Java examples | IsoFields.java - override, string, temporalunit, unsupportedtemporaltypeexception, valuerange

* <tr> * <tr> * <tr> * <tr> * <tr> * <tr> * </table> * * @implSpec * * This class is immutable and thread-safe. * * @since 1.8 */ public final class IsoFields { /** * The field that represents the day-of-quarter. * * 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. * * The day-of-quarter can only be calculated if the day-of-year, month-of-year and year * are available. * * 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. * * In the resolving phase of parsing, a date can be created from a year, * quarter-of-year and day-of-quarter. * * In {@linkplain ResolverStyle#STRICT strict mode}, all three fields are * validated against their range of valid values. The day-of-quarter field * is validated from 1 to 90, 91 or 92 depending on the year and quarter. * * In {@linkplain ResolverStyle#SMART smart mode}, all three fields are * validated against their range of valid values. The day-of-quarter field is * validated between 1 and 92, ignoring the actual range based on the year and quarter. * If the day-of-quarter exceeds the actual range by one day, then the resulting date * is one day later. If the day-of-quarter exceeds the actual range by two days, * then the resulting date is two days later. * * In {@linkplain ResolverStyle#LENIENT lenient mode}, only the year is 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 of January * in the requested year. Then take the quarter-of-year, subtract one, and add the * amount in quarters to the date. Finally, take the day-of-quarter, subtract one, * and add the amount in days to the date. * * 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. * * This field allows the quarter-of-year value to be queried and set. * The quarter-of-year has values from 1 to 4. * * The quarter-of-year can only be calculated if the month-of-year is available. * * In the resolving phase of parsing, a date can be created from a year, * quarter-of-year and day-of-quarter. * See {@link #DAY_OF_QUARTER} for details. * * 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. * * This field allows the week of the week-based-year value to be queried and set. * The week-of-week-based-year has values from 1 to 52, or 53 if the * week-based-year has 53 weeks. * * In the resolving phase of parsing, a date can be created from a * week-based-year, week-of-week-based-year and day-of-week. * * In {@linkplain ResolverStyle#STRICT strict mode}, all three fields are * validated against their range of valid values. The week-of-week-based-year * field is validated from 1 to 52 or 53 depending on the week-based-year. * * 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 between 1 and 53, ignoring the week-based-year. * If the week-of-week-based-year is 53, but the week-based-year only has * 52 weeks, then the resulting date is in week 1 of the following week-based-year. * * In {@linkplain ResolverStyle#LENIENT lenient mode}, only the week-based-year * is validated against the range of valid values. If the day-of-week is outside * the range 1 to 7, then the resulting date is adjusted by a suitable number of * weeks to reduce the day-of-week to the range 1 to 7. If the week-of-week-based-year * value is outside the range 1 to 52, then any excess weeks are added or subtracted * from the resulting date. * * 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. * * This field allows the week-based-year value to be queried and set. * * The field has a range that matches {@link LocalDate#MAX} and {@link LocalDate#MIN}. * * In the resolving phase of parsing, a date can be created from a * week-based-year, week-of-week-based-year and day-of-week. * See {@link #WEEK_OF_WEEK_BASED_YEAR} for details. * * 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. * * 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}. * * 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. * * 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}. * * 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 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 UnsupportedTemporalTypeException("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 UnsupportedTemporalTypeException("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 ChronoLocalDate resolve( Map<TemporalField, Long> fieldValues, TemporalAccessor partialTemporal, ResolverStyle resolverStyle) { Long yearLong = fieldValues.get(YEAR); Long qoyLong = fieldValues.get(QUARTER_OF_YEAR); if (yearLong == null || qoyLong == null) { return null; } int y = YEAR.checkValidIntValue(yearLong); // always validate long doq = fieldValues.get(DAY_OF_QUARTER); ensureIso(partialTemporal); LocalDate date; if (resolverStyle == ResolverStyle.LENIENT) { date = LocalDate.of(y, 1, 1).plusMonths(Math.multiplyExact(Math.subtractExact(qoyLong, 1), 3)); doq = Math.subtractExact(doq, 1); } else { int qoy = QUARTER_OF_YEAR.range().checkValidIntValue(qoyLong, QUARTER_OF_YEAR); // validated date = LocalDate.of(y, ((qoy - 1) * 3) + 1, 1); if (doq < 1 || doq > 90) { if (resolverStyle == ResolverStyle.STRICT) { rangeRefinedBy(date).checkValidValue(doq, this); // only allow exact range } else { // SMART range().checkValidValue(doq, this); // allow 1-92 rolling into next quarter } } doq--; } fieldValues.remove(this); fieldValues.remove(YEAR); fieldValues.remove(QUARTER_OF_YEAR); return date.plusDays(doq); } @Override public String toString() { return "DayOfQuarter"; } }, QUARTER_OF_YEAR { @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 UnsupportedTemporalTypeException("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); } @Override public String toString() { return "QuarterOfYear"; } }, WEEK_OF_WEEK_BASED_YEAR { @Override public String getDisplayName(Locale locale) { Objects.requireNonNull(locale, "locale"); LocaleResources lr = LocaleProviderAdapter.getResourceBundleBased() .getLocaleResources(locale); ResourceBundle rb = lr.getJavaTimeFormatData(); return rb.containsKey("field.week") ? rb.getString("field.week") : toString(); } @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 UnsupportedTemporalTypeException("Unsupported field: WeekOfWeekBasedYear"); } return getWeekRange(LocalDate.from(temporal)); } @Override public long getFrom(TemporalAccessor temporal) { if (isSupportedBy(temporal) == false) { throw new UnsupportedTemporalTypeException("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 ChronoLocalDate resolve( Map<TemporalField, Long> fieldValues, TemporalAccessor partialTemporal, ResolverStyle resolverStyle) { Long wbyLong = fieldValues.get(WEEK_BASED_YEAR); Long dowLong = fieldValues.get(DAY_OF_WEEK); if (wbyLong == null || dowLong == null) { return null; } int wby = WEEK_BASED_YEAR.range().checkValidIntValue(wbyLong, WEEK_BASED_YEAR); // always validate long wowby = fieldValues.get(WEEK_OF_WEEK_BASED_YEAR); ensureIso(partialTemporal); LocalDate date = LocalDate.of(wby, 1, 4); if (resolverStyle == ResolverStyle.LENIENT) { long dow = dowLong; // unvalidated if (dow > 7) { date = date.plusWeeks((dow - 1) / 7); dow = ((dow - 1) % 7) + 1; } else if (dow < 1) { date = date.plusWeeks(Math.subtractExact(dow, 7) / 7); dow = ((dow + 6) % 7) + 1; } date = date.plusWeeks(Math.subtractExact(wowby, 1)).with(DAY_OF_WEEK, dow); } else { int dow = DAY_OF_WEEK.checkValidIntValue(dowLong); // validated if (wowby < 1 || wowby > 52) { if (resolverStyle == ResolverStyle.STRICT) { getWeekRange(date).checkValidValue(wowby, this); // only allow exact range } else { // SMART range().checkValidValue(wowby, this); // allow 1-53 rolling into next year } } date = date.plusWeeks(wowby - 1).with(DAY_OF_WEEK, dow); } fieldValues.remove(this); fieldValues.remove(WEEK_BASED_YEAR); fieldValues.remove(DAY_OF_WEEK); return date; } @Override public String toString() { return "WeekOfWeekBasedYear"; } }, WEEK_BASED_YEAR { @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 UnsupportedTemporalTypeException("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 UnsupportedTemporalTypeException("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 String toString() { return "WeekBasedYear"; } }; @Override public boolean isDateBased() { return true; } @Override public boolean isTimeBased() { return false; } @Override public ValueRange rangeRefinedBy(TemporalAccessor temporal) { return range(); } //------------------------------------------------------------------------- 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 void ensureIso(TemporalAccessor temporal) { if (isIso(temporal) == false) { throw new DateTimeException("Resolve requires IsoChronology"); } } 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 Duration getDuration() { return duration; } @Override public boolean isDurationEstimated() { return true; } @Override public boolean isDateBased() { return true; } @Override public boolean isTimeBased() { return false; } @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 temporal1Inclusive, Temporal temporal2Exclusive) { if (temporal1Inclusive.getClass() != temporal2Exclusive.getClass()) { return temporal1Inclusive.until(temporal2Exclusive, this); } switch(this) { case WEEK_BASED_YEARS: return Math.subtractExact(temporal2Exclusive.getLong(WEEK_BASED_YEAR), temporal1Inclusive.getLong(WEEK_BASED_YEAR)); case QUARTER_YEARS: return temporal1Inclusive.until(temporal2Exclusive, MONTHS) / 3; default: throw new IllegalStateException("Unreachable"); } } @Override public String toString() { return name; } } }

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	Java example source code file (IsoFields.java) This example Java source code file (IsoFields.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM. Learn more about this Java project at its project page. Java - Java tags/keywords duration, localdate, long, override, quarter_years, string, suppresswarnings, temporalfield, temporalunit, unsupportedtemporaltypeexception, util, valuerange, week_based_years, weekbasedyear The IsoFields.java Java example source code /* * 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.ChronoLocalDate; import java.time.chrono.Chronology; import java.time.chrono.IsoChronology; import java.time.format.ResolverStyle; import java.util.Locale; import java.util.Map; import java.util.Objects; import java.util.ResourceBundle; import sun.util.locale.provider.LocaleProviderAdapter; import sun.util.locale.provider.LocaleResources; /* * 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 * 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: * <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> * * <h3>Week based years * 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: * <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> * 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. * <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> * There are 52 weeks in most week-based years, however on occasion there are 53 weeks. * <p> * For example: * * <table cellpadding="0" cellspacing="3" border="0" style="text-align: left; width: 50%;"> * <caption>Examples of Week based Years * <tr>	Date	Day-of-week	Field values
2008-12-28	Sunday	Week 52 of week-based-year 2008
2008-12-29	Monday	Week 1 of week-based-year 2009
2008-12-31	Wednesday	Week 1 of week-based-year 2009
2009-01-01	Thursday	Week 1 of week-based-year 2009
2009-01-04	Sunday	Week 1 of week-based-year 2009
2009-01-05	Monday	Week 2 of week-based-year 2009

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