org.joda.time.chrono.GJChronology Maven / Gradle / Ivy
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/*
* Copyright 2001-2009 Stephen Colebourne
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.joda.time.chrono;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Locale;
import java.util.Map;
import org.joda.time.Chronology;
import org.joda.time.DateTimeField;
import org.joda.time.DateTimeUtils;
import org.joda.time.DateTimeZone;
import org.joda.time.DurationField;
import org.joda.time.IllegalFieldValueException;
import org.joda.time.Instant;
import org.joda.time.ReadableInstant;
import org.joda.time.ReadablePartial;
import org.joda.time.field.BaseDateTimeField;
import org.joda.time.field.DecoratedDurationField;
import org.joda.time.format.DateTimeFormatter;
import org.joda.time.format.ISODateTimeFormat;
/**
* Implements the Gregorian/Julian calendar system which is the calendar system
* used in most of the world. Wherever possible, it is recommended to use the
* {@link ISOChronology} instead.
*
* The Gregorian calendar replaced the Julian calendar, and the point in time
* when this chronology switches can be controlled using the second parameter
* of the getInstance method. By default this cutover is set to the date the
* Gregorian calendar was first instituted, October 15, 1582.
*
* Before this date, this chronology uses the proleptic Julian calendar
* (proleptic means extending indefinitely). The Julian calendar has leap years
* every four years, whereas the Gregorian has special rules for 100 and 400
* years. A meaningful result will thus be obtained for all input values.
* However before 8 CE, Julian leap years were irregular, and before 45 BCE
* there was no Julian calendar.
*
* This chronology differs from
* {@link java.util.GregorianCalendar GregorianCalendar} in that years
* in BCE are returned correctly. Thus year 1 BCE is returned as -1 instead of 1.
* The yearOfEra field produces results compatible with GregorianCalendar.
*
* The Julian calendar does not have a year zero, and so year -1 is followed by
* year 1. If the Gregorian cutover date is specified at or before year -1
* (Julian), year zero is defined. In other words, the proleptic Gregorian
* chronology used by this class has a year zero.
*
* To create a pure proleptic Julian chronology, use {@link JulianChronology},
* and to create a pure proleptic Gregorian chronology, use
* {@link GregorianChronology}.
*
* GJChronology is thread-safe and immutable.
*
* @author Brian S O'Neill
* @author Stephen Colebourne
* @since 1.0
*/
public final class GJChronology extends AssembledChronology {
/** Serialization lock */
private static final long serialVersionUID = -2545574827706931671L;
/**
* Convert a datetime from one chronology to another.
*/
private static long convertByYear(long instant, Chronology from, Chronology to) {
return to.getDateTimeMillis
(from.year().get(instant),
from.monthOfYear().get(instant),
from.dayOfMonth().get(instant),
from.millisOfDay().get(instant));
}
/**
* Convert a datetime from one chronology to another.
*/
private static long convertByWeekyear(final long instant, Chronology from, Chronology to) {
long newInstant;
newInstant = to.weekyear().set(0, from.weekyear().get(instant));
newInstant = to.weekOfWeekyear().set(newInstant, from.weekOfWeekyear().get(instant));
newInstant = to.dayOfWeek().set(newInstant, from.dayOfWeek().get(instant));
newInstant = to.millisOfDay().set(newInstant, from.millisOfDay().get(instant));
return newInstant;
}
/**
* The default GregorianJulian cutover point.
*/
static final Instant DEFAULT_CUTOVER = new Instant(-12219292800000L);
/** Cache of zone to chronology list */
private static final Map> cCache = new HashMap>();
/**
* Factory method returns instances of the default GJ cutover
* chronology. This uses a cutover date of October 15, 1582 (Gregorian)
* 00:00:00 UTC. For this value, October 4, 1582 (Julian) is followed by
* October 15, 1582 (Gregorian).
*
* The first day of the week is designated to be
* {@link org.joda.time.DateTimeConstants#MONDAY Monday},
* and the minimum days in the first week of the year is 4.
*
*
The time zone of the returned instance is UTC.
*/
public static GJChronology getInstanceUTC() {
return getInstance(DateTimeZone.UTC, DEFAULT_CUTOVER, 4);
}
/**
* Factory method returns instances of the default GJ cutover
* chronology. This uses a cutover date of October 15, 1582 (Gregorian)
* 00:00:00 UTC. For this value, October 4, 1582 (Julian) is followed by
* October 15, 1582 (Gregorian).
*
*
The first day of the week is designated to be
* {@link org.joda.time.DateTimeConstants#MONDAY Monday},
* and the minimum days in the first week of the year is 4.
*
*
The returned chronology is in the default time zone.
*/
public static GJChronology getInstance() {
return getInstance(DateTimeZone.getDefault(), DEFAULT_CUTOVER, 4);
}
/**
* Factory method returns instances of the GJ cutover chronology. This uses
* a cutover date of October 15, 1582 (Gregorian) 00:00:00 UTC. For this
* value, October 4, 1582 (Julian) is followed by October 15, 1582
* (Gregorian).
*
*
The first day of the week is designated to be
* {@link org.joda.time.DateTimeConstants#MONDAY Monday},
* and the minimum days in the first week of the year is 4.
*
* @param zone the time zone to use, null is default
*/
public static GJChronology getInstance(DateTimeZone zone) {
return getInstance(zone, DEFAULT_CUTOVER, 4);
}
/**
* Factory method returns instances of the GJ cutover chronology. Any
* cutover date may be specified.
*
*
The first day of the week is designated to be
* {@link org.joda.time.DateTimeConstants#MONDAY Monday},
* and the minimum days in the first week of the year is 4.
*
* @param zone the time zone to use, null is default
* @param gregorianCutover the cutover to use, null means default
*/
public static GJChronology getInstance(
DateTimeZone zone,
ReadableInstant gregorianCutover) {
return getInstance(zone, gregorianCutover, 4);
}
/**
* Factory method returns instances of the GJ cutover chronology. Any
* cutover date may be specified.
*
* @param zone the time zone to use, null is default
* @param gregorianCutover the cutover to use, null means default
* @param minDaysInFirstWeek minimum number of days in first week of the year; default is 4
*/
public static synchronized GJChronology getInstance(
DateTimeZone zone,
ReadableInstant gregorianCutover,
int minDaysInFirstWeek) {
zone = DateTimeUtils.getZone(zone);
Instant cutoverInstant;
if (gregorianCutover == null) {
cutoverInstant = DEFAULT_CUTOVER;
} else {
cutoverInstant = gregorianCutover.toInstant();
}
GJChronology chrono;
ArrayList chronos = cCache.get(zone);
if (chronos == null) {
chronos = new ArrayList(2);
cCache.put(zone, chronos);
} else {
for (int i=chronos.size(); --i>=0; ) {
chrono = chronos.get(i);
if (minDaysInFirstWeek == chrono.getMinimumDaysInFirstWeek() &&
cutoverInstant.equals(chrono.getGregorianCutover())) {
return chrono;
}
}
}
if (zone == DateTimeZone.UTC) {
chrono = new GJChronology
(JulianChronology.getInstance(zone, minDaysInFirstWeek),
GregorianChronology.getInstance(zone, minDaysInFirstWeek),
cutoverInstant);
} else {
chrono = getInstance(DateTimeZone.UTC, cutoverInstant, minDaysInFirstWeek);
chrono = new GJChronology
(ZonedChronology.getInstance(chrono, zone),
chrono.iJulianChronology,
chrono.iGregorianChronology,
chrono.iCutoverInstant);
}
chronos.add(chrono);
return chrono;
}
/**
* Factory method returns instances of the GJ cutover chronology. Any
* cutover date may be specified.
*
* @param zone the time zone to use, null is default
* @param gregorianCutover the cutover to use
* @param minDaysInFirstWeek minimum number of days in first week of the year; default is 4
*/
public static GJChronology getInstance(
DateTimeZone zone,
long gregorianCutover,
int minDaysInFirstWeek) {
Instant cutoverInstant;
if (gregorianCutover == DEFAULT_CUTOVER.getMillis()) {
cutoverInstant = null;
} else {
cutoverInstant = new Instant(gregorianCutover);
}
return getInstance(zone, cutoverInstant, minDaysInFirstWeek);
}
//-----------------------------------------------------------------------
private JulianChronology iJulianChronology;
private GregorianChronology iGregorianChronology;
private Instant iCutoverInstant;
private long iCutoverMillis;
private long iGapDuration;
/**
* @param julian chronology used before the cutover instant
* @param gregorian chronology used at and after the cutover instant
* @param cutoverInstant instant when the gregorian chronology began
*/
private GJChronology(JulianChronology julian,
GregorianChronology gregorian,
Instant cutoverInstant) {
super(null, new Object[] {julian, gregorian, cutoverInstant});
}
/**
* Called when applying a time zone.
*/
private GJChronology(Chronology base,
JulianChronology julian,
GregorianChronology gregorian,
Instant cutoverInstant) {
super(base, new Object[] {julian, gregorian, cutoverInstant});
}
/**
* Serialization singleton
*/
private Object readResolve() {
return getInstance(getZone(), iCutoverInstant, getMinimumDaysInFirstWeek());
}
public DateTimeZone getZone() {
Chronology base;
if ((base = getBase()) != null) {
return base.getZone();
}
return DateTimeZone.UTC;
}
// Conversion
//-----------------------------------------------------------------------
/**
* Gets the Chronology in the UTC time zone.
*
* @return the chronology in UTC
*/
public Chronology withUTC() {
return withZone(DateTimeZone.UTC);
}
/**
* Gets the Chronology in a specific time zone.
*
* @param zone the zone to get the chronology in, null is default
* @return the chronology
*/
public Chronology withZone(DateTimeZone zone) {
if (zone == null) {
zone = DateTimeZone.getDefault();
}
if (zone == getZone()) {
return this;
}
return getInstance(zone, iCutoverInstant, getMinimumDaysInFirstWeek());
}
public long getDateTimeMillis(int year, int monthOfYear, int dayOfMonth,
int millisOfDay)
throws IllegalArgumentException
{
Chronology base;
if ((base = getBase()) != null) {
return base.getDateTimeMillis(year, monthOfYear, dayOfMonth, millisOfDay);
}
// Assume date is Gregorian.
long instant = iGregorianChronology.getDateTimeMillis
(year, monthOfYear, dayOfMonth, millisOfDay);
if (instant < iCutoverMillis) {
// Maybe it's Julian.
instant = iJulianChronology.getDateTimeMillis
(year, monthOfYear, dayOfMonth, millisOfDay);
if (instant >= iCutoverMillis) {
// Okay, it's in the illegal cutover gap.
throw new IllegalArgumentException("Specified date does not exist");
}
}
return instant;
}
public long getDateTimeMillis(int year, int monthOfYear, int dayOfMonth,
int hourOfDay, int minuteOfHour,
int secondOfMinute, int millisOfSecond)
throws IllegalArgumentException
{
Chronology base;
if ((base = getBase()) != null) {
return base.getDateTimeMillis
(year, monthOfYear, dayOfMonth,
hourOfDay, minuteOfHour, secondOfMinute, millisOfSecond);
}
// Assume date is Gregorian.
long instant;
try {
instant = iGregorianChronology.getDateTimeMillis
(year, monthOfYear, dayOfMonth,
hourOfDay, minuteOfHour, secondOfMinute, millisOfSecond);
} catch (IllegalFieldValueException ex) {
if (monthOfYear != 2 || dayOfMonth != 29) {
throw ex;
}
instant = iGregorianChronology.getDateTimeMillis
(year, monthOfYear, 28,
hourOfDay, minuteOfHour, secondOfMinute, millisOfSecond);
if (instant >= iCutoverMillis) {
throw ex;
}
}
if (instant < iCutoverMillis) {
// Maybe it's Julian.
instant = iJulianChronology.getDateTimeMillis
(year, monthOfYear, dayOfMonth,
hourOfDay, minuteOfHour, secondOfMinute, millisOfSecond);
if (instant >= iCutoverMillis) {
// Okay, it's in the illegal cutover gap.
throw new IllegalArgumentException("Specified date does not exist");
}
}
return instant;
}
/**
* Gets the cutover instant between Gregorian and Julian chronologies.
* @return the cutover instant
*/
public Instant getGregorianCutover() {
return iCutoverInstant;
}
/**
* Gets the minimum days needed for a week to be the first week in a year.
*
* @return the minimum days
*/
public int getMinimumDaysInFirstWeek() {
return iGregorianChronology.getMinimumDaysInFirstWeek();
}
/**
* Checks if this chronology instance equals another.
*
* @param obj the object to compare to
* @return true if equal
* @since 1.6
*/
public boolean equals(Object obj) {
return super.equals(obj);
}
/**
* A suitable hash code for the chronology.
*
* @return the hash code
* @since 1.6
*/
public int hashCode() {
return "GJ".hashCode() * 11 + iJulianChronology.hashCode() +
iGregorianChronology.hashCode() + iCutoverInstant.hashCode();
}
// Output
//-----------------------------------------------------------------------
/**
* Gets a debugging toString.
*
* @return a debugging string
*/
public String toString() {
StringBuffer sb = new StringBuffer(60);
sb.append("GJChronology");
sb.append('[');
sb.append(getZone().getID());
if (iCutoverMillis != DEFAULT_CUTOVER.getMillis()) {
sb.append(",cutover=");
DateTimeFormatter printer;
if (withUTC().dayOfYear().remainder(iCutoverMillis) == 0) {
printer = ISODateTimeFormat.date();
} else {
printer = ISODateTimeFormat.dateTime();
}
printer.withChronology(withUTC()).printTo(sb, iCutoverMillis);
}
if (getMinimumDaysInFirstWeek() != 4) {
sb.append(",mdfw=");
sb.append(getMinimumDaysInFirstWeek());
}
sb.append(']');
return sb.toString();
}
protected void assemble(Fields fields) {
Object[] params = (Object[])getParam();
JulianChronology julian = (JulianChronology)params[0];
GregorianChronology gregorian = (GregorianChronology)params[1];
Instant cutoverInstant = (Instant)params[2];
iCutoverMillis = cutoverInstant.getMillis();
iJulianChronology = julian;
iGregorianChronology = gregorian;
iCutoverInstant = cutoverInstant;
if (getBase() != null) {
return;
}
if (julian.getMinimumDaysInFirstWeek() != gregorian.getMinimumDaysInFirstWeek()) {
throw new IllegalArgumentException();
}
// Compute difference between the chronologies at the cutover instant
iGapDuration = iCutoverMillis - julianToGregorianByYear(iCutoverMillis);
// Begin field definitions.
// First just copy all the Gregorian fields and then override those
// that need special attention.
fields.copyFieldsFrom(gregorian);
// Assuming cutover is at midnight, all time of day fields can be
// gregorian since they are unaffected by cutover.
// Verify assumption.
if (gregorian.millisOfDay().get(iCutoverMillis) == 0) {
// Cutover is sometime in the day, so cutover fields are required
// for time of day.
fields.millisOfSecond = new CutoverField(julian.millisOfSecond(), fields.millisOfSecond, iCutoverMillis);
fields.millisOfDay = new CutoverField(julian.millisOfDay(), fields.millisOfDay, iCutoverMillis);
fields.secondOfMinute = new CutoverField(julian.secondOfMinute(), fields.secondOfMinute, iCutoverMillis);
fields.secondOfDay = new CutoverField(julian.secondOfDay(), fields.secondOfDay, iCutoverMillis);
fields.minuteOfHour = new CutoverField(julian.minuteOfHour(), fields.minuteOfHour, iCutoverMillis);
fields.minuteOfDay = new CutoverField(julian.minuteOfDay(), fields.minuteOfDay, iCutoverMillis);
fields.hourOfDay = new CutoverField(julian.hourOfDay(), fields.hourOfDay, iCutoverMillis);
fields.hourOfHalfday = new CutoverField(julian.hourOfHalfday(), fields.hourOfHalfday, iCutoverMillis);
fields.clockhourOfDay = new CutoverField(julian.clockhourOfDay(), fields.clockhourOfDay, iCutoverMillis);
fields.clockhourOfHalfday = new CutoverField(julian.clockhourOfHalfday(),
fields.clockhourOfHalfday, iCutoverMillis);
fields.halfdayOfDay = new CutoverField(julian.halfdayOfDay(), fields.halfdayOfDay, iCutoverMillis);
}
// These fields just require basic cutover support.
{
fields.era = new CutoverField(julian.era(), fields.era, iCutoverMillis);
}
// DayOfYear and weekOfWeekyear require special handling since cutover
// year has fewer days and weeks. Extend the cutover to the start of
// the next year or weekyear. This keeps the sequence unbroken during
// the cutover year.
{
long cutover = gregorian.year().roundCeiling(iCutoverMillis);
fields.dayOfYear = new CutoverField(
julian.dayOfYear(), fields.dayOfYear, cutover);
}
{
long cutover = gregorian.weekyear().roundCeiling(iCutoverMillis);
fields.weekOfWeekyear = new CutoverField(
julian.weekOfWeekyear(), fields.weekOfWeekyear, cutover, true);
}
// These fields are special because they have imprecise durations. The
// family of addition methods need special attention. Override affected
// duration fields as well.
{
fields.year = new ImpreciseCutoverField(
julian.year(), fields.year, iCutoverMillis);
fields.years = fields.year.getDurationField();
fields.yearOfEra = new ImpreciseCutoverField(
julian.yearOfEra(), fields.yearOfEra, fields.years, iCutoverMillis);
fields.yearOfCentury = new ImpreciseCutoverField(
julian.yearOfCentury(), fields.yearOfCentury, fields.years, iCutoverMillis);
fields.centuryOfEra = new ImpreciseCutoverField(
julian.centuryOfEra(), fields.centuryOfEra, iCutoverMillis);
fields.centuries = fields.centuryOfEra.getDurationField();
fields.monthOfYear = new ImpreciseCutoverField(
julian.monthOfYear(), fields.monthOfYear, iCutoverMillis);
fields.months = fields.monthOfYear.getDurationField();
fields.weekyear = new ImpreciseCutoverField(
julian.weekyear(), fields.weekyear, null, iCutoverMillis, true);
fields.weekyearOfCentury = new ImpreciseCutoverField(
julian.weekyearOfCentury(), fields.weekyearOfCentury, fields.weekyears, iCutoverMillis);
fields.weekyears = fields.weekyear.getDurationField();
}
// These fields require basic cutover support, except they must link to
// imprecise durations.
{
CutoverField cf = new CutoverField
(julian.dayOfMonth(), fields.dayOfMonth, iCutoverMillis);
cf.iRangeDurationField = fields.months;
fields.dayOfMonth = cf;
}
}
long julianToGregorianByYear(long instant) {
return convertByYear(instant, iJulianChronology, iGregorianChronology);
}
long gregorianToJulianByYear(long instant) {
return convertByYear(instant, iGregorianChronology, iJulianChronology);
}
long julianToGregorianByWeekyear(long instant) {
return convertByWeekyear(instant, iJulianChronology, iGregorianChronology);
}
long gregorianToJulianByWeekyear(long instant) {
return convertByWeekyear(instant, iGregorianChronology, iJulianChronology);
}
//-----------------------------------------------------------------------
/**
* This basic cutover field adjusts calls to 'get' and 'set' methods, and
* assumes that calls to add and addWrapField are unaffected by the cutover.
*/
private class CutoverField extends BaseDateTimeField {
private static final long serialVersionUID = 3528501219481026402L;
final DateTimeField iJulianField;
final DateTimeField iGregorianField;
final long iCutover;
final boolean iConvertByWeekyear;
protected DurationField iDurationField;
protected DurationField iRangeDurationField;
/**
* @param julianField field from the chronology used before the cutover instant
* @param gregorianField field from the chronology used at and after the cutover
* @param cutoverMillis the millis of the cutover
*/
CutoverField(DateTimeField julianField, DateTimeField gregorianField, long cutoverMillis) {
this(julianField, gregorianField, cutoverMillis, false);
}
/**
* @param julianField field from the chronology used before the cutover instant
* @param gregorianField field from the chronology used at and after the cutover
* @param cutoverMillis the millis of the cutover
* @param convertByWeekyear
*/
CutoverField(DateTimeField julianField, DateTimeField gregorianField,
long cutoverMillis, boolean convertByWeekyear) {
super(gregorianField.getType());
iJulianField = julianField;
iGregorianField = gregorianField;
iCutover = cutoverMillis;
iConvertByWeekyear = convertByWeekyear;
// Although average length of Julian and Gregorian years differ,
// use the Gregorian duration field because it is more accurate.
iDurationField = gregorianField.getDurationField();
DurationField rangeField = gregorianField.getRangeDurationField();
if (rangeField == null) {
rangeField = julianField.getRangeDurationField();
}
iRangeDurationField = rangeField;
}
public boolean isLenient() {
return false;
}
public int get(long instant) {
if (instant >= iCutover) {
return iGregorianField.get(instant);
} else {
return iJulianField.get(instant);
}
}
public String getAsText(long instant, Locale locale) {
if (instant >= iCutover) {
return iGregorianField.getAsText(instant, locale);
} else {
return iJulianField.getAsText(instant, locale);
}
}
public String getAsText(int fieldValue, Locale locale) {
return iGregorianField.getAsText(fieldValue, locale);
}
public String getAsShortText(long instant, Locale locale) {
if (instant >= iCutover) {
return iGregorianField.getAsShortText(instant, locale);
} else {
return iJulianField.getAsShortText(instant, locale);
}
}
public String getAsShortText(int fieldValue, Locale locale) {
return iGregorianField.getAsShortText(fieldValue, locale);
}
public long add(long instant, int value) {
return iGregorianField.add(instant, value);
}
public long add(long instant, long value) {
return iGregorianField.add(instant, value);
}
public int[] add(ReadablePartial partial, int fieldIndex, int[] values, int valueToAdd) {
// overridden as superclass algorithm can't handle
// 2004-02-29 + 48 months -> 2008-02-29 type dates
if (valueToAdd == 0) {
return values;
}
if (DateTimeUtils.isContiguous(partial)) {
long instant = 0L;
for (int i = 0, isize = partial.size(); i < isize; i++) {
instant = partial.getFieldType(i).getField(GJChronology.this).set(instant, values[i]);
}
instant = add(instant, valueToAdd);
return GJChronology.this.get(partial, instant);
} else {
return super.add(partial, fieldIndex, values, valueToAdd);
}
}
public int getDifference(long minuendInstant, long subtrahendInstant) {
return iGregorianField.getDifference(minuendInstant, subtrahendInstant);
}
public long getDifferenceAsLong(long minuendInstant, long subtrahendInstant) {
return iGregorianField.getDifferenceAsLong(minuendInstant, subtrahendInstant);
}
public long set(long instant, int value) {
if (instant >= iCutover) {
instant = iGregorianField.set(instant, value);
if (instant < iCutover) {
// Only adjust if gap fully crossed.
if (instant + iGapDuration < iCutover) {
instant = gregorianToJulian(instant);
}
// Verify that new value stuck.
if (get(instant) != value) {
throw new IllegalFieldValueException
(iGregorianField.getType(), Integer.valueOf(value), null, null);
}
}
} else {
instant = iJulianField.set(instant, value);
if (instant >= iCutover) {
// Only adjust if gap fully crossed.
if (instant - iGapDuration >= iCutover) {
instant = julianToGregorian(instant);
}
// Verify that new value stuck.
if (get(instant) != value) {
throw new IllegalFieldValueException
(iJulianField.getType(), Integer.valueOf(value), null, null);
}
}
}
return instant;
}
public long set(long instant, String text, Locale locale) {
if (instant >= iCutover) {
instant = iGregorianField.set(instant, text, locale);
if (instant < iCutover) {
// Only adjust if gap fully crossed.
if (instant + iGapDuration < iCutover) {
instant = gregorianToJulian(instant);
}
// Cannot verify that new value stuck because set may be lenient.
}
} else {
instant = iJulianField.set(instant, text, locale);
if (instant >= iCutover) {
// Only adjust if gap fully crossed.
if (instant - iGapDuration >= iCutover) {
instant = julianToGregorian(instant);
}
// Cannot verify that new value stuck because set may be lenient.
}
}
return instant;
}
public DurationField getDurationField() {
return iDurationField;
}
public DurationField getRangeDurationField() {
return iRangeDurationField;
}
public boolean isLeap(long instant) {
if (instant >= iCutover) {
return iGregorianField.isLeap(instant);
} else {
return iJulianField.isLeap(instant);
}
}
public int getLeapAmount(long instant) {
if (instant >= iCutover) {
return iGregorianField.getLeapAmount(instant);
} else {
return iJulianField.getLeapAmount(instant);
}
}
public DurationField getLeapDurationField() {
return iGregorianField.getLeapDurationField();
}
public int getMinimumValue() {
// For all precise fields, the Julian and Gregorian limits are
// identical. Choose Julian to tighten up the year limits.
return iJulianField.getMinimumValue();
}
public int getMinimumValue(ReadablePartial partial) {
return iJulianField.getMinimumValue(partial);
}
public int getMinimumValue(ReadablePartial partial, int[] values) {
return iJulianField.getMinimumValue(partial, values);
}
public int getMinimumValue(long instant) {
if (instant < iCutover) {
return iJulianField.getMinimumValue(instant);
}
int min = iGregorianField.getMinimumValue(instant);
// Because the cutover may reduce the length of this field, verify
// the minimum by setting it.
instant = iGregorianField.set(instant, min);
if (instant < iCutover) {
min = iGregorianField.get(iCutover);
}
return min;
}
public int getMaximumValue() {
// For all precise fields, the Julian and Gregorian limits are
// identical.
return iGregorianField.getMaximumValue();
}
public int getMaximumValue(long instant) {
if (instant >= iCutover) {
return iGregorianField.getMaximumValue(instant);
}
int max = iJulianField.getMaximumValue(instant);
// Because the cutover may reduce the length of this field, verify
// the maximum by setting it.
instant = iJulianField.set(instant, max);
if (instant >= iCutover) {
max = iJulianField.get(iJulianField.add(iCutover, -1));
}
return max;
}
public int getMaximumValue(ReadablePartial partial) {
long instant = GJChronology.getInstanceUTC().set(partial, 0L);
return getMaximumValue(instant);
}
public int getMaximumValue(ReadablePartial partial, int[] values) {
Chronology chrono = GJChronology.getInstanceUTC();
long instant = 0L;
for (int i = 0, isize = partial.size(); i < isize; i++) {
DateTimeField field = partial.getFieldType(i).getField(chrono);
if (values[i] <= field.getMaximumValue(instant)) {
instant = field.set(instant, values[i]);
}
}
return getMaximumValue(instant);
}
public long roundFloor(long instant) {
if (instant >= iCutover) {
instant = iGregorianField.roundFloor(instant);
if (instant < iCutover) {
// Only adjust if gap fully crossed.
if (instant + iGapDuration < iCutover) {
instant = gregorianToJulian(instant);
}
}
} else {
instant = iJulianField.roundFloor(instant);
}
return instant;
}
public long roundCeiling(long instant) {
if (instant >= iCutover) {
instant = iGregorianField.roundCeiling(instant);
} else {
instant = iJulianField.roundCeiling(instant);
if (instant >= iCutover) {
// Only adjust if gap fully crossed.
if (instant - iGapDuration >= iCutover) {
instant = julianToGregorian(instant);
}
}
}
return instant;
}
public int getMaximumTextLength(Locale locale) {
return Math.max(iJulianField.getMaximumTextLength(locale),
iGregorianField.getMaximumTextLength(locale));
}
public int getMaximumShortTextLength(Locale locale) {
return Math.max(iJulianField.getMaximumShortTextLength(locale),
iGregorianField.getMaximumShortTextLength(locale));
}
protected long julianToGregorian(long instant) {
if (iConvertByWeekyear) {
return julianToGregorianByWeekyear(instant);
} else {
return julianToGregorianByYear(instant);
}
}
protected long gregorianToJulian(long instant) {
if (iConvertByWeekyear) {
return gregorianToJulianByWeekyear(instant);
} else {
return gregorianToJulianByYear(instant);
}
}
}
//-----------------------------------------------------------------------
/**
* Cutover field for variable length fields. These fields internally call
* set whenever add is called. As a result, the same correction applied to
* set must be applied to add and addWrapField. Knowing when to use this
* field requires specific knowledge of how the GJ fields are implemented.
*/
private final class ImpreciseCutoverField extends CutoverField {
private static final long serialVersionUID = 3410248757173576441L;
/**
* Creates a duration field that links back to this.
*/
ImpreciseCutoverField(DateTimeField julianField, DateTimeField gregorianField, long cutoverMillis) {
this(julianField, gregorianField, null, cutoverMillis, false);
}
/**
* Uses a shared duration field rather than creating a new one.
*
* @param durationField shared duration field
*/
ImpreciseCutoverField(DateTimeField julianField, DateTimeField gregorianField,
DurationField durationField, long cutoverMillis)
{
this(julianField, gregorianField, durationField, cutoverMillis, false);
}
/**
* Uses a shared duration field rather than creating a new one.
*
* @param durationField shared duration field
*/
ImpreciseCutoverField(DateTimeField julianField, DateTimeField gregorianField,
DurationField durationField,
long cutoverMillis, boolean convertByWeekyear)
{
super(julianField, gregorianField, cutoverMillis, convertByWeekyear);
if (durationField == null) {
durationField = new LinkedDurationField(iDurationField, this);
}
iDurationField = durationField;
}
public long add(long instant, int value) {
if (instant >= iCutover) {
instant = iGregorianField.add(instant, value);
if (instant < iCutover) {
// Only adjust if gap fully crossed.
if (instant + iGapDuration < iCutover) {
instant = gregorianToJulian(instant);
}
}
} else {
instant = iJulianField.add(instant, value);
if (instant >= iCutover) {
// Only adjust if gap fully crossed.
if (instant - iGapDuration >= iCutover) {
instant = julianToGregorian(instant);
}
}
}
return instant;
}
public long add(long instant, long value) {
if (instant >= iCutover) {
instant = iGregorianField.add(instant, value);
if (instant < iCutover) {
// Only adjust if gap fully crossed.
if (instant + iGapDuration < iCutover) {
instant = gregorianToJulian(instant);
}
}
} else {
instant = iJulianField.add(instant, value);
if (instant >= iCutover) {
// Only adjust if gap fully crossed.
if (instant - iGapDuration >= iCutover) {
instant = julianToGregorian(instant);
}
}
}
return instant;
}
public int getDifference(long minuendInstant, long subtrahendInstant) {
if (minuendInstant >= iCutover) {
if (subtrahendInstant >= iCutover) {
return iGregorianField.getDifference(minuendInstant, subtrahendInstant);
}
// Remember, the add is being reversed. Since subtrahend is
// Julian, convert minuend to Julian to match.
minuendInstant = gregorianToJulian(minuendInstant);
return iJulianField.getDifference(minuendInstant, subtrahendInstant);
} else {
if (subtrahendInstant < iCutover) {
return iJulianField.getDifference(minuendInstant, subtrahendInstant);
}
// Remember, the add is being reversed. Since subtrahend is
// Gregorian, convert minuend to Gregorian to match.
minuendInstant = julianToGregorian(minuendInstant);
return iGregorianField.getDifference(minuendInstant, subtrahendInstant);
}
}
public long getDifferenceAsLong(long minuendInstant, long subtrahendInstant) {
if (minuendInstant >= iCutover) {
if (subtrahendInstant >= iCutover) {
return iGregorianField.getDifferenceAsLong(minuendInstant, subtrahendInstant);
}
// Remember, the add is being reversed. Since subtrahend is
// Julian, convert minuend to Julian to match.
minuendInstant = gregorianToJulian(minuendInstant);
return iJulianField.getDifferenceAsLong(minuendInstant, subtrahendInstant);
} else {
if (subtrahendInstant < iCutover) {
return iJulianField.getDifferenceAsLong(minuendInstant, subtrahendInstant);
}
// Remember, the add is being reversed. Since subtrahend is
// Gregorian, convert minuend to Gregorian to match.
minuendInstant = julianToGregorian(minuendInstant);
return iGregorianField.getDifferenceAsLong(minuendInstant, subtrahendInstant);
}
}
// Since the imprecise fields have durations longer than the gap
// duration, keep these methods simple. The inherited implementations
// produce incorrect results.
//
// Degenerate case: If this field is a month, and the cutover is set
// far into the future, then the gap duration may be so large as to
// reduce the number of months in a year. If the missing month(s) are
// at the beginning or end of the year, then the minimum and maximum
// values are not 1 and 12. I don't expect this case to ever occur.
public int getMinimumValue(long instant) {
if (instant >= iCutover) {
return iGregorianField.getMinimumValue(instant);
} else {
return iJulianField.getMinimumValue(instant);
}
}
public int getMaximumValue(long instant) {
if (instant >= iCutover) {
return iGregorianField.getMaximumValue(instant);
} else {
return iJulianField.getMaximumValue(instant);
}
}
}
//-----------------------------------------------------------------------
/**
* Links the duration back to a ImpreciseCutoverField.
*/
private static class LinkedDurationField extends DecoratedDurationField {
private static final long serialVersionUID = 4097975388007713084L;
private final ImpreciseCutoverField iField;
LinkedDurationField(DurationField durationField, ImpreciseCutoverField dateTimeField) {
super(durationField, durationField.getType());
iField = dateTimeField;
}
public long add(long instant, int value) {
return iField.add(instant, value);
}
public long add(long instant, long value) {
return iField.add(instant, value);
}
public int getDifference(long minuendInstant, long subtrahendInstant) {
return iField.getDifference(minuendInstant, subtrahendInstant);
}
public long getDifferenceAsLong(long minuendInstant, long subtrahendInstant) {
return iField.getDifferenceAsLong(minuendInstant, subtrahendInstant);
}
}
}