 for (-4,TUESDAY) will return 2011-12-06 (3 weeks before last in month).<br>
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* The input 2011-12-15 for (-5,TUESDAY) will return 2011-11-29 (4 weeks before last in month).<br>
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* The input 2011-12-15 for (0,TUESDAY) will return 2011-11-29 (last in previous month).<br>
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* <p>
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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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* <p>
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* The behavior is suitable for use with most calendar systems.
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* It uses the {@code DAY_OF_WEEK} and {@code DAY_OF_MONTH} fields
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* and the {@code DAYS} unit, and assumes a seven day week.
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*
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* @param ordinal the week within the month, unbounded but typically from -5 to 5
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* @param dayOfWeek the day-of-week, not null
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* @return the day-of-week in month adjuster, not null
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*/
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public static TemporalAdjuster dayOfWeekInMonth(int ordinal, DayOfWeek dayOfWeek) {
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Objects.requireNonNull(dayOfWeek, "dayOfWeek");
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int dowValue = dayOfWeek.getValue();
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if (ordinal >= 0) {
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return (temporal) -> {
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Temporal temp = temporal.with(DAY_OF_MONTH, 1);
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int curDow = temp.get(DAY_OF_WEEK);
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int dowDiff = (dowValue - curDow + 7) % 7;
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dowDiff += (ordinal - 1L) * 7L; // safe from overflow
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return temp.plus(dowDiff, DAYS);
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};
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} else {
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return (temporal) -> {
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Temporal temp = temporal.with(DAY_OF_MONTH, temporal.range(DAY_OF_MONTH).getMaximum());
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int curDow = temp.get(DAY_OF_WEEK);
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int daysDiff = dowValue - curDow;
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daysDiff = (daysDiff == 0 ? 0 : (daysDiff > 0 ? daysDiff - 7 : daysDiff));
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daysDiff -= (-ordinal - 1L) * 7L; // safe from overflow
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return temp.plus(daysDiff, DAYS);
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};
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}
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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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* <p>
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* The ISO calendar system behaves as follows:<br>
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* The input 2011-01-15 (a Saturday) for parameter (MONDAY) will return 2011-01-17 (two days later).<br>
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* The input 2011-01-15 (a Saturday) for parameter (WEDNESDAY) will return 2011-01-19 (four days later).<br>
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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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* <p>
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* The behavior is suitable for use with most calendar systems.
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* It uses the {@code DAY_OF_WEEK} field and the {@code DAYS} unit,
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* and assumes a seven day week.
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*
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* @param dayOfWeek the day-of-week to move the date to, not null
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* @return the next day-of-week adjuster, not null
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*/
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public static TemporalAdjuster next(DayOfWeek dayOfWeek) {
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int dowValue = dayOfWeek.getValue();
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return (temporal) -> {
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int calDow = temporal.get(DAY_OF_WEEK);
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int daysDiff = calDow - dowValue;
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return temporal.plus(daysDiff >= 0 ? 7 - daysDiff : -daysDiff, DAYS);
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};
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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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* <p>
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* The ISO calendar system behaves as follows:<br>
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* The input 2011-01-15 (a Saturday) for parameter (MONDAY) will return 2011-01-17 (two days later).<br>
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* The input 2011-01-15 (a Saturday) for parameter (WEDNESDAY) will return 2011-01-19 (four days later).<br>
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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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* <p>
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* The behavior is suitable for use with most calendar systems.
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* It uses the {@code DAY_OF_WEEK} field and the {@code DAYS} unit,
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* and assumes a seven day week.
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*
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* @param dayOfWeek the day-of-week to check for or move the date to, not null
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* @return the next-or-same day-of-week adjuster, not null
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*/
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public static TemporalAdjuster nextOrSame(DayOfWeek dayOfWeek) {
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int dowValue = dayOfWeek.getValue();
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return (temporal) -> {
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int calDow = temporal.get(DAY_OF_WEEK);
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if (calDow == dowValue) {
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return temporal;
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}
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int daysDiff = calDow - dowValue;
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return temporal.plus(daysDiff >= 0 ? 7 - daysDiff : -daysDiff, DAYS);
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};
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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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* <p>
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* The ISO calendar system behaves as follows:<br>
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* The input 2011-01-15 (a Saturday) for parameter (MONDAY) will return 2011-01-10 (five days earlier).<br>
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* The input 2011-01-15 (a Saturday) for parameter (WEDNESDAY) will return 2011-01-12 (three days earlier).<br>
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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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* <p>
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* The behavior is suitable for use with most calendar systems.
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* It uses the {@code DAY_OF_WEEK} field and the {@code DAYS} unit,
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* and assumes a seven day week.
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*
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* @param dayOfWeek the day-of-week to move the date to, not null
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* @return the previous day-of-week adjuster, not null
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*/
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public static TemporalAdjuster previous(DayOfWeek dayOfWeek) {
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int dowValue = dayOfWeek.getValue();
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return (temporal) -> {
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int calDow = temporal.get(DAY_OF_WEEK);
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int daysDiff = dowValue - calDow;
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return temporal.minus(daysDiff >= 0 ? 7 - daysDiff : -daysDiff, DAYS);
|
|
};
|
|
}
|
|
|
|
/**
|
|
* Returns the previous-or-same day-of-week adjuster, which adjusts the date to the
|
|
* first occurrence of the specified day-of-week before the date being adjusted
|
|
* unless it is already on that day in which case the same object is returned.
|
|
* <p>
|
|
* The ISO calendar system behaves as follows:<br>
|
|
* The input 2011-01-15 (a Saturday) for parameter (MONDAY) will return 2011-01-10 (five days earlier).<br>
|
|
* The input 2011-01-15 (a Saturday) for parameter (WEDNESDAY) will return 2011-01-12 (three days earlier).<br>
|
|
* The input 2011-01-15 (a Saturday) for parameter (SATURDAY) will return 2011-01-15 (same as input).
|
|
* <p>
|
|
* The behavior is suitable for use with most calendar systems.
|
|
* It uses the {@code DAY_OF_WEEK} field and the {@code DAYS} unit,
|
|
* and assumes a seven day week.
|
|
*
|
|
* @param dayOfWeek the day-of-week to check for or move the date to, not null
|
|
* @return the previous-or-same day-of-week adjuster, not null
|
|
*/
|
|
public static TemporalAdjuster previousOrSame(DayOfWeek dayOfWeek) {
|
|
int dowValue = dayOfWeek.getValue();
|
|
return (temporal) -> {
|
|
int calDow = temporal.get(DAY_OF_WEEK);
|
|
if (calDow == dowValue) {
|
|
return temporal;
|
|
}
|
|
int daysDiff = dowValue - calDow;
|
|
return temporal.minus(daysDiff >= 0 ? 7 - daysDiff : -daysDiff, DAYS);
|
|
};
|
|
}
|
|
|
|
}
|