| /* |
| * Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| /* |
| * This file is available under and governed by the GNU General Public |
| * License version 2 only, as published by the Free Software Foundation. |
| * However, the following notice accompanied the original version of this |
| * file: |
| * |
| * Copyright (c) 2011-2012, Stephen Colebourne & Michael Nascimento Santos |
| * |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are met: |
| * |
| * * Redistributions of source code must retain the above copyright notice, |
| * this list of conditions and the following disclaimer. |
| * |
| * * Redistributions in binary form must reproduce the above copyright notice, |
| * this list of conditions and the following disclaimer in the documentation |
| * and/or other materials provided with the distribution. |
| * |
| * * Neither the name of JSR-310 nor the names of its contributors |
| * may be used to endorse or promote products derived from this software |
| * without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR |
| * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF |
| * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
| * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
| * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| package java.time.temporal; |
| |
| import android.icu.text.DateTimePatternGenerator; |
| import android.icu.util.Calendar; |
| import android.icu.util.ULocale; |
| |
| import static java.time.temporal.ChronoField.DAY_OF_MONTH; |
| import static java.time.temporal.ChronoField.DAY_OF_WEEK; |
| import static java.time.temporal.ChronoField.DAY_OF_YEAR; |
| import static java.time.temporal.ChronoField.MONTH_OF_YEAR; |
| import static java.time.temporal.ChronoField.YEAR; |
| import static java.time.temporal.ChronoUnit.DAYS; |
| import static java.time.temporal.ChronoUnit.FOREVER; |
| import static java.time.temporal.ChronoUnit.MONTHS; |
| import static java.time.temporal.ChronoUnit.WEEKS; |
| import static java.time.temporal.ChronoUnit.YEARS; |
| |
| import java.io.IOException; |
| import java.io.InvalidObjectException; |
| import java.io.ObjectInputStream; |
| import java.io.Serializable; |
| import java.time.DateTimeException; |
| import java.time.DayOfWeek; |
| import java.time.chrono.ChronoLocalDate; |
| import java.time.chrono.Chronology; |
| import java.time.format.ResolverStyle; |
| import java.util.Locale; |
| import java.util.Map; |
| import java.util.Objects; |
| import java.util.concurrent.ConcurrentHashMap; |
| import java.util.concurrent.ConcurrentMap; |
| |
| /** |
| * Localized definitions of the day-of-week, week-of-month and week-of-year fields. |
| * <p> |
| * A standard week is seven days long, but cultures have different definitions for some |
| * other aspects of a week. This class represents the definition of the week, for the |
| * purpose of providing {@link TemporalField} instances. |
| * <p> |
| * WeekFields provides five fields, |
| * {@link #dayOfWeek()}, {@link #weekOfMonth()}, {@link #weekOfYear()}, |
| * {@link #weekOfWeekBasedYear()}, and {@link #weekBasedYear()} |
| * that provide access to the values from any {@linkplain Temporal temporal object}. |
| * <p> |
| * The computations for day-of-week, week-of-month, and week-of-year are based |
| * on the {@linkplain ChronoField#YEAR proleptic-year}, |
| * {@linkplain ChronoField#MONTH_OF_YEAR month-of-year}, |
| * {@linkplain ChronoField#DAY_OF_MONTH day-of-month}, and |
| * {@linkplain ChronoField#DAY_OF_WEEK ISO day-of-week} which are based on the |
| * {@linkplain ChronoField#EPOCH_DAY epoch-day} and the chronology. |
| * The values may not be aligned with the {@linkplain ChronoField#YEAR_OF_ERA year-of-Era} |
| * depending on the Chronology. |
| * <p>A week is defined by: |
| * <ul> |
| * <li>The first day-of-week. |
| * For example, the ISO-8601 standard considers Monday to be the first day-of-week. |
| * <li>The minimal number of days in the first week. |
| * For example, the ISO-8601 standard counts the first week as needing at least 4 days. |
| * </ul> |
| * Together these two values allow a year or month to be divided into weeks. |
| * |
| * <h3>Week of Month</h3> |
| * One field is used: week-of-month. |
| * The calculation ensures that weeks never overlap a month boundary. |
| * The month is divided into periods where each period starts on the defined first day-of-week. |
| * The earliest period is referred to as week 0 if it has less than the minimal number of days |
| * and week 1 if it has at least the minimal number of days. |
| * |
| * <table cellpadding="0" cellspacing="3" border="0" style="text-align: left; width: 50%;"> |
| * <caption>Examples of WeekFields</caption> |
| * <tr><th>Date</th><td>Day-of-week</td> |
| * <td>First day: Monday<br>Minimal days: 4</td><td>First day: Monday<br>Minimal days: 5</td></tr> |
| * <tr><th>2008-12-31</th><td>Wednesday</td> |
| * <td>Week 5 of December 2008</td><td>Week 5 of December 2008</td></tr> |
| * <tr><th>2009-01-01</th><td>Thursday</td> |
| * <td>Week 1 of January 2009</td><td>Week 0 of January 2009</td></tr> |
| * <tr><th>2009-01-04</th><td>Sunday</td> |
| * <td>Week 1 of January 2009</td><td>Week 0 of January 2009</td></tr> |
| * <tr><th>2009-01-05</th><td>Monday</td> |
| * <td>Week 2 of January 2009</td><td>Week 1 of January 2009</td></tr> |
| * </table> |
| * |
| * <h3>Week of Year</h3> |
| * One field is used: week-of-year. |
| * The calculation ensures that weeks never overlap a year boundary. |
| * The year is divided into periods where each period starts on the defined first day-of-week. |
| * The earliest period is referred to as week 0 if it has less than the minimal number of days |
| * and week 1 if it has at least the minimal number of days. |
| * |
| * <h3>Week Based Year</h3> |
| * Two fields are used for week-based-year, one for the |
| * {@link #weekOfWeekBasedYear() week-of-week-based-year} and one for |
| * {@link #weekBasedYear() week-based-year}. In a week-based-year, each week |
| * belongs to only a single year. Week 1 of a year is the first week that |
| * starts on the first day-of-week and has at least the minimum number of days. |
| * The first and last weeks of a year may contain days from the |
| * previous calendar year or next calendar year respectively. |
| * |
| * <table cellpadding="0" cellspacing="3" border="0" style="text-align: left; width: 50%;"> |
| * <caption>Examples of WeekFields for week-based-year</caption> |
| * <tr><th>Date</th><td>Day-of-week</td> |
| * <td>First day: Monday<br>Minimal days: 4</td><td>First day: Monday<br>Minimal days: 5</td></tr> |
| * <tr><th>2008-12-31</th><td>Wednesday</td> |
| * <td>Week 1 of 2009</td><td>Week 53 of 2008</td></tr> |
| * <tr><th>2009-01-01</th><td>Thursday</td> |
| * <td>Week 1 of 2009</td><td>Week 53 of 2008</td></tr> |
| * <tr><th>2009-01-04</th><td>Sunday</td> |
| * <td>Week 1 of 2009</td><td>Week 53 of 2008</td></tr> |
| * <tr><th>2009-01-05</th><td>Monday</td> |
| * <td>Week 2 of 2009</td><td>Week 1 of 2009</td></tr> |
| * </table> |
| * |
| * @implSpec |
| * This class is immutable and thread-safe. |
| * |
| * @since 1.8 |
| */ |
| public final class WeekFields implements Serializable { |
| // implementation notes |
| // querying week-of-month or week-of-year should return the week value bound within the month/year |
| // however, setting the week value should be lenient (use plus/minus weeks) |
| // allow week-of-month outer range [0 to 6] |
| // allow week-of-year outer range [0 to 54] |
| // this is because callers shouldn't be expected to know the details of validity |
| |
| /** |
| * The cache of rules by firstDayOfWeek plus minimalDays. |
| * Initialized first to be available for definition of ISO, etc. |
| */ |
| private static final ConcurrentMap<String, WeekFields> CACHE = new ConcurrentHashMap<>(4, 0.75f, 2); |
| |
| /** |
| * The ISO-8601 definition, where a week starts on Monday and the first week |
| * has a minimum of 4 days. |
| * <p> |
| * The ISO-8601 standard defines a calendar system based on weeks. |
| * It uses the week-based-year and week-of-week-based-year concepts to split |
| * up the passage of days instead of the standard year/month/day. |
| * <p> |
| * Note that the first week may start in the previous calendar year. |
| * Note also that the first few days of a calendar year may be in the |
| * week-based-year corresponding to the previous calendar year. |
| */ |
| public static final WeekFields ISO = new WeekFields(DayOfWeek.MONDAY, 4); |
| |
| /** |
| * The common definition of a week that starts on Sunday and the first week |
| * has a minimum of 1 day. |
| * <p> |
| * Defined as starting on Sunday and with a minimum of 1 day in the month. |
| * This week definition is in use in the US and other European countries. |
| */ |
| public static final WeekFields SUNDAY_START = WeekFields.of(DayOfWeek.SUNDAY, 1); |
| |
| /** |
| * The unit that represents week-based-years for the purpose of addition and subtraction. |
| * <p> |
| * This allows a number of week-based-years to be added to, or subtracted from, a date. |
| * The unit is equal to either 52 or 53 weeks. |
| * The estimated duration of a week-based-year is the same as that of a standard ISO |
| * year at {@code 365.2425 Days}. |
| * <p> |
| * The rules for addition add the number of week-based-years to the existing value |
| * for the week-based-year field retaining the week-of-week-based-year |
| * and day-of-week, unless the week number it too large for the target year. |
| * In that case, the week is set to the last week of the year |
| * with the same day-of-week. |
| * <p> |
| * This unit is an immutable and thread-safe singleton. |
| */ |
| public static final TemporalUnit WEEK_BASED_YEARS = IsoFields.WEEK_BASED_YEARS; |
| |
| /** |
| * Serialization version. |
| */ |
| private static final long serialVersionUID = -1177360819670808121L; |
| |
| /** |
| * The first day-of-week. |
| */ |
| private final DayOfWeek firstDayOfWeek; |
| /** |
| * The minimal number of days in the first week. |
| */ |
| private final int minimalDays; |
| /** |
| * The field used to access the computed DayOfWeek. |
| */ |
| private final transient TemporalField dayOfWeek = ComputedDayOfField.ofDayOfWeekField(this); |
| /** |
| * The field used to access the computed WeekOfMonth. |
| */ |
| private final transient TemporalField weekOfMonth = ComputedDayOfField.ofWeekOfMonthField(this); |
| /** |
| * The field used to access the computed WeekOfYear. |
| */ |
| private final transient TemporalField weekOfYear = ComputedDayOfField.ofWeekOfYearField(this); |
| /** |
| * The field that represents the week-of-week-based-year. |
| * <p> |
| * This field allows the week of the week-based-year value to be queried and set. |
| * <p> |
| * This unit is an immutable and thread-safe singleton. |
| */ |
| private final transient TemporalField weekOfWeekBasedYear = ComputedDayOfField.ofWeekOfWeekBasedYearField(this); |
| /** |
| * The field that represents the week-based-year. |
| * <p> |
| * This field allows the week-based-year value to be queried and set. |
| * <p> |
| * This unit is an immutable and thread-safe singleton. |
| */ |
| private final transient TemporalField weekBasedYear = ComputedDayOfField.ofWeekBasedYearField(this); |
| |
| //----------------------------------------------------------------------- |
| /** |
| * Obtains an instance of {@code WeekFields} appropriate for a locale. |
| * <p> |
| * This will look up appropriate values from the provider of localization data. |
| * |
| * @param locale the locale to use, not null |
| * @return the week-definition, not null |
| */ |
| public static WeekFields of(Locale locale) { |
| Objects.requireNonNull(locale, "locale"); |
| // Android-changed: get Week data from ICU4J |
| ULocale ulocale = ULocale.forLocale(locale); |
| String region = ULocale.getRegionForSupplementalData(ulocale, /* inferRegion */ true); |
| Calendar.WeekData weekData = Calendar.getWeekDataForRegion(region); |
| DayOfWeek dow = DayOfWeek.SUNDAY.plus(weekData.firstDayOfWeek - 1); |
| return WeekFields.of(dow, weekData.minimalDaysInFirstWeek); |
| } |
| |
| /** |
| * Obtains an instance of {@code WeekFields} from the first day-of-week and minimal days. |
| * <p> |
| * The first day-of-week defines the ISO {@code DayOfWeek} that is day 1 of the week. |
| * The minimal number of days in the first week defines how many days must be present |
| * in a month or year, starting from the first day-of-week, before the week is counted |
| * as the first week. A value of 1 will count the first day of the month or year as part |
| * of the first week, whereas a value of 7 will require the whole seven days to be in |
| * the new month or year. |
| * <p> |
| * WeekFields instances are singletons; for each unique combination |
| * of {@code firstDayOfWeek} and {@code minimalDaysInFirstWeek} the |
| * the same instance will be returned. |
| * |
| * @param firstDayOfWeek the first day of the week, not null |
| * @param minimalDaysInFirstWeek the minimal number of days in the first week, from 1 to 7 |
| * @return the week-definition, not null |
| * @throws IllegalArgumentException if the minimal days value is less than one |
| * or greater than 7 |
| */ |
| public static WeekFields of(DayOfWeek firstDayOfWeek, int minimalDaysInFirstWeek) { |
| String key = firstDayOfWeek.toString() + minimalDaysInFirstWeek; |
| WeekFields rules = CACHE.get(key); |
| if (rules == null) { |
| rules = new WeekFields(firstDayOfWeek, minimalDaysInFirstWeek); |
| CACHE.putIfAbsent(key, rules); |
| rules = CACHE.get(key); |
| } |
| return rules; |
| } |
| |
| //----------------------------------------------------------------------- |
| /** |
| * Creates an instance of the definition. |
| * |
| * @param firstDayOfWeek the first day of the week, not null |
| * @param minimalDaysInFirstWeek the minimal number of days in the first week, from 1 to 7 |
| * @throws IllegalArgumentException if the minimal days value is invalid |
| */ |
| private WeekFields(DayOfWeek firstDayOfWeek, int minimalDaysInFirstWeek) { |
| Objects.requireNonNull(firstDayOfWeek, "firstDayOfWeek"); |
| if (minimalDaysInFirstWeek < 1 || minimalDaysInFirstWeek > 7) { |
| throw new IllegalArgumentException("Minimal number of days is invalid"); |
| } |
| this.firstDayOfWeek = firstDayOfWeek; |
| this.minimalDays = minimalDaysInFirstWeek; |
| } |
| |
| //----------------------------------------------------------------------- |
| /** |
| * Restore the state of a WeekFields from the stream. |
| * Check that the values are valid. |
| * |
| * @param s the stream to read |
| * @throws InvalidObjectException if the serialized object has an invalid |
| * value for firstDayOfWeek or minimalDays. |
| * @throws ClassNotFoundException if a class cannot be resolved |
| */ |
| private void readObject(ObjectInputStream s) |
| throws IOException, ClassNotFoundException, InvalidObjectException |
| { |
| s.defaultReadObject(); |
| if (firstDayOfWeek == null) { |
| throw new InvalidObjectException("firstDayOfWeek is null"); |
| } |
| |
| if (minimalDays < 1 || minimalDays > 7) { |
| throw new InvalidObjectException("Minimal number of days is invalid"); |
| } |
| } |
| |
| /** |
| * Return the singleton WeekFields associated with the |
| * {@code firstDayOfWeek} and {@code minimalDays}. |
| * @return the singleton WeekFields for the firstDayOfWeek and minimalDays. |
| * @throws InvalidObjectException if the serialized object has invalid |
| * values for firstDayOfWeek or minimalDays. |
| */ |
| private Object readResolve() throws InvalidObjectException { |
| try { |
| return WeekFields.of(firstDayOfWeek, minimalDays); |
| } catch (IllegalArgumentException iae) { |
| throw new InvalidObjectException("Invalid serialized WeekFields: " + iae.getMessage()); |
| } |
| } |
| |
| //----------------------------------------------------------------------- |
| /** |
| * Gets the first day-of-week. |
| * <p> |
| * The first day-of-week varies by culture. |
| * For example, the US uses Sunday, while France and the ISO-8601 standard use Monday. |
| * This method returns the first day using the standard {@code DayOfWeek} enum. |
| * |
| * @return the first day-of-week, not null |
| */ |
| public DayOfWeek getFirstDayOfWeek() { |
| return firstDayOfWeek; |
| } |
| |
| /** |
| * Gets the minimal number of days in the first week. |
| * <p> |
| * The number of days considered to define the first week of a month or year |
| * varies by culture. |
| * For example, the ISO-8601 requires 4 days (more than half a week) to |
| * be present before counting the first week. |
| * |
| * @return the minimal number of days in the first week of a month or year, from 1 to 7 |
| */ |
| public int getMinimalDaysInFirstWeek() { |
| return minimalDays; |
| } |
| |
| //----------------------------------------------------------------------- |
| /** |
| * Returns a field to access the day of week based on this {@code WeekFields}. |
| * <p> |
| * This is similar to {@link ChronoField#DAY_OF_WEEK} but uses values for |
| * the day-of-week based on this {@code WeekFields}. |
| * The days are numbered from 1 to 7 where the |
| * {@link #getFirstDayOfWeek() first day-of-week} is assigned the value 1. |
| * <p> |
| * For example, if the first day-of-week is Sunday, then that will have the |
| * value 1, with other days ranging from Monday as 2 to Saturday as 7. |
| * <p> |
| * In the resolving phase of parsing, a localized day-of-week will be converted |
| * to a standardized {@code ChronoField} day-of-week. |
| * The day-of-week must be in the valid range 1 to 7. |
| * Other fields in this class build dates using the standardized day-of-week. |
| * |
| * @return a field providing access to the day-of-week with localized numbering, not null |
| */ |
| public TemporalField dayOfWeek() { |
| return dayOfWeek; |
| } |
| |
| /** |
| * Returns a field to access the week of month based on this {@code WeekFields}. |
| * <p> |
| * This represents the concept of the count of weeks within the month where weeks |
| * start on a fixed day-of-week, such as Monday. |
| * This field is typically used with {@link WeekFields#dayOfWeek()}. |
| * <p> |
| * Week one (1) is the week starting on the {@link WeekFields#getFirstDayOfWeek} |
| * where there are at least {@link WeekFields#getMinimalDaysInFirstWeek()} days in the month. |
| * Thus, week one may start up to {@code minDays} days before the start of the month. |
| * If the first week starts after the start of the month then the period before is week zero (0). |
| * <p> |
| * For example:<br> |
| * - if the 1st day of the month is a Monday, week one starts on the 1st and there is no week zero<br> |
| * - if the 2nd day of the month is a Monday, week one starts on the 2nd and the 1st is in week zero<br> |
| * - if the 4th day of the month is a Monday, week one starts on the 4th and the 1st to 3rd is in week zero<br> |
| * - if the 5th day of the month is a Monday, week two starts on the 5th and the 1st to 4th is in week one<br> |
| * <p> |
| * This field can be used with any calendar system. |
| * <p> |
| * In the resolving phase of parsing, a date can be created from a year, |
| * week-of-month, month-of-year and day-of-week. |
| * <p> |
| * In {@linkplain ResolverStyle#STRICT strict mode}, all four fields are |
| * validated against their range of valid values. The week-of-month field |
| * is validated to ensure that the resulting month is the month requested. |
| * <p> |
| * In {@linkplain ResolverStyle#SMART smart mode}, all four fields are |
| * validated against their range of valid values. The week-of-month field |
| * is validated from 0 to 6, meaning that the resulting date can be in a |
| * different month to that specified. |
| * <p> |
| * In {@linkplain ResolverStyle#LENIENT lenient mode}, the year and day-of-week |
| * are validated against the range of valid values. The resulting date is calculated |
| * equivalent to the following four stage approach. |
| * First, create a date on the first day of the first week of January in the requested year. |
| * Then take the month-of-year, subtract one, and add the amount in months to the date. |
| * Then take the week-of-month, subtract one, and add the amount in weeks to the date. |
| * Finally, adjust to the correct day-of-week within the localized week. |
| * |
| * @return a field providing access to the week-of-month, not null |
| */ |
| public TemporalField weekOfMonth() { |
| return weekOfMonth; |
| } |
| |
| /** |
| * Returns a field to access the week of year based on this {@code WeekFields}. |
| * <p> |
| * This represents the concept of the count of weeks within the year where weeks |
| * start on a fixed day-of-week, such as Monday. |
| * This field is typically used with {@link WeekFields#dayOfWeek()}. |
| * <p> |
| * Week one(1) is the week starting on the {@link WeekFields#getFirstDayOfWeek} |
| * where there are at least {@link WeekFields#getMinimalDaysInFirstWeek()} days in the year. |
| * Thus, week one may start up to {@code minDays} days before the start of the year. |
| * If the first week starts after the start of the year then the period before is week zero (0). |
| * <p> |
| * For example:<br> |
| * - if the 1st day of the year is a Monday, week one starts on the 1st and there is no week zero<br> |
| * - if the 2nd day of the year is a Monday, week one starts on the 2nd and the 1st is in week zero<br> |
| * - if the 4th day of the year is a Monday, week one starts on the 4th and the 1st to 3rd is in week zero<br> |
| * - if the 5th day of the year is a Monday, week two starts on the 5th and the 1st to 4th is in week one<br> |
| * <p> |
| * This field can be used with any calendar system. |
| * <p> |
| * In the resolving phase of parsing, a date can be created from a year, |
| * week-of-year and day-of-week. |
| * <p> |
| * In {@linkplain ResolverStyle#STRICT strict mode}, all three fields are |
| * validated against their range of valid values. The week-of-year field |
| * is validated to ensure that the resulting year is the year requested. |
| * <p> |
| * In {@linkplain ResolverStyle#SMART smart mode}, all three fields are |
| * validated against their range of valid values. The week-of-year field |
| * is validated from 0 to 54, meaning that the resulting date can be in a |
| * different year to that specified. |
| * <p> |
| * In {@linkplain ResolverStyle#LENIENT lenient mode}, the year and day-of-week |
| * are validated against the range of valid values. The resulting date is calculated |
| * equivalent to the following three stage approach. |
| * First, create a date on the first day of the first week in the requested year. |
| * Then take the week-of-year, subtract one, and add the amount in weeks to the date. |
| * Finally, adjust to the correct day-of-week within the localized week. |
| * |
| * @return a field providing access to the week-of-year, not null |
| */ |
| public TemporalField weekOfYear() { |
| return weekOfYear; |
| } |
| |
| /** |
| * Returns a field to access the week of a week-based-year based on this {@code WeekFields}. |
| * <p> |
| * This represents the concept of the count of weeks within the year where weeks |
| * start on a fixed day-of-week, such as Monday and each week belongs to exactly one year. |
| * This field is typically used with {@link WeekFields#dayOfWeek()} and |
| * {@link WeekFields#weekBasedYear()}. |
| * <p> |
| * Week one(1) is the week starting on the {@link WeekFields#getFirstDayOfWeek} |
| * where there are at least {@link WeekFields#getMinimalDaysInFirstWeek()} days in the year. |
| * If the first week starts after the start of the year then the period before |
| * is in the last week of the previous year. |
| * <p> |
| * For example:<br> |
| * - if the 1st day of the year is a Monday, week one starts on the 1st<br> |
| * - if the 2nd day of the year is a Monday, week one starts on the 2nd and |
| * the 1st is in the last week of the previous year<br> |
| * - if the 4th day of the year is a Monday, week one starts on the 4th and |
| * the 1st to 3rd is in the last week of the previous year<br> |
| * - if the 5th day of the year is a Monday, week two starts on the 5th and |
| * the 1st to 4th is in week one<br> |
| * <p> |
| * This field can be used with any calendar system. |
| * <p> |
| * In the resolving phase of parsing, a date can be created from a week-based-year, |
| * week-of-year and day-of-week. |
| * <p> |
| * In {@linkplain ResolverStyle#STRICT strict mode}, all three fields are |
| * validated against their range of valid values. The week-of-year field |
| * is validated to ensure that the resulting week-based-year is the |
| * week-based-year requested. |
| * <p> |
| * In {@linkplain ResolverStyle#SMART smart mode}, all three fields are |
| * validated against their range of valid values. The week-of-week-based-year field |
| * is validated from 1 to 53, meaning that the resulting date can be in the |
| * following week-based-year to that specified. |
| * <p> |
| * In {@linkplain ResolverStyle#LENIENT lenient mode}, the year and day-of-week |
| * are validated against the range of valid values. The resulting date is calculated |
| * equivalent to the following three stage approach. |
| * First, create a date on the first day of the first week in the requested week-based-year. |
| * Then take the week-of-week-based-year, subtract one, and add the amount in weeks to the date. |
| * Finally, adjust to the correct day-of-week within the localized week. |
| * |
| * @return a field providing access to the week-of-week-based-year, not null |
| */ |
| public TemporalField weekOfWeekBasedYear() { |
| return weekOfWeekBasedYear; |
| } |
| |
| /** |
| * Returns a field to access the year of a week-based-year based on this {@code WeekFields}. |
| * <p> |
| * This represents the concept of the year where weeks start on a fixed day-of-week, |
| * such as Monday and each week belongs to exactly one year. |
| * This field is typically used with {@link WeekFields#dayOfWeek()} and |
| * {@link WeekFields#weekOfWeekBasedYear()}. |
| * <p> |
| * Week one(1) is the week starting on the {@link WeekFields#getFirstDayOfWeek} |
| * where there are at least {@link WeekFields#getMinimalDaysInFirstWeek()} days in the year. |
| * Thus, week one may start before the start of the year. |
| * If the first week starts after the start of the year then the period before |
| * is in the last week of the previous year. |
| * <p> |
| * This field can be used with any calendar system. |
| * <p> |
| * In the resolving phase of parsing, a date can be created from a week-based-year, |
| * week-of-year and day-of-week. |
| * <p> |
| * In {@linkplain ResolverStyle#STRICT strict mode}, all three fields are |
| * validated against their range of valid values. The week-of-year field |
| * is validated to ensure that the resulting week-based-year is the |
| * week-based-year requested. |
| * <p> |
| * In {@linkplain ResolverStyle#SMART smart mode}, all three fields are |
| * validated against their range of valid values. The week-of-week-based-year field |
| * is validated from 1 to 53, meaning that the resulting date can be in the |
| * following week-based-year to that specified. |
| * <p> |
| * In {@linkplain ResolverStyle#LENIENT lenient mode}, the year and day-of-week |
| * are validated against the range of valid values. The resulting date is calculated |
| * equivalent to the following three stage approach. |
| * First, create a date on the first day of the first week in the requested week-based-year. |
| * Then take the week-of-week-based-year, subtract one, and add the amount in weeks to the date. |
| * Finally, adjust to the correct day-of-week within the localized week. |
| * |
| * @return a field providing access to the week-based-year, not null |
| */ |
| public TemporalField weekBasedYear() { |
| return weekBasedYear; |
| } |
| |
| //----------------------------------------------------------------------- |
| /** |
| * Checks if this {@code WeekFields} is equal to the specified object. |
| * <p> |
| * The comparison is based on the entire state of the rules, which is |
| * the first day-of-week and minimal days. |
| * |
| * @param object the other rules to compare to, null returns false |
| * @return true if this is equal to the specified rules |
| */ |
| @Override |
| public boolean equals(Object object) { |
| if (this == object) { |
| return true; |
| } |
| if (object instanceof WeekFields) { |
| return hashCode() == object.hashCode(); |
| } |
| return false; |
| } |
| |
| /** |
| * A hash code for this {@code WeekFields}. |
| * |
| * @return a suitable hash code |
| */ |
| @Override |
| public int hashCode() { |
| return firstDayOfWeek.ordinal() * 7 + minimalDays; |
| } |
| |
| //----------------------------------------------------------------------- |
| /** |
| * A string representation of this {@code WeekFields} instance. |
| * |
| * @return the string representation, not null |
| */ |
| @Override |
| public String toString() { |
| return "WeekFields[" + firstDayOfWeek + ',' + minimalDays + ']'; |
| } |
| |
| //----------------------------------------------------------------------- |
| /** |
| * Field type that computes DayOfWeek, WeekOfMonth, and WeekOfYear |
| * based on a WeekFields. |
| * A separate Field instance is required for each different WeekFields; |
| * combination of start of week and minimum number of days. |
| * Constructors are provided to create fields for DayOfWeek, WeekOfMonth, |
| * and WeekOfYear. |
| */ |
| static class ComputedDayOfField implements TemporalField { |
| |
| /** |
| * Returns a field to access the day of week, |
| * computed based on a WeekFields. |
| * <p> |
| * The WeekDefintion of the first day of the week is used with |
| * the ISO DAY_OF_WEEK field to compute week boundaries. |
| */ |
| static ComputedDayOfField ofDayOfWeekField(WeekFields weekDef) { |
| return new ComputedDayOfField("DayOfWeek", weekDef, DAYS, WEEKS, DAY_OF_WEEK_RANGE); |
| } |
| |
| /** |
| * Returns a field to access the week of month, |
| * computed based on a WeekFields. |
| * @see WeekFields#weekOfMonth() |
| */ |
| static ComputedDayOfField ofWeekOfMonthField(WeekFields weekDef) { |
| return new ComputedDayOfField("WeekOfMonth", weekDef, WEEKS, MONTHS, WEEK_OF_MONTH_RANGE); |
| } |
| |
| /** |
| * Returns a field to access the week of year, |
| * computed based on a WeekFields. |
| * @see WeekFields#weekOfYear() |
| */ |
| static ComputedDayOfField ofWeekOfYearField(WeekFields weekDef) { |
| return new ComputedDayOfField("WeekOfYear", weekDef, WEEKS, YEARS, WEEK_OF_YEAR_RANGE); |
| } |
| |
| /** |
| * Returns a field to access the week of week-based-year, |
| * computed based on a WeekFields. |
| * @see WeekFields#weekOfWeekBasedYear() |
| */ |
| static ComputedDayOfField ofWeekOfWeekBasedYearField(WeekFields weekDef) { |
| return new ComputedDayOfField("WeekOfWeekBasedYear", weekDef, WEEKS, IsoFields.WEEK_BASED_YEARS, WEEK_OF_WEEK_BASED_YEAR_RANGE); |
| } |
| |
| /** |
| * Returns a field to access the week of week-based-year, |
| * computed based on a WeekFields. |
| * @see WeekFields#weekBasedYear() |
| */ |
| static ComputedDayOfField ofWeekBasedYearField(WeekFields weekDef) { |
| return new ComputedDayOfField("WeekBasedYear", weekDef, IsoFields.WEEK_BASED_YEARS, FOREVER, ChronoField.YEAR.range()); |
| } |
| |
| /** |
| * Return a new week-based-year date of the Chronology, year, week-of-year, |
| * and dow of week. |
| * @param chrono The chronology of the new date |
| * @param yowby the year of the week-based-year |
| * @param wowby the week of the week-based-year |
| * @param dow the day of the week |
| * @return a ChronoLocalDate for the requested year, week of year, and day of week |
| */ |
| private ChronoLocalDate ofWeekBasedYear(Chronology chrono, |
| int yowby, int wowby, int dow) { |
| ChronoLocalDate date = chrono.date(yowby, 1, 1); |
| int ldow = localizedDayOfWeek(date); |
| int offset = startOfWeekOffset(1, ldow); |
| |
| // Clamp the week of year to keep it in the same year |
| int yearLen = date.lengthOfYear(); |
| int newYearWeek = computeWeek(offset, yearLen + weekDef.getMinimalDaysInFirstWeek()); |
| wowby = Math.min(wowby, newYearWeek - 1); |
| |
| int days = -offset + (dow - 1) + (wowby - 1) * 7; |
| return date.plus(days, DAYS); |
| } |
| |
| private final String name; |
| private final WeekFields weekDef; |
| private final TemporalUnit baseUnit; |
| private final TemporalUnit rangeUnit; |
| private final ValueRange range; |
| |
| private ComputedDayOfField(String name, WeekFields weekDef, TemporalUnit baseUnit, TemporalUnit rangeUnit, ValueRange range) { |
| this.name = name; |
| this.weekDef = weekDef; |
| this.baseUnit = baseUnit; |
| this.rangeUnit = rangeUnit; |
| this.range = range; |
| } |
| |
| private static final ValueRange DAY_OF_WEEK_RANGE = ValueRange.of(1, 7); |
| private static final ValueRange WEEK_OF_MONTH_RANGE = ValueRange.of(0, 1, 4, 6); |
| private static final ValueRange WEEK_OF_YEAR_RANGE = ValueRange.of(0, 1, 52, 54); |
| private static final ValueRange WEEK_OF_WEEK_BASED_YEAR_RANGE = ValueRange.of(1, 52, 53); |
| |
| @Override |
| public long getFrom(TemporalAccessor temporal) { |
| if (rangeUnit == WEEKS) { // day-of-week |
| return localizedDayOfWeek(temporal); |
| } else if (rangeUnit == MONTHS) { // week-of-month |
| return localizedWeekOfMonth(temporal); |
| } else if (rangeUnit == YEARS) { // week-of-year |
| return localizedWeekOfYear(temporal); |
| } else if (rangeUnit == WEEK_BASED_YEARS) { |
| return localizedWeekOfWeekBasedYear(temporal); |
| } else if (rangeUnit == FOREVER) { |
| return localizedWeekBasedYear(temporal); |
| } else { |
| throw new IllegalStateException("unreachable, rangeUnit: " + rangeUnit + ", this: " + this); |
| } |
| } |
| |
| private int localizedDayOfWeek(TemporalAccessor temporal) { |
| int sow = weekDef.getFirstDayOfWeek().getValue(); |
| int isoDow = temporal.get(DAY_OF_WEEK); |
| return Math.floorMod(isoDow - sow, 7) + 1; |
| } |
| |
| private int localizedDayOfWeek(int isoDow) { |
| int sow = weekDef.getFirstDayOfWeek().getValue(); |
| return Math.floorMod(isoDow - sow, 7) + 1; |
| } |
| |
| private long localizedWeekOfMonth(TemporalAccessor temporal) { |
| int dow = localizedDayOfWeek(temporal); |
| int dom = temporal.get(DAY_OF_MONTH); |
| int offset = startOfWeekOffset(dom, dow); |
| return computeWeek(offset, dom); |
| } |
| |
| private long localizedWeekOfYear(TemporalAccessor temporal) { |
| int dow = localizedDayOfWeek(temporal); |
| int doy = temporal.get(DAY_OF_YEAR); |
| int offset = startOfWeekOffset(doy, dow); |
| return computeWeek(offset, doy); |
| } |
| |
| /** |
| * Returns the year of week-based-year for the temporal. |
| * The year can be the previous year, the current year, or the next year. |
| * @param temporal a date of any chronology, not null |
| * @return the year of week-based-year for the date |
| */ |
| private int localizedWeekBasedYear(TemporalAccessor temporal) { |
| int dow = localizedDayOfWeek(temporal); |
| int year = temporal.get(YEAR); |
| int doy = temporal.get(DAY_OF_YEAR); |
| int offset = startOfWeekOffset(doy, dow); |
| int week = computeWeek(offset, doy); |
| if (week == 0) { |
| // Day is in end of week of previous year; return the previous year |
| return year - 1; |
| } else { |
| // If getting close to end of year, use higher precision logic |
| // Check if date of year is in partial week associated with next year |
| ValueRange dayRange = temporal.range(DAY_OF_YEAR); |
| int yearLen = (int)dayRange.getMaximum(); |
| int newYearWeek = computeWeek(offset, yearLen + weekDef.getMinimalDaysInFirstWeek()); |
| if (week >= newYearWeek) { |
| return year + 1; |
| } |
| } |
| return year; |
| } |
| |
| /** |
| * Returns the week of week-based-year for the temporal. |
| * The week can be part of the previous year, the current year, |
| * or the next year depending on the week start and minimum number |
| * of days. |
| * @param temporal a date of any chronology |
| * @return the week of the year |
| * @see #localizedWeekBasedYear(java.time.temporal.TemporalAccessor) |
| */ |
| private int localizedWeekOfWeekBasedYear(TemporalAccessor temporal) { |
| int dow = localizedDayOfWeek(temporal); |
| int doy = temporal.get(DAY_OF_YEAR); |
| int offset = startOfWeekOffset(doy, dow); |
| int week = computeWeek(offset, doy); |
| if (week == 0) { |
| // Day is in end of week of previous year |
| // Recompute from the last day of the previous year |
| ChronoLocalDate date = Chronology.from(temporal).date(temporal); |
| date = date.minus(doy, DAYS); // Back down into previous year |
| return localizedWeekOfWeekBasedYear(date); |
| } else if (week > 50) { |
| // If getting close to end of year, use higher precision logic |
| // Check if date of year is in partial week associated with next year |
| ValueRange dayRange = temporal.range(DAY_OF_YEAR); |
| int yearLen = (int)dayRange.getMaximum(); |
| int newYearWeek = computeWeek(offset, yearLen + weekDef.getMinimalDaysInFirstWeek()); |
| if (week >= newYearWeek) { |
| // Overlaps with week of following year; reduce to week in following year |
| week = week - newYearWeek + 1; |
| } |
| } |
| return week; |
| } |
| |
| /** |
| * Returns an offset to align week start with a day of month or day of year. |
| * |
| * @param day the day; 1 through infinity |
| * @param dow the day of the week of that day; 1 through 7 |
| * @return an offset in days to align a day with the start of the first 'full' week |
| */ |
| private int startOfWeekOffset(int day, int dow) { |
| // offset of first day corresponding to the day of week in first 7 days (zero origin) |
| int weekStart = Math.floorMod(day - dow, 7); |
| int offset = -weekStart; |
| if (weekStart + 1 > weekDef.getMinimalDaysInFirstWeek()) { |
| // The previous week has the minimum days in the current month to be a 'week' |
| offset = 7 - weekStart; |
| } |
| return offset; |
| } |
| |
| /** |
| * Returns the week number computed from the reference day and reference dayOfWeek. |
| * |
| * @param offset the offset to align a date with the start of week |
| * from {@link #startOfWeekOffset}. |
| * @param day the day for which to compute the week number |
| * @return the week number where zero is used for a partial week and 1 for the first full week |
| */ |
| private int computeWeek(int offset, int day) { |
| return ((7 + offset + (day - 1)) / 7); |
| } |
| |
| @SuppressWarnings("unchecked") |
| @Override |
| public <R extends Temporal> R adjustInto(R temporal, long newValue) { |
| // Check the new value and get the old value of the field |
| int newVal = range.checkValidIntValue(newValue, this); // lenient check range |
| int currentVal = temporal.get(this); |
| if (newVal == currentVal) { |
| return temporal; |
| } |
| |
| if (rangeUnit == FOREVER) { // replace year of WeekBasedYear |
| // Create a new date object with the same chronology, |
| // the desired year and the same week and dow. |
| int idow = temporal.get(weekDef.dayOfWeek); |
| int wowby = temporal.get(weekDef.weekOfWeekBasedYear); |
| return (R) ofWeekBasedYear(Chronology.from(temporal), (int)newValue, wowby, idow); |
| } else { |
| // Compute the difference and add that using the base unit of the field |
| return (R) temporal.plus(newVal - currentVal, baseUnit); |
| } |
| } |
| |
| @Override |
| public ChronoLocalDate resolve( |
| Map<TemporalField, Long> fieldValues, TemporalAccessor partialTemporal, ResolverStyle resolverStyle) { |
| final long value = fieldValues.get(this); |
| final int newValue = Math.toIntExact(value); // broad limit makes overflow checking lighter |
| // first convert localized day-of-week to ISO day-of-week |
| // doing this first handles case where both ISO and localized were parsed and might mismatch |
| // day-of-week is always strict as two different day-of-week values makes lenient complex |
| if (rangeUnit == WEEKS) { // day-of-week |
| final int checkedValue = range.checkValidIntValue(value, this); // no leniency as too complex |
| final int startDow = weekDef.getFirstDayOfWeek().getValue(); |
| long isoDow = Math.floorMod((startDow - 1) + (checkedValue - 1), 7) + 1; |
| fieldValues.remove(this); |
| fieldValues.put(DAY_OF_WEEK, isoDow); |
| return null; |
| } |
| |
| // can only build date if ISO day-of-week is present |
| if (fieldValues.containsKey(DAY_OF_WEEK) == false) { |
| return null; |
| } |
| int isoDow = DAY_OF_WEEK.checkValidIntValue(fieldValues.get(DAY_OF_WEEK)); |
| int dow = localizedDayOfWeek(isoDow); |
| |
| // build date |
| Chronology chrono = Chronology.from(partialTemporal); |
| if (fieldValues.containsKey(YEAR)) { |
| int year = YEAR.checkValidIntValue(fieldValues.get(YEAR)); // validate |
| if (rangeUnit == MONTHS && fieldValues.containsKey(MONTH_OF_YEAR)) { // week-of-month |
| long month = fieldValues.get(MONTH_OF_YEAR); // not validated yet |
| return resolveWoM(fieldValues, chrono, year, month, newValue, dow, resolverStyle); |
| } |
| if (rangeUnit == YEARS) { // week-of-year |
| return resolveWoY(fieldValues, chrono, year, newValue, dow, resolverStyle); |
| } |
| } else if ((rangeUnit == WEEK_BASED_YEARS || rangeUnit == FOREVER) && |
| fieldValues.containsKey(weekDef.weekBasedYear) && |
| fieldValues.containsKey(weekDef.weekOfWeekBasedYear)) { // week-of-week-based-year and year-of-week-based-year |
| return resolveWBY(fieldValues, chrono, dow, resolverStyle); |
| } |
| return null; |
| } |
| |
| private ChronoLocalDate resolveWoM( |
| Map<TemporalField, Long> fieldValues, Chronology chrono, int year, long month, long wom, int localDow, ResolverStyle resolverStyle) { |
| ChronoLocalDate date; |
| if (resolverStyle == ResolverStyle.LENIENT) { |
| date = chrono.date(year, 1, 1).plus(Math.subtractExact(month, 1), MONTHS); |
| long weeks = Math.subtractExact(wom, localizedWeekOfMonth(date)); |
| int days = localDow - localizedDayOfWeek(date); // safe from overflow |
| date = date.plus(Math.addExact(Math.multiplyExact(weeks, 7), days), DAYS); |
| } else { |
| int monthValid = MONTH_OF_YEAR.checkValidIntValue(month); // validate |
| date = chrono.date(year, monthValid, 1); |
| int womInt = range.checkValidIntValue(wom, this); // validate |
| int weeks = (int) (womInt - localizedWeekOfMonth(date)); // safe from overflow |
| int days = localDow - localizedDayOfWeek(date); // safe from overflow |
| date = date.plus(weeks * 7 + days, DAYS); |
| if (resolverStyle == ResolverStyle.STRICT && date.getLong(MONTH_OF_YEAR) != month) { |
| throw new DateTimeException("Strict mode rejected resolved date as it is in a different month"); |
| } |
| } |
| fieldValues.remove(this); |
| fieldValues.remove(YEAR); |
| fieldValues.remove(MONTH_OF_YEAR); |
| fieldValues.remove(DAY_OF_WEEK); |
| return date; |
| } |
| |
| private ChronoLocalDate resolveWoY( |
| Map<TemporalField, Long> fieldValues, Chronology chrono, int year, long woy, int localDow, ResolverStyle resolverStyle) { |
| ChronoLocalDate date = chrono.date(year, 1, 1); |
| if (resolverStyle == ResolverStyle.LENIENT) { |
| long weeks = Math.subtractExact(woy, localizedWeekOfYear(date)); |
| int days = localDow - localizedDayOfWeek(date); // safe from overflow |
| date = date.plus(Math.addExact(Math.multiplyExact(weeks, 7), days), DAYS); |
| } else { |
| int womInt = range.checkValidIntValue(woy, this); // validate |
| int weeks = (int) (womInt - localizedWeekOfYear(date)); // safe from overflow |
| int days = localDow - localizedDayOfWeek(date); // safe from overflow |
| date = date.plus(weeks * 7 + days, DAYS); |
| if (resolverStyle == ResolverStyle.STRICT && date.getLong(YEAR) != year) { |
| throw new DateTimeException("Strict mode rejected resolved date as it is in a different year"); |
| } |
| } |
| fieldValues.remove(this); |
| fieldValues.remove(YEAR); |
| fieldValues.remove(DAY_OF_WEEK); |
| return date; |
| } |
| |
| private ChronoLocalDate resolveWBY( |
| Map<TemporalField, Long> fieldValues, Chronology chrono, int localDow, ResolverStyle resolverStyle) { |
| int yowby = weekDef.weekBasedYear.range().checkValidIntValue( |
| fieldValues.get(weekDef.weekBasedYear), weekDef.weekBasedYear); |
| ChronoLocalDate date; |
| if (resolverStyle == ResolverStyle.LENIENT) { |
| date = ofWeekBasedYear(chrono, yowby, 1, localDow); |
| long wowby = fieldValues.get(weekDef.weekOfWeekBasedYear); |
| long weeks = Math.subtractExact(wowby, 1); |
| date = date.plus(weeks, WEEKS); |
| } else { |
| int wowby = weekDef.weekOfWeekBasedYear.range().checkValidIntValue( |
| fieldValues.get(weekDef.weekOfWeekBasedYear), weekDef.weekOfWeekBasedYear); // validate |
| date = ofWeekBasedYear(chrono, yowby, wowby, localDow); |
| if (resolverStyle == ResolverStyle.STRICT && localizedWeekBasedYear(date) != yowby) { |
| throw new DateTimeException("Strict mode rejected resolved date as it is in a different week-based-year"); |
| } |
| } |
| fieldValues.remove(this); |
| fieldValues.remove(weekDef.weekBasedYear); |
| fieldValues.remove(weekDef.weekOfWeekBasedYear); |
| fieldValues.remove(DAY_OF_WEEK); |
| return date; |
| } |
| |
| //----------------------------------------------------------------------- |
| @Override |
| public String getDisplayName(Locale locale) { |
| Objects.requireNonNull(locale, "locale"); |
| if (rangeUnit == YEARS) { // only have values for week-of-year |
| // Android-changed: Use ICU name values. |
| DateTimePatternGenerator dateTimePatternGenerator = DateTimePatternGenerator |
| .getFrozenInstance(ULocale.forLocale(locale)); |
| String icuName = dateTimePatternGenerator |
| .getAppendItemName(DateTimePatternGenerator.WEEK_OF_YEAR); |
| return icuName != null && !icuName.isEmpty() ? icuName : name; |
| } |
| return name; |
| } |
| |
| @Override |
| public TemporalUnit getBaseUnit() { |
| return baseUnit; |
| } |
| |
| @Override |
| public TemporalUnit getRangeUnit() { |
| return rangeUnit; |
| } |
| |
| @Override |
| public boolean isDateBased() { |
| return true; |
| } |
| |
| @Override |
| public boolean isTimeBased() { |
| return false; |
| } |
| |
| @Override |
| public ValueRange range() { |
| return range; |
| } |
| |
| //----------------------------------------------------------------------- |
| @Override |
| public boolean isSupportedBy(TemporalAccessor temporal) { |
| if (temporal.isSupported(DAY_OF_WEEK)) { |
| if (rangeUnit == WEEKS) { // day-of-week |
| return true; |
| } else if (rangeUnit == MONTHS) { // week-of-month |
| return temporal.isSupported(DAY_OF_MONTH); |
| } else if (rangeUnit == YEARS) { // week-of-year |
| return temporal.isSupported(DAY_OF_YEAR); |
| } else if (rangeUnit == WEEK_BASED_YEARS) { |
| return temporal.isSupported(DAY_OF_YEAR); |
| } else if (rangeUnit == FOREVER) { |
| return temporal.isSupported(YEAR); |
| } |
| } |
| return false; |
| } |
| |
| @Override |
| public ValueRange rangeRefinedBy(TemporalAccessor temporal) { |
| if (rangeUnit == ChronoUnit.WEEKS) { // day-of-week |
| return range; |
| } else if (rangeUnit == MONTHS) { // week-of-month |
| return rangeByWeek(temporal, DAY_OF_MONTH); |
| } else if (rangeUnit == YEARS) { // week-of-year |
| return rangeByWeek(temporal, DAY_OF_YEAR); |
| } else if (rangeUnit == WEEK_BASED_YEARS) { |
| return rangeWeekOfWeekBasedYear(temporal); |
| } else if (rangeUnit == FOREVER) { |
| return YEAR.range(); |
| } else { |
| throw new IllegalStateException("unreachable, rangeUnit: " + rangeUnit + ", this: " + this); |
| } |
| } |
| |
| /** |
| * Map the field range to a week range |
| * @param temporal the temporal |
| * @param field the field to get the range of |
| * @return the ValueRange with the range adjusted to weeks. |
| */ |
| private ValueRange rangeByWeek(TemporalAccessor temporal, TemporalField field) { |
| int dow = localizedDayOfWeek(temporal); |
| int offset = startOfWeekOffset(temporal.get(field), dow); |
| ValueRange fieldRange = temporal.range(field); |
| return ValueRange.of(computeWeek(offset, (int) fieldRange.getMinimum()), |
| computeWeek(offset, (int) fieldRange.getMaximum())); |
| } |
| |
| /** |
| * Map the field range to a week range of a week year. |
| * @param temporal the temporal |
| * @return the ValueRange with the range adjusted to weeks. |
| */ |
| private ValueRange rangeWeekOfWeekBasedYear(TemporalAccessor temporal) { |
| if (!temporal.isSupported(DAY_OF_YEAR)) { |
| return WEEK_OF_YEAR_RANGE; |
| } |
| int dow = localizedDayOfWeek(temporal); |
| int doy = temporal.get(DAY_OF_YEAR); |
| int offset = startOfWeekOffset(doy, dow); |
| int week = computeWeek(offset, doy); |
| if (week == 0) { |
| // Day is in end of week of previous year |
| // Recompute from the last day of the previous year |
| ChronoLocalDate date = Chronology.from(temporal).date(temporal); |
| date = date.minus(doy + 7, DAYS); // Back down into previous year |
| return rangeWeekOfWeekBasedYear(date); |
| } |
| // Check if day of year is in partial week associated with next year |
| ValueRange dayRange = temporal.range(DAY_OF_YEAR); |
| int yearLen = (int)dayRange.getMaximum(); |
| int newYearWeek = computeWeek(offset, yearLen + weekDef.getMinimalDaysInFirstWeek()); |
| |
| if (week >= newYearWeek) { |
| // Overlaps with weeks of following year; recompute from a week in following year |
| ChronoLocalDate date = Chronology.from(temporal).date(temporal); |
| date = date.plus(yearLen - doy + 1 + 7, ChronoUnit.DAYS); |
| return rangeWeekOfWeekBasedYear(date); |
| } |
| return ValueRange.of(1, newYearWeek-1); |
| } |
| |
| //----------------------------------------------------------------------- |
| @Override |
| public String toString() { |
| return name + "[" + weekDef.toString() + "]"; |
| } |
| } |
| } |
