--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/src/share/classes/java/time/temporal/IsoFields.java Tue Feb 12 09:25:43 2013 -0800
@@ -0,0 +1,587 @@
+/*
+ * 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.
+ */
+
+/*
+ * 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 static java.time.DayOfWeek.THURSDAY;
+import static java.time.DayOfWeek.WEDNESDAY;
+import static java.time.temporal.ChronoField.DAY_OF_WEEK;
+import static java.time.temporal.ChronoField.DAY_OF_YEAR;
+import static java.time.temporal.ChronoField.EPOCH_DAY;
+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.time.DateTimeException;
+import java.time.Duration;
+import java.time.LocalDate;
+import java.time.chrono.Chronology;
+import java.time.chrono.IsoChronology;
+import java.util.HashMap;
+import java.util.Map;
+
+/**
+ * Fields and units specific to the ISO-8601 calendar system,
+ * including quarter-of-year and week-based-year.
+ * <p>
+ * This class defines fields and units that are specific to the ISO calendar system.
+ *
+ * <h3>Quarter of year</h3>
+ * The ISO-8601 standard is based on the standard civic 12 month year.
+ * This is commonly divided into four quarters, often abbreviated as Q1, Q2, Q3 and Q4.
+ * <p>
+ * January, February and March are in Q1.
+ * April, May and June are in Q2.
+ * July, August and September are in Q3.
+ * October, November and December are in Q4.
+ * <p>
+ * The complete date is expressed using three fields:
+ * <p><ul>
+ * <li>{@link #DAY_OF_QUARTER DAY_OF_QUARTER} - the day within the quarter, from 1 to 90, 91 or 92
+ * <li>{@link #QUARTER_OF_YEAR QUARTER_OF_YEAR} - the week within the week-based-year
+ * <li>{@link ChronoField#YEAR YEAR} - the standard ISO year
+ * </ul><p>
+ *
+ * <h3>Week based years</h3>
+ * The ISO-8601 standard was originally intended as a data interchange format,
+ * defining a string format for dates and times. However, it also defines an
+ * alternate way of expressing the date, based on the concept of week-based-year.
+ * <p>
+ * The date is expressed using three fields:
+ * <p><ul>
+ * <li>{@link ChronoField#DAY_OF_WEEK DAY_OF_WEEK} - the standard field defining the
+ * day-of-week from Monday (1) to Sunday (7)
+ * <li>{@link #WEEK_OF_WEEK_BASED_YEAR} - the week within the week-based-year
+ * <li>{@link #WEEK_BASED_YEAR WEEK_BASED_YEAR} - the week-based-year
+ * </ul><p>
+ * The week-based-year itself is defined relative to the standard ISO proleptic year.
+ * It differs from the standard year in that it always starts on a Monday.
+ * <p>
+ * The first week of a week-based-year is the first Monday-based week of the standard
+ * ISO year that has at least 4 days in the new year.
+ * <p><ul>
+ * <li>If January 1st is Monday then week 1 starts on January 1st
+ * <li>If January 1st is Tuesday then week 1 starts on December 31st of the previous standard year
+ * <li>If January 1st is Wednesday then week 1 starts on December 30th of the previous standard year
+ * <li>If January 1st is Thursday then week 1 starts on December 29th of the previous standard year
+ * <li>If January 1st is Friday then week 1 starts on January 4th
+ * <li>If January 1st is Saturday then week 1 starts on January 3rd
+ * <li>If January 1st is Sunday then week 1 starts on January 2nd
+ * </ul><p>
+ * There are 52 weeks in most week-based years, however on occasion there are 53 weeks.
+ * <p>
+ * For example:
+ * <p>
+ * <table cellpadding="0" cellspacing="3" border="0" style="text-align: left; width: 50%;">
+ * <caption>Examples of Week based Years</caption>
+ * <tr><th>Date</th><th>Day-of-week</th><th>Field values</th></tr>
+ * <tr><th>2008-12-28</th><td>Sunday</td><td>Week 52 of week-based-year 2008</td></tr>
+ * <tr><th>2008-12-29</th><td>Monday</td><td>Week 1 of week-based-year 2009</td></tr>
+ * <tr><th>2008-12-31</th><td>Wednesday</td><td>Week 1 of week-based-year 2009</td></tr>
+ * <tr><th>2009-01-01</th><td>Thursday</td><td>Week 1 of week-based-year 2009</td></tr>
+ * <tr><th>2009-01-04</th><td>Sunday</td><td>Week 1 of week-based-year 2009</td></tr>
+ * <tr><th>2009-01-05</th><td>Monday</td><td>Week 2 of week-based-year 2009</td></tr>
+ * </table>
+ *
+ * <h3>Specification for implementors</h3>
+ * <p>
+ * This class is immutable and thread-safe.
+ *
+ * @since 1.8
+ */
+public final class IsoFields {
+
+ /**
+ * The field that represents the day-of-quarter.
+ * <p>
+ * This field allows the day-of-quarter value to be queried and set.
+ * The day-of-quarter has values from 1 to 90 in Q1 of a standard year, from 1 to 91
+ * in Q1 of a leap year, from 1 to 91 in Q2 and from 1 to 92 in Q3 and Q4.
+ * <p>
+ * The day-of-quarter can only be calculated if the day-of-year, month-of-year and year
+ * are available.
+ * <p>
+ * When setting this field, the value is allowed to be partially lenient, taking any
+ * value from 1 to 92. If the quarter has less than 92 days, then day 92, and
+ * potentially day 91, is in the following quarter.
+ * <p>
+ * This unit is an immutable and thread-safe singleton.
+ */
+ public static final TemporalField DAY_OF_QUARTER = Field.DAY_OF_QUARTER;
+ /**
+ * The field that represents the quarter-of-year.
+ * <p>
+ * This field allows the quarter-of-year value to be queried and set.
+ * The quarter-of-year has values from 1 to 4.
+ * <p>
+ * The day-of-quarter can only be calculated if the month-of-year is available.
+ * <p>
+ * This unit is an immutable and thread-safe singleton.
+ */
+ public static final TemporalField QUARTER_OF_YEAR = Field.QUARTER_OF_YEAR;
+ /**
+ * 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.
+ */
+ public static final TemporalField WEEK_OF_WEEK_BASED_YEAR = Field.WEEK_OF_WEEK_BASED_YEAR;
+ /**
+ * 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.
+ */
+ public static final TemporalField WEEK_BASED_YEAR = Field.WEEK_BASED_YEAR;
+ /**
+ * 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. If the resulting week-based-year only has 52 weeks,
+ * then the date will be in week 1 of the following week-based-year.
+ * <p>
+ * This unit is an immutable and thread-safe singleton.
+ */
+ public static final TemporalUnit WEEK_BASED_YEARS = Unit.WEEK_BASED_YEARS;
+ /**
+ * Unit that represents the concept of a quarter-year.
+ * For the ISO calendar system, it is equal to 3 months.
+ * The estimated duration of a quarter-year is one quarter of {@code 365.2425 Days}.
+ * <p>
+ * This unit is an immutable and thread-safe singleton.
+ */
+ public static final TemporalUnit QUARTER_YEARS = Unit.QUARTER_YEARS;
+
+ /**
+ * Restricted constructor.
+ */
+ private IsoFields() {
+ throw new AssertionError("Not instantiable");
+ }
+
+ //-----------------------------------------------------------------------
+ /**
+ * Implementation of the field.
+ */
+ private static enum Field implements TemporalField {
+ DAY_OF_QUARTER {
+ @Override
+ public String getName() {
+ return "DayOfQuarter";
+ }
+ @Override
+ public TemporalUnit getBaseUnit() {
+ return DAYS;
+ }
+ @Override
+ public TemporalUnit getRangeUnit() {
+ return QUARTER_YEARS;
+ }
+ @Override
+ public ValueRange range() {
+ return ValueRange.of(1, 90, 92);
+ }
+ @Override
+ public boolean isSupportedBy(TemporalAccessor temporal) {
+ return temporal.isSupported(DAY_OF_YEAR) && temporal.isSupported(MONTH_OF_YEAR) &&
+ temporal.isSupported(YEAR) && isIso(temporal);
+ }
+ @Override
+ public ValueRange rangeRefinedBy(TemporalAccessor temporal) {
+ if (isSupportedBy(temporal) == false) {
+ throw new DateTimeException("Unsupported field: DayOfQuarter");
+ }
+ long qoy = temporal.getLong(QUARTER_OF_YEAR);
+ if (qoy == 1) {
+ long year = temporal.getLong(YEAR);
+ return (IsoChronology.INSTANCE.isLeapYear(year) ? ValueRange.of(1, 91) : ValueRange.of(1, 90));
+ } else if (qoy == 2) {
+ return ValueRange.of(1, 91);
+ } else if (qoy == 3 || qoy == 4) {
+ return ValueRange.of(1, 92);
+ } // else value not from 1 to 4, so drop through
+ return range();
+ }
+ @Override
+ public long getFrom(TemporalAccessor temporal) {
+ if (isSupportedBy(temporal) == false) {
+ throw new DateTimeException("Unsupported field: DayOfQuarter");
+ }
+ int doy = temporal.get(DAY_OF_YEAR);
+ int moy = temporal.get(MONTH_OF_YEAR);
+ long year = temporal.getLong(YEAR);
+ return doy - QUARTER_DAYS[((moy - 1) / 3) + (IsoChronology.INSTANCE.isLeapYear(year) ? 4 : 0)];
+ }
+ @SuppressWarnings("unchecked")
+ @Override
+ public <R extends Temporal> R adjustInto(R temporal, long newValue) {
+ // calls getFrom() to check if supported
+ long curValue = getFrom(temporal);
+ range().checkValidValue(newValue, this); // leniently check from 1 to 92 TODO: check
+ return (R) temporal.with(DAY_OF_YEAR, temporal.getLong(DAY_OF_YEAR) + (newValue - curValue));
+ }
+ @Override
+ public Map<TemporalField, Long> resolve(TemporalAccessor temporal, long value) {
+ if ((temporal.isSupported(YEAR) && temporal.isSupported(DAY_OF_QUARTER)) == false) {
+ return null;
+ }
+ int y = temporal.get(YEAR);
+ int qoy = temporal.get(QUARTER_OF_YEAR);
+ range().checkValidValue(value, this); // leniently check from 1 to 92 TODO: check
+ LocalDate date = LocalDate.of(y, ((qoy - 1) * 3) + 1, 1).plusDays(value - 1);
+ Map<TemporalField, Long> result = new HashMap<>(4, 1.0f);
+ result.put(EPOCH_DAY, date.toEpochDay());
+ result.put(YEAR, null);
+ result.put(QUARTER_OF_YEAR, null);
+ return result;
+ }
+ },
+ QUARTER_OF_YEAR {
+ @Override
+ public String getName() {
+ return "QuarterOfYear";
+ }
+ @Override
+ public TemporalUnit getBaseUnit() {
+ return QUARTER_YEARS;
+ }
+ @Override
+ public TemporalUnit getRangeUnit() {
+ return YEARS;
+ }
+ @Override
+ public ValueRange range() {
+ return ValueRange.of(1, 4);
+ }
+ @Override
+ public boolean isSupportedBy(TemporalAccessor temporal) {
+ return temporal.isSupported(MONTH_OF_YEAR) && isIso(temporal);
+ }
+ @Override
+ public long getFrom(TemporalAccessor temporal) {
+ if (isSupportedBy(temporal) == false) {
+ throw new DateTimeException("Unsupported field: QuarterOfYear");
+ }
+ long moy = temporal.getLong(MONTH_OF_YEAR);
+ return ((moy + 2) / 3);
+ }
+ @SuppressWarnings("unchecked")
+ @Override
+ public <R extends Temporal> R adjustInto(R temporal, long newValue) {
+ // calls getFrom() to check if supported
+ long curValue = getFrom(temporal);
+ range().checkValidValue(newValue, this); // strictly check from 1 to 4
+ return (R) temporal.with(MONTH_OF_YEAR, temporal.getLong(MONTH_OF_YEAR) + (newValue - curValue) * 3);
+ }
+ },
+ WEEK_OF_WEEK_BASED_YEAR {
+ @Override
+ public String getName() {
+ return "WeekOfWeekBasedYear";
+ }
+ @Override
+ public TemporalUnit getBaseUnit() {
+ return WEEKS;
+ }
+ @Override
+ public TemporalUnit getRangeUnit() {
+ return WEEK_BASED_YEARS;
+ }
+ @Override
+ public ValueRange range() {
+ return ValueRange.of(1, 52, 53);
+ }
+ @Override
+ public boolean isSupportedBy(TemporalAccessor temporal) {
+ return temporal.isSupported(EPOCH_DAY) && isIso(temporal);
+ }
+ @Override
+ public ValueRange rangeRefinedBy(TemporalAccessor temporal) {
+ if (isSupportedBy(temporal) == false) {
+ throw new DateTimeException("Unsupported field: WeekOfWeekBasedYear");
+ }
+ return getWeekRange(LocalDate.from(temporal));
+ }
+ @Override
+ public long getFrom(TemporalAccessor temporal) {
+ if (isSupportedBy(temporal) == false) {
+ throw new DateTimeException("Unsupported field: WeekOfWeekBasedYear");
+ }
+ return getWeek(LocalDate.from(temporal));
+ }
+ @SuppressWarnings("unchecked")
+ @Override
+ public <R extends Temporal> R adjustInto(R temporal, long newValue) {
+ // calls getFrom() to check if supported
+ range().checkValidValue(newValue, this); // lenient range
+ return (R) temporal.plus(Math.subtractExact(newValue, getFrom(temporal)), WEEKS);
+ }
+ @Override
+ public Map<TemporalField, Long> resolve(TemporalAccessor temporal, long value) {
+ if ((temporal.isSupported(WEEK_BASED_YEAR) && temporal.isSupported(DAY_OF_WEEK)) == false) {
+ return null;
+ }
+ int wby = temporal.get(WEEK_BASED_YEAR);
+ int dow = temporal.get(DAY_OF_WEEK);
+ range().checkValidValue(value, this); // lenient range
+ LocalDate date = LocalDate.of(wby, 1, 4).plusWeeks(value - 1).with(DAY_OF_WEEK, dow);
+ Map<TemporalField, Long> result = new HashMap<>(2, 1.0f);
+ result.put(EPOCH_DAY, date.toEpochDay());
+ result.put(WEEK_BASED_YEAR, null);
+ result.put(DAY_OF_WEEK, null);
+ return result;
+ }
+ },
+ WEEK_BASED_YEAR {
+ @Override
+ public String getName() {
+ return "WeekBasedYear";
+ }
+ @Override
+ public TemporalUnit getBaseUnit() {
+ return WEEK_BASED_YEARS;
+ }
+ @Override
+ public TemporalUnit getRangeUnit() {
+ return FOREVER;
+ }
+ @Override
+ public ValueRange range() {
+ return YEAR.range();
+ }
+ @Override
+ public boolean isSupportedBy(TemporalAccessor temporal) {
+ return temporal.isSupported(EPOCH_DAY) && isIso(temporal);
+ }
+ @Override
+ public long getFrom(TemporalAccessor temporal) {
+ if (isSupportedBy(temporal) == false) {
+ throw new DateTimeException("Unsupported field: WeekBasedYear");
+ }
+ return getWeekBasedYear(LocalDate.from(temporal));
+ }
+ @SuppressWarnings("unchecked")
+ @Override
+ public <R extends Temporal> R adjustInto(R temporal, long newValue) {
+ if (isSupportedBy(temporal) == false) {
+ throw new DateTimeException("Unsupported field: WeekBasedYear");
+ }
+ int newVal = range().checkValidIntValue(newValue, WEEK_BASED_YEAR); // strict check
+ LocalDate date = LocalDate.from(temporal);
+ int week = getWeek(date);
+ date = date.withDayOfYear(180).withYear(newVal).with(WEEK_OF_WEEK_BASED_YEAR, week);
+ return (R) date.with(date);
+ }
+ };
+
+ @Override
+ public ValueRange rangeRefinedBy(TemporalAccessor temporal) {
+ return range();
+ }
+
+ @Override
+ public String toString() {
+ return getName();
+ }
+
+ //-------------------------------------------------------------------------
+ private static final int[] QUARTER_DAYS = {0, 90, 181, 273, 0, 91, 182, 274};
+
+ private static boolean isIso(TemporalAccessor temporal) {
+ return Chronology.from(temporal).equals(IsoChronology.INSTANCE);
+ }
+
+ private static ValueRange getWeekRange(LocalDate date) {
+ int wby = getWeekBasedYear(date);
+ date = date.withDayOfYear(1).withYear(wby);
+ // 53 weeks if standard year starts on Thursday, or Wed in a leap year
+ if (date.getDayOfWeek() == THURSDAY || (date.getDayOfWeek() == WEDNESDAY && date.isLeapYear())) {
+ return ValueRange.of(1, 53);
+ }
+ return ValueRange.of(1, 52);
+ }
+
+ private static int getWeek(LocalDate date) {
+ int dow0 = date.getDayOfWeek().ordinal();
+ int doy0 = date.getDayOfYear() - 1;
+ int doyThu0 = doy0 + (3 - dow0); // adjust to mid-week Thursday (which is 3 indexed from zero)
+ int alignedWeek = doyThu0 / 7;
+ int firstThuDoy0 = doyThu0 - (alignedWeek * 7);
+ int firstMonDoy0 = firstThuDoy0 - 3;
+ if (firstMonDoy0 < -3) {
+ firstMonDoy0 += 7;
+ }
+ if (doy0 < firstMonDoy0) {
+ return (int) getWeekRange(date.withDayOfYear(180).minusYears(1)).getMaximum();
+ }
+ int week = ((doy0 - firstMonDoy0) / 7) + 1;
+ if (week == 53) {
+ if ((firstMonDoy0 == -3 || (firstMonDoy0 == -2 && date.isLeapYear())) == false) {
+ week = 1;
+ }
+ }
+ return week;
+ }
+
+ private static int getWeekBasedYear(LocalDate date) {
+ int year = date.getYear();
+ int doy = date.getDayOfYear();
+ if (doy <= 3) {
+ int dow = date.getDayOfWeek().ordinal();
+ if (doy - dow < -2) {
+ year--;
+ }
+ } else if (doy >= 363) {
+ int dow = date.getDayOfWeek().ordinal();
+ doy = doy - 363 - (date.isLeapYear() ? 1 : 0);
+ if (doy - dow >= 0) {
+ year++;
+ }
+ }
+ return year;
+ }
+ }
+
+ //-----------------------------------------------------------------------
+ /**
+ * Implementation of the period unit.
+ */
+ private static enum Unit implements TemporalUnit {
+
+ /**
+ * Unit that represents the concept of a week-based-year.
+ */
+ WEEK_BASED_YEARS("WeekBasedYears", Duration.ofSeconds(31556952L)),
+ /**
+ * Unit that represents the concept of a quarter-year.
+ */
+ QUARTER_YEARS("QuarterYears", Duration.ofSeconds(31556952L / 4));
+
+ private final String name;
+ private final Duration duration;
+
+ private Unit(String name, Duration estimatedDuration) {
+ this.name = name;
+ this.duration = estimatedDuration;
+ }
+
+ @Override
+ public String getName() {
+ return name;
+ }
+
+ @Override
+ public Duration getDuration() {
+ return duration;
+ }
+
+ @Override
+ public boolean isDurationEstimated() {
+ return true;
+ }
+
+ @Override
+ public boolean isSupportedBy(Temporal temporal) {
+ return temporal.isSupported(EPOCH_DAY);
+ }
+
+ @SuppressWarnings("unchecked")
+ @Override
+ public <R extends Temporal> R addTo(R temporal, long amount) {
+ switch(this) {
+ case WEEK_BASED_YEARS:
+ return (R) temporal.with(WEEK_BASED_YEAR,
+ Math.addExact(temporal.get(WEEK_BASED_YEAR), amount));
+ case QUARTER_YEARS:
+ // no overflow (256 is multiple of 4)
+ return (R) temporal.plus(amount / 256, YEARS)
+ .plus((amount % 256) * 3, MONTHS);
+ default:
+ throw new IllegalStateException("Unreachable");
+ }
+ }
+
+ @Override
+ public long between(Temporal temporal1, Temporal temporal2) {
+ switch(this) {
+ case WEEK_BASED_YEARS:
+ return Math.subtractExact(temporal2.getLong(WEEK_BASED_YEAR),
+ temporal1.getLong(WEEK_BASED_YEAR));
+ case QUARTER_YEARS:
+ return temporal1.periodUntil(temporal2, MONTHS) / 3;
+ default:
+ throw new IllegalStateException("Unreachable");
+ }
+ }
+
+ @Override
+ public String toString() {
+ return getName();
+
+ }
+ }
+}