1c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer/* 2c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved. 3c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * 5c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * This code is free software; you can redistribute it and/or modify it 6c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * under the terms of the GNU General Public License version 2 only, as 7c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * published by the Free Software Foundation. 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See the GNU General Public License 14c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * version 2 for more details (a copy is included in the LICENSE file that 15c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * accompanied this code). 16c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * 17c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * You should have received a copy of the GNU General Public License version 18c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * 2 along with this work; if not, write to the Free Software Foundation, 19c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * 21c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * or visit www.oracle.com if you need additional information or have any 23c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * questions. 24c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer */ 25c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer 26c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer/* 27c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * This file is available under and governed by the GNU General Public 28c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * License version 2 only, as published by the Free Software Foundation. 29c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * However, the following notice accompanied the original version of this 30c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * file: 31c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * 32c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * Copyright (c) 2012-2013, Stephen Colebourne & Michael Nascimento Santos 33c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * 34c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * All rights reserved. 35c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * 36c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * Redistribution and use in source and binary forms, with or without 37c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * modification, are permitted provided that the following conditions are met: 38c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * 39c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * * Redistributions of source code must retain the above copyright notice, 40c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * this list of conditions and the following disclaimer. 41c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * 42c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * * Redistributions in binary form must reproduce the above copyright notice, 43c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * this list of conditions and the following disclaimer in the documentation 44c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * and/or other materials provided with the distribution. 45c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * 46c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * * Neither the name of JSR-310 nor the names of its contributors 47c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * may be used to endorse or promote products derived from this software 48c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * without specific prior written permission. 49c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * 50c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 51c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 52c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 53c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR 54c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 55c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 56c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 57c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 58c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 59c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 60c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 61c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer */ 62c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauerpackage java.time.temporal; 63c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer 64c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauerimport static java.time.temporal.ChronoField.DAY_OF_MONTH; 65c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauerimport static java.time.temporal.ChronoField.DAY_OF_WEEK; 66c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauerimport static java.time.temporal.ChronoField.DAY_OF_YEAR; 67c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauerimport static java.time.temporal.ChronoUnit.DAYS; 68c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauerimport static java.time.temporal.ChronoUnit.MONTHS; 69c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauerimport static java.time.temporal.ChronoUnit.YEARS; 70c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer 71c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauerimport java.time.DayOfWeek; 72c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauerimport java.time.LocalDate; 73c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauerimport java.util.Objects; 74c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauerimport java.util.function.UnaryOperator; 75c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer 76c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer/** 77c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * Common and useful TemporalAdjusters. 78c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * <p> 79c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * Adjusters are a key tool for modifying temporal objects. 80c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * They exist to externalize the process of adjustment, permitting different 81c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * approaches, as per the strategy design pattern. 82c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * Examples might be an adjuster that sets the date avoiding weekends, or one that 83c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * sets the date to the last day of the month. 84c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * <p> 85c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * There are two equivalent ways of using a {@code TemporalAdjuster}. 86c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * The first is to invoke the method on the interface directly. 87c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * The second is to use {@link Temporal#with(TemporalAdjuster)}: 88c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * <pre> 89c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * // these two lines are equivalent, but the second approach is recommended 90c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * temporal = thisAdjuster.adjustInto(temporal); 91c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * temporal = temporal.with(thisAdjuster); 92c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * </pre> 93c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * It is recommended to use the second approach, {@code with(TemporalAdjuster)}, 94c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * as it is a lot clearer to read in code. 95c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * <p> 96c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * This class contains a standard set of adjusters, available as static methods. 97c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * These include: 98c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * <ul> 99c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * <li>finding the first or last day of the month 100c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * <li>finding the first day of next month 101c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * <li>finding the first or last day of the year 102c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * <li>finding the first day of next year 103c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * <li>finding the first or last day-of-week within a month, such as "first Wednesday in June" 104c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * <li>finding the next or previous day-of-week, such as "next Thursday" 105c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * </ul> 106c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * 107c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * @implSpec 108c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * All the implementations supplied by the static methods are immutable. 109c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * 110c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * @see TemporalAdjuster 111c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * @since 1.8 112c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer */ 113c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauerpublic final class TemporalAdjusters { 114c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer 115c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer /** 116c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * Private constructor since this is a utility class. 117c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer */ 118c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer private TemporalAdjusters() { 119c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer } 120c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer 121c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer //----------------------------------------------------------------------- 122c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer /** 123c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * Obtains a {@code TemporalAdjuster} that wraps a date adjuster. 124c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * <p> 125c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * The {@code TemporalAdjuster} is based on the low level {@code Temporal} interface. 126c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * This method allows an adjustment from {@code LocalDate} to {@code LocalDate} 127c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * to be wrapped to match the temporal-based interface. 128c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * This is provided for convenience to make user-written adjusters simpler. 129c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * <p> 130c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * In general, user-written adjusters should be static constants: 131c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * <pre>{@code 132c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * static TemporalAdjuster TWO_DAYS_LATER = 133c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * TemporalAdjusters.ofDateAdjuster(date -> date.plusDays(2)); 134c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * }</pre> 135c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * 136c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * @param dateBasedAdjuster the date-based adjuster, not null 137c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * @return the temporal adjuster wrapping on the date adjuster, not null 138c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer */ 139c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer public static TemporalAdjuster ofDateAdjuster(UnaryOperator<LocalDate> dateBasedAdjuster) { 140c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer Objects.requireNonNull(dateBasedAdjuster, "dateBasedAdjuster"); 141c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer return (temporal) -> { 142c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer LocalDate input = LocalDate.from(temporal); 143c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer LocalDate output = dateBasedAdjuster.apply(input); 144c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer return temporal.with(output); 145c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer }; 146c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer } 147c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer 148c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer //----------------------------------------------------------------------- 149c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer /** 150c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * Returns the "first day of month" adjuster, which returns a new date set to 151c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * the first day of the current month. 152c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * <p> 153c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * The ISO calendar system behaves as follows:<br> 154c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * The input 2011-01-15 will return 2011-01-01.<br> 155c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * The input 2011-02-15 will return 2011-02-01. 156c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * <p> 157c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * The behavior is suitable for use with most calendar systems. 158c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * It is equivalent to: 159c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * <pre> 160c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * temporal.with(DAY_OF_MONTH, 1); 161c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * </pre> 162c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * 163c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * @return the first day-of-month adjuster, not null 164c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer */ 165c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer public static TemporalAdjuster firstDayOfMonth() { 166c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer return (temporal) -> temporal.with(DAY_OF_MONTH, 1); 167c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer } 168c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer 169c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer /** 170c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * Returns the "last day of month" adjuster, which returns a new date set to 171c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * the last day of the current month. 172c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * <p> 173c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * The ISO calendar system behaves as follows:<br> 174c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * The input 2011-01-15 will return 2011-01-31.<br> 175c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * The input 2011-02-15 will return 2011-02-28.<br> 176c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * The input 2012-02-15 will return 2012-02-29 (leap year).<br> 177c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * The input 2011-04-15 will return 2011-04-30. 178c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * <p> 179c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * The behavior is suitable for use with most calendar systems. 180c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * It is equivalent to: 181c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * <pre> 182c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * long lastDay = temporal.range(DAY_OF_MONTH).getMaximum(); 183c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * temporal.with(DAY_OF_MONTH, lastDay); 184c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * </pre> 185c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * 186c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * @return the last day-of-month adjuster, not null 187c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer */ 188c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer public static TemporalAdjuster lastDayOfMonth() { 189c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer return (temporal) -> temporal.with(DAY_OF_MONTH, temporal.range(DAY_OF_MONTH).getMaximum()); 190c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer } 191c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer 192c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer /** 193c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * Returns the "first day of next month" adjuster, which returns a new date set to 194c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * the first day of the next month. 195c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * <p> 196c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * The ISO calendar system behaves as follows:<br> 197c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * The input 2011-01-15 will return 2011-02-01.<br> 198c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * The input 2011-02-15 will return 2011-03-01. 199c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * <p> 200c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * The behavior is suitable for use with most calendar systems. 201c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * It is equivalent to: 202c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * <pre> 203c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * temporal.with(DAY_OF_MONTH, 1).plus(1, MONTHS); 204c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * </pre> 205c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * 206c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * @return the first day of next month adjuster, not null 207c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer */ 208c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer public static TemporalAdjuster firstDayOfNextMonth() { 209c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer return (temporal) -> temporal.with(DAY_OF_MONTH, 1).plus(1, MONTHS); 210c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer } 211c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer 212c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer //----------------------------------------------------------------------- 213c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer /** 214c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * Returns the "first day of year" adjuster, which returns a new date set to 215c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * the first day of the current year. 216c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * <p> 217c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * The ISO calendar system behaves as follows:<br> 218c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * The input 2011-01-15 will return 2011-01-01.<br> 219c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * The input 2011-02-15 will return 2011-01-01.<br> 220c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * <p> 221c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * The behavior is suitable for use with most calendar systems. 222c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * It is equivalent to: 223c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * <pre> 224c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * temporal.with(DAY_OF_YEAR, 1); 225c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * </pre> 226c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * 227c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * @return the first day-of-year adjuster, not null 228c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer */ 229c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer public static TemporalAdjuster firstDayOfYear() { 230c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer return (temporal) -> temporal.with(DAY_OF_YEAR, 1); 231c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer } 232c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer 233c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer /** 234c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * Returns the "last day of year" adjuster, which returns a new date set to 235c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * the last day of the current year. 236c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * <p> 237c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * The ISO calendar system behaves as follows:<br> 238c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * The input 2011-01-15 will return 2011-12-31.<br> 239c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * The input 2011-02-15 will return 2011-12-31.<br> 240c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * <p> 241c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * The behavior is suitable for use with most calendar systems. 242c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * It is equivalent to: 243c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * <pre> 244c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * long lastDay = temporal.range(DAY_OF_YEAR).getMaximum(); 245c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * temporal.with(DAY_OF_YEAR, lastDay); 246c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * </pre> 247c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * 248c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * @return the last day-of-year adjuster, not null 249c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer */ 250c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer public static TemporalAdjuster lastDayOfYear() { 251c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer return (temporal) -> temporal.with(DAY_OF_YEAR, temporal.range(DAY_OF_YEAR).getMaximum()); 252c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer } 253c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer 254c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer /** 255c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * Returns the "first day of next year" adjuster, which returns a new date set to 256c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * the first day of the next year. 257c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * <p> 258c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * The ISO calendar system behaves as follows:<br> 259c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * The input 2011-01-15 will return 2012-01-01. 260c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * <p> 261c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * The behavior is suitable for use with most calendar systems. 262c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * It is equivalent to: 263c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * <pre> 264c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * temporal.with(DAY_OF_YEAR, 1).plus(1, YEARS); 265c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * </pre> 266c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * 267c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * @return the first day of next month adjuster, not null 268c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer */ 269c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer public static TemporalAdjuster firstDayOfNextYear() { 270c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer return (temporal) -> temporal.with(DAY_OF_YEAR, 1).plus(1, YEARS); 271c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer } 272c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer 273c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer //----------------------------------------------------------------------- 274c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer /** 275c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * Returns the first in month adjuster, which returns a new date 276c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * in the same month with the first matching day-of-week. 277c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * This is used for expressions like 'first Tuesday in March'. 278c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * <p> 279c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * The ISO calendar system behaves as follows:<br> 280c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * The input 2011-12-15 for (MONDAY) will return 2011-12-05.<br> 281c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * The input 2011-12-15 for (FRIDAY) will return 2011-12-02.<br> 282c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * <p> 283c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * The behavior is suitable for use with most calendar systems. 284c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * It uses the {@code DAY_OF_WEEK} and {@code DAY_OF_MONTH} fields 285c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * and the {@code DAYS} unit, and assumes a seven day week. 286c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * 287c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * @param dayOfWeek the day-of-week, not null 288c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * @return the first in month adjuster, not null 289c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer */ 290c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer public static TemporalAdjuster firstInMonth(DayOfWeek dayOfWeek) { 291c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer return TemporalAdjusters.dayOfWeekInMonth(1, dayOfWeek); 292c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer } 293c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer 294c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer /** 295c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * Returns the last in month adjuster, which returns a new date 296c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * in the same month with the last matching day-of-week. 297c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * This is used for expressions like 'last Tuesday in March'. 298c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * <p> 299c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * The ISO calendar system behaves as follows:<br> 300c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * The input 2011-12-15 for (MONDAY) will return 2011-12-26.<br> 301c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * The input 2011-12-15 for (FRIDAY) will return 2011-12-30.<br> 302c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * <p> 303c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * The behavior is suitable for use with most calendar systems. 304c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * It uses the {@code DAY_OF_WEEK} and {@code DAY_OF_MONTH} fields 305c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * and the {@code DAYS} unit, and assumes a seven day week. 306c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * 307c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * @param dayOfWeek the day-of-week, not null 308c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * @return the first in month adjuster, not null 309c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer */ 310c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer public static TemporalAdjuster lastInMonth(DayOfWeek dayOfWeek) { 311c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer return TemporalAdjusters.dayOfWeekInMonth(-1, dayOfWeek); 312c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer } 313c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer 314c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer /** 315c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * Returns the day-of-week in month adjuster, which returns a new date 316c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * in the same month with the ordinal day-of-week. 317c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * This is used for expressions like the 'second Tuesday in March'. 318c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * <p> 319c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * The ISO calendar system behaves as follows:<br> 320c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * The input 2011-12-15 for (1,TUESDAY) will return 2011-12-06.<br> 321c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * The input 2011-12-15 for (2,TUESDAY) will return 2011-12-13.<br> 322c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * The input 2011-12-15 for (3,TUESDAY) will return 2011-12-20.<br> 323c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * The input 2011-12-15 for (4,TUESDAY) will return 2011-12-27.<br> 324c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * The input 2011-12-15 for (5,TUESDAY) will return 2012-01-03.<br> 325c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * The input 2011-12-15 for (-1,TUESDAY) will return 2011-12-27 (last in month).<br> 326c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * The input 2011-12-15 for (-4,TUESDAY) will return 2011-12-06 (3 weeks before last in month).<br> 327c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * The input 2011-12-15 for (-5,TUESDAY) will return 2011-11-29 (4 weeks before last in month).<br> 328c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * The input 2011-12-15 for (0,TUESDAY) will return 2011-11-29 (last in previous month).<br> 329c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * <p> 330c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * For a positive or zero ordinal, the algorithm is equivalent to finding the first 331c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * day-of-week that matches within the month and then adding a number of weeks to it. 332c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * For a negative ordinal, the algorithm is equivalent to finding the last 333c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * day-of-week that matches within the month and then subtracting a number of weeks to it. 334c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * The ordinal number of weeks is not validated and is interpreted leniently 335c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * according to this algorithm. This definition means that an ordinal of zero finds 336c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * the last matching day-of-week in the previous month. 337c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * <p> 338c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * The behavior is suitable for use with most calendar systems. 339c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * It uses the {@code DAY_OF_WEEK} and {@code DAY_OF_MONTH} fields 340c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * and the {@code DAYS} unit, and assumes a seven day week. 341c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * 342c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * @param ordinal the week within the month, unbounded but typically from -5 to 5 343c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * @param dayOfWeek the day-of-week, not null 344c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * @return the day-of-week in month adjuster, not null 345c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer */ 346c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer public static TemporalAdjuster dayOfWeekInMonth(int ordinal, DayOfWeek dayOfWeek) { 347c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer Objects.requireNonNull(dayOfWeek, "dayOfWeek"); 348c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer int dowValue = dayOfWeek.getValue(); 349c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer if (ordinal >= 0) { 350c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer return (temporal) -> { 351c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer Temporal temp = temporal.with(DAY_OF_MONTH, 1); 352c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer int curDow = temp.get(DAY_OF_WEEK); 353c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer int dowDiff = (dowValue - curDow + 7) % 7; 354c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer dowDiff += (ordinal - 1L) * 7L; // safe from overflow 355c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer return temp.plus(dowDiff, DAYS); 356c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer }; 357c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer } else { 358c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer return (temporal) -> { 359c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer Temporal temp = temporal.with(DAY_OF_MONTH, temporal.range(DAY_OF_MONTH).getMaximum()); 360c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer int curDow = temp.get(DAY_OF_WEEK); 361c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer int daysDiff = dowValue - curDow; 362c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer daysDiff = (daysDiff == 0 ? 0 : (daysDiff > 0 ? daysDiff - 7 : daysDiff)); 363c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer daysDiff -= (-ordinal - 1L) * 7L; // safe from overflow 364c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer return temp.plus(daysDiff, DAYS); 365c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer }; 366c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer } 367c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer } 368c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer 369c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer //----------------------------------------------------------------------- 370c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer /** 371c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * Returns the next day-of-week adjuster, which adjusts the date to the 372c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * first occurrence of the specified day-of-week after the date being adjusted. 373c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * <p> 374c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * The ISO calendar system behaves as follows:<br> 375c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * The input 2011-01-15 (a Saturday) for parameter (MONDAY) will return 2011-01-17 (two days later).<br> 376c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * The input 2011-01-15 (a Saturday) for parameter (WEDNESDAY) will return 2011-01-19 (four days later).<br> 377c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * The input 2011-01-15 (a Saturday) for parameter (SATURDAY) will return 2011-01-22 (seven days later). 378c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * <p> 379c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * The behavior is suitable for use with most calendar systems. 380c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * It uses the {@code DAY_OF_WEEK} field and the {@code DAYS} unit, 381c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * and assumes a seven day week. 382c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * 383c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * @param dayOfWeek the day-of-week to move the date to, not null 384c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * @return the next day-of-week adjuster, not null 385c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer */ 386c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer public static TemporalAdjuster next(DayOfWeek dayOfWeek) { 387c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer int dowValue = dayOfWeek.getValue(); 388c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer return (temporal) -> { 389c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer int calDow = temporal.get(DAY_OF_WEEK); 390c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer int daysDiff = calDow - dowValue; 391c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer return temporal.plus(daysDiff >= 0 ? 7 - daysDiff : -daysDiff, DAYS); 392c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer }; 393c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer } 394c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer 395c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer /** 396c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * Returns the next-or-same day-of-week adjuster, which adjusts the date to the 397c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * first occurrence of the specified day-of-week after the date being adjusted 398c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * unless it is already on that day in which case the same object is returned. 399c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * <p> 400c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * The ISO calendar system behaves as follows:<br> 401c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * The input 2011-01-15 (a Saturday) for parameter (MONDAY) will return 2011-01-17 (two days later).<br> 402c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * The input 2011-01-15 (a Saturday) for parameter (WEDNESDAY) will return 2011-01-19 (four days later).<br> 403c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * The input 2011-01-15 (a Saturday) for parameter (SATURDAY) will return 2011-01-15 (same as input). 404c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * <p> 405c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * The behavior is suitable for use with most calendar systems. 406c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * It uses the {@code DAY_OF_WEEK} field and the {@code DAYS} unit, 407c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * and assumes a seven day week. 408c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * 409c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * @param dayOfWeek the day-of-week to check for or move the date to, not null 410c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * @return the next-or-same day-of-week adjuster, not null 411c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer */ 412c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer public static TemporalAdjuster nextOrSame(DayOfWeek dayOfWeek) { 413c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer int dowValue = dayOfWeek.getValue(); 414c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer return (temporal) -> { 415c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer int calDow = temporal.get(DAY_OF_WEEK); 416c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer if (calDow == dowValue) { 417c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer return temporal; 418c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer } 419c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer int daysDiff = calDow - dowValue; 420c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer return temporal.plus(daysDiff >= 0 ? 7 - daysDiff : -daysDiff, DAYS); 421c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer }; 422c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer } 423c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer 424c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer /** 425c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * Returns the previous day-of-week adjuster, which adjusts the date to the 426c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * first occurrence of the specified day-of-week before the date being adjusted. 427c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * <p> 428c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * The ISO calendar system behaves as follows:<br> 429c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * The input 2011-01-15 (a Saturday) for parameter (MONDAY) will return 2011-01-10 (five days earlier).<br> 430c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * The input 2011-01-15 (a Saturday) for parameter (WEDNESDAY) will return 2011-01-12 (three days earlier).<br> 431c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * The input 2011-01-15 (a Saturday) for parameter (SATURDAY) will return 2011-01-08 (seven days earlier). 432c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * <p> 433c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * The behavior is suitable for use with most calendar systems. 434c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * It uses the {@code DAY_OF_WEEK} field and the {@code DAYS} unit, 435c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * and assumes a seven day week. 436c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * 437c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * @param dayOfWeek the day-of-week to move the date to, not null 438c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * @return the previous day-of-week adjuster, not null 439c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer */ 440c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer public static TemporalAdjuster previous(DayOfWeek dayOfWeek) { 441c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer int dowValue = dayOfWeek.getValue(); 442c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer return (temporal) -> { 443c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer int calDow = temporal.get(DAY_OF_WEEK); 444c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer int daysDiff = dowValue - calDow; 445c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer return temporal.minus(daysDiff >= 0 ? 7 - daysDiff : -daysDiff, DAYS); 446c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer }; 447c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer } 448c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer 449c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer /** 450c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * Returns the previous-or-same day-of-week adjuster, which adjusts the date to the 451c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * first occurrence of the specified day-of-week before the date being adjusted 452c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * unless it is already on that day in which case the same object is returned. 453c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * <p> 454c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * The ISO calendar system behaves as follows:<br> 455c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * The input 2011-01-15 (a Saturday) for parameter (MONDAY) will return 2011-01-10 (five days earlier).<br> 456c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * The input 2011-01-15 (a Saturday) for parameter (WEDNESDAY) will return 2011-01-12 (three days earlier).<br> 457c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * The input 2011-01-15 (a Saturday) for parameter (SATURDAY) will return 2011-01-15 (same as input). 458c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * <p> 459c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * The behavior is suitable for use with most calendar systems. 460c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * It uses the {@code DAY_OF_WEEK} field and the {@code DAYS} unit, 461c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * and assumes a seven day week. 462c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * 463c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * @param dayOfWeek the day-of-week to check for or move the date to, not null 464c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer * @return the previous-or-same day-of-week adjuster, not null 465c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer */ 466c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer public static TemporalAdjuster previousOrSame(DayOfWeek dayOfWeek) { 467c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer int dowValue = dayOfWeek.getValue(); 468c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer return (temporal) -> { 469c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer int calDow = temporal.get(DAY_OF_WEEK); 470c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer if (calDow == dowValue) { 471c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer return temporal; 472c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer } 473c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer int daysDiff = dowValue - calDow; 474c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer return temporal.minus(daysDiff >= 0 ? 7 - daysDiff : -daysDiff, DAYS); 475c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer }; 476c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer } 477c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer 478c9dd3385ea6f927052783f42fb1282fb093e636eJoachim Sauer} 479